diff --git a/bypy/init_env.py b/bypy/init_env.py
index 4f0588bfe3..bd5c6d223c 100644
--- a/bypy/init_env.py
+++ b/bypy/init_env.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import print_function
+
 
 import json
 import os
diff --git a/bypy/linux/__main__.py b/bypy/linux/__main__.py
index f4e928dc87..4b411e4a6d 100644
--- a/bypy/linux/__main__.py
+++ b/bypy/linux/__main__.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import print_function
+
 
 import errno
 import glob
diff --git a/bypy/macos/__main__.py b/bypy/macos/__main__.py
index 4e8496de2e..4f8b621b5d 100644
--- a/bypy/macos/__main__.py
+++ b/bypy/macos/__main__.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import glob
diff --git a/bypy/windows/__main__.py b/bypy/windows/__main__.py
index 7d4fe06ac3..e0032c8670 100644
--- a/bypy/windows/__main__.py
+++ b/bypy/windows/__main__.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import glob
diff --git a/icons/icns/make_iconsets.py b/icons/icns/make_iconsets.py
index fa4153e424..b81705865e 100644
--- a/icons/icns/make_iconsets.py
+++ b/icons/icns/make_iconsets.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/icons/make_ico_files.py b/icons/make_ico_files.py
index e50d5368bf..23378e7d6f 100644
--- a/icons/make_ico_files.py
+++ b/icons/make_ico_files.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/imgsrc/generate.py b/imgsrc/generate.py
index 898772e25a..c0d41a639d 100755
--- a/imgsrc/generate.py
+++ b/imgsrc/generate.py
@@ -2,7 +2,6 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
 import os, glob, subprocess, argparse, json, hashlib
 
 duplicates = {
diff --git a/imgsrc/render-logo.py b/imgsrc/render-logo.py
index 3ad02cdb1e..806aa6cf5e 100755
--- a/imgsrc/render-logo.py
+++ b/imgsrc/render-logo.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import os, subprocess, sys, shutil
 
 j = os.path.join
diff --git a/imgsrc/srv/generate.py b/imgsrc/srv/generate.py
index 6d480d4804..bc043fb432 100644
--- a/imgsrc/srv/generate.py
+++ b/imgsrc/srv/generate.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import os, re, sys
 
 from lxml import etree
diff --git a/manual/build.py b/manual/build.py
index 7d0a41cd46..76924420ac 100755
--- a/manual/build.py
+++ b/manual/build.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/manual/custom.py b/manual/custom.py
index c9a0307deb..2170166ca3 100644
--- a/manual/custom.py
+++ b/manual/custom.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
-from __future__ import print_function
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 import os, re, textwrap
diff --git a/manual/epub.py b/manual/epub.py
index 24f28c85b5..8a6ca38e2e 100644
--- a/manual/epub.py
+++ b/manual/epub.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/manual/latex.py b/manual/latex.py
index 58f187c1f5..3ff1a66b80 100644
--- a/manual/latex.py
+++ b/manual/latex.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/manual/plugin_examples/editor_demo/__init__.py b/manual/plugin_examples/editor_demo/__init__.py
index 90a14601ee..a6c63eadf0 100644
--- a/manual/plugin_examples/editor_demo/__init__.py
+++ b/manual/plugin_examples/editor_demo/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/manual/plugin_examples/editor_demo/main.py b/manual/plugin_examples/editor_demo/main.py
index 9cccf34ed9..a354d35695 100644
--- a/manual/plugin_examples/editor_demo/main.py
+++ b/manual/plugin_examples/editor_demo/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/manual/plugin_examples/helloworld/__init__.py b/manual/plugin_examples/helloworld/__init__.py
index 1306ac8fdd..c075e106ad 100644
--- a/manual/plugin_examples/helloworld/__init__.py
+++ b/manual/plugin_examples/helloworld/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/manual/plugin_examples/interface_demo/__init__.py b/manual/plugin_examples/interface_demo/__init__.py
index d992200658..1aa5d4fbf2 100644
--- a/manual/plugin_examples/interface_demo/__init__.py
+++ b/manual/plugin_examples/interface_demo/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/manual/plugin_examples/interface_demo/config.py b/manual/plugin_examples/interface_demo/config.py
index a9e784c61a..80b6769c53 100644
--- a/manual/plugin_examples/interface_demo/config.py
+++ b/manual/plugin_examples/interface_demo/config.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/manual/plugin_examples/interface_demo/main.py b/manual/plugin_examples/interface_demo/main.py
index f8446b7c21..ad218f4e3a 100644
--- a/manual/plugin_examples/interface_demo/main.py
+++ b/manual/plugin_examples/interface_demo/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/manual/plugin_examples/interface_demo/ui.py b/manual/plugin_examples/interface_demo/ui.py
index 77f4944515..53b2c63820 100644
--- a/manual/plugin_examples/interface_demo/ui.py
+++ b/manual/plugin_examples/interface_demo/ui.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/manual/plugin_examples/webengine_demo/__init__.py b/manual/plugin_examples/webengine_demo/__init__.py
index 370bf626e8..1270276351 100644
--- a/manual/plugin_examples/webengine_demo/__init__.py
+++ b/manual/plugin_examples/webengine_demo/__init__.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 # The class that all Interface Action plugin wrappers must inherit from
diff --git a/manual/plugin_examples/webengine_demo/main.py b/manual/plugin_examples/webengine_demo/main.py
index a0ea96fe63..42fe1faad7 100644
--- a/manual/plugin_examples/webengine_demo/main.py
+++ b/manual/plugin_examples/webengine_demo/main.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import QUrl
 from PyQt5.QtWebEngineWidgets import QWebEngineView
diff --git a/manual/plugin_examples/webengine_demo/ui.py b/manual/plugin_examples/webengine_demo/ui.py
index 6f5dd9b83e..fcfe14ac88 100644
--- a/manual/plugin_examples/webengine_demo/ui.py
+++ b/manual/plugin_examples/webengine_demo/ui.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 if False:
diff --git a/manual/template_ref_generate.py b/manual/template_ref_generate.py
index e342bdb6e3..6ce7138991 100644
--- a/manual/template_ref_generate.py
+++ b/manual/template_ref_generate.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import print_function
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/resources/default_tweaks.py b/resources/default_tweaks.py
index d3232c4b31..abdb971a36 100644
--- a/resources/default_tweaks.py
+++ b/resources/default_tweaks.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import unicode_literals
+
 
 # Contains various tweaks that affect calibre behavior. Only edit this file if
 # you know what you are doing. If you delete this file, it will be recreated from
diff --git a/setup.py b/setup.py
index 64f52484ba..bfcbc49d2c 100755
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import print_function
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/__init__.py b/setup/__init__.py
index d1c1a0c854..9b12fb5d95 100644
--- a/setup/__init__.py
+++ b/setup/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement, print_function
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/browser_data.py b/setup/browser_data.py
index b8ea77b941..6882649511 100644
--- a/setup/browser_data.py
+++ b/setup/browser_data.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import json
diff --git a/setup/build.py b/setup/build.py
index adf173bb53..8dd1f15726 100644
--- a/setup/build.py
+++ b/setup/build.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement
-from __future__ import print_function
+
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/build_environment.py b/setup/build_environment.py
index b4dacb013f..b5bfee12a1 100644
--- a/setup/build_environment.py
+++ b/setup/build_environment.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement, print_function
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/check.py b/setup/check.py
index b6635a3403..86b98bf8a8 100644
--- a/setup/check.py
+++ b/setup/check.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/commands.py b/setup/commands.py
index a95c6403e6..d9e741e937 100644
--- a/setup/commands.py
+++ b/setup/commands.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/file-hosting-bw.py b/setup/file-hosting-bw.py
index 75238b246b..c6a7a34304 100644
--- a/setup/file-hosting-bw.py
+++ b/setup/file-hosting-bw.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/setup/git_pre_commit_hook.py b/setup/git_pre_commit_hook.py
index 99113de762..cdcfe1f633 100755
--- a/setup/git_pre_commit_hook.py
+++ b/setup/git_pre_commit_hook.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import print_function
+
 
 import importlib
 import json
diff --git a/setup/git_version.py b/setup/git_version.py
index c8f1ead1c3..787bfd5bee 100755
--- a/setup/git_version.py
+++ b/setup/git_version.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2019, Eli Schwartz <eschwartz@archlinux.org>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re
 import subprocess
diff --git a/setup/gui.py b/setup/gui.py
index 2a0c1ecf24..17c880d122 100644
--- a/setup/gui.py
+++ b/setup/gui.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/install.py b/setup/install.py
index 852bbdc385..15f1d47665 100644
--- a/setup/install.py
+++ b/setup/install.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2009, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import atexit
 import glob
diff --git a/setup/installers.py b/setup/installers.py
index 65d6ad8ab7..c3ad5bfe18 100644
--- a/setup/installers.py
+++ b/setup/installers.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os, sys, subprocess, binascii, json
 
diff --git a/setup/lc_data.py b/setup/lc_data.py
index 77df405378..a843bab3bb 100644
--- a/setup/lc_data.py
+++ b/setup/lc_data.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/setup/linux-installer.py b/setup/linux-installer.py
index 03d573cef6..672f3ce5af 100644
--- a/setup/linux-installer.py
+++ b/setup/linux-installer.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2009, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import hashlib
diff --git a/setup/mathjax.py b/setup/mathjax.py
index 3b02ba5df3..80647ce220 100644
--- a/setup/mathjax.py
+++ b/setup/mathjax.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/setup/parallel_build.py b/setup/parallel_build.py
index d6bd5c63a2..448a5bd695 100644
--- a/setup/parallel_build.py
+++ b/setup/parallel_build.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/setup/plugins_mirror.py b/setup/plugins_mirror.py
index fea2f84007..f7f556b20d 100644
--- a/setup/plugins_mirror.py
+++ b/setup/plugins_mirror.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
 # Imports {{{
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import ast
 import atexit
diff --git a/setup/port.py b/setup/port.py
index 6267e4515d..8ee737d914 100644
--- a/setup/port.py
+++ b/setup/port.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import hashlib
diff --git a/setup/publish.py b/setup/publish.py
index 50e593722b..f9b8e381f3 100644
--- a/setup/publish.py
+++ b/setup/publish.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement
-from __future__ import print_function
+
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/resources.py b/setup/resources.py
index 053b8a00e2..2c7b41e3f6 100644
--- a/setup/resources.py
+++ b/setup/resources.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement, print_function
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/run-calibre-worker.py b/setup/run-calibre-worker.py
index 92bbef855f..c5f6cd7c52 100644
--- a/setup/run-calibre-worker.py
+++ b/setup/run-calibre-worker.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import sys, os
 sys.setup_dir = os.path.dirname(os.path.abspath(__file__))
 SRC = os.path.abspath(os.path.join(os.path.dirname(sys.setup_dir), 'src'))
diff --git a/setup/test.py b/setup/test.py
index 10f28f7001..d333f2e06c 100644
--- a/setup/test.py
+++ b/setup/test.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import unittest
diff --git a/setup/translations.py b/setup/translations.py
index 52c1ad3df3..5c21dd6f83 100644
--- a/setup/translations.py
+++ b/setup/translations.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement, print_function
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/setup/unix-ci.py b/setup/unix-ci.py
index db60f5d7bf..1c4631c54b 100644
--- a/setup/unix-ci.py
+++ b/setup/unix-ci.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import shlex
diff --git a/setup/upload.py b/setup/upload.py
index 7e4f022d6f..44e38a2f23 100644
--- a/setup/upload.py
+++ b/setup/upload.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
-from __future__ import print_function
+
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/setup/vcvars.py b/setup/vcvars.py
index 7fa3b0fb50..1409861c27 100644
--- a/setup/vcvars.py
+++ b/setup/vcvars.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/setup/win-ci.py b/setup/win-ci.py
index 62a2ca34c4..d97f584706 100644
--- a/setup/win-ci.py
+++ b/setup/win-ci.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import io
 import os
diff --git a/src/backports/functools_lru_cache.py b/src/backports/functools_lru_cache.py
index cf53cd4110..dd4335273c 100644
--- a/src/backports/functools_lru_cache.py
+++ b/src/backports/functools_lru_cache.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import functools
 from collections import namedtuple
diff --git a/src/calibre/__init__.py b/src/calibre/__init__.py
index 30d38f621c..65155fb3db 100644
--- a/src/calibre/__init__.py
+++ b/src/calibre/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, print_function
+
 ''' E-book management software'''
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/constants.py b/src/calibre/constants.py
index 0d1944ff96..b8dd13e8ed 100644
--- a/src/calibre/constants.py
+++ b/src/calibre/constants.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import print_function, unicode_literals
 from polyglot.builtins import map, unicode_type, environ_item, hasenv, getenv, as_unicode, native_string_type
 import sys, locale, codecs, os, importlib, collections
 
diff --git a/src/calibre/customize/__init__.py b/src/calibre/customize/__init__.py
index 8878fb8a69..8de6759c98 100644
--- a/src/calibre/customize/__init__.py
+++ b/src/calibre/customize/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
diff --git a/src/calibre/customize/builtins.py b/src/calibre/customize/builtins.py
index 4a3af02002..8012323821 100644
--- a/src/calibre/customize/builtins.py
+++ b/src/calibre/customize/builtins.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/customize/conversion.py b/src/calibre/customize/conversion.py
index ba8112f569..4b33f77ec1 100644
--- a/src/calibre/customize/conversion.py
+++ b/src/calibre/customize/conversion.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Defines the plugin system for conversions.
 '''
diff --git a/src/calibre/customize/profiles.py b/src/calibre/customize/profiles.py
index cfefb09400..999a40e867 100644
--- a/src/calibre/customize/profiles.py
+++ b/src/calibre/customize/profiles.py
@@ -1,5 +1,5 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/customize/ui.py b/src/calibre/customize/ui.py
index 53cdfd180a..dbab8adb56 100644
--- a/src/calibre/customize/ui.py
+++ b/src/calibre/customize/ui.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
diff --git a/src/calibre/customize/zipplugin.py b/src/calibre/customize/zipplugin.py
index 8f73d1d9ad..45a664f43c 100644
--- a/src/calibre/customize/zipplugin.py
+++ b/src/calibre/customize/zipplugin.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/__init__.py b/src/calibre/db/__init__.py
index daef9300aa..73c707727c 100644
--- a/src/calibre/db/__init__.py
+++ b/src/calibre/db/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/adding.py b/src/calibre/db/adding.py
index 73da7b52ec..dbe723bb72 100644
--- a/src/calibre/db/adding.py
+++ b/src/calibre/db/adding.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/backend.py b/src/calibre/db/backend.py
index 999e26a921..959bd84dbb 100644
--- a/src/calibre/db/backend.py
+++ b/src/calibre/db/backend.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/backup.py b/src/calibre/db/backup.py
index 4acf367089..e103769564 100644
--- a/src/calibre/db/backup.py
+++ b/src/calibre/db/backup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/cache.py b/src/calibre/db/cache.py
index b7d1b15675..8361f9e423 100644
--- a/src/calibre/db/cache.py
+++ b/src/calibre/db/cache.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/categories.py b/src/calibre/db/categories.py
index c3c682e92b..bc972a1ba9 100644
--- a/src/calibre/db/categories.py
+++ b/src/calibre/db/categories.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/cli/__init__.py b/src/calibre/db/cli/__init__.py
index 0df30da4ca..45ef2b323c 100644
--- a/src/calibre/db/cli/__init__.py
+++ b/src/calibre/db/cli/__init__.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import importlib
 
diff --git a/src/calibre/db/cli/cmd_add.py b/src/calibre/db/cli/cmd_add.py
index dcb5bfb93c..6c13802b7a 100644
--- a/src/calibre/db/cli/cmd_add.py
+++ b/src/calibre/db/cli/cmd_add.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import sys
diff --git a/src/calibre/db/cli/cmd_add_custom_column.py b/src/calibre/db/cli/cmd_add_custom_column.py
index 46514d0c27..ca217d8607 100644
--- a/src/calibre/db/cli/cmd_add_custom_column.py
+++ b/src/calibre/db/cli/cmd_add_custom_column.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 
diff --git a/src/calibre/db/cli/cmd_add_format.py b/src/calibre/db/cli/cmd_add_format.py
index b47e37e0af..39408b03ee 100644
--- a/src/calibre/db/cli/cmd_add_format.py
+++ b/src/calibre/db/cli/cmd_add_format.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 from io import BytesIO
diff --git a/src/calibre/db/cli/cmd_backup_metadata.py b/src/calibre/db/cli/cmd_backup_metadata.py
index 3660e89cbd..a961d5bc6e 100644
--- a/src/calibre/db/cli/cmd_backup_metadata.py
+++ b/src/calibre/db/cli/cmd_backup_metadata.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre import prints
 
diff --git a/src/calibre/db/cli/cmd_catalog.py b/src/calibre/db/cli/cmd_catalog.py
index 5325707b79..c4b7456681 100644
--- a/src/calibre/db/cli/cmd_catalog.py
+++ b/src/calibre/db/cli/cmd_catalog.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 
diff --git a/src/calibre/db/cli/cmd_check_library.py b/src/calibre/db/cli/cmd_check_library.py
index 216bb7bfe1..29a08b0755 100644
--- a/src/calibre/db/cli/cmd_check_library.py
+++ b/src/calibre/db/cli/cmd_check_library.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import csv
 import sys
diff --git a/src/calibre/db/cli/cmd_clone.py b/src/calibre/db/cli/cmd_clone.py
index 70f821ca55..3d66fa5710 100644
--- a/src/calibre/db/cli/cmd_clone.py
+++ b/src/calibre/db/cli/cmd_clone.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 
diff --git a/src/calibre/db/cli/cmd_custom_columns.py b/src/calibre/db/cli/cmd_custom_columns.py
index ae2e209c5e..adeb142028 100644
--- a/src/calibre/db/cli/cmd_custom_columns.py
+++ b/src/calibre/db/cli/cmd_custom_columns.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from pprint import pformat
 
diff --git a/src/calibre/db/cli/cmd_embed_metadata.py b/src/calibre/db/cli/cmd_embed_metadata.py
index 2de056f0d9..fc5378a483 100644
--- a/src/calibre/db/cli/cmd_embed_metadata.py
+++ b/src/calibre/db/cli/cmd_embed_metadata.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre import prints
 from calibre.db.cli import integers_from_string
diff --git a/src/calibre/db/cli/cmd_export.py b/src/calibre/db/cli/cmd_export.py
index ff72595d4b..b0a778e270 100644
--- a/src/calibre/db/cli/cmd_export.py
+++ b/src/calibre/db/cli/cmd_export.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 
diff --git a/src/calibre/db/cli/cmd_list.py b/src/calibre/db/cli/cmd_list.py
index 4e66333c2d..79655632c8 100644
--- a/src/calibre/db/cli/cmd_list.py
+++ b/src/calibre/db/cli/cmd_list.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import os
diff --git a/src/calibre/db/cli/cmd_list_categories.py b/src/calibre/db/cli/cmd_list_categories.py
index a858c61588..6ba23754d5 100644
--- a/src/calibre/db/cli/cmd_list_categories.py
+++ b/src/calibre/db/cli/cmd_list_categories.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import csv
 import sys
diff --git a/src/calibre/db/cli/cmd_remove.py b/src/calibre/db/cli/cmd_remove.py
index 0477b4ce4b..01daf54b63 100644
--- a/src/calibre/db/cli/cmd_remove.py
+++ b/src/calibre/db/cli/cmd_remove.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.db.cli import integers_from_string
 from calibre.db.delete_service import delete_service
diff --git a/src/calibre/db/cli/cmd_remove_custom_column.py b/src/calibre/db/cli/cmd_remove_custom_column.py
index 451caa57a8..534ba204f5 100644
--- a/src/calibre/db/cli/cmd_remove_custom_column.py
+++ b/src/calibre/db/cli/cmd_remove_custom_column.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys
 from calibre import prints
diff --git a/src/calibre/db/cli/cmd_remove_format.py b/src/calibre/db/cli/cmd_remove_format.py
index 0661519169..b360e2f43c 100644
--- a/src/calibre/db/cli/cmd_remove_format.py
+++ b/src/calibre/db/cli/cmd_remove_format.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.db.delete_service import delete_service
 from calibre.srv.changes import formats_removed
diff --git a/src/calibre/db/cli/cmd_restore_database.py b/src/calibre/db/cli/cmd_restore_database.py
index 91bb9827e0..c2d854cc81 100644
--- a/src/calibre/db/cli/cmd_restore_database.py
+++ b/src/calibre/db/cli/cmd_restore_database.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre import prints
 from calibre.db.restore import Restore
diff --git a/src/calibre/db/cli/cmd_saved_searches.py b/src/calibre/db/cli/cmd_saved_searches.py
index d87d3516d7..b8360f3e38 100644
--- a/src/calibre/db/cli/cmd_saved_searches.py
+++ b/src/calibre/db/cli/cmd_saved_searches.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 readonly = False
 version = 0  # change this if you change signature of implementation()
diff --git a/src/calibre/db/cli/cmd_search.py b/src/calibre/db/cli/cmd_search.py
index 685689cb68..31a46f3630 100644
--- a/src/calibre/db/cli/cmd_search.py
+++ b/src/calibre/db/cli/cmd_search.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre import prints
 
diff --git a/src/calibre/db/cli/cmd_set_custom.py b/src/calibre/db/cli/cmd_set_custom.py
index 7e7841a0d5..4c184c4697 100644
--- a/src/calibre/db/cli/cmd_set_custom.py
+++ b/src/calibre/db/cli/cmd_set_custom.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre import prints
 from calibre.db import _get_series_values
diff --git a/src/calibre/db/cli/cmd_set_metadata.py b/src/calibre/db/cli/cmd_set_metadata.py
index 708ffd9bca..b48f153039 100644
--- a/src/calibre/db/cli/cmd_set_metadata.py
+++ b/src/calibre/db/cli/cmd_set_metadata.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 
diff --git a/src/calibre/db/cli/cmd_show_metadata.py b/src/calibre/db/cli/cmd_show_metadata.py
index 7cb2cc4153..36177639c8 100644
--- a/src/calibre/db/cli/cmd_show_metadata.py
+++ b/src/calibre/db/cli/cmd_show_metadata.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys
 
diff --git a/src/calibre/db/cli/main.py b/src/calibre/db/cli/main.py
index 312b303f7d..f78be8b3f9 100644
--- a/src/calibre/db/cli/main.py
+++ b/src/calibre/db/cli/main.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import os
diff --git a/src/calibre/db/cli/tests.py b/src/calibre/db/cli/tests.py
index 98b8775ed3..80e44c4536 100644
--- a/src/calibre/db/cli/tests.py
+++ b/src/calibre/db/cli/tests.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/db/cli/utils.py b/src/calibre/db/cli/utils.py
index ec64af4349..2825a5dff0 100644
--- a/src/calibre/db/cli/utils.py
+++ b/src/calibre/db/cli/utils.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import map
 
diff --git a/src/calibre/db/copy_to_library.py b/src/calibre/db/copy_to_library.py
index 6896f93c15..caeb86bc9d 100644
--- a/src/calibre/db/copy_to_library.py
+++ b/src/calibre/db/copy_to_library.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.db.utils import find_identical_books
 from calibre.utils.config import tweaks
diff --git a/src/calibre/db/delete_service.py b/src/calibre/db/delete_service.py
index 8b984f41c4..8be9cd4ffd 100644
--- a/src/calibre/db/delete_service.py
+++ b/src/calibre/db/delete_service.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/errors.py b/src/calibre/db/errors.py
index 616f86f0e7..564e58c822 100644
--- a/src/calibre/db/errors.py
+++ b/src/calibre/db/errors.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/fields.py b/src/calibre/db/fields.py
index 94bf61dbd7..e0d0fcd807 100644
--- a/src/calibre/db/fields.py
+++ b/src/calibre/db/fields.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/lazy.py b/src/calibre/db/lazy.py
index dbc6584174..9ad3aba57d 100644
--- a/src/calibre/db/lazy.py
+++ b/src/calibre/db/lazy.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/legacy.py b/src/calibre/db/legacy.py
index 7a420e0295..e88b499ffb 100644
--- a/src/calibre/db/legacy.py
+++ b/src/calibre/db/legacy.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/locking.py b/src/calibre/db/locking.py
index 52e9c954a6..e0830f46d8 100644
--- a/src/calibre/db/locking.py
+++ b/src/calibre/db/locking.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/restore.py b/src/calibre/db/restore.py
index c3d7003807..0840bb0470 100644
--- a/src/calibre/db/restore.py
+++ b/src/calibre/db/restore.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
-from __future__ import unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/schema_upgrades.py b/src/calibre/db/schema_upgrades.py
index ab849ca189..acd7a20178 100644
--- a/src/calibre/db/schema_upgrades.py
+++ b/src/calibre/db/schema_upgrades.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/search.py b/src/calibre/db/search.py
index e73633baeb..336e46e78a 100644
--- a/src/calibre/db/search.py
+++ b/src/calibre/db/search.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/tables.py b/src/calibre/db/tables.py
index d203a423b9..c81cae5ce0 100644
--- a/src/calibre/db/tables.py
+++ b/src/calibre/db/tables.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/tests/__init__.py b/src/calibre/db/tests/__init__.py
index ec9ca8ff95..219dc1f99c 100644
--- a/src/calibre/db/tests/__init__.py
+++ b/src/calibre/db/tests/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/tests/add_remove.py b/src/calibre/db/tests/add_remove.py
index 803fc5edc0..f2f94f6d0e 100644
--- a/src/calibre/db/tests/add_remove.py
+++ b/src/calibre/db/tests/add_remove.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/tests/base.py b/src/calibre/db/tests/base.py
index 388b9df244..9c3c36713b 100644
--- a/src/calibre/db/tests/base.py
+++ b/src/calibre/db/tests/base.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/tests/filesystem.py b/src/calibre/db/tests/filesystem.py
index 7df945fc11..0254c80cfd 100644
--- a/src/calibre/db/tests/filesystem.py
+++ b/src/calibre/db/tests/filesystem.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/tests/legacy.py b/src/calibre/db/tests/legacy.py
index 5f5af062e5..30a4656c31 100644
--- a/src/calibre/db/tests/legacy.py
+++ b/src/calibre/db/tests/legacy.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/tests/locking.py b/src/calibre/db/tests/locking.py
index b0ba047153..aa046ffbe5 100644
--- a/src/calibre/db/tests/locking.py
+++ b/src/calibre/db/tests/locking.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/tests/main.py b/src/calibre/db/tests/main.py
index d8bee0ec7e..85f358a383 100644
--- a/src/calibre/db/tests/main.py
+++ b/src/calibre/db/tests/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/tests/profiling.py b/src/calibre/db/tests/profiling.py
index a75bd19d40..4c52282972 100644
--- a/src/calibre/db/tests/profiling.py
+++ b/src/calibre/db/tests/profiling.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/tests/reading.py b/src/calibre/db/tests/reading.py
index 665767723c..34ef6d28c0 100644
--- a/src/calibre/db/tests/reading.py
+++ b/src/calibre/db/tests/reading.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/tests/utils.py b/src/calibre/db/tests/utils.py
index 1b28319440..dcf8eba5b3 100644
--- a/src/calibre/db/tests/utils.py
+++ b/src/calibre/db/tests/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/tests/writing.py b/src/calibre/db/tests/writing.py
index e1416b1eb8..da6404cc75 100644
--- a/src/calibre/db/tests/writing.py
+++ b/src/calibre/db/tests/writing.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/utils.py b/src/calibre/db/utils.py
index 3c0127f647..f216990c18 100644
--- a/src/calibre/db/utils.py
+++ b/src/calibre/db/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/db/view.py b/src/calibre/db/view.py
index 7d750abece..1a9a5ef33d 100644
--- a/src/calibre/db/view.py
+++ b/src/calibre/db/view.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/db/write.py b/src/calibre/db/write.py
index e08da0416f..222e88dafa 100644
--- a/src/calibre/db/write.py
+++ b/src/calibre/db/write.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/debug.py b/src/calibre/debug.py
index c792f422eb..4454e7b720 100644
--- a/src/calibre/debug.py
+++ b/src/calibre/debug.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/__init__.py b/src/calibre/devices/__init__.py
index a32fd45c09..d423be27cd 100644
--- a/src/calibre/devices/__init__.py
+++ b/src/calibre/devices/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
diff --git a/src/calibre/devices/android/__init__.py b/src/calibre/devices/android/__init__.py
index a9b056d940..d8edc6064a 100644
--- a/src/calibre/devices/android/__init__.py
+++ b/src/calibre/devices/android/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/android/driver.py b/src/calibre/devices/android/driver.py
index f615afd704..f4b4137141 100644
--- a/src/calibre/devices/android/driver.py
+++ b/src/calibre/devices/android/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/binatone/driver.py b/src/calibre/devices/binatone/driver.py
index ec6e7a70b1..53a91bcc8c 100644
--- a/src/calibre/devices/binatone/driver.py
+++ b/src/calibre/devices/binatone/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/blackberry/__init__.py b/src/calibre/devices/blackberry/__init__.py
index e4919c22e9..f0a799e860 100644
--- a/src/calibre/devices/blackberry/__init__.py
+++ b/src/calibre/devices/blackberry/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/blackberry/driver.py b/src/calibre/devices/blackberry/driver.py
index 0054be93a0..7f6eeaae90 100644
--- a/src/calibre/devices/blackberry/driver.py
+++ b/src/calibre/devices/blackberry/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/boeye/driver.py b/src/calibre/devices/boeye/driver.py
index 17af18005d..d261670dbd 100644
--- a/src/calibre/devices/boeye/driver.py
+++ b/src/calibre/devices/boeye/driver.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011,  Ken <ken at szboeye.com>'
diff --git a/src/calibre/devices/cli.py b/src/calibre/devices/cli.py
index ea4afdf7c1..1d8b465b5c 100755
--- a/src/calibre/devices/cli.py
+++ b/src/calibre/devices/cli.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/cybook/driver.py b/src/calibre/devices/cybook/driver.py
index 6048387483..07f9f4d4a6 100644
--- a/src/calibre/devices/cybook/driver.py
+++ b/src/calibre/devices/cybook/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/cybook/t2b.py b/src/calibre/devices/cybook/t2b.py
index 444c251580..48ad9bcb87 100644
--- a/src/calibre/devices/cybook/t2b.py
+++ b/src/calibre/devices/cybook/t2b.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/cybook/t4b.py b/src/calibre/devices/cybook/t4b.py
index 8f71354fa5..dca767e9df 100644
--- a/src/calibre/devices/cybook/t4b.py
+++ b/src/calibre/devices/cybook/t4b.py
@@ -1,5 +1,5 @@
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2013, Jellby <jellby at yahoo.com>'
 '''
diff --git a/src/calibre/devices/eb600/driver.py b/src/calibre/devices/eb600/driver.py
index 739c56159e..b2de821336 100644
--- a/src/calibre/devices/eb600/driver.py
+++ b/src/calibre/devices/eb600/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/edge/driver.py b/src/calibre/devices/edge/driver.py
index e39ff579f2..d4bd1a7364 100644
--- a/src/calibre/devices/edge/driver.py
+++ b/src/calibre/devices/edge/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal'
diff --git a/src/calibre/devices/errors.py b/src/calibre/devices/errors.py
index 95877fc72c..a0d0b61ce8 100644
--- a/src/calibre/devices/errors.py
+++ b/src/calibre/devices/errors.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/eslick/__init__.py b/src/calibre/devices/eslick/__init__.py
index a9b056d940..d8edc6064a 100644
--- a/src/calibre/devices/eslick/__init__.py
+++ b/src/calibre/devices/eslick/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/eslick/driver.py b/src/calibre/devices/eslick/driver.py
index fc1ec0d393..328bddac5a 100644
--- a/src/calibre/devices/eslick/driver.py
+++ b/src/calibre/devices/eslick/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/folder_device/__init__.py b/src/calibre/devices/folder_device/__init__.py
index a9b056d940..d8edc6064a 100644
--- a/src/calibre/devices/folder_device/__init__.py
+++ b/src/calibre/devices/folder_device/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/folder_device/driver.py b/src/calibre/devices/folder_device/driver.py
index af9cc8c562..94366d5e1a 100644
--- a/src/calibre/devices/folder_device/driver.py
+++ b/src/calibre/devices/folder_device/driver.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Created on 15 May 2010
diff --git a/src/calibre/devices/hanlin/__init__.py b/src/calibre/devices/hanlin/__init__.py
index 15c918adaa..accbf2eede 100644
--- a/src/calibre/devices/hanlin/__init__.py
+++ b/src/calibre/devices/hanlin/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Tijmen Ruizendaal <tijmen at mybebook.com>'
diff --git a/src/calibre/devices/hanlin/driver.py b/src/calibre/devices/hanlin/driver.py
index 011fce8e5a..a0349cb24a 100644
--- a/src/calibre/devices/hanlin/driver.py
+++ b/src/calibre/devices/hanlin/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Tijmen Ruizendaal <tijmen at mybebook.com>'
diff --git a/src/calibre/devices/hanvon/driver.py b/src/calibre/devices/hanvon/driver.py
index ef74181db2..420fc4d7fa 100644
--- a/src/calibre/devices/hanvon/driver.py
+++ b/src/calibre/devices/hanvon/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/iliad/driver.py b/src/calibre/devices/iliad/driver.py
index 64a8e00b22..e63c38d965 100644
--- a/src/calibre/devices/iliad/driver.py
+++ b/src/calibre/devices/iliad/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/devices/interface.py b/src/calibre/devices/interface.py
index 1b1071d534..c593d45e20 100644
--- a/src/calibre/devices/interface.py
+++ b/src/calibre/devices/interface.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/irexdr/driver.py b/src/calibre/devices/irexdr/driver.py
index 305ba90032..d18ae315a7 100644
--- a/src/calibre/devices/irexdr/driver.py
+++ b/src/calibre/devices/irexdr/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/devices/iriver/__init__.py b/src/calibre/devices/iriver/__init__.py
index a9b056d940..d8edc6064a 100644
--- a/src/calibre/devices/iriver/__init__.py
+++ b/src/calibre/devices/iriver/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/iriver/driver.py b/src/calibre/devices/iriver/driver.py
index 36834464e7..83467f1bb8 100644
--- a/src/calibre/devices/iriver/driver.py
+++ b/src/calibre/devices/iriver/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/jetbook/driver.py b/src/calibre/devices/jetbook/driver.py
index edad664029..2683570808 100644
--- a/src/calibre/devices/jetbook/driver.py
+++ b/src/calibre/devices/jetbook/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, James Ralston <jralston at mindspring.com>'
diff --git a/src/calibre/devices/kindle/apnx.py b/src/calibre/devices/kindle/apnx.py
index e9a8639d0a..6a0faccf53 100644
--- a/src/calibre/devices/kindle/apnx.py
+++ b/src/calibre/devices/kindle/apnx.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/kindle/bookmark.py b/src/calibre/devices/kindle/bookmark.py
index d01e10e251..2537906773 100644
--- a/src/calibre/devices/kindle/bookmark.py
+++ b/src/calibre/devices/kindle/bookmark.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/devices/kindle/driver.py b/src/calibre/devices/kindle/driver.py
index 6527626374..14f328cbf1 100644
--- a/src/calibre/devices/kindle/driver.py
+++ b/src/calibre/devices/kindle/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/kobo/__init__.py b/src/calibre/devices/kobo/__init__.py
index 078ddb1bf4..b09471af7e 100644
--- a/src/calibre/devices/kobo/__init__.py
+++ b/src/calibre/devices/kobo/__init__.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/kobo/bookmark.py b/src/calibre/devices/kobo/bookmark.py
index 625f1be6d7..8de1b66944 100644
--- a/src/calibre/devices/kobo/bookmark.py
+++ b/src/calibre/devices/kobo/bookmark.py
@@ -1,5 +1,5 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Timothy Legge <timlegge@gmail.com> and Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/kobo/books.py b/src/calibre/devices/kobo/books.py
index f3561807fe..9a8d06798c 100644
--- a/src/calibre/devices/kobo/books.py
+++ b/src/calibre/devices/kobo/books.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2010-2012, , Timothy Legge <timlegge at gmail.com> and David Forrester <davidfor@internode.on.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/devices/kobo/driver.py b/src/calibre/devices/kobo/driver.py
index 0a3bee19ba..777d84b241 100644
--- a/src/calibre/devices/kobo/driver.py
+++ b/src/calibre/devices/kobo/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010-2019, Timothy Legge <timlegge@gmail.com>, Kovid Goyal <kovid@kovidgoyal.net> and David Forrester <davidfor@internode.on.net>'
diff --git a/src/calibre/devices/kobo/kobotouch_config.py b/src/calibre/devices/kobo/kobotouch_config.py
index c8a6623b76..3df355521e 100644
--- a/src/calibre/devices/kobo/kobotouch_config.py
+++ b/src/calibre/devices/kobo/kobotouch_config.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2015-2019, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mime.py b/src/calibre/devices/mime.py
index 0762ea7809..1853d40c2f 100644
--- a/src/calibre/devices/mime.py
+++ b/src/calibre/devices/mime.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/devices/misc.py b/src/calibre/devices/misc.py
index 7ee7fb15df..1d32426f00 100644
--- a/src/calibre/devices/misc.py
+++ b/src/calibre/devices/misc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/__init__.py b/src/calibre/devices/mtp/__init__.py
index 5f6c324bfc..6b2910c3df 100644
--- a/src/calibre/devices/mtp/__init__.py
+++ b/src/calibre/devices/mtp/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/base.py b/src/calibre/devices/mtp/base.py
index 79d342c86f..eaf199671d 100644
--- a/src/calibre/devices/mtp/base.py
+++ b/src/calibre/devices/mtp/base.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/books.py b/src/calibre/devices/mtp/books.py
index 3f65d80d1d..e58fab1af9 100644
--- a/src/calibre/devices/mtp/books.py
+++ b/src/calibre/devices/mtp/books.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/defaults.py b/src/calibre/devices/mtp/defaults.py
index 9c1d66c461..33a730f539 100644
--- a/src/calibre/devices/mtp/defaults.py
+++ b/src/calibre/devices/mtp/defaults.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/driver.py b/src/calibre/devices/mtp/driver.py
index 0a13169373..e35d3d996b 100644
--- a/src/calibre/devices/mtp/driver.py
+++ b/src/calibre/devices/mtp/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/filesystem_cache.py b/src/calibre/devices/mtp/filesystem_cache.py
index 1789e3b399..b43361583e 100644
--- a/src/calibre/devices/mtp/filesystem_cache.py
+++ b/src/calibre/devices/mtp/filesystem_cache.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/test.py b/src/calibre/devices/mtp/test.py
index f36ffeacec..b39170e2f0 100644
--- a/src/calibre/devices/mtp/test.py
+++ b/src/calibre/devices/mtp/test.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/unix/__init__.py b/src/calibre/devices/mtp/unix/__init__.py
index 4fc65986b7..004e23d52d 100644
--- a/src/calibre/devices/mtp/unix/__init__.py
+++ b/src/calibre/devices/mtp/unix/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/unix/driver.py b/src/calibre/devices/mtp/unix/driver.py
index 47e1d5c392..bb5b235e8a 100644
--- a/src/calibre/devices/mtp/unix/driver.py
+++ b/src/calibre/devices/mtp/unix/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/unix/sysfs.py b/src/calibre/devices/mtp/unix/sysfs.py
index 5ec178f9fa..577d4f6688 100644
--- a/src/calibre/devices/mtp/unix/sysfs.py
+++ b/src/calibre/devices/mtp/unix/sysfs.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/unix/upstream/update.py b/src/calibre/devices/mtp/unix/upstream/update.py
index 43b8d1aa1c..54e17e5c23 100755
--- a/src/calibre/devices/mtp/unix/upstream/update.py
+++ b/src/calibre/devices/mtp/unix/upstream/update.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/windows/__init__.py b/src/calibre/devices/mtp/windows/__init__.py
index 2b86b54dc3..3610d3374c 100644
--- a/src/calibre/devices/mtp/windows/__init__.py
+++ b/src/calibre/devices/mtp/windows/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/windows/driver.py b/src/calibre/devices/mtp/windows/driver.py
index cc2d4ce238..712f895248 100644
--- a/src/calibre/devices/mtp/windows/driver.py
+++ b/src/calibre/devices/mtp/windows/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/mtp/windows/remote.py b/src/calibre/devices/mtp/windows/remote.py
index 80b892302c..2bbe8ae766 100644
--- a/src/calibre/devices/mtp/windows/remote.py
+++ b/src/calibre/devices/mtp/windows/remote.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/nokia/driver.py b/src/calibre/devices/nokia/driver.py
index 4041b44afb..b3b9b8a94d 100644
--- a/src/calibre/devices/nokia/driver.py
+++ b/src/calibre/devices/nokia/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009-2014, John Schember <john at nachtimwald.com> and Andres Gomez <agomez at igalia.com>'
diff --git a/src/calibre/devices/nook/driver.py b/src/calibre/devices/nook/driver.py
index 1bf1101467..23a5e81b83 100644
--- a/src/calibre/devices/nook/driver.py
+++ b/src/calibre/devices/nook/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/nuut2/driver.py b/src/calibre/devices/nuut2/driver.py
index 3c8b21c07c..7a4c76b5a0 100644
--- a/src/calibre/devices/nuut2/driver.py
+++ b/src/calibre/devices/nuut2/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/paladin/__init__.py b/src/calibre/devices/paladin/__init__.py
index c63cb57432..463ad37bb2 100644
--- a/src/calibre/devices/paladin/__init__.py
+++ b/src/calibre/devices/paladin/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/paladin/driver.py b/src/calibre/devices/paladin/driver.py
index 4cfc6b3616..75a1a545c4 100644
--- a/src/calibre/devices/paladin/driver.py
+++ b/src/calibre/devices/paladin/driver.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Device driver for the Paladin devices
 '''
diff --git a/src/calibre/devices/prs505/__init__.py b/src/calibre/devices/prs505/__init__.py
index f0290e7e27..7b237f281b 100644
--- a/src/calibre/devices/prs505/__init__.py
+++ b/src/calibre/devices/prs505/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/prs505/driver.py b/src/calibre/devices/prs505/driver.py
index 2a11f661e6..fd3e5d2176 100644
--- a/src/calibre/devices/prs505/driver.py
+++ b/src/calibre/devices/prs505/driver.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/prs505/sony_cache.py b/src/calibre/devices/prs505/sony_cache.py
index 1ce4a3fe58..d6aff913ce 100644
--- a/src/calibre/devices/prs505/sony_cache.py
+++ b/src/calibre/devices/prs505/sony_cache.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/prst1/__init__.py b/src/calibre/devices/prst1/__init__.py
index c63cb57432..463ad37bb2 100644
--- a/src/calibre/devices/prst1/__init__.py
+++ b/src/calibre/devices/prst1/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/prst1/driver.py b/src/calibre/devices/prst1/driver.py
index 399186eb9e..b9dfc65406 100644
--- a/src/calibre/devices/prst1/driver.py
+++ b/src/calibre/devices/prst1/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/scanner.py b/src/calibre/devices/scanner.py
index 33e0287b24..924091605f 100644
--- a/src/calibre/devices/scanner.py
+++ b/src/calibre/devices/scanner.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 '''
diff --git a/src/calibre/devices/smart_device_app/__init__.py b/src/calibre/devices/smart_device_app/__init__.py
index 078ddb1bf4..b09471af7e 100644
--- a/src/calibre/devices/smart_device_app/__init__.py
+++ b/src/calibre/devices/smart_device_app/__init__.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/smart_device_app/driver.py b/src/calibre/devices/smart_device_app/driver.py
index 0266d551d1..eb99b7b800 100644
--- a/src/calibre/devices/smart_device_app/driver.py
+++ b/src/calibre/devices/smart_device_app/driver.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Created on 29 Jun 2012
 
diff --git a/src/calibre/devices/sne/driver.py b/src/calibre/devices/sne/driver.py
index 3d79ccab6a..357b7ea511 100644
--- a/src/calibre/devices/sne/driver.py
+++ b/src/calibre/devices/sne/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/teclast/__init__.py b/src/calibre/devices/teclast/__init__.py
index 3e2240e94d..c227aeaca5 100644
--- a/src/calibre/devices/teclast/__init__.py
+++ b/src/calibre/devices/teclast/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/teclast/driver.py b/src/calibre/devices/teclast/driver.py
index 1de803da8c..81c65e7d6d 100644
--- a/src/calibre/devices/teclast/driver.py
+++ b/src/calibre/devices/teclast/driver.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/udisks.py b/src/calibre/devices/udisks.py
index 13711b60eb..46d6741bf3 100644
--- a/src/calibre/devices/udisks.py
+++ b/src/calibre/devices/udisks.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/usbms/books.py b/src/calibre/devices/usbms/books.py
index bbb89e316c..692190c1b6 100644
--- a/src/calibre/devices/usbms/books.py
+++ b/src/calibre/devices/usbms/books.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/devices/usbms/cli.py b/src/calibre/devices/usbms/cli.py
index 20319c23b3..7a4dc0f893 100644
--- a/src/calibre/devices/usbms/cli.py
+++ b/src/calibre/devices/usbms/cli.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/devices/usbms/device.py b/src/calibre/devices/usbms/device.py
index 2a474fd1d2..67f45964ba 100644
--- a/src/calibre/devices/usbms/device.py
+++ b/src/calibre/devices/usbms/device.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com> ' \
diff --git a/src/calibre/devices/usbms/deviceconfig.py b/src/calibre/devices/usbms/deviceconfig.py
index 0ec0d5a27f..0f1cb37b7f 100644
--- a/src/calibre/devices/usbms/deviceconfig.py
+++ b/src/calibre/devices/usbms/deviceconfig.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/devices/usbms/driver.py b/src/calibre/devices/usbms/driver.py
index 95907abcbf..d8c8ada680 100644
--- a/src/calibre/devices/usbms/driver.py
+++ b/src/calibre/devices/usbms/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john at nachtimwald.com>'
diff --git a/src/calibre/devices/user_defined/driver.py b/src/calibre/devices/user_defined/driver.py
index 8886510de3..fcaf24364d 100644
--- a/src/calibre/devices/user_defined/driver.py
+++ b/src/calibre/devices/user_defined/driver.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/devices/utils.py b/src/calibre/devices/utils.py
index 401fc860e7..0cb0ad1bd9 100644
--- a/src/calibre/devices/utils.py
+++ b/src/calibre/devices/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/devices/winusb.py b/src/calibre/devices/winusb.py
index f3256c7a68..207507d323 100644
--- a/src/calibre/devices/winusb.py
+++ b/src/calibre/devices/winusb.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os, string, re, sys
 from collections import namedtuple, defaultdict
diff --git a/src/calibre/ebooks/BeautifulSoup.py b/src/calibre/ebooks/BeautifulSoup.py
index 038e98620b..ed0a43b4f1 100644
--- a/src/calibre/ebooks/BeautifulSoup.py
+++ b/src/calibre/ebooks/BeautifulSoup.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import bs4
 from bs4 import (  # noqa
diff --git a/src/calibre/ebooks/__init__.py b/src/calibre/ebooks/__init__.py
index a88f7519f6..6e5eac642b 100644
--- a/src/calibre/ebooks/__init__.py
+++ b/src/calibre/ebooks/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/azw4/reader.py b/src/calibre/ebooks/azw4/reader.py
index 6726e7b32d..c07b620d63 100644
--- a/src/calibre/ebooks/azw4/reader.py
+++ b/src/calibre/ebooks/azw4/reader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read content from azw4 file.
diff --git a/src/calibre/ebooks/chardet.py b/src/calibre/ebooks/chardet.py
index b6104a26b2..56bbe69de6 100644
--- a/src/calibre/ebooks/chardet.py
+++ b/src/calibre/ebooks/chardet.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/chm/__init__.py b/src/calibre/ebooks/chm/__init__.py
index 9c0d7f81fe..5f42cd2ed7 100644
--- a/src/calibre/ebooks/chm/__init__.py
+++ b/src/calibre/ebooks/chm/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/chm/metadata.py b/src/calibre/ebooks/chm/metadata.py
index fb134088ee..9278f758bd 100644
--- a/src/calibre/ebooks/chm/metadata.py
+++ b/src/calibre/ebooks/chm/metadata.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/chm/reader.py b/src/calibre/ebooks/chm/reader.py
index b5ce8981be..31a04223db 100644
--- a/src/calibre/ebooks/chm/reader.py
+++ b/src/calibre/ebooks/chm/reader.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 ''' CHM File decoding support '''
 __license__ = 'GPL v3'
diff --git a/src/calibre/ebooks/comic/__init__.py b/src/calibre/ebooks/comic/__init__.py
index 4307a071a3..64342a0920 100644
--- a/src/calibre/ebooks/comic/__init__.py
+++ b/src/calibre/ebooks/comic/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/comic/input.py b/src/calibre/ebooks/comic/input.py
index 8512b30b97..13cfb8af0d 100644
--- a/src/calibre/ebooks/comic/input.py
+++ b/src/calibre/ebooks/comic/input.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/compression/__init__.py b/src/calibre/ebooks/compression/__init__.py
index c2b701674a..c8ab3b77a5 100644
--- a/src/calibre/ebooks/compression/__init__.py
+++ b/src/calibre/ebooks/compression/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/compression/palmdoc.py b/src/calibre/ebooks/compression/palmdoc.py
index 8d2a19783c..01f70bd67b 100644
--- a/src/calibre/ebooks/compression/palmdoc.py
+++ b/src/calibre/ebooks/compression/palmdoc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/compression/tcr.py b/src/calibre/ebooks/compression/tcr.py
index 3080084196..453e14395a 100644
--- a/src/calibre/ebooks/compression/tcr.py
+++ b/src/calibre/ebooks/compression/tcr.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/constants.py b/src/calibre/ebooks/constants.py
index 02d27f6a9f..8cc5d43e27 100644
--- a/src/calibre/ebooks/constants.py
+++ b/src/calibre/ebooks/constants.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/__init__.py b/src/calibre/ebooks/conversion/__init__.py
index be49b37591..d48f093caf 100644
--- a/src/calibre/ebooks/conversion/__init__.py
+++ b/src/calibre/ebooks/conversion/__init__.py
@@ -1,5 +1,5 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/cli.py b/src/calibre/ebooks/conversion/cli.py
index ce706aea73..9bdb34ee6d 100644
--- a/src/calibre/ebooks/conversion/cli.py
+++ b/src/calibre/ebooks/conversion/cli.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/config.py b/src/calibre/ebooks/conversion/config.py
index ee1dc6e708..459caab0d3 100644
--- a/src/calibre/ebooks/conversion/config.py
+++ b/src/calibre/ebooks/conversion/config.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/__init__.py b/src/calibre/ebooks/conversion/plugins/__init__.py
index 5f6c324bfc..6b2910c3df 100644
--- a/src/calibre/ebooks/conversion/plugins/__init__.py
+++ b/src/calibre/ebooks/conversion/plugins/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/azw4_input.py b/src/calibre/ebooks/conversion/plugins/azw4_input.py
index d3a7e6a5f9..c381e9809c 100644
--- a/src/calibre/ebooks/conversion/plugins/azw4_input.py
+++ b/src/calibre/ebooks/conversion/plugins/azw4_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/chm_input.py b/src/calibre/ebooks/conversion/plugins/chm_input.py
index 44f5de5f88..7ba0c601a4 100644
--- a/src/calibre/ebooks/conversion/plugins/chm_input.py
+++ b/src/calibre/ebooks/conversion/plugins/chm_input.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 ''' CHM File decoding support '''
 __license__ = 'GPL v3'
diff --git a/src/calibre/ebooks/conversion/plugins/comic_input.py b/src/calibre/ebooks/conversion/plugins/comic_input.py
index 033a35cdf7..4a373ba340 100644
--- a/src/calibre/ebooks/conversion/plugins/comic_input.py
+++ b/src/calibre/ebooks/conversion/plugins/comic_input.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/conversion/plugins/djvu_input.py b/src/calibre/ebooks/conversion/plugins/djvu_input.py
index ed61ff04d3..d9d22cf6b9 100644
--- a/src/calibre/ebooks/conversion/plugins/djvu_input.py
+++ b/src/calibre/ebooks/conversion/plugins/djvu_input.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, Anthon van der Neut <anthon@mnt.org>'
diff --git a/src/calibre/ebooks/conversion/plugins/docx_input.py b/src/calibre/ebooks/conversion/plugins/docx_input.py
index bb08884eb8..e69cef7407 100644
--- a/src/calibre/ebooks/conversion/plugins/docx_input.py
+++ b/src/calibre/ebooks/conversion/plugins/docx_input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/docx_output.py b/src/calibre/ebooks/conversion/plugins/docx_output.py
index e5fd2f42ac..b8aa8002fb 100644
--- a/src/calibre/ebooks/conversion/plugins/docx_output.py
+++ b/src/calibre/ebooks/conversion/plugins/docx_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/epub_input.py b/src/calibre/ebooks/conversion/plugins/epub_input.py
index 7c60b0e606..1ad6d8d290 100644
--- a/src/calibre/ebooks/conversion/plugins/epub_input.py
+++ b/src/calibre/ebooks/conversion/plugins/epub_input.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/epub_output.py b/src/calibre/ebooks/conversion/plugins/epub_output.py
index 9b0efce177..1607d4fe42 100644
--- a/src/calibre/ebooks/conversion/plugins/epub_output.py
+++ b/src/calibre/ebooks/conversion/plugins/epub_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/fb2_input.py b/src/calibre/ebooks/conversion/plugins/fb2_input.py
index d82220d021..3a63a91b4b 100644
--- a/src/calibre/ebooks/conversion/plugins/fb2_input.py
+++ b/src/calibre/ebooks/conversion/plugins/fb2_input.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Anatoly Shipitsin <norguhtar at gmail.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/fb2_output.py b/src/calibre/ebooks/conversion/plugins/fb2_output.py
index ce99457d0c..2c99437846 100644
--- a/src/calibre/ebooks/conversion/plugins/fb2_output.py
+++ b/src/calibre/ebooks/conversion/plugins/fb2_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/html_input.py b/src/calibre/ebooks/conversion/plugins/html_input.py
index 7474ab7906..3350ad43fa 100644
--- a/src/calibre/ebooks/conversion/plugins/html_input.py
+++ b/src/calibre/ebooks/conversion/plugins/html_input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/html_output.py b/src/calibre/ebooks/conversion/plugins/html_output.py
index b45c3c61f0..1aa29c86d5 100644
--- a/src/calibre/ebooks/conversion/plugins/html_output.py
+++ b/src/calibre/ebooks/conversion/plugins/html_output.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Fabian Grassl <fg@jusmeum.de>'
diff --git a/src/calibre/ebooks/conversion/plugins/htmlz_input.py b/src/calibre/ebooks/conversion/plugins/htmlz_input.py
index baed0c1ac7..05c6f52faa 100644
--- a/src/calibre/ebooks/conversion/plugins/htmlz_input.py
+++ b/src/calibre/ebooks/conversion/plugins/htmlz_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/ebooks/conversion/plugins/htmlz_output.py b/src/calibre/ebooks/conversion/plugins/htmlz_output.py
index c72fd09adf..ee63954dd8 100644
--- a/src/calibre/ebooks/conversion/plugins/htmlz_output.py
+++ b/src/calibre/ebooks/conversion/plugins/htmlz_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/ebooks/conversion/plugins/lit_input.py b/src/calibre/ebooks/conversion/plugins/lit_input.py
index 65b94d0119..16a3c376d5 100644
--- a/src/calibre/ebooks/conversion/plugins/lit_input.py
+++ b/src/calibre/ebooks/conversion/plugins/lit_input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/lit_output.py b/src/calibre/ebooks/conversion/plugins/lit_output.py
index 9c266ffc70..46e3c22e13 100644
--- a/src/calibre/ebooks/conversion/plugins/lit_output.py
+++ b/src/calibre/ebooks/conversion/plugins/lit_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/lrf_input.py b/src/calibre/ebooks/conversion/plugins/lrf_input.py
index 8052e32c76..e3d5e6cc25 100644
--- a/src/calibre/ebooks/conversion/plugins/lrf_input.py
+++ b/src/calibre/ebooks/conversion/plugins/lrf_input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/lrf_output.py b/src/calibre/ebooks/conversion/plugins/lrf_output.py
index 2797347cf1..26650a8a69 100644
--- a/src/calibre/ebooks/conversion/plugins/lrf_output.py
+++ b/src/calibre/ebooks/conversion/plugins/lrf_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/mobi_input.py b/src/calibre/ebooks/conversion/plugins/mobi_input.py
index 34e0f466ff..457ece8bca 100644
--- a/src/calibre/ebooks/conversion/plugins/mobi_input.py
+++ b/src/calibre/ebooks/conversion/plugins/mobi_input.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/mobi_output.py b/src/calibre/ebooks/conversion/plugins/mobi_output.py
index 0ff7a8cd9a..6151abfc68 100644
--- a/src/calibre/ebooks/conversion/plugins/mobi_output.py
+++ b/src/calibre/ebooks/conversion/plugins/mobi_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/odt_input.py b/src/calibre/ebooks/conversion/plugins/odt_input.py
index f2f045b977..33989d16af 100644
--- a/src/calibre/ebooks/conversion/plugins/odt_input.py
+++ b/src/calibre/ebooks/conversion/plugins/odt_input.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/conversion/plugins/oeb_output.py b/src/calibre/ebooks/conversion/plugins/oeb_output.py
index df1aa4ef08..8d2ae95bdb 100644
--- a/src/calibre/ebooks/conversion/plugins/oeb_output.py
+++ b/src/calibre/ebooks/conversion/plugins/oeb_output.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/pdb_input.py b/src/calibre/ebooks/conversion/plugins/pdb_input.py
index a55a4ffec3..c0115b0a93 100644
--- a/src/calibre/ebooks/conversion/plugins/pdb_input.py
+++ b/src/calibre/ebooks/conversion/plugins/pdb_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/pdb_output.py b/src/calibre/ebooks/conversion/plugins/pdb_output.py
index b4c67f1139..9e41476798 100644
--- a/src/calibre/ebooks/conversion/plugins/pdb_output.py
+++ b/src/calibre/ebooks/conversion/plugins/pdb_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/pdf_input.py b/src/calibre/ebooks/conversion/plugins/pdf_input.py
index f5eab986e6..792623e752 100644
--- a/src/calibre/ebooks/conversion/plugins/pdf_input.py
+++ b/src/calibre/ebooks/conversion/plugins/pdf_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/pdf_output.py b/src/calibre/ebooks/conversion/plugins/pdf_output.py
index b212e0bdbf..cb26fd0b18 100644
--- a/src/calibre/ebooks/conversion/plugins/pdf_output.py
+++ b/src/calibre/ebooks/conversion/plugins/pdf_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/pml_input.py b/src/calibre/ebooks/conversion/plugins/pml_input.py
index 927b7747df..78fd8791ef 100644
--- a/src/calibre/ebooks/conversion/plugins/pml_input.py
+++ b/src/calibre/ebooks/conversion/plugins/pml_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/pml_output.py b/src/calibre/ebooks/conversion/plugins/pml_output.py
index 2876c07555..4daf944d75 100644
--- a/src/calibre/ebooks/conversion/plugins/pml_output.py
+++ b/src/calibre/ebooks/conversion/plugins/pml_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/rb_input.py b/src/calibre/ebooks/conversion/plugins/rb_input.py
index f8a0377df5..68d072da9a 100644
--- a/src/calibre/ebooks/conversion/plugins/rb_input.py
+++ b/src/calibre/ebooks/conversion/plugins/rb_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/rb_output.py b/src/calibre/ebooks/conversion/plugins/rb_output.py
index 4ddfd29085..6a83f0c91d 100644
--- a/src/calibre/ebooks/conversion/plugins/rb_output.py
+++ b/src/calibre/ebooks/conversion/plugins/rb_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/recipe_input.py b/src/calibre/ebooks/conversion/plugins/recipe_input.py
index fb55c01e9d..ca3ba5b1b0 100644
--- a/src/calibre/ebooks/conversion/plugins/recipe_input.py
+++ b/src/calibre/ebooks/conversion/plugins/recipe_input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/plugins/rtf_input.py b/src/calibre/ebooks/conversion/plugins/rtf_input.py
index 952898d1d0..b09e48e83e 100644
--- a/src/calibre/ebooks/conversion/plugins/rtf_input.py
+++ b/src/calibre/ebooks/conversion/plugins/rtf_input.py
@@ -1,4 +1,4 @@
-from __future__ import with_statement, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
diff --git a/src/calibre/ebooks/conversion/plugins/rtf_output.py b/src/calibre/ebooks/conversion/plugins/rtf_output.py
index bafb67c9f9..e8b40b53e8 100644
--- a/src/calibre/ebooks/conversion/plugins/rtf_output.py
+++ b/src/calibre/ebooks/conversion/plugins/rtf_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/snb_input.py b/src/calibre/ebooks/conversion/plugins/snb_input.py
index 23ac302e1c..f92b36e553 100644
--- a/src/calibre/ebooks/conversion/plugins/snb_input.py
+++ b/src/calibre/ebooks/conversion/plugins/snb_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Li Fanxi <lifanxi@freemindworld.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/snb_output.py b/src/calibre/ebooks/conversion/plugins/snb_output.py
index 460e806999..3dd9aace8c 100644
--- a/src/calibre/ebooks/conversion/plugins/snb_output.py
+++ b/src/calibre/ebooks/conversion/plugins/snb_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Li Fanxi <lifanxi@freemindworld.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/tcr_input.py b/src/calibre/ebooks/conversion/plugins/tcr_input.py
index e996715f91..3b2f33551c 100644
--- a/src/calibre/ebooks/conversion/plugins/tcr_input.py
+++ b/src/calibre/ebooks/conversion/plugins/tcr_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/tcr_output.py b/src/calibre/ebooks/conversion/plugins/tcr_output.py
index a49627f65e..a697966fc9 100644
--- a/src/calibre/ebooks/conversion/plugins/tcr_output.py
+++ b/src/calibre/ebooks/conversion/plugins/tcr_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/txt_input.py b/src/calibre/ebooks/conversion/plugins/txt_input.py
index ded07e0e13..a2794813e0 100644
--- a/src/calibre/ebooks/conversion/plugins/txt_input.py
+++ b/src/calibre/ebooks/conversion/plugins/txt_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plugins/txt_output.py b/src/calibre/ebooks/conversion/plugins/txt_output.py
index d9328691bf..ef1b3dbad1 100644
--- a/src/calibre/ebooks/conversion/plugins/txt_output.py
+++ b/src/calibre/ebooks/conversion/plugins/txt_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/conversion/plumber.py b/src/calibre/ebooks/conversion/plumber.py
index a9720505a9..77dedb13b7 100644
--- a/src/calibre/ebooks/conversion/plumber.py
+++ b/src/calibre/ebooks/conversion/plumber.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/preprocess.py b/src/calibre/ebooks/conversion/preprocess.py
index 4f2a8ce52e..e3e6983742 100644
--- a/src/calibre/ebooks/conversion/preprocess.py
+++ b/src/calibre/ebooks/conversion/preprocess.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/conversion/search_replace.py b/src/calibre/ebooks/conversion/search_replace.py
index 27fd2c395f..f7226fa2a2 100644
--- a/src/calibre/ebooks/conversion/search_replace.py
+++ b/src/calibre/ebooks/conversion/search_replace.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import regex
 
diff --git a/src/calibre/ebooks/conversion/utils.py b/src/calibre/ebooks/conversion/utils.py
index 4d23933a98..3bff52730a 100644
--- a/src/calibre/ebooks/conversion/utils.py
+++ b/src/calibre/ebooks/conversion/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/covers.py b/src/calibre/ebooks/covers.py
index 7d3c428e4a..3d401932f2 100644
--- a/src/calibre/ebooks/covers.py
+++ b/src/calibre/ebooks/covers.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/css_transform_rules.py b/src/calibre/ebooks/css_transform_rules.py
index 9d2cd2ec84..136bdab4e2 100644
--- a/src/calibre/ebooks/css_transform_rules.py
+++ b/src/calibre/ebooks/css_transform_rules.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from functools import partial
 from collections import OrderedDict
diff --git a/src/calibre/ebooks/djvu/__init__.py b/src/calibre/ebooks/djvu/__init__.py
index 5d3a0cd140..1d58fcfdd7 100644
--- a/src/calibre/ebooks/djvu/__init__.py
+++ b/src/calibre/ebooks/djvu/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Anthon van der Neut <anthon@mnt.org>'
diff --git a/src/calibre/ebooks/djvu/djvu.py b/src/calibre/ebooks/djvu/djvu.py
index fa58f8fc49..fc73178aba 100644
--- a/src/calibre/ebooks/djvu/djvu.py
+++ b/src/calibre/ebooks/djvu/djvu.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # coding: utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Anthon van der Neut <A.van.der.Neut@ruamel.eu>'
diff --git a/src/calibre/ebooks/djvu/djvubzzdec.py b/src/calibre/ebooks/djvu/djvubzzdec.py
index a4ac518976..135e6d1cf4 100644
--- a/src/calibre/ebooks/djvu/djvubzzdec.py
+++ b/src/calibre/ebooks/djvu/djvubzzdec.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # coding: utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import range
 
diff --git a/src/calibre/ebooks/docx/__init__.py b/src/calibre/ebooks/docx/__init__.py
index 57bfd7d760..5572220196 100644
--- a/src/calibre/ebooks/docx/__init__.py
+++ b/src/calibre/ebooks/docx/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/block_styles.py b/src/calibre/ebooks/docx/block_styles.py
index 96ae080c05..413e27c731 100644
--- a/src/calibre/ebooks/docx/block_styles.py
+++ b/src/calibre/ebooks/docx/block_styles.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/char_styles.py b/src/calibre/ebooks/docx/char_styles.py
index 61d13c7809..d82715e341 100644
--- a/src/calibre/ebooks/docx/char_styles.py
+++ b/src/calibre/ebooks/docx/char_styles.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/cleanup.py b/src/calibre/ebooks/docx/cleanup.py
index c68feb4736..983133200d 100644
--- a/src/calibre/ebooks/docx/cleanup.py
+++ b/src/calibre/ebooks/docx/cleanup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/container.py b/src/calibre/ebooks/docx/container.py
index 9411e20780..5494cee916 100644
--- a/src/calibre/ebooks/docx/container.py
+++ b/src/calibre/ebooks/docx/container.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/dump.py b/src/calibre/ebooks/docx/dump.py
index 726c29feef..c4191057bb 100644
--- a/src/calibre/ebooks/docx/dump.py
+++ b/src/calibre/ebooks/docx/dump.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/fields.py b/src/calibre/ebooks/docx/fields.py
index 8ff5d28859..445c6c5dad 100644
--- a/src/calibre/ebooks/docx/fields.py
+++ b/src/calibre/ebooks/docx/fields.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/fonts.py b/src/calibre/ebooks/docx/fonts.py
index bd0ad51bc0..4d85968272 100644
--- a/src/calibre/ebooks/docx/fonts.py
+++ b/src/calibre/ebooks/docx/fonts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/footnotes.py b/src/calibre/ebooks/docx/footnotes.py
index 22f8ed82d4..d8c6b73468 100644
--- a/src/calibre/ebooks/docx/footnotes.py
+++ b/src/calibre/ebooks/docx/footnotes.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/images.py b/src/calibre/ebooks/docx/images.py
index b82cf6fa9c..31ca932ed9 100644
--- a/src/calibre/ebooks/docx/images.py
+++ b/src/calibre/ebooks/docx/images.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/index.py b/src/calibre/ebooks/docx/index.py
index 38b8431dc0..c9db68004d 100644
--- a/src/calibre/ebooks/docx/index.py
+++ b/src/calibre/ebooks/docx/index.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/lcid.py b/src/calibre/ebooks/docx/lcid.py
index f9de87eb84..1e365f0321 100644
--- a/src/calibre/ebooks/docx/lcid.py
+++ b/src/calibre/ebooks/docx/lcid.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/names.py b/src/calibre/ebooks/docx/names.py
index 039bc5b80e..22a362710b 100644
--- a/src/calibre/ebooks/docx/names.py
+++ b/src/calibre/ebooks/docx/names.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/numbering.py b/src/calibre/ebooks/docx/numbering.py
index 294c627935..65738a29b6 100644
--- a/src/calibre/ebooks/docx/numbering.py
+++ b/src/calibre/ebooks/docx/numbering.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/settings.py b/src/calibre/ebooks/docx/settings.py
index 6271692433..adc0060ddd 100644
--- a/src/calibre/ebooks/docx/settings.py
+++ b/src/calibre/ebooks/docx/settings.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/styles.py b/src/calibre/ebooks/docx/styles.py
index d3f0f8db5f..16eb391241 100644
--- a/src/calibre/ebooks/docx/styles.py
+++ b/src/calibre/ebooks/docx/styles.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/tables.py b/src/calibre/ebooks/docx/tables.py
index 01f5995975..1e7b108ec4 100644
--- a/src/calibre/ebooks/docx/tables.py
+++ b/src/calibre/ebooks/docx/tables.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/theme.py b/src/calibre/ebooks/docx/theme.py
index 3f0fc5db1f..cbd7367f14 100644
--- a/src/calibre/ebooks/docx/theme.py
+++ b/src/calibre/ebooks/docx/theme.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/to_html.py b/src/calibre/ebooks/docx/to_html.py
index eb9c9087f0..4113d855c1 100644
--- a/src/calibre/ebooks/docx/to_html.py
+++ b/src/calibre/ebooks/docx/to_html.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/toc.py b/src/calibre/ebooks/docx/toc.py
index 0bec436eda..0fb2e7ea8b 100644
--- a/src/calibre/ebooks/docx/toc.py
+++ b/src/calibre/ebooks/docx/toc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/__init__.py b/src/calibre/ebooks/docx/writer/__init__.py
index 69376f9ebd..e4102b4b10 100644
--- a/src/calibre/ebooks/docx/writer/__init__.py
+++ b/src/calibre/ebooks/docx/writer/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/container.py b/src/calibre/ebooks/docx/writer/container.py
index 08262a4fe7..eff0f2bffa 100644
--- a/src/calibre/ebooks/docx/writer/container.py
+++ b/src/calibre/ebooks/docx/writer/container.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/fonts.py b/src/calibre/ebooks/docx/writer/fonts.py
index 559613c38d..25ad2738f8 100644
--- a/src/calibre/ebooks/docx/writer/fonts.py
+++ b/src/calibre/ebooks/docx/writer/fonts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/from_html.py b/src/calibre/ebooks/docx/writer/from_html.py
index 8a3dfb84c6..76274cfd90 100644
--- a/src/calibre/ebooks/docx/writer/from_html.py
+++ b/src/calibre/ebooks/docx/writer/from_html.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/images.py b/src/calibre/ebooks/docx/writer/images.py
index d0066022da..a98f462267 100644
--- a/src/calibre/ebooks/docx/writer/images.py
+++ b/src/calibre/ebooks/docx/writer/images.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/links.py b/src/calibre/ebooks/docx/writer/links.py
index 640f0d44cb..d45405acb0 100644
--- a/src/calibre/ebooks/docx/writer/links.py
+++ b/src/calibre/ebooks/docx/writer/links.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/lists.py b/src/calibre/ebooks/docx/writer/lists.py
index c7649480cc..4118bfbcd1 100644
--- a/src/calibre/ebooks/docx/writer/lists.py
+++ b/src/calibre/ebooks/docx/writer/lists.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/styles.py b/src/calibre/ebooks/docx/writer/styles.py
index dfd6939a1c..6b832e3273 100644
--- a/src/calibre/ebooks/docx/writer/styles.py
+++ b/src/calibre/ebooks/docx/writer/styles.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/tables.py b/src/calibre/ebooks/docx/writer/tables.py
index 12cb981064..7f16295148 100644
--- a/src/calibre/ebooks/docx/writer/tables.py
+++ b/src/calibre/ebooks/docx/writer/tables.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/docx/writer/utils.py b/src/calibre/ebooks/docx/writer/utils.py
index b8a18cf78f..a05ea69062 100644
--- a/src/calibre/ebooks/docx/writer/utils.py
+++ b/src/calibre/ebooks/docx/writer/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/epub/__init__.py b/src/calibre/ebooks/epub/__init__.py
index 4629218f4a..02cad97ff5 100644
--- a/src/calibre/ebooks/epub/__init__.py
+++ b/src/calibre/ebooks/epub/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/epub/cfi/parse.py b/src/calibre/ebooks/epub/cfi/parse.py
index f9e5fc89fd..cbcd3bf78b 100644
--- a/src/calibre/ebooks/epub/cfi/parse.py
+++ b/src/calibre/ebooks/epub/cfi/parse.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/epub/cfi/tests.py b/src/calibre/ebooks/epub/cfi/tests.py
index 40e8ec62c1..5ebce70935 100644
--- a/src/calibre/ebooks/epub/cfi/tests.py
+++ b/src/calibre/ebooks/epub/cfi/tests.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/epub/pages.py b/src/calibre/ebooks/epub/pages.py
index 613821337e..d1eb64d90e 100644
--- a/src/calibre/ebooks/epub/pages.py
+++ b/src/calibre/ebooks/epub/pages.py
@@ -2,7 +2,7 @@
 Add page mapping information to an EPUB book.
 '''
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/epub/periodical.py b/src/calibre/ebooks/epub/periodical.py
index b5acc4a03e..97fb17ccdb 100644
--- a/src/calibre/ebooks/epub/periodical.py
+++ b/src/calibre/ebooks/epub/periodical.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/fb2/__init__.py b/src/calibre/ebooks/fb2/__init__.py
index 7f70b39cff..c623df2d9c 100644
--- a/src/calibre/ebooks/fb2/__init__.py
+++ b/src/calibre/ebooks/fb2/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/fb2/fb2ml.py b/src/calibre/ebooks/fb2/fb2ml.py
index d8a0098fb2..46e52fdd13 100644
--- a/src/calibre/ebooks/fb2/fb2ml.py
+++ b/src/calibre/ebooks/fb2/fb2ml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/html/__init__.py b/src/calibre/ebooks/html/__init__.py
index a9b056d940..d8edc6064a 100644
--- a/src/calibre/ebooks/html/__init__.py
+++ b/src/calibre/ebooks/html/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/html/input.py b/src/calibre/ebooks/html/input.py
index 80ad1f84ab..8e85b23dde 100644
--- a/src/calibre/ebooks/html/input.py
+++ b/src/calibre/ebooks/html/input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/html/meta.py b/src/calibre/ebooks/html/meta.py
index 7cc9010a38..5d542382aa 100644
--- a/src/calibre/ebooks/html/meta.py
+++ b/src/calibre/ebooks/html/meta.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Fabian Grassl <fg@jusmeum.de>'
diff --git a/src/calibre/ebooks/html/to_zip.py b/src/calibre/ebooks/html/to_zip.py
index 4a0173f947..c205e0cc8c 100644
--- a/src/calibre/ebooks/html/to_zip.py
+++ b/src/calibre/ebooks/html/to_zip.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/html_entities.py b/src/calibre/ebooks/html_entities.py
index 18ff8ad7e6..265ebe10c0 100644
--- a/src/calibre/ebooks/html_entities.py
+++ b/src/calibre/ebooks/html_entities.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 html5_entities = {
 # ENTITY_DATA {{{
diff --git a/src/calibre/ebooks/htmlz/oeb2html.py b/src/calibre/ebooks/htmlz/oeb2html.py
index b99f3fe40b..71bbafc41d 100644
--- a/src/calibre/ebooks/htmlz/oeb2html.py
+++ b/src/calibre/ebooks/htmlz/oeb2html.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/ebooks/hyphenate.py b/src/calibre/ebooks/hyphenate.py
index a244151739..5815c68b96 100644
--- a/src/calibre/ebooks/hyphenate.py
+++ b/src/calibre/ebooks/hyphenate.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """ Hyphenation, using Frank Liang's algorithm.
 
diff --git a/src/calibre/ebooks/iterator/__init__.py b/src/calibre/ebooks/iterator/__init__.py
index 3e2240e94d..c227aeaca5 100644
--- a/src/calibre/ebooks/iterator/__init__.py
+++ b/src/calibre/ebooks/iterator/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lit/__init__.py b/src/calibre/ebooks/lit/__init__.py
index 3a4904f419..98e16efde0 100644
--- a/src/calibre/ebooks/lit/__init__.py
+++ b/src/calibre/ebooks/lit/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/lit/lzx.py b/src/calibre/ebooks/lit/lzx.py
index aea602f6f9..3995bb9023 100644
--- a/src/calibre/ebooks/lit/lzx.py
+++ b/src/calibre/ebooks/lit/lzx.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 LZX compression/decompression wrapper.
diff --git a/src/calibre/ebooks/lit/maps/__init__.py b/src/calibre/ebooks/lit/maps/__init__.py
index e9997944e5..47b1ac0be1 100644
--- a/src/calibre/ebooks/lit/maps/__init__.py
+++ b/src/calibre/ebooks/lit/maps/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/lit/maps/html.py b/src/calibre/ebooks/lit/maps/html.py
index 9502092779..2b294242eb 100644
--- a/src/calibre/ebooks/lit/maps/html.py
+++ b/src/calibre/ebooks/lit/maps/html.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/lit/maps/opf.py b/src/calibre/ebooks/lit/maps/opf.py
index 8f5626842b..94882c7de2 100644
--- a/src/calibre/ebooks/lit/maps/opf.py
+++ b/src/calibre/ebooks/lit/maps/opf.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/lit/mssha1.py b/src/calibre/ebooks/lit/mssha1.py
index 7c82a561de..e94096f5bf 100644
--- a/src/calibre/ebooks/lit/mssha1.py
+++ b/src/calibre/ebooks/lit/mssha1.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 """
 Modified version of SHA-1 used in Microsoft LIT files.
 
diff --git a/src/calibre/ebooks/lit/reader.py b/src/calibre/ebooks/lit/reader.py
index 86b0b94b3b..367daf3042 100644
--- a/src/calibre/ebooks/lit/reader.py
+++ b/src/calibre/ebooks/lit/reader.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Support for reading LIT files.
 '''
diff --git a/src/calibre/ebooks/lit/writer.py b/src/calibre/ebooks/lit/writer.py
index 534570fd19..f37de4cc02 100644
--- a/src/calibre/ebooks/lit/writer.py
+++ b/src/calibre/ebooks/lit/writer.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Basic support for writing LIT files.
 '''
diff --git a/src/calibre/ebooks/lrf/__init__.py b/src/calibre/ebooks/lrf/__init__.py
index 6be9e69e13..58015b118d 100644
--- a/src/calibre/ebooks/lrf/__init__.py
+++ b/src/calibre/ebooks/lrf/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/fonts.py b/src/calibre/ebooks/lrf/fonts.py
index 0cbff70503..6c4bee40ce 100644
--- a/src/calibre/ebooks/lrf/fonts.py
+++ b/src/calibre/ebooks/lrf/fonts.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/html/__init__.py b/src/calibre/ebooks/lrf/html/__init__.py
index cb4d4686eb..108bfed51c 100644
--- a/src/calibre/ebooks/lrf/html/__init__.py
+++ b/src/calibre/ebooks/lrf/html/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/html/color_map.py b/src/calibre/ebooks/lrf/html/color_map.py
index ce4af2d71d..2443b914c2 100644
--- a/src/calibre/ebooks/lrf/html/color_map.py
+++ b/src/calibre/ebooks/lrf/html/color_map.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/html/convert_from.py b/src/calibre/ebooks/lrf/html/convert_from.py
index 285acc3bde..7f95ef2d63 100644
--- a/src/calibre/ebooks/lrf/html/convert_from.py
+++ b/src/calibre/ebooks/lrf/html/convert_from.py
@@ -1,6 +1,6 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import copy
 import glob
diff --git a/src/calibre/ebooks/lrf/html/table.py b/src/calibre/ebooks/lrf/html/table.py
index 3542056988..eaa1d75d99 100644
--- a/src/calibre/ebooks/lrf/html/table.py
+++ b/src/calibre/ebooks/lrf/html/table.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/input.py b/src/calibre/ebooks/lrf/input.py
index 108f2dfc05..aff106875d 100644
--- a/src/calibre/ebooks/lrf/input.py
+++ b/src/calibre/ebooks/lrf/input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/lrfparser.py b/src/calibre/ebooks/lrf/lrfparser.py
index 923630c9c1..ed103b1e51 100644
--- a/src/calibre/ebooks/lrf/lrfparser.py
+++ b/src/calibre/ebooks/lrf/lrfparser.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/lrs/__init__.py b/src/calibre/ebooks/lrf/lrs/__init__.py
index 205df68b90..eca3b37146 100644
--- a/src/calibre/ebooks/lrf/lrs/__init__.py
+++ b/src/calibre/ebooks/lrf/lrs/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/lrs/convert_from.py b/src/calibre/ebooks/lrf/lrs/convert_from.py
index cb53ad23ce..0202563073 100644
--- a/src/calibre/ebooks/lrf/lrs/convert_from.py
+++ b/src/calibre/ebooks/lrf/lrs/convert_from.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/meta.py b/src/calibre/ebooks/lrf/meta.py
index f76ba91d01..48d000ee68 100644
--- a/src/calibre/ebooks/lrf/meta.py
+++ b/src/calibre/ebooks/lrf/meta.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/objects.py b/src/calibre/ebooks/lrf/objects.py
index 67b0b77642..1d9de79a3a 100644
--- a/src/calibre/ebooks/lrf/objects.py
+++ b/src/calibre/ebooks/lrf/objects.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/lrf/pylrs/__init__.py b/src/calibre/ebooks/lrf/pylrs/__init__.py
index 72b8c8d968..c7354ae57b 100644
--- a/src/calibre/ebooks/lrf/pylrs/__init__.py
+++ b/src/calibre/ebooks/lrf/pylrs/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """
 This package contains code to generate ebooks in the SONY LRS/F format. It was
diff --git a/src/calibre/ebooks/lrf/pylrs/elements.py b/src/calibre/ebooks/lrf/pylrs/elements.py
index fa2b8a0b21..9e5042266d 100644
--- a/src/calibre/ebooks/lrf/pylrs/elements.py
+++ b/src/calibre/ebooks/lrf/pylrs/elements.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """ elements.py -- replacements and helpers for ElementTree """
 
diff --git a/src/calibre/ebooks/lrf/pylrs/pylrf.py b/src/calibre/ebooks/lrf/pylrs/pylrf.py
index 16aa0d730b..d514d359dd 100644
--- a/src/calibre/ebooks/lrf/pylrs/pylrf.py
+++ b/src/calibre/ebooks/lrf/pylrs/pylrf.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """
     pylrf.py -- very low level interface to create lrf files.  See pylrs for
diff --git a/src/calibre/ebooks/lrf/pylrs/pylrfopt.py b/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
index b9a1e8101a..1ddf80d556 100644
--- a/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
+++ b/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 def _optimize(tagList, tagName, conversion):
diff --git a/src/calibre/ebooks/lrf/pylrs/pylrs.py b/src/calibre/ebooks/lrf/pylrs/pylrs.py
index 8816cbc311..3be64978a9 100644
--- a/src/calibre/ebooks/lrf/pylrs/pylrs.py
+++ b/src/calibre/ebooks/lrf/pylrs/pylrs.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 # Copyright (c) 2007 Mike Higgins (Falstaff)
 # Modifications from the original:
diff --git a/src/calibre/ebooks/lrf/tags.py b/src/calibre/ebooks/lrf/tags.py
index 5f36ca950d..0586b06161 100644
--- a/src/calibre/ebooks/lrf/tags.py
+++ b/src/calibre/ebooks/lrf/tags.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/__init__.py b/src/calibre/ebooks/metadata/__init__.py
index f51eb17725..609918588e 100644
--- a/src/calibre/ebooks/metadata/__init__.py
+++ b/src/calibre/ebooks/metadata/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/metadata/archive.py b/src/calibre/ebooks/metadata/archive.py
index 2b5e52916e..b04c1bdb35 100644
--- a/src/calibre/ebooks/metadata/archive.py
+++ b/src/calibre/ebooks/metadata/archive.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/author_mapper.py b/src/calibre/ebooks/metadata/author_mapper.py
index faeb3b2728..922ca7770c 100644
--- a/src/calibre/ebooks/metadata/author_mapper.py
+++ b/src/calibre/ebooks/metadata/author_mapper.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re
 from collections import deque
diff --git a/src/calibre/ebooks/metadata/book/__init__.py b/src/calibre/ebooks/metadata/book/__init__.py
index 59aedfd267..794f0c87b2 100644
--- a/src/calibre/ebooks/metadata/book/__init__.py
+++ b/src/calibre/ebooks/metadata/book/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/book/base.py b/src/calibre/ebooks/metadata/book/base.py
index f6534ad564..a33e2ad91b 100644
--- a/src/calibre/ebooks/metadata/book/base.py
+++ b/src/calibre/ebooks/metadata/book/base.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/book/formatter.py b/src/calibre/ebooks/metadata/book/formatter.py
index 17fe32ddc0..7edba76fb2 100644
--- a/src/calibre/ebooks/metadata/book/formatter.py
+++ b/src/calibre/ebooks/metadata/book/formatter.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/book/json_codec.py b/src/calibre/ebooks/metadata/book/json_codec.py
index 7df3b8be98..2eb23a6d0e 100644
--- a/src/calibre/ebooks/metadata/book/json_codec.py
+++ b/src/calibre/ebooks/metadata/book/json_codec.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Created on 4 Jun 2010
diff --git a/src/calibre/ebooks/metadata/book/render.py b/src/calibre/ebooks/metadata/book/render.py
index 3dd6d72ce3..f5b94368c8 100644
--- a/src/calibre/ebooks/metadata/book/render.py
+++ b/src/calibre/ebooks/metadata/book/render.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/book/serialize.py b/src/calibre/ebooks/metadata/book/serialize.py
index 41f4caf7bf..12a76c18dc 100644
--- a/src/calibre/ebooks/metadata/book/serialize.py
+++ b/src/calibre/ebooks/metadata/book/serialize.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 from calibre.constants import preferred_encoding
diff --git a/src/calibre/ebooks/metadata/cli.py b/src/calibre/ebooks/metadata/cli.py
index 3b88027861..15b9612602 100644
--- a/src/calibre/ebooks/metadata/cli.py
+++ b/src/calibre/ebooks/metadata/cli.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/metadata/docx.py b/src/calibre/ebooks/metadata/docx.py
index 054f774d48..aceb41addc 100644
--- a/src/calibre/ebooks/metadata/docx.py
+++ b/src/calibre/ebooks/metadata/docx.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/epub.py b/src/calibre/ebooks/metadata/epub.py
index c23ee7e028..8fb7b01493 100644
--- a/src/calibre/ebooks/metadata/epub.py
+++ b/src/calibre/ebooks/metadata/epub.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/ereader.py b/src/calibre/ebooks/metadata/ereader.py
index 1d516e3382..76a2f5860a 100644
--- a/src/calibre/ebooks/metadata/ereader.py
+++ b/src/calibre/ebooks/metadata/ereader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read meta information from eReader pdb files.
diff --git a/src/calibre/ebooks/metadata/extz.py b/src/calibre/ebooks/metadata/extz.py
index 771ae83c03..9ada262840 100644
--- a/src/calibre/ebooks/metadata/extz.py
+++ b/src/calibre/ebooks/metadata/extz.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/metadata/fb2.py b/src/calibre/ebooks/metadata/fb2.py
index 4473c87e96..5367eaea42 100644
--- a/src/calibre/ebooks/metadata/fb2.py
+++ b/src/calibre/ebooks/metadata/fb2.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Roman Mukhin <ramses_ru at hotmail.com>, '\
diff --git a/src/calibre/ebooks/metadata/haodoo.py b/src/calibre/ebooks/metadata/haodoo.py
index a5be356682..25c357682e 100644
--- a/src/calibre/ebooks/metadata/haodoo.py
+++ b/src/calibre/ebooks/metadata/haodoo.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read meta information from Haodoo.net pdb files.
diff --git a/src/calibre/ebooks/metadata/html.py b/src/calibre/ebooks/metadata/html.py
index 1ebcf76d32..abaa230eb7 100644
--- a/src/calibre/ebooks/metadata/html.py
+++ b/src/calibre/ebooks/metadata/html.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/imp.py b/src/calibre/ebooks/metadata/imp.py
index 7dc0378475..d026168b5d 100644
--- a/src/calibre/ebooks/metadata/imp.py
+++ b/src/calibre/ebooks/metadata/imp.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Ashish Kulkarni <kulkarni.ashish@gmail.com>'
diff --git a/src/calibre/ebooks/metadata/kdl.py b/src/calibre/ebooks/metadata/kdl.py
index 33362a9c68..104894b514 100644
--- a/src/calibre/ebooks/metadata/kdl.py
+++ b/src/calibre/ebooks/metadata/kdl.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/kfx.py b/src/calibre/ebooks/metadata/kfx.py
index 46472d6f54..7de15265af 100644
--- a/src/calibre/ebooks/metadata/kfx.py
+++ b/src/calibre/ebooks/metadata/kfx.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>, John Howell <jhowell@acm.org>'
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 # Based on work of John Howell reversing the KFX format
 # https://www.mobileread.com/forums/showpost.php?p=3176029&postcount=89
diff --git a/src/calibre/ebooks/metadata/lit.py b/src/calibre/ebooks/metadata/lit.py
index cd197f9941..3492bdba4f 100644
--- a/src/calibre/ebooks/metadata/lit.py
+++ b/src/calibre/ebooks/metadata/lit.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/lrx.py b/src/calibre/ebooks/metadata/lrx.py
index 0e0f900507..71d631cf02 100644
--- a/src/calibre/ebooks/metadata/lrx.py
+++ b/src/calibre/ebooks/metadata/lrx.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/metadata/meta.py b/src/calibre/ebooks/metadata/meta.py
index f1dcc5d7c2..8a1e1fa512 100644
--- a/src/calibre/ebooks/metadata/meta.py
+++ b/src/calibre/ebooks/metadata/meta.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/mobi.py b/src/calibre/ebooks/metadata/mobi.py
index 407aadf33f..143af8f332 100644
--- a/src/calibre/ebooks/metadata/mobi.py
+++ b/src/calibre/ebooks/metadata/mobi.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2009, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import io
 import numbers
diff --git a/src/calibre/ebooks/metadata/odt.py b/src/calibre/ebooks/metadata/odt.py
index a9adb766b0..5673f6c47c 100644
--- a/src/calibre/ebooks/metadata/odt.py
+++ b/src/calibre/ebooks/metadata/odt.py
@@ -18,7 +18,7 @@
 #
 # Contributor(s):
 #
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import io
 import json
diff --git a/src/calibre/ebooks/metadata/opf.py b/src/calibre/ebooks/metadata/opf.py
index 0cd6c68b13..081af8f140 100644
--- a/src/calibre/ebooks/metadata/opf.py
+++ b/src/calibre/ebooks/metadata/opf.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from lxml import etree
 
diff --git a/src/calibre/ebooks/metadata/opf2.py b/src/calibre/ebooks/metadata/opf2.py
index 8d2f8a3012..792cb1c550 100644
--- a/src/calibre/ebooks/metadata/opf2.py
+++ b/src/calibre/ebooks/metadata/opf2.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/metadata/opf3.py b/src/calibre/ebooks/metadata/opf3.py
index 9885b8ab12..4cad46c7af 100644
--- a/src/calibre/ebooks/metadata/opf3.py
+++ b/src/calibre/ebooks/metadata/opf3.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import re
diff --git a/src/calibre/ebooks/metadata/opf3_test.py b/src/calibre/ebooks/metadata/opf3_test.py
index de5c509904..b1a9dac4c4 100644
--- a/src/calibre/ebooks/metadata/opf3_test.py
+++ b/src/calibre/ebooks/metadata/opf3_test.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from collections import defaultdict
 from io import BytesIO
 import unittest
diff --git a/src/calibre/ebooks/metadata/opf_2_to_3.py b/src/calibre/ebooks/metadata/opf_2_to_3.py
index 26c4002404..601effd9f5 100644
--- a/src/calibre/ebooks/metadata/opf_2_to_3.py
+++ b/src/calibre/ebooks/metadata/opf_2_to_3.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from lxml import etree
 
diff --git a/src/calibre/ebooks/metadata/pdb.py b/src/calibre/ebooks/metadata/pdb.py
index 29a1b00018..d947502e4c 100644
--- a/src/calibre/ebooks/metadata/pdb.py
+++ b/src/calibre/ebooks/metadata/pdb.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read meta information from pdb files.
diff --git a/src/calibre/ebooks/metadata/pdf.py b/src/calibre/ebooks/metadata/pdf.py
index 4f7486db9d..fb2376d08d 100644
--- a/src/calibre/ebooks/metadata/pdf.py
+++ b/src/calibre/ebooks/metadata/pdf.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/plucker.py b/src/calibre/ebooks/metadata/plucker.py
index e9acca83be..3fe3b0e6ff 100644
--- a/src/calibre/ebooks/metadata/plucker.py
+++ b/src/calibre/ebooks/metadata/plucker.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 '''
diff --git a/src/calibre/ebooks/metadata/pml.py b/src/calibre/ebooks/metadata/pml.py
index 24b1108f0b..cab23eb411 100644
--- a/src/calibre/ebooks/metadata/pml.py
+++ b/src/calibre/ebooks/metadata/pml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/metadata/rar.py b/src/calibre/ebooks/metadata/rar.py
index b770f0d423..724ac579b5 100644
--- a/src/calibre/ebooks/metadata/rar.py
+++ b/src/calibre/ebooks/metadata/rar.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/metadata/rb.py b/src/calibre/ebooks/metadata/rb.py
index 5361a15517..9869f2cd30 100644
--- a/src/calibre/ebooks/metadata/rb.py
+++ b/src/calibre/ebooks/metadata/rb.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Ashish Kulkarni <kulkarni.ashish@gmail.com>'
diff --git a/src/calibre/ebooks/metadata/rtf.py b/src/calibre/ebooks/metadata/rtf.py
index e62fc293e2..b888f81844 100644
--- a/src/calibre/ebooks/metadata/rtf.py
+++ b/src/calibre/ebooks/metadata/rtf.py
@@ -5,7 +5,7 @@
 """
 Edit metadata in RTF files.
 """
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import codecs
 import re
 
diff --git a/src/calibre/ebooks/metadata/search_internet.py b/src/calibre/ebooks/metadata/search_internet.py
index 48dcbe908c..6a46b0daf9 100644
--- a/src/calibre/ebooks/metadata/search_internet.py
+++ b/src/calibre/ebooks/metadata/search_internet.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import iteritems
 from polyglot.urllib import quote, quote_plus
diff --git a/src/calibre/ebooks/metadata/snb.py b/src/calibre/ebooks/metadata/snb.py
index fc2aa47510..fee88a0d3b 100644
--- a/src/calibre/ebooks/metadata/snb.py
+++ b/src/calibre/ebooks/metadata/snb.py
@@ -1,6 +1,6 @@
 '''Read meta information from SNB files'''
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Li Fanxi <lifanxi@freemindworld.com>'
diff --git a/src/calibre/ebooks/metadata/tag_mapper.py b/src/calibre/ebooks/metadata/tag_mapper.py
index 808289efae..740733fc4e 100644
--- a/src/calibre/ebooks/metadata/tag_mapper.py
+++ b/src/calibre/ebooks/metadata/tag_mapper.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import deque
 
diff --git a/src/calibre/ebooks/metadata/toc.py b/src/calibre/ebooks/metadata/toc.py
index b04368a1d9..a0dccc2274 100644
--- a/src/calibre/ebooks/metadata/toc.py
+++ b/src/calibre/ebooks/metadata/toc.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/topaz.py b/src/calibre/ebooks/metadata/topaz.py
index 9ea6def0d5..6b29590022 100644
--- a/src/calibre/ebooks/metadata/topaz.py
+++ b/src/calibre/ebooks/metadata/topaz.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Greg Riker <griker@hotmail.com>'
diff --git a/src/calibre/ebooks/metadata/txt.py b/src/calibre/ebooks/metadata/txt.py
index 253d844de0..8c624053e5 100644
--- a/src/calibre/ebooks/metadata/txt.py
+++ b/src/calibre/ebooks/metadata/txt.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/metadata/utils.py b/src/calibre/ebooks/metadata/utils.py
index 4f7e89d363..3bfff79b38 100644
--- a/src/calibre/ebooks/metadata/utils.py
+++ b/src/calibre/ebooks/metadata/utils.py
@@ -2,8 +2,6 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
-
 from collections import namedtuple
 
 from calibre.ebooks.chardet import xml_to_unicode
diff --git a/src/calibre/ebooks/metadata/worker.py b/src/calibre/ebooks/metadata/worker.py
index 8b58325cbf..a54be67769 100644
--- a/src/calibre/ebooks/metadata/worker.py
+++ b/src/calibre/ebooks/metadata/worker.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/xisbn.py b/src/calibre/ebooks/metadata/xisbn.py
index 2e2095a6fc..1001321ebd 100644
--- a/src/calibre/ebooks/metadata/xisbn.py
+++ b/src/calibre/ebooks/metadata/xisbn.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/xmp.py b/src/calibre/ebooks/metadata/xmp.py
index 72c5b9a7d6..873f342366 100644
--- a/src/calibre/ebooks/metadata/xmp.py
+++ b/src/calibre/ebooks/metadata/xmp.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/metadata/zip.py b/src/calibre/ebooks/metadata/zip.py
index c3d85089e4..025e03e7f8 100644
--- a/src/calibre/ebooks/metadata/zip.py
+++ b/src/calibre/ebooks/metadata/zip.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/__init__.py b/src/calibre/ebooks/mobi/__init__.py
index 429c2be583..8c2c1b6db6 100644
--- a/src/calibre/ebooks/mobi/__init__.py
+++ b/src/calibre/ebooks/mobi/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/debug/__init__.py b/src/calibre/ebooks/mobi/debug/__init__.py
index 5643be08b8..bde05e4f59 100644
--- a/src/calibre/ebooks/mobi/debug/__init__.py
+++ b/src/calibre/ebooks/mobi/debug/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/debug/containers.py b/src/calibre/ebooks/mobi/debug/containers.py
index f1e01cd4e0..54721b5735 100644
--- a/src/calibre/ebooks/mobi/debug/containers.py
+++ b/src/calibre/ebooks/mobi/debug/containers.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/debug/headers.py b/src/calibre/ebooks/mobi/debug/headers.py
index 7cc39aa943..5130327ec4 100644
--- a/src/calibre/ebooks/mobi/debug/headers.py
+++ b/src/calibre/ebooks/mobi/debug/headers.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/debug/index.py b/src/calibre/ebooks/mobi/debug/index.py
index c9c320de46..778ec34185 100644
--- a/src/calibre/ebooks/mobi/debug/index.py
+++ b/src/calibre/ebooks/mobi/debug/index.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/debug/main.py b/src/calibre/ebooks/mobi/debug/main.py
index d82240d104..82cf818863 100644
--- a/src/calibre/ebooks/mobi/debug/main.py
+++ b/src/calibre/ebooks/mobi/debug/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/debug/mobi6.py b/src/calibre/ebooks/mobi/debug/mobi6.py
index c8958f4ebd..06a41018f4 100644
--- a/src/calibre/ebooks/mobi/debug/mobi6.py
+++ b/src/calibre/ebooks/mobi/debug/mobi6.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/debug/mobi8.py b/src/calibre/ebooks/mobi/debug/mobi8.py
index 0cccbc3552..c4deb83b02 100644
--- a/src/calibre/ebooks/mobi/debug/mobi8.py
+++ b/src/calibre/ebooks/mobi/debug/mobi8.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/huffcdic.py b/src/calibre/ebooks/mobi/huffcdic.py
index b69e4ec1cf..a8ef2bd975 100644
--- a/src/calibre/ebooks/mobi/huffcdic.py
+++ b/src/calibre/ebooks/mobi/huffcdic.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/langcodes.py b/src/calibre/ebooks/mobi/langcodes.py
index 5505504a9f..7f027de127 100644
--- a/src/calibre/ebooks/mobi/langcodes.py
+++ b/src/calibre/ebooks/mobi/langcodes.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/mobi/mobiml.py b/src/calibre/ebooks/mobi/mobiml.py
index 94c8114e85..432f78d027 100644
--- a/src/calibre/ebooks/mobi/mobiml.py
+++ b/src/calibre/ebooks/mobi/mobiml.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Transform XHTML/OPS-ish content into Mobipocket HTML 3.2.
diff --git a/src/calibre/ebooks/mobi/reader/__init__.py b/src/calibre/ebooks/mobi/reader/__init__.py
index 5f6c324bfc..6b2910c3df 100644
--- a/src/calibre/ebooks/mobi/reader/__init__.py
+++ b/src/calibre/ebooks/mobi/reader/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/reader/containers.py b/src/calibre/ebooks/mobi/reader/containers.py
index 614553ba8c..c0ba5a4a8d 100644
--- a/src/calibre/ebooks/mobi/reader/containers.py
+++ b/src/calibre/ebooks/mobi/reader/containers.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/reader/headers.py b/src/calibre/ebooks/mobi/reader/headers.py
index dcd2f384a1..4d63b800d8 100644
--- a/src/calibre/ebooks/mobi/reader/headers.py
+++ b/src/calibre/ebooks/mobi/reader/headers.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/reader/index.py b/src/calibre/ebooks/mobi/reader/index.py
index 4623958667..eda8e76f4b 100644
--- a/src/calibre/ebooks/mobi/reader/index.py
+++ b/src/calibre/ebooks/mobi/reader/index.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/reader/markup.py b/src/calibre/ebooks/mobi/reader/markup.py
index 099027fe61..0566ac64ec 100644
--- a/src/calibre/ebooks/mobi/reader/markup.py
+++ b/src/calibre/ebooks/mobi/reader/markup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/reader/mobi6.py b/src/calibre/ebooks/mobi/reader/mobi6.py
index add06c7fb4..5498d1714f 100644
--- a/src/calibre/ebooks/mobi/reader/mobi6.py
+++ b/src/calibre/ebooks/mobi/reader/mobi6.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/reader/mobi8.py b/src/calibre/ebooks/mobi/reader/mobi8.py
index 8d3dfbbbfa..e87c3369bc 100644
--- a/src/calibre/ebooks/mobi/reader/mobi8.py
+++ b/src/calibre/ebooks/mobi/reader/mobi8.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/reader/ncx.py b/src/calibre/ebooks/mobi/reader/ncx.py
index 132d7eadd7..37520378c2 100644
--- a/src/calibre/ebooks/mobi/reader/ncx.py
+++ b/src/calibre/ebooks/mobi/reader/ncx.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/tweak.py b/src/calibre/ebooks/mobi/tweak.py
index 6c213cfd5c..591c4cd528 100644
--- a/src/calibre/ebooks/mobi/tweak.py
+++ b/src/calibre/ebooks/mobi/tweak.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/utils.py b/src/calibre/ebooks/mobi/utils.py
index b64b16ded0..ff8c51f2cc 100644
--- a/src/calibre/ebooks/mobi/utils.py
+++ b/src/calibre/ebooks/mobi/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer2/__init__.py b/src/calibre/ebooks/mobi/writer2/__init__.py
index cdbcb90597..792a0f633e 100644
--- a/src/calibre/ebooks/mobi/writer2/__init__.py
+++ b/src/calibre/ebooks/mobi/writer2/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer2/indexer.py b/src/calibre/ebooks/mobi/writer2/indexer.py
index d8135a7041..0963bd0186 100644
--- a/src/calibre/ebooks/mobi/writer2/indexer.py
+++ b/src/calibre/ebooks/mobi/writer2/indexer.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer2/main.py b/src/calibre/ebooks/mobi/writer2/main.py
index 9b90db03f6..a4aa8988c9 100644
--- a/src/calibre/ebooks/mobi/writer2/main.py
+++ b/src/calibre/ebooks/mobi/writer2/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer2/resources.py b/src/calibre/ebooks/mobi/writer2/resources.py
index fc34e4efd8..33b1a17d80 100644
--- a/src/calibre/ebooks/mobi/writer2/resources.py
+++ b/src/calibre/ebooks/mobi/writer2/resources.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer2/serializer.py b/src/calibre/ebooks/mobi/writer2/serializer.py
index 0ba8d1ca5c..a09dca7a47 100644
--- a/src/calibre/ebooks/mobi/writer2/serializer.py
+++ b/src/calibre/ebooks/mobi/writer2/serializer.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/__init__.py b/src/calibre/ebooks/mobi/writer8/__init__.py
index 5f6c324bfc..6b2910c3df 100644
--- a/src/calibre/ebooks/mobi/writer8/__init__.py
+++ b/src/calibre/ebooks/mobi/writer8/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/cleanup.py b/src/calibre/ebooks/mobi/writer8/cleanup.py
index 3a4c63bb5a..f108b7e62e 100644
--- a/src/calibre/ebooks/mobi/writer8/cleanup.py
+++ b/src/calibre/ebooks/mobi/writer8/cleanup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/exth.py b/src/calibre/ebooks/mobi/writer8/exth.py
index 337f0d02d2..9f737456a0 100644
--- a/src/calibre/ebooks/mobi/writer8/exth.py
+++ b/src/calibre/ebooks/mobi/writer8/exth.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/header.py b/src/calibre/ebooks/mobi/writer8/header.py
index 53c26cf3f3..a07fe7f6a1 100644
--- a/src/calibre/ebooks/mobi/writer8/header.py
+++ b/src/calibre/ebooks/mobi/writer8/header.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/index.py b/src/calibre/ebooks/mobi/writer8/index.py
index 26d999eb49..87555502fb 100644
--- a/src/calibre/ebooks/mobi/writer8/index.py
+++ b/src/calibre/ebooks/mobi/writer8/index.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from polyglot.builtins import map
 
 __license__   = 'GPL v3'
diff --git a/src/calibre/ebooks/mobi/writer8/main.py b/src/calibre/ebooks/mobi/writer8/main.py
index 827c57c52d..edacc43ff8 100644
--- a/src/calibre/ebooks/mobi/writer8/main.py
+++ b/src/calibre/ebooks/mobi/writer8/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/mobi.py b/src/calibre/ebooks/mobi/writer8/mobi.py
index 1ebbe4fedc..d1c7460635 100644
--- a/src/calibre/ebooks/mobi/writer8/mobi.py
+++ b/src/calibre/ebooks/mobi/writer8/mobi.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/skeleton.py b/src/calibre/ebooks/mobi/writer8/skeleton.py
index cb5610a3c9..d560d7fe13 100644
--- a/src/calibre/ebooks/mobi/writer8/skeleton.py
+++ b/src/calibre/ebooks/mobi/writer8/skeleton.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/tbs.py b/src/calibre/ebooks/mobi/writer8/tbs.py
index c618d43c67..f5a28ea638 100644
--- a/src/calibre/ebooks/mobi/writer8/tbs.py
+++ b/src/calibre/ebooks/mobi/writer8/tbs.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/mobi/writer8/toc.py b/src/calibre/ebooks/mobi/writer8/toc.py
index 50218fdbaf..f8bd2855a2 100644
--- a/src/calibre/ebooks/mobi/writer8/toc.py
+++ b/src/calibre/ebooks/mobi/writer8/toc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/odt/__init__.py b/src/calibre/ebooks/odt/__init__.py
index 08118467a1..cf7aa05a2a 100644
--- a/src/calibre/ebooks/odt/__init__.py
+++ b/src/calibre/ebooks/odt/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/odt/input.py b/src/calibre/ebooks/odt/input.py
index 00121cfcb3..e5714b0250 100644
--- a/src/calibre/ebooks/odt/input.py
+++ b/src/calibre/ebooks/odt/input.py
@@ -1,4 +1,4 @@
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/oeb/__init__.py b/src/calibre/ebooks/oeb/__init__.py
index 57af3199b4..62cfe31800 100644
--- a/src/calibre/ebooks/oeb/__init__.py
+++ b/src/calibre/ebooks/oeb/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/oeb/base.py b/src/calibre/ebooks/oeb/base.py
index e415d0a84b..acc7876dcd 100644
--- a/src/calibre/ebooks/oeb/base.py
+++ b/src/calibre/ebooks/oeb/base.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Basic support for manipulating OEB 1.x/2.0 content and metadata.
 '''
diff --git a/src/calibre/ebooks/oeb/display/__init__.py b/src/calibre/ebooks/oeb/display/__init__.py
index 5f6c324bfc..6b2910c3df 100644
--- a/src/calibre/ebooks/oeb/display/__init__.py
+++ b/src/calibre/ebooks/oeb/display/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/display/webview.py b/src/calibre/ebooks/oeb/display/webview.py
index 6255d82459..c563009ddc 100644
--- a/src/calibre/ebooks/oeb/display/webview.py
+++ b/src/calibre/ebooks/oeb/display/webview.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/iterator/__init__.py b/src/calibre/ebooks/oeb/iterator/__init__.py
index a7aaee54d8..128613218e 100644
--- a/src/calibre/ebooks/oeb/iterator/__init__.py
+++ b/src/calibre/ebooks/oeb/iterator/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/iterator/book.py b/src/calibre/ebooks/oeb/iterator/book.py
index a3bd54c67d..3a9b987acc 100644
--- a/src/calibre/ebooks/oeb/iterator/book.py
+++ b/src/calibre/ebooks/oeb/iterator/book.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/iterator/bookmarks.py b/src/calibre/ebooks/oeb/iterator/bookmarks.py
index 7e69497012..09e621dae4 100644
--- a/src/calibre/ebooks/oeb/iterator/bookmarks.py
+++ b/src/calibre/ebooks/oeb/iterator/bookmarks.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/iterator/spine.py b/src/calibre/ebooks/oeb/iterator/spine.py
index fb1e0c096b..6260d107c6 100644
--- a/src/calibre/ebooks/oeb/iterator/spine.py
+++ b/src/calibre/ebooks/oeb/iterator/spine.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from polyglot.builtins import map, unicode_type
 
 __license__   = 'GPL v3'
diff --git a/src/calibre/ebooks/oeb/normalize_css.py b/src/calibre/ebooks/oeb/normalize_css.py
index cdbae020f3..f1481fb991 100644
--- a/src/calibre/ebooks/oeb/normalize_css.py
+++ b/src/calibre/ebooks/oeb/normalize_css.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/parse_utils.py b/src/calibre/ebooks/oeb/parse_utils.py
index 4a9726d5dd..b7e96a4b01 100644
--- a/src/calibre/ebooks/oeb/parse_utils.py
+++ b/src/calibre/ebooks/oeb/parse_utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/__init__.py b/src/calibre/ebooks/oeb/polish/__init__.py
index d26359eab9..409db9d8ca 100644
--- a/src/calibre/ebooks/oeb/polish/__init__.py
+++ b/src/calibre/ebooks/oeb/polish/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/cascade.py b/src/calibre/ebooks/oeb/polish/cascade.py
index d40fd07430..2475c906f9 100644
--- a/src/calibre/ebooks/oeb/polish/cascade.py
+++ b/src/calibre/ebooks/oeb/polish/cascade.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from collections import defaultdict, namedtuple
 from functools import partial
 from itertools import count
diff --git a/src/calibre/ebooks/oeb/polish/check/__init__.py b/src/calibre/ebooks/oeb/polish/check/__init__.py
index 69376f9ebd..e4102b4b10 100644
--- a/src/calibre/ebooks/oeb/polish/check/__init__.py
+++ b/src/calibre/ebooks/oeb/polish/check/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/check/base.py b/src/calibre/ebooks/oeb/polish/check/base.py
index db34c95a57..7f1b8b5eb2 100644
--- a/src/calibre/ebooks/oeb/polish/check/base.py
+++ b/src/calibre/ebooks/oeb/polish/check/base.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/check/fonts.py b/src/calibre/ebooks/oeb/polish/check/fonts.py
index 7fd393183a..c942436084 100644
--- a/src/calibre/ebooks/oeb/polish/check/fonts.py
+++ b/src/calibre/ebooks/oeb/polish/check/fonts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/check/images.py b/src/calibre/ebooks/oeb/polish/check/images.py
index 4923a23f0e..2ed25977d4 100644
--- a/src/calibre/ebooks/oeb/polish/check/images.py
+++ b/src/calibre/ebooks/oeb/polish/check/images.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/check/links.py b/src/calibre/ebooks/oeb/polish/check/links.py
index 7627432a78..5a03e5c734 100644
--- a/src/calibre/ebooks/oeb/polish/check/links.py
+++ b/src/calibre/ebooks/oeb/polish/check/links.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/check/main.py b/src/calibre/ebooks/oeb/polish/check/main.py
index 241bdfc246..e8d6ef05db 100644
--- a/src/calibre/ebooks/oeb/polish/check/main.py
+++ b/src/calibre/ebooks/oeb/polish/check/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/check/opf.py b/src/calibre/ebooks/oeb/polish/check/opf.py
index bb2d00cf96..e2827e0a37 100644
--- a/src/calibre/ebooks/oeb/polish/check/opf.py
+++ b/src/calibre/ebooks/oeb/polish/check/opf.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/check/parsing.py b/src/calibre/ebooks/oeb/polish/check/parsing.py
index f2df70ce3e..1473b00378 100644
--- a/src/calibre/ebooks/oeb/polish/check/parsing.py
+++ b/src/calibre/ebooks/oeb/polish/check/parsing.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/container.py b/src/calibre/ebooks/oeb/polish/container.py
index 4472324973..fffcd93603 100644
--- a/src/calibre/ebooks/oeb/polish/container.py
+++ b/src/calibre/ebooks/oeb/polish/container.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import hashlib
diff --git a/src/calibre/ebooks/oeb/polish/cover.py b/src/calibre/ebooks/oeb/polish/cover.py
index 205b486f2d..44f9ea6792 100644
--- a/src/calibre/ebooks/oeb/polish/cover.py
+++ b/src/calibre/ebooks/oeb/polish/cover.py
@@ -1,5 +1,5 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/create.py b/src/calibre/ebooks/oeb/polish/create.py
index e10dd2490d..03fc894b01 100644
--- a/src/calibre/ebooks/oeb/polish/create.py
+++ b/src/calibre/ebooks/oeb/polish/create.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/css.py b/src/calibre/ebooks/oeb/polish/css.py
index 6fb376e97c..3e228a5b68 100644
--- a/src/calibre/ebooks/oeb/polish/css.py
+++ b/src/calibre/ebooks/oeb/polish/css.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/download.py b/src/calibre/ebooks/oeb/polish/download.py
index 794eacbf19..fa5891fbd1 100644
--- a/src/calibre/ebooks/oeb/polish/download.py
+++ b/src/calibre/ebooks/oeb/polish/download.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import cgi
 import mimetypes
diff --git a/src/calibre/ebooks/oeb/polish/embed.py b/src/calibre/ebooks/oeb/polish/embed.py
index f24c89155e..7937ce7f89 100644
--- a/src/calibre/ebooks/oeb/polish/embed.py
+++ b/src/calibre/ebooks/oeb/polish/embed.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/errors.py b/src/calibre/ebooks/oeb/polish/errors.py
index 52eb164de0..c2c27747e9 100644
--- a/src/calibre/ebooks/oeb/polish/errors.py
+++ b/src/calibre/ebooks/oeb/polish/errors.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/fonts.py b/src/calibre/ebooks/oeb/polish/fonts.py
index be381be9fd..6af8921457 100644
--- a/src/calibre/ebooks/oeb/polish/fonts.py
+++ b/src/calibre/ebooks/oeb/polish/fonts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/images.py b/src/calibre/ebooks/oeb/polish/images.py
index 958c9c4976..1b62a5ff83 100644
--- a/src/calibre/ebooks/oeb/polish/images.py
+++ b/src/calibre/ebooks/oeb/polish/images.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import os
 from functools import partial
 from threading import Thread, Event
diff --git a/src/calibre/ebooks/oeb/polish/import_book.py b/src/calibre/ebooks/oeb/polish/import_book.py
index 6699a91650..b65c612b3c 100644
--- a/src/calibre/ebooks/oeb/polish/import_book.py
+++ b/src/calibre/ebooks/oeb/polish/import_book.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/jacket.py b/src/calibre/ebooks/oeb/polish/jacket.py
index a43f5dc82c..348a9eda8d 100644
--- a/src/calibre/ebooks/oeb/polish/jacket.py
+++ b/src/calibre/ebooks/oeb/polish/jacket.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/main.py b/src/calibre/ebooks/oeb/polish/main.py
index 452244404d..049b73a857 100644
--- a/src/calibre/ebooks/oeb/polish/main.py
+++ b/src/calibre/ebooks/oeb/polish/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/opf.py b/src/calibre/ebooks/oeb/polish/opf.py
index 12eba587fc..95e5a76cf4 100644
--- a/src/calibre/ebooks/oeb/polish/opf.py
+++ b/src/calibre/ebooks/oeb/polish/opf.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/parsing.py b/src/calibre/ebooks/oeb/polish/parsing.py
index 66500357c0..097b7a53bd 100644
--- a/src/calibre/ebooks/oeb/polish/parsing.py
+++ b/src/calibre/ebooks/oeb/polish/parsing.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/pretty.py b/src/calibre/ebooks/oeb/polish/pretty.py
index b6a195924a..a5dcb13a0c 100644
--- a/src/calibre/ebooks/oeb/polish/pretty.py
+++ b/src/calibre/ebooks/oeb/polish/pretty.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/replace.py b/src/calibre/ebooks/oeb/polish/replace.py
index 86ab5ae2be..18c90f29e8 100644
--- a/src/calibre/ebooks/oeb/polish/replace.py
+++ b/src/calibre/ebooks/oeb/polish/replace.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/report.py b/src/calibre/ebooks/oeb/polish/report.py
index cec2ffb217..0c65c98acb 100644
--- a/src/calibre/ebooks/oeb/polish/report.py
+++ b/src/calibre/ebooks/oeb/polish/report.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/spell.py b/src/calibre/ebooks/oeb/polish/spell.py
index ad97ccc7c5..bcea3d6e41 100644
--- a/src/calibre/ebooks/oeb/polish/spell.py
+++ b/src/calibre/ebooks/oeb/polish/spell.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/split.py b/src/calibre/ebooks/oeb/polish/split.py
index 4e3cfd8a0c..55db21389d 100644
--- a/src/calibre/ebooks/oeb/polish/split.py
+++ b/src/calibre/ebooks/oeb/polish/split.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/stats.py b/src/calibre/ebooks/oeb/polish/stats.py
index 5a0aa55f8d..65c220e630 100644
--- a/src/calibre/ebooks/oeb/polish/stats.py
+++ b/src/calibre/ebooks/oeb/polish/stats.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/subset.py b/src/calibre/ebooks/oeb/polish/subset.py
index 18cbefc8c5..ffbbf7da27 100644
--- a/src/calibre/ebooks/oeb/polish/subset.py
+++ b/src/calibre/ebooks/oeb/polish/subset.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/tests/__init__.py b/src/calibre/ebooks/oeb/polish/tests/__init__.py
index 69376f9ebd..e4102b4b10 100644
--- a/src/calibre/ebooks/oeb/polish/tests/__init__.py
+++ b/src/calibre/ebooks/oeb/polish/tests/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/tests/base.py b/src/calibre/ebooks/oeb/polish/tests/base.py
index 7801600698..806ab9ae5c 100644
--- a/src/calibre/ebooks/oeb/polish/tests/base.py
+++ b/src/calibre/ebooks/oeb/polish/tests/base.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/tests/cascade.py b/src/calibre/ebooks/oeb/polish/tests/cascade.py
index f1368bbbc5..3b60a8bfb8 100644
--- a/src/calibre/ebooks/oeb/polish/tests/cascade.py
+++ b/src/calibre/ebooks/oeb/polish/tests/cascade.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2016, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/tests/container.py b/src/calibre/ebooks/oeb/polish/tests/container.py
index 5335711ce3..5f54f94059 100644
--- a/src/calibre/ebooks/oeb/polish/tests/container.py
+++ b/src/calibre/ebooks/oeb/polish/tests/container.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/tests/main.py b/src/calibre/ebooks/oeb/polish/tests/main.py
index 81b084b6c1..33aa02bc8d 100644
--- a/src/calibre/ebooks/oeb/polish/tests/main.py
+++ b/src/calibre/ebooks/oeb/polish/tests/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/tests/parsing.py b/src/calibre/ebooks/oeb/polish/tests/parsing.py
index 73eca065ab..383057465a 100644
--- a/src/calibre/ebooks/oeb/polish/tests/parsing.py
+++ b/src/calibre/ebooks/oeb/polish/tests/parsing.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/tests/structure.py b/src/calibre/ebooks/oeb/polish/tests/structure.py
index 94e34b1638..aaf24fe470 100644
--- a/src/calibre/ebooks/oeb/polish/tests/structure.py
+++ b/src/calibre/ebooks/oeb/polish/tests/structure.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from io import BytesIO
 from itertools import count
 from functools import partial
diff --git a/src/calibre/ebooks/oeb/polish/toc.py b/src/calibre/ebooks/oeb/polish/toc.py
index cd314db547..55a244f18f 100644
--- a/src/calibre/ebooks/oeb/polish/toc.py
+++ b/src/calibre/ebooks/oeb/polish/toc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/polish/upgrade.py b/src/calibre/ebooks/oeb/polish/upgrade.py
index 602be884e4..0385bed485 100644
--- a/src/calibre/ebooks/oeb/polish/upgrade.py
+++ b/src/calibre/ebooks/oeb/polish/upgrade.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys
 
diff --git a/src/calibre/ebooks/oeb/polish/utils.py b/src/calibre/ebooks/oeb/polish/utils.py
index a1cdfa35ed..5787a6dc4c 100644
--- a/src/calibre/ebooks/oeb/polish/utils.py
+++ b/src/calibre/ebooks/oeb/polish/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/reader.py b/src/calibre/ebooks/oeb/reader.py
index 2c248a8c1c..48d9dadd1b 100644
--- a/src/calibre/ebooks/oeb/reader.py
+++ b/src/calibre/ebooks/oeb/reader.py
@@ -1,7 +1,7 @@
 """
 Container-/OPF-based input OEBBook reader.
 """
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/oeb/stylizer.py b/src/calibre/ebooks/oeb/stylizer.py
index 109cccd06f..3019ae2d3e 100644
--- a/src/calibre/ebooks/oeb/stylizer.py
+++ b/src/calibre/ebooks/oeb/stylizer.py
@@ -1,5 +1,5 @@
 # -*- encoding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 CSS property propagation class.
diff --git a/src/calibre/ebooks/oeb/transforms/__init__.py b/src/calibre/ebooks/oeb/transforms/__init__.py
index a9b056d940..d8edc6064a 100644
--- a/src/calibre/ebooks/oeb/transforms/__init__.py
+++ b/src/calibre/ebooks/oeb/transforms/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/cover.py b/src/calibre/ebooks/oeb/transforms/cover.py
index 3f948195a1..b36c4c6362 100644
--- a/src/calibre/ebooks/oeb/transforms/cover.py
+++ b/src/calibre/ebooks/oeb/transforms/cover.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/data_url.py b/src/calibre/ebooks/oeb/transforms/data_url.py
index 0ff3de7727..7d56ba75e4 100644
--- a/src/calibre/ebooks/oeb/transforms/data_url.py
+++ b/src/calibre/ebooks/oeb/transforms/data_url.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/embed_fonts.py b/src/calibre/ebooks/oeb/transforms/embed_fonts.py
index 14c94d807e..34d8ca4fac 100644
--- a/src/calibre/ebooks/oeb/transforms/embed_fonts.py
+++ b/src/calibre/ebooks/oeb/transforms/embed_fonts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/filenames.py b/src/calibre/ebooks/oeb/transforms/filenames.py
index 69c3ae59cf..7cb6550370 100644
--- a/src/calibre/ebooks/oeb/transforms/filenames.py
+++ b/src/calibre/ebooks/oeb/transforms/filenames.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/flatcss.py b/src/calibre/ebooks/oeb/transforms/flatcss.py
index 43c2b191ca..b9b90cbd02 100644
--- a/src/calibre/ebooks/oeb/transforms/flatcss.py
+++ b/src/calibre/ebooks/oeb/transforms/flatcss.py
@@ -1,7 +1,7 @@
 '''
 CSS flattening transform.
 '''
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/oeb/transforms/guide.py b/src/calibre/ebooks/oeb/transforms/guide.py
index dbd1a9c595..8a1dfca3c2 100644
--- a/src/calibre/ebooks/oeb/transforms/guide.py
+++ b/src/calibre/ebooks/oeb/transforms/guide.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/htmltoc.py b/src/calibre/ebooks/oeb/transforms/htmltoc.py
index df6f69925e..566cc01c69 100644
--- a/src/calibre/ebooks/oeb/transforms/htmltoc.py
+++ b/src/calibre/ebooks/oeb/transforms/htmltoc.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 HTML-TOC-adding transform.
 '''
diff --git a/src/calibre/ebooks/oeb/transforms/jacket.py b/src/calibre/ebooks/oeb/transforms/jacket.py
index 4d687e369c..145ecf366f 100644
--- a/src/calibre/ebooks/oeb/transforms/jacket.py
+++ b/src/calibre/ebooks/oeb/transforms/jacket.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/linearize_tables.py b/src/calibre/ebooks/oeb/transforms/linearize_tables.py
index 8dc70d3040..24a843fe8d 100644
--- a/src/calibre/ebooks/oeb/transforms/linearize_tables.py
+++ b/src/calibre/ebooks/oeb/transforms/linearize_tables.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/manglecase.py b/src/calibre/ebooks/oeb/transforms/manglecase.py
index 24c1a9aaca..5e86d8d3bf 100644
--- a/src/calibre/ebooks/oeb/transforms/manglecase.py
+++ b/src/calibre/ebooks/oeb/transforms/manglecase.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 CSS case-mangling transform.
 '''
diff --git a/src/calibre/ebooks/oeb/transforms/metadata.py b/src/calibre/ebooks/oeb/transforms/metadata.py
index a7de238371..bd8ba8d3a6 100644
--- a/src/calibre/ebooks/oeb/transforms/metadata.py
+++ b/src/calibre/ebooks/oeb/transforms/metadata.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/page_margin.py b/src/calibre/ebooks/oeb/transforms/page_margin.py
index e2992a95af..39c99090bc 100644
--- a/src/calibre/ebooks/oeb/transforms/page_margin.py
+++ b/src/calibre/ebooks/oeb/transforms/page_margin.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/rasterize.py b/src/calibre/ebooks/oeb/transforms/rasterize.py
index 0a58dc6695..c500e7276e 100644
--- a/src/calibre/ebooks/oeb/transforms/rasterize.py
+++ b/src/calibre/ebooks/oeb/transforms/rasterize.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 SVG rasterization transform.
 '''
diff --git a/src/calibre/ebooks/oeb/transforms/rescale.py b/src/calibre/ebooks/oeb/transforms/rescale.py
index df9172da3d..382f647ab3 100644
--- a/src/calibre/ebooks/oeb/transforms/rescale.py
+++ b/src/calibre/ebooks/oeb/transforms/rescale.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/split.py b/src/calibre/ebooks/oeb/transforms/split.py
index 16858cef6c..6b88822744 100644
--- a/src/calibre/ebooks/oeb/transforms/split.py
+++ b/src/calibre/ebooks/oeb/transforms/split.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/oeb/transforms/structure.py b/src/calibre/ebooks/oeb/transforms/structure.py
index 0de0994728..24df662695 100644
--- a/src/calibre/ebooks/oeb/transforms/structure.py
+++ b/src/calibre/ebooks/oeb/transforms/structure.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/subset.py b/src/calibre/ebooks/oeb/transforms/subset.py
index 47c43c8e08..6c3772cd15 100644
--- a/src/calibre/ebooks/oeb/transforms/subset.py
+++ b/src/calibre/ebooks/oeb/transforms/subset.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/oeb/transforms/trimmanifest.py b/src/calibre/ebooks/oeb/transforms/trimmanifest.py
index d67f0e471c..d93f6dbc54 100644
--- a/src/calibre/ebooks/oeb/transforms/trimmanifest.py
+++ b/src/calibre/ebooks/oeb/transforms/trimmanifest.py
@@ -1,7 +1,7 @@
 '''
 OPF manifest trimming transform.
 '''
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/oeb/transforms/unsmarten.py b/src/calibre/ebooks/oeb/transforms/unsmarten.py
index e10c9d4141..e247309df2 100644
--- a/src/calibre/ebooks/oeb/transforms/unsmarten.py
+++ b/src/calibre/ebooks/oeb/transforms/unsmarten.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/ebooks/oeb/writer.py b/src/calibre/ebooks/oeb/writer.py
index 953c4924da..258f04d62b 100644
--- a/src/calibre/ebooks/oeb/writer.py
+++ b/src/calibre/ebooks/oeb/writer.py
@@ -1,7 +1,7 @@
 '''
 Directory output OEBBook writer.
 '''
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
diff --git a/src/calibre/ebooks/pdb/__init__.py b/src/calibre/ebooks/pdb/__init__.py
index 599744fe06..059cebda30 100644
--- a/src/calibre/ebooks/pdb/__init__.py
+++ b/src/calibre/ebooks/pdb/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/pdb/ereader/__init__.py b/src/calibre/ebooks/pdb/ereader/__init__.py
index 84661e862e..4d8c509cec 100644
--- a/src/calibre/ebooks/pdb/ereader/__init__.py
+++ b/src/calibre/ebooks/pdb/ereader/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/pdb/ereader/inspector.py b/src/calibre/ebooks/pdb/ereader/inspector.py
index ab816c6cc5..85a0d1cad3 100644
--- a/src/calibre/ebooks/pdb/ereader/inspector.py
+++ b/src/calibre/ebooks/pdb/ereader/inspector.py
@@ -2,7 +2,7 @@
 '''
 Inspect the header of ereader files. This is primarily used for debugging.
 '''
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/pdb/ereader/reader.py b/src/calibre/ebooks/pdb/ereader/reader.py
index bd2bb976f5..15a39070e2 100644
--- a/src/calibre/ebooks/pdb/ereader/reader.py
+++ b/src/calibre/ebooks/pdb/ereader/reader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read content from ereader pdb file.
diff --git a/src/calibre/ebooks/pdb/ereader/reader132.py b/src/calibre/ebooks/pdb/ereader/reader132.py
index b98c5e8356..152cb6b89d 100644
--- a/src/calibre/ebooks/pdb/ereader/reader132.py
+++ b/src/calibre/ebooks/pdb/ereader/reader132.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read content from ereader pdb file with a 132 byte header created by Dropbook.
diff --git a/src/calibre/ebooks/pdb/ereader/reader202.py b/src/calibre/ebooks/pdb/ereader/reader202.py
index fd69b19eed..a970d15c8a 100644
--- a/src/calibre/ebooks/pdb/ereader/reader202.py
+++ b/src/calibre/ebooks/pdb/ereader/reader202.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read content from ereader pdb file with a 116 and 202 byte header created by Makebook.
diff --git a/src/calibre/ebooks/pdb/ereader/writer.py b/src/calibre/ebooks/pdb/ereader/writer.py
index e31af7af6b..4239d448c7 100644
--- a/src/calibre/ebooks/pdb/ereader/writer.py
+++ b/src/calibre/ebooks/pdb/ereader/writer.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Write content to ereader pdb file.
diff --git a/src/calibre/ebooks/pdb/formatreader.py b/src/calibre/ebooks/pdb/formatreader.py
index 1d14c630de..d67c12adfa 100644
--- a/src/calibre/ebooks/pdb/formatreader.py
+++ b/src/calibre/ebooks/pdb/formatreader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Interface defining the necessary public functions for a pdb format reader.
diff --git a/src/calibre/ebooks/pdb/formatwriter.py b/src/calibre/ebooks/pdb/formatwriter.py
index 11e80c8757..7e9aeeec76 100644
--- a/src/calibre/ebooks/pdb/formatwriter.py
+++ b/src/calibre/ebooks/pdb/formatwriter.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Interface defining the necessary public functions for a pdb format writer.
diff --git a/src/calibre/ebooks/pdb/haodoo/__init__.py b/src/calibre/ebooks/pdb/haodoo/__init__.py
index 5f6c324bfc..6b2910c3df 100644
--- a/src/calibre/ebooks/pdb/haodoo/__init__.py
+++ b/src/calibre/ebooks/pdb/haodoo/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdb/haodoo/reader.py b/src/calibre/ebooks/pdb/haodoo/reader.py
index dc4497fa13..a27d0cba0d 100644
--- a/src/calibre/ebooks/pdb/haodoo/reader.py
+++ b/src/calibre/ebooks/pdb/haodoo/reader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read content from Haodoo.net pdb file.
diff --git a/src/calibre/ebooks/pdb/header.py b/src/calibre/ebooks/pdb/header.py
index afe7fda08a..8194175f95 100644
--- a/src/calibre/ebooks/pdb/header.py
+++ b/src/calibre/ebooks/pdb/header.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read the header data from a pdb file.
diff --git a/src/calibre/ebooks/pdb/palmdoc/reader.py b/src/calibre/ebooks/pdb/palmdoc/reader.py
index 8f84dc7782..16dd80d90b 100644
--- a/src/calibre/ebooks/pdb/palmdoc/reader.py
+++ b/src/calibre/ebooks/pdb/palmdoc/reader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read content from palmdoc pdb file.
diff --git a/src/calibre/ebooks/pdb/palmdoc/writer.py b/src/calibre/ebooks/pdb/palmdoc/writer.py
index 272e991b41..90d57313df 100644
--- a/src/calibre/ebooks/pdb/palmdoc/writer.py
+++ b/src/calibre/ebooks/pdb/palmdoc/writer.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Writer content to palmdoc pdb file.
diff --git a/src/calibre/ebooks/pdb/pdf/reader.py b/src/calibre/ebooks/pdb/pdf/reader.py
index df0af2cfbd..f683621e25 100644
--- a/src/calibre/ebooks/pdb/pdf/reader.py
+++ b/src/calibre/ebooks/pdb/pdf/reader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read content from palmdoc pdb file.
diff --git a/src/calibre/ebooks/pdb/plucker/reader.py b/src/calibre/ebooks/pdb/plucker/reader.py
index 43d8a99471..b92dd6a8e2 100644
--- a/src/calibre/ebooks/pdb/plucker/reader.py
+++ b/src/calibre/ebooks/pdb/plucker/reader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__   = 'GPL v3'
diff --git a/src/calibre/ebooks/pdb/ztxt/__init__.py b/src/calibre/ebooks/pdb/ztxt/__init__.py
index 18d4da97be..9c80210a38 100644
--- a/src/calibre/ebooks/pdb/ztxt/__init__.py
+++ b/src/calibre/ebooks/pdb/ztxt/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/pdb/ztxt/reader.py b/src/calibre/ebooks/pdb/ztxt/reader.py
index a1c36cf808..547ba23dab 100644
--- a/src/calibre/ebooks/pdb/ztxt/reader.py
+++ b/src/calibre/ebooks/pdb/ztxt/reader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Read content from ztxt pdb file.
diff --git a/src/calibre/ebooks/pdb/ztxt/writer.py b/src/calibre/ebooks/pdb/ztxt/writer.py
index 05805c4253..0f18ab8b77 100644
--- a/src/calibre/ebooks/pdb/ztxt/writer.py
+++ b/src/calibre/ebooks/pdb/ztxt/writer.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Writer content to ztxt pdb file.
diff --git a/src/calibre/ebooks/pdf/__init__.py b/src/calibre/ebooks/pdf/__init__.py
index 7719a77e95..1abd04f443 100644
--- a/src/calibre/ebooks/pdf/__init__.py
+++ b/src/calibre/ebooks/pdf/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/ebooks/pdf/develop.py b/src/calibre/ebooks/pdf/develop.py
index 928184f194..67ad81f2c9 100644
--- a/src/calibre/ebooks/pdf/develop.py
+++ b/src/calibre/ebooks/pdf/develop.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys
 
diff --git a/src/calibre/ebooks/pdf/html_writer.py b/src/calibre/ebooks/pdf/html_writer.py
index 8eca73ee37..be00d1bb3c 100644
--- a/src/calibre/ebooks/pdf/html_writer.py
+++ b/src/calibre/ebooks/pdf/html_writer.py
@@ -3,7 +3,7 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 # Imports {{{
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import copy
 import json
diff --git a/src/calibre/ebooks/pdf/image_writer.py b/src/calibre/ebooks/pdf/image_writer.py
index d76ccb533c..51bb7439c1 100644
--- a/src/calibre/ebooks/pdf/image_writer.py
+++ b/src/calibre/ebooks/pdf/image_writer.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import QMarginsF, QPageLayout, QPageSize, QSize
 
diff --git a/src/calibre/ebooks/pdf/pageoptions.py b/src/calibre/ebooks/pdf/pageoptions.py
index fd63da24f7..6dccf2f14f 100644
--- a/src/calibre/ebooks/pdf/pageoptions.py
+++ b/src/calibre/ebooks/pdf/pageoptions.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/pdf/pdftohtml.py b/src/calibre/ebooks/pdf/pdftohtml.py
index bee3ba4599..9eedf39a9c 100644
--- a/src/calibre/ebooks/pdf/pdftohtml.py
+++ b/src/calibre/ebooks/pdf/pdftohtml.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import print_function, unicode_literals
+
 
 import errno
 import os
diff --git a/src/calibre/ebooks/pdf/reflow.py b/src/calibre/ebooks/pdf/reflow.py
index 842a09cd69..60486a2618 100644
--- a/src/calibre/ebooks/pdf/reflow.py
+++ b/src/calibre/ebooks/pdf/reflow.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdf/render/__init__.py b/src/calibre/ebooks/pdf/render/__init__.py
index 2b86b54dc3..3610d3374c 100644
--- a/src/calibre/ebooks/pdf/render/__init__.py
+++ b/src/calibre/ebooks/pdf/render/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdf/render/common.py b/src/calibre/ebooks/pdf/render/common.py
index f4496af042..0c607fd947 100644
--- a/src/calibre/ebooks/pdf/render/common.py
+++ b/src/calibre/ebooks/pdf/render/common.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdf/render/fonts.py b/src/calibre/ebooks/pdf/render/fonts.py
index 9319597c88..7d0dd05e10 100644
--- a/src/calibre/ebooks/pdf/render/fonts.py
+++ b/src/calibre/ebooks/pdf/render/fonts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdf/render/gradients.py b/src/calibre/ebooks/pdf/render/gradients.py
index c23eac0f0c..5cdac4e624 100644
--- a/src/calibre/ebooks/pdf/render/gradients.py
+++ b/src/calibre/ebooks/pdf/render/gradients.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdf/render/graphics.py b/src/calibre/ebooks/pdf/render/graphics.py
index f1c788ffb2..0f641ceba5 100644
--- a/src/calibre/ebooks/pdf/render/graphics.py
+++ b/src/calibre/ebooks/pdf/render/graphics.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdf/render/links.py b/src/calibre/ebooks/pdf/render/links.py
index 51457d5483..6f090785a8 100644
--- a/src/calibre/ebooks/pdf/render/links.py
+++ b/src/calibre/ebooks/pdf/render/links.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdf/render/serialize.py b/src/calibre/ebooks/pdf/render/serialize.py
index 4d3e22628c..8d6a5cb9c1 100644
--- a/src/calibre/ebooks/pdf/render/serialize.py
+++ b/src/calibre/ebooks/pdf/render/serialize.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/pdf/test_html_writer.py b/src/calibre/ebooks/pdf/test_html_writer.py
index a8c1937b32..4527f0295d 100644
--- a/src/calibre/ebooks/pdf/test_html_writer.py
+++ b/src/calibre/ebooks/pdf/test_html_writer.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import unittest
 from .html_writer import merge_w_arrays, merge_cmaps
diff --git a/src/calibre/ebooks/pml/__init__.py b/src/calibre/ebooks/pml/__init__.py
index d3d90c74e4..e4091d8e48 100644
--- a/src/calibre/ebooks/pml/__init__.py
+++ b/src/calibre/ebooks/pml/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/pml/pmlconverter.py b/src/calibre/ebooks/pml/pmlconverter.py
index 23ee41ba07..ecc6473e14 100644
--- a/src/calibre/ebooks/pml/pmlconverter.py
+++ b/src/calibre/ebooks/pml/pmlconverter.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Convert pml markup to and from html
diff --git a/src/calibre/ebooks/pml/pmlml.py b/src/calibre/ebooks/pml/pmlml.py
index 6474656b94..13ae4af57c 100644
--- a/src/calibre/ebooks/pml/pmlml.py
+++ b/src/calibre/ebooks/pml/pmlml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/rb/__init__.py b/src/calibre/ebooks/rb/__init__.py
index f942dc3eb2..4a44bf10e3 100644
--- a/src/calibre/ebooks/rb/__init__.py
+++ b/src/calibre/ebooks/rb/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/rb/rbml.py b/src/calibre/ebooks/rb/rbml.py
index 54d631f546..e8bba03127 100644
--- a/src/calibre/ebooks/rb/rbml.py
+++ b/src/calibre/ebooks/rb/rbml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/rb/reader.py b/src/calibre/ebooks/rb/reader.py
index bbbc647871..88672ad819 100644
--- a/src/calibre/ebooks/rb/reader.py
+++ b/src/calibre/ebooks/rb/reader.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/rb/writer.py b/src/calibre/ebooks/rb/writer.py
index 294bd19b6e..42a004101c 100644
--- a/src/calibre/ebooks/rb/writer.py
+++ b/src/calibre/ebooks/rb/writer.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/readability/cleaners.py b/src/calibre/ebooks/readability/cleaners.py
index ee160f594b..aa6a25a5b0 100644
--- a/src/calibre/ebooks/readability/cleaners.py
+++ b/src/calibre/ebooks/readability/cleaners.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 # strip out a set of nuisance html attributes that can mess up rendering in RSS feeds
 import re
diff --git a/src/calibre/ebooks/readability/debug.py b/src/calibre/ebooks/readability/debug.py
index d8557b606e..1a74948ba5 100644
--- a/src/calibre/ebooks/readability/debug.py
+++ b/src/calibre/ebooks/readability/debug.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 def save_to_file(text, filename):
diff --git a/src/calibre/ebooks/readability/htmls.py b/src/calibre/ebooks/readability/htmls.py
index 56aa159508..4a72f053f7 100644
--- a/src/calibre/ebooks/readability/htmls.py
+++ b/src/calibre/ebooks/readability/htmls.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re
 
diff --git a/src/calibre/ebooks/readability/readability.py b/src/calibre/ebooks/readability/readability.py
index 9ffd484e10..96aa347899 100644
--- a/src/calibre/ebooks/readability/readability.py
+++ b/src/calibre/ebooks/readability/readability.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re, sys
 from collections import defaultdict
diff --git a/src/calibre/ebooks/render_html.py b/src/calibre/ebooks/render_html.py
index 158b5891eb..4b6858d950 100644
--- a/src/calibre/ebooks/render_html.py
+++ b/src/calibre/ebooks/render_html.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import sys
diff --git a/src/calibre/ebooks/rtf/input.py b/src/calibre/ebooks/rtf/input.py
index 075eaaa36b..fd0fcad91e 100644
--- a/src/calibre/ebooks/rtf/input.py
+++ b/src/calibre/ebooks/rtf/input.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/ebooks/rtf/preprocess.py b/src/calibre/ebooks/rtf/preprocess.py
index f78089c4ba..d827889cd7 100644
--- a/src/calibre/ebooks/rtf/preprocess.py
+++ b/src/calibre/ebooks/rtf/preprocess.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Gerendi Sandor Attila'
diff --git a/src/calibre/ebooks/rtf/rtfml.py b/src/calibre/ebooks/rtf/rtfml.py
index 9098038f32..93c56c4e6a 100644
--- a/src/calibre/ebooks/rtf/rtfml.py
+++ b/src/calibre/ebooks/rtf/rtfml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/rtf2xml/ParseRtf.py b/src/calibre/ebooks/rtf2xml/ParseRtf.py
index 91737da2a3..c7bc4fa0f6 100644
--- a/src/calibre/ebooks/rtf2xml/ParseRtf.py
+++ b/src/calibre/ebooks/rtf2xml/ParseRtf.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/__init__.py b/src/calibre/ebooks/rtf2xml/__init__.py
index a106fe9eca..c02bcf8676 100644
--- a/src/calibre/ebooks/rtf2xml/__init__.py
+++ b/src/calibre/ebooks/rtf2xml/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 
 import io
 
diff --git a/src/calibre/ebooks/rtf2xml/add_brackets.py b/src/calibre/ebooks/rtf2xml/add_brackets.py
index 3f991d5e34..88db2c0064 100644
--- a/src/calibre/ebooks/rtf2xml/add_brackets.py
+++ b/src/calibre/ebooks/rtf2xml/add_brackets.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/body_styles.py b/src/calibre/ebooks/rtf2xml/body_styles.py
index ec78443a75..27ace8fd58 100644
--- a/src/calibre/ebooks/rtf2xml/body_styles.py
+++ b/src/calibre/ebooks/rtf2xml/body_styles.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/border_parse.py b/src/calibre/ebooks/rtf2xml/border_parse.py
index 782b0b8cbb..8c0e9beb36 100644
--- a/src/calibre/ebooks/rtf2xml/border_parse.py
+++ b/src/calibre/ebooks/rtf2xml/border_parse.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/char_set.py b/src/calibre/ebooks/rtf2xml/char_set.py
index 5ad6950856..a680ba365a 100644
--- a/src/calibre/ebooks/rtf2xml/char_set.py
+++ b/src/calibre/ebooks/rtf2xml/char_set.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 char_set = """
 <ms_standard>
 NON-BREAKING HYPEHN:_:8290:&#x2011;
diff --git a/src/calibre/ebooks/rtf2xml/check_brackets.py b/src/calibre/ebooks/rtf2xml/check_brackets.py
index c3ebfcde32..e82ca1c471 100644
--- a/src/calibre/ebooks/rtf2xml/check_brackets.py
+++ b/src/calibre/ebooks/rtf2xml/check_brackets.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/check_encoding.py b/src/calibre/ebooks/rtf2xml/check_encoding.py
index 4b37d7a987..1c14d66c3f 100644
--- a/src/calibre/ebooks/rtf2xml/check_encoding.py
+++ b/src/calibre/ebooks/rtf2xml/check_encoding.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys
 
diff --git a/src/calibre/ebooks/rtf2xml/colors.py b/src/calibre/ebooks/rtf2xml/colors.py
index 7530e7bd0c..06374e152a 100644
--- a/src/calibre/ebooks/rtf2xml/colors.py
+++ b/src/calibre/ebooks/rtf2xml/colors.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/combine_borders.py b/src/calibre/ebooks/rtf2xml/combine_borders.py
index 547f7d709f..81576c07d7 100644
--- a/src/calibre/ebooks/rtf2xml/combine_borders.py
+++ b/src/calibre/ebooks/rtf2xml/combine_borders.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/configure_txt.py b/src/calibre/ebooks/rtf2xml/configure_txt.py
index 2ce8f94a77..7c0c1c78b3 100644
--- a/src/calibre/ebooks/rtf2xml/configure_txt.py
+++ b/src/calibre/ebooks/rtf2xml/configure_txt.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 import os, sys
 from . import open_for_read
 
diff --git a/src/calibre/ebooks/rtf2xml/convert_to_tags.py b/src/calibre/ebooks/rtf2xml/convert_to_tags.py
index b9c11754da..b2885feb45 100644
--- a/src/calibre/ebooks/rtf2xml/convert_to_tags.py
+++ b/src/calibre/ebooks/rtf2xml/convert_to_tags.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 import os, sys
 
 from calibre.ebooks.rtf2xml import copy, check_encoding
diff --git a/src/calibre/ebooks/rtf2xml/copy.py b/src/calibre/ebooks/rtf2xml/copy.py
index f81cc505b3..5f378367c6 100644
--- a/src/calibre/ebooks/rtf2xml/copy.py
+++ b/src/calibre/ebooks/rtf2xml/copy.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/default_encoding.py b/src/calibre/ebooks/rtf2xml/default_encoding.py
index a1b701953c..c3745dc822 100644
--- a/src/calibre/ebooks/rtf2xml/default_encoding.py
+++ b/src/calibre/ebooks/rtf2xml/default_encoding.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #   copyright 2002 Paul Henry Tremblay                                  #
diff --git a/src/calibre/ebooks/rtf2xml/delete_info.py b/src/calibre/ebooks/rtf2xml/delete_info.py
index fe92139156..fdcf0fccfe 100644
--- a/src/calibre/ebooks/rtf2xml/delete_info.py
+++ b/src/calibre/ebooks/rtf2xml/delete_info.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/field_strings.py b/src/calibre/ebooks/rtf2xml/field_strings.py
index a43f4a6992..4bdd9ad1ce 100644
--- a/src/calibre/ebooks/rtf2xml/field_strings.py
+++ b/src/calibre/ebooks/rtf2xml/field_strings.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/fields_large.py b/src/calibre/ebooks/rtf2xml/fields_large.py
index 6216217a15..78df869ddd 100644
--- a/src/calibre/ebooks/rtf2xml/fields_large.py
+++ b/src/calibre/ebooks/rtf2xml/fields_large.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/fields_small.py b/src/calibre/ebooks/rtf2xml/fields_small.py
index d9ac4b78cb..53235aca74 100644
--- a/src/calibre/ebooks/rtf2xml/fields_small.py
+++ b/src/calibre/ebooks/rtf2xml/fields_small.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/fonts.py b/src/calibre/ebooks/rtf2xml/fonts.py
index 20c6151d2c..6312bd3442 100644
--- a/src/calibre/ebooks/rtf2xml/fonts.py
+++ b/src/calibre/ebooks/rtf2xml/fonts.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/footnote.py b/src/calibre/ebooks/rtf2xml/footnote.py
index 36e7624134..c6b7c8fdb2 100644
--- a/src/calibre/ebooks/rtf2xml/footnote.py
+++ b/src/calibre/ebooks/rtf2xml/footnote.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/get_char_map.py b/src/calibre/ebooks/rtf2xml/get_char_map.py
index 9b6734761c..7fe1384580 100644
--- a/src/calibre/ebooks/rtf2xml/get_char_map.py
+++ b/src/calibre/ebooks/rtf2xml/get_char_map.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/get_options.py b/src/calibre/ebooks/rtf2xml/get_options.py
index c99a0d86ed..1ffc61b8d7 100644
--- a/src/calibre/ebooks/rtf2xml/get_options.py
+++ b/src/calibre/ebooks/rtf2xml/get_options.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/group_borders.py b/src/calibre/ebooks/rtf2xml/group_borders.py
index bc34c99a32..f666d10f20 100644
--- a/src/calibre/ebooks/rtf2xml/group_borders.py
+++ b/src/calibre/ebooks/rtf2xml/group_borders.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/group_styles.py b/src/calibre/ebooks/rtf2xml/group_styles.py
index e0c0b4444f..dc71615c38 100644
--- a/src/calibre/ebooks/rtf2xml/group_styles.py
+++ b/src/calibre/ebooks/rtf2xml/group_styles.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/header.py b/src/calibre/ebooks/rtf2xml/header.py
index 05a4783172..c88bb7b597 100644
--- a/src/calibre/ebooks/rtf2xml/header.py
+++ b/src/calibre/ebooks/rtf2xml/header.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/headings_to_sections.py b/src/calibre/ebooks/rtf2xml/headings_to_sections.py
index f9bc59ba3c..c012479b88 100644
--- a/src/calibre/ebooks/rtf2xml/headings_to_sections.py
+++ b/src/calibre/ebooks/rtf2xml/headings_to_sections.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/hex_2_utf8.py b/src/calibre/ebooks/rtf2xml/hex_2_utf8.py
index 71d0f25496..38b0dfee42 100644
--- a/src/calibre/ebooks/rtf2xml/hex_2_utf8.py
+++ b/src/calibre/ebooks/rtf2xml/hex_2_utf8.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/info.py b/src/calibre/ebooks/rtf2xml/info.py
index 37a1bf7c65..03ca7b8aaa 100644
--- a/src/calibre/ebooks/rtf2xml/info.py
+++ b/src/calibre/ebooks/rtf2xml/info.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/inline.py b/src/calibre/ebooks/rtf2xml/inline.py
index 301c7eae4d..58f96c84da 100644
--- a/src/calibre/ebooks/rtf2xml/inline.py
+++ b/src/calibre/ebooks/rtf2xml/inline.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 import sys, os
 
 from calibre.ebooks.rtf2xml import copy
diff --git a/src/calibre/ebooks/rtf2xml/line_endings.py b/src/calibre/ebooks/rtf2xml/line_endings.py
index 4660097c6e..11840279fd 100644
--- a/src/calibre/ebooks/rtf2xml/line_endings.py
+++ b/src/calibre/ebooks/rtf2xml/line_endings.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/list_numbers.py b/src/calibre/ebooks/rtf2xml/list_numbers.py
index 7e074f107e..2ce48babe9 100644
--- a/src/calibre/ebooks/rtf2xml/list_numbers.py
+++ b/src/calibre/ebooks/rtf2xml/list_numbers.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/list_table.py b/src/calibre/ebooks/rtf2xml/list_table.py
index 8688430cf1..47fe52e3c8 100644
--- a/src/calibre/ebooks/rtf2xml/list_table.py
+++ b/src/calibre/ebooks/rtf2xml/list_table.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/make_lists.py b/src/calibre/ebooks/rtf2xml/make_lists.py
index 7cfd07beae..c5d7657a00 100644
--- a/src/calibre/ebooks/rtf2xml/make_lists.py
+++ b/src/calibre/ebooks/rtf2xml/make_lists.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/old_rtf.py b/src/calibre/ebooks/rtf2xml/old_rtf.py
index 65137b55dc..8ed2cd6177 100644
--- a/src/calibre/ebooks/rtf2xml/old_rtf.py
+++ b/src/calibre/ebooks/rtf2xml/old_rtf.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/options_trem.py b/src/calibre/ebooks/rtf2xml/options_trem.py
index d8fdf7d3dd..d2ceb5c282 100644
--- a/src/calibre/ebooks/rtf2xml/options_trem.py
+++ b/src/calibre/ebooks/rtf2xml/options_trem.py
@@ -1,5 +1,5 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
-from __future__ import print_function
+
+
 import sys
 
 
diff --git a/src/calibre/ebooks/rtf2xml/output.py b/src/calibre/ebooks/rtf2xml/output.py
index 7e653fee1a..2af1af1506 100644
--- a/src/calibre/ebooks/rtf2xml/output.py
+++ b/src/calibre/ebooks/rtf2xml/output.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/override_table.py b/src/calibre/ebooks/rtf2xml/override_table.py
index 3ae53097c9..cb733b9a80 100644
--- a/src/calibre/ebooks/rtf2xml/override_table.py
+++ b/src/calibre/ebooks/rtf2xml/override_table.py
@@ -1,5 +1,5 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
-from __future__ import print_function
+
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/paragraph_def.py b/src/calibre/ebooks/rtf2xml/paragraph_def.py
index f5aab5df05..fe9dddc3a3 100644
--- a/src/calibre/ebooks/rtf2xml/paragraph_def.py
+++ b/src/calibre/ebooks/rtf2xml/paragraph_def.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/paragraphs.py b/src/calibre/ebooks/rtf2xml/paragraphs.py
index 5962c9298d..8c4fa6dfe9 100644
--- a/src/calibre/ebooks/rtf2xml/paragraphs.py
+++ b/src/calibre/ebooks/rtf2xml/paragraphs.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/pict.py b/src/calibre/ebooks/rtf2xml/pict.py
index f3b1f74f18..2298dc98fc 100644
--- a/src/calibre/ebooks/rtf2xml/pict.py
+++ b/src/calibre/ebooks/rtf2xml/pict.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/preamble_div.py b/src/calibre/ebooks/rtf2xml/preamble_div.py
index cd7bcbef0a..7fb2c49781 100644
--- a/src/calibre/ebooks/rtf2xml/preamble_div.py
+++ b/src/calibre/ebooks/rtf2xml/preamble_div.py
@@ -1,5 +1,5 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
-from __future__ import print_function
+
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/preamble_rest.py b/src/calibre/ebooks/rtf2xml/preamble_rest.py
index 9a828799a7..0bbf6c50b5 100644
--- a/src/calibre/ebooks/rtf2xml/preamble_rest.py
+++ b/src/calibre/ebooks/rtf2xml/preamble_rest.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/process_tokens.py b/src/calibre/ebooks/rtf2xml/process_tokens.py
index e64fba4d8c..f77316d699 100644
--- a/src/calibre/ebooks/rtf2xml/process_tokens.py
+++ b/src/calibre/ebooks/rtf2xml/process_tokens.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/replace_illegals.py b/src/calibre/ebooks/rtf2xml/replace_illegals.py
index 38616c0c8c..cb38251a5f 100644
--- a/src/calibre/ebooks/rtf2xml/replace_illegals.py
+++ b/src/calibre/ebooks/rtf2xml/replace_illegals.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/sections.py b/src/calibre/ebooks/rtf2xml/sections.py
index fdc0ed4eb6..738b79dc7a 100644
--- a/src/calibre/ebooks/rtf2xml/sections.py
+++ b/src/calibre/ebooks/rtf2xml/sections.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/styles.py b/src/calibre/ebooks/rtf2xml/styles.py
index d86e26782f..0f0d1b9a1a 100644
--- a/src/calibre/ebooks/rtf2xml/styles.py
+++ b/src/calibre/ebooks/rtf2xml/styles.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/table.py b/src/calibre/ebooks/rtf2xml/table.py
index 139dea4971..2070644daa 100644
--- a/src/calibre/ebooks/rtf2xml/table.py
+++ b/src/calibre/ebooks/rtf2xml/table.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/table_info.py b/src/calibre/ebooks/rtf2xml/table_info.py
index cb4bc5e64f..c6df02425b 100644
--- a/src/calibre/ebooks/rtf2xml/table_info.py
+++ b/src/calibre/ebooks/rtf2xml/table_info.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/rtf2xml/tokenize.py b/src/calibre/ebooks/rtf2xml/tokenize.py
index be7d6b2b00..752a3ec82d 100644
--- a/src/calibre/ebooks/rtf2xml/tokenize.py
+++ b/src/calibre/ebooks/rtf2xml/tokenize.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals, absolute_import, print_function, division
+
 #########################################################################
 #                                                                       #
 #                                                                       #
diff --git a/src/calibre/ebooks/snb/__init__.py b/src/calibre/ebooks/snb/__init__.py
index 8960b40971..2dbe0801dc 100644
--- a/src/calibre/ebooks/snb/__init__.py
+++ b/src/calibre/ebooks/snb/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Li Fanxi <lifanxi@freemindworld.com>'
diff --git a/src/calibre/ebooks/snb/snbfile.py b/src/calibre/ebooks/snb/snbfile.py
index 8cfe99b680..f905156291 100644
--- a/src/calibre/ebooks/snb/snbfile.py
+++ b/src/calibre/ebooks/snb/snbfile.py
@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2010, Li Fanxi <lifanxi@freemindworld.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/snb/snbml.py b/src/calibre/ebooks/snb/snbml.py
index 4936587ae5..f967edf9eb 100644
--- a/src/calibre/ebooks/snb/snbml.py
+++ b/src/calibre/ebooks/snb/snbml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Li Fanxi <lifanxi@freemindworld.com>'
diff --git a/src/calibre/ebooks/tcr/__init__.py b/src/calibre/ebooks/tcr/__init__.py
index c2b701674a..c8ab3b77a5 100644
--- a/src/calibre/ebooks/tcr/__init__.py
+++ b/src/calibre/ebooks/tcr/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/textile/__init__.py b/src/calibre/ebooks/textile/__init__.py
index 5a0a767bd2..b8f48e442d 100644
--- a/src/calibre/ebooks/textile/__init__.py
+++ b/src/calibre/ebooks/textile/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from .functions import textile, textile_restricted, Textile
 
 if False:
diff --git a/src/calibre/ebooks/textile/functions.py b/src/calibre/ebooks/textile/functions.py
index 46ada607d5..efb889558f 100644
--- a/src/calibre/ebooks/textile/functions.py
+++ b/src/calibre/ebooks/textile/functions.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """
 PyTextile
diff --git a/src/calibre/ebooks/textile/unsmarten.py b/src/calibre/ebooks/textile/unsmarten.py
index ff05227842..07ed152319 100644
--- a/src/calibre/ebooks/textile/unsmarten.py
+++ b/src/calibre/ebooks/textile/unsmarten.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, Leigh Parry <leighparry@blueyonder.co.uk>'
diff --git a/src/calibre/ebooks/tweak.py b/src/calibre/ebooks/tweak.py
index 6a6cd59ae5..ffac9654ac 100644
--- a/src/calibre/ebooks/tweak.py
+++ b/src/calibre/ebooks/tweak.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/ebooks/txt/__init__.py b/src/calibre/ebooks/txt/__init__.py
index 226ecb3c60..ca69497050 100644
--- a/src/calibre/ebooks/txt/__init__.py
+++ b/src/calibre/ebooks/txt/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, John Schember john@nachtimwald.com'
diff --git a/src/calibre/ebooks/txt/markdownml.py b/src/calibre/ebooks/txt/markdownml.py
index 4c25c47c1c..44d288358d 100644
--- a/src/calibre/ebooks/txt/markdownml.py
+++ b/src/calibre/ebooks/txt/markdownml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '''2011, John Schember <john@nachtimwald.com>
diff --git a/src/calibre/ebooks/txt/newlines.py b/src/calibre/ebooks/txt/newlines.py
index 56a890cadf..45e58d2bb9 100644
--- a/src/calibre/ebooks/txt/newlines.py
+++ b/src/calibre/ebooks/txt/newlines.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/txt/processor.py b/src/calibre/ebooks/txt/processor.py
index dbe6dfe9db..b2f4cc9bf0 100644
--- a/src/calibre/ebooks/txt/processor.py
+++ b/src/calibre/ebooks/txt/processor.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/txt/textileml.py b/src/calibre/ebooks/txt/textileml.py
index e9eecfcc8e..b4ed4cdbc3 100644
--- a/src/calibre/ebooks/txt/textileml.py
+++ b/src/calibre/ebooks/txt/textileml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, Leigh Parry <leighparry@blueyonder.co.uk>'
diff --git a/src/calibre/ebooks/txt/txtml.py b/src/calibre/ebooks/txt/txtml.py
index 14cc7d8c5f..a6bdd91226 100644
--- a/src/calibre/ebooks/txt/txtml.py
+++ b/src/calibre/ebooks/txt/txtml.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/unihandecode/__init__.py b/src/calibre/ebooks/unihandecode/__init__.py
index 91238eddaa..8794775562 100644
--- a/src/calibre/ebooks/unihandecode/__init__.py
+++ b/src/calibre/ebooks/unihandecode/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/ebooks/unihandecode/jacodepoints.py b/src/calibre/ebooks/unihandecode/jacodepoints.py
index 89d83d94b6..324e265343 100644
--- a/src/calibre/ebooks/unihandecode/jacodepoints.py
+++ b/src/calibre/ebooks/unihandecode/jacodepoints.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010 Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/ebooks/unihandecode/jadecoder.py b/src/calibre/ebooks/unihandecode/jadecoder.py
index d6318c270d..9f838c02a0 100644
--- a/src/calibre/ebooks/unihandecode/jadecoder.py
+++ b/src/calibre/ebooks/unihandecode/jadecoder.py
@@ -1,5 +1,5 @@
 # coding:utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/ebooks/unihandecode/krcodepoints.py b/src/calibre/ebooks/unihandecode/krcodepoints.py
index bca8e3f4b4..0940db6698 100644
--- a/src/calibre/ebooks/unihandecode/krcodepoints.py
+++ b/src/calibre/ebooks/unihandecode/krcodepoints.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010 Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/ebooks/unihandecode/krdecoder.py b/src/calibre/ebooks/unihandecode/krdecoder.py
index 914f6f41c6..ab60b7865a 100644
--- a/src/calibre/ebooks/unihandecode/krdecoder.py
+++ b/src/calibre/ebooks/unihandecode/krdecoder.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/ebooks/unihandecode/pykakasi/__init__.py b/src/calibre/ebooks/unihandecode/pykakasi/__init__.py
index 4995491752..b7fc7265e7 100644
--- a/src/calibre/ebooks/unihandecode/pykakasi/__init__.py
+++ b/src/calibre/ebooks/unihandecode/pykakasi/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.ebooks.unihandecode.pykakasi.kakasi import kakasi
 kakasi
diff --git a/src/calibre/ebooks/unihandecode/pykakasi/h2a.py b/src/calibre/ebooks/unihandecode/pykakasi/h2a.py
index ebbf06fdf3..06cb6803f6 100644
--- a/src/calibre/ebooks/unihandecode/pykakasi/h2a.py
+++ b/src/calibre/ebooks/unihandecode/pykakasi/h2a.py
@@ -20,7 +20,7 @@
 # * GNU General Public License for more details.
 # *
 # */
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import range
 
diff --git a/src/calibre/ebooks/unihandecode/pykakasi/j2h.py b/src/calibre/ebooks/unihandecode/pykakasi/j2h.py
index 3a9d836df2..f264795862 100644
--- a/src/calibre/ebooks/unihandecode/pykakasi/j2h.py
+++ b/src/calibre/ebooks/unihandecode/pykakasi/j2h.py
@@ -20,7 +20,7 @@
 # * GNU General Public License for more details.
 # *
 # */
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re
 
diff --git a/src/calibre/ebooks/unihandecode/pykakasi/jisyo.py b/src/calibre/ebooks/unihandecode/pykakasi/jisyo.py
index 2c1c95f32a..45608e9c98 100644
--- a/src/calibre/ebooks/unihandecode/pykakasi/jisyo.py
+++ b/src/calibre/ebooks/unihandecode/pykakasi/jisyo.py
@@ -2,7 +2,7 @@
 #  jisyo.py
 #
 # Copyright 2011 Hiroshi Miura <miurahr@linux.com>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from zlib import decompress
 
diff --git a/src/calibre/ebooks/unihandecode/pykakasi/k2a.py b/src/calibre/ebooks/unihandecode/pykakasi/k2a.py
index fb5b5da1ac..0e7833dbd0 100644
--- a/src/calibre/ebooks/unihandecode/pykakasi/k2a.py
+++ b/src/calibre/ebooks/unihandecode/pykakasi/k2a.py
@@ -20,7 +20,7 @@
 # * GNU General Public License for more details.
 # *
 # */
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.ebooks.unihandecode.pykakasi.jisyo import jisyo
 from polyglot.builtins import range
diff --git a/src/calibre/ebooks/unihandecode/pykakasi/kakasi.py b/src/calibre/ebooks/unihandecode/pykakasi/kakasi.py
index 47a8c026f8..8d1ee785ff 100644
--- a/src/calibre/ebooks/unihandecode/pykakasi/kakasi.py
+++ b/src/calibre/ebooks/unihandecode/pykakasi/kakasi.py
@@ -20,7 +20,7 @@
 # * GNU General Public License for more details.
 # *
 # */
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.ebooks.unihandecode.pykakasi.j2h import J2H
 from calibre.ebooks.unihandecode.pykakasi.h2a import H2a
diff --git a/src/calibre/ebooks/unihandecode/unicodepoints.py b/src/calibre/ebooks/unihandecode/unicodepoints.py
index 13eeed2e03..2586b6f313 100644
--- a/src/calibre/ebooks/unihandecode/unicodepoints.py
+++ b/src/calibre/ebooks/unihandecode/unicodepoints.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/ebooks/unihandecode/unidecoder.py b/src/calibre/ebooks/unihandecode/unidecoder.py
index e66a11da2f..e80d6b04d1 100644
--- a/src/calibre/ebooks/unihandecode/unidecoder.py
+++ b/src/calibre/ebooks/unihandecode/unidecoder.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/ebooks/unihandecode/vncodepoints.py b/src/calibre/ebooks/unihandecode/vncodepoints.py
index 2a74bb157b..831f3bf8ab 100644
--- a/src/calibre/ebooks/unihandecode/vncodepoints.py
+++ b/src/calibre/ebooks/unihandecode/vncodepoints.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010 Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/ebooks/unihandecode/vndecoder.py b/src/calibre/ebooks/unihandecode/vndecoder.py
index 60ee7fbdf9..2201e749e1 100644
--- a/src/calibre/ebooks/unihandecode/vndecoder.py
+++ b/src/calibre/ebooks/unihandecode/vndecoder.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/ebooks/unihandecode/zhcodepoints.py b/src/calibre/ebooks/unihandecode/zhcodepoints.py
index 57e4de3326..67f866bdfb 100644
--- a/src/calibre/ebooks/unihandecode/zhcodepoints.py
+++ b/src/calibre/ebooks/unihandecode/zhcodepoints.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010 Hiroshi Miura <miurahr@linux.com>'
diff --git a/src/calibre/gui2/__init__.py b/src/calibre/gui2/__init__.py
index a7806a00c8..ba8a369d1f 100644
--- a/src/calibre/gui2/__init__.py
+++ b/src/calibre/gui2/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/__init__.py b/src/calibre/gui2/actions/__init__.py
index ebfe600c7c..9f30b5f997 100644
--- a/src/calibre/gui2/actions/__init__.py
+++ b/src/calibre/gui2/actions/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/add.py b/src/calibre/gui2/actions/add.py
index 3ab0425971..a1ff257a60 100644
--- a/src/calibre/gui2/actions/add.py
+++ b/src/calibre/gui2/actions/add.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/add_to_library.py b/src/calibre/gui2/actions/add_to_library.py
index bf406a2ef4..f8e54900af 100644
--- a/src/calibre/gui2/actions/add_to_library.py
+++ b/src/calibre/gui2/actions/add_to_library.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/annotate.py b/src/calibre/gui2/actions/annotate.py
index 516c4d209c..eaa4ab9512 100644
--- a/src/calibre/gui2/actions/annotate.py
+++ b/src/calibre/gui2/actions/annotate.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/author_mapper.py b/src/calibre/gui2/actions/author_mapper.py
index 8d708a8b10..8fd4c658bf 100644
--- a/src/calibre/gui2/actions/author_mapper.py
+++ b/src/calibre/gui2/actions/author_mapper.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.gui2 import gprefs
 from calibre.gui2.actions import InterfaceAction
diff --git a/src/calibre/gui2/actions/catalog.py b/src/calibre/gui2/actions/catalog.py
index 942b27ff60..19996655f5 100644
--- a/src/calibre/gui2/actions/catalog.py
+++ b/src/calibre/gui2/actions/catalog.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/choose_library.py b/src/calibre/gui2/actions/choose_library.py
index f3960669b3..e2638d6bb2 100644
--- a/src/calibre/gui2/actions/choose_library.py
+++ b/src/calibre/gui2/actions/choose_library.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/convert.py b/src/calibre/gui2/actions/convert.py
index 1063e729c7..946c72d50a 100644
--- a/src/calibre/gui2/actions/convert.py
+++ b/src/calibre/gui2/actions/convert.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/copy_to_library.py b/src/calibre/gui2/actions/copy_to_library.py
index 64889cf945..e8f6f9c227 100644
--- a/src/calibre/gui2/actions/copy_to_library.py
+++ b/src/calibre/gui2/actions/copy_to_library.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/delete.py b/src/calibre/gui2/actions/delete.py
index f2ad6ca4b6..6577812fc0 100644
--- a/src/calibre/gui2/actions/delete.py
+++ b/src/calibre/gui2/actions/delete.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/device.py b/src/calibre/gui2/actions/device.py
index 8928b5febc..09920d42b2 100644
--- a/src/calibre/gui2/actions/device.py
+++ b/src/calibre/gui2/actions/device.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/edit_collections.py b/src/calibre/gui2/actions/edit_collections.py
index 2428bd42d9..19c281d712 100644
--- a/src/calibre/gui2/actions/edit_collections.py
+++ b/src/calibre/gui2/actions/edit_collections.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/edit_metadata.py b/src/calibre/gui2/actions/edit_metadata.py
index 52113ef5c7..d27aebb4ad 100644
--- a/src/calibre/gui2/actions/edit_metadata.py
+++ b/src/calibre/gui2/actions/edit_metadata.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/embed.py b/src/calibre/gui2/actions/embed.py
index 8baea5f958..65016db497 100644
--- a/src/calibre/gui2/actions/embed.py
+++ b/src/calibre/gui2/actions/embed.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/fetch_news.py b/src/calibre/gui2/actions/fetch_news.py
index a2e263a5cf..cfc860f0be 100644
--- a/src/calibre/gui2/actions/fetch_news.py
+++ b/src/calibre/gui2/actions/fetch_news.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/help.py b/src/calibre/gui2/actions/help.py
index c1c6176146..e8bf9832e5 100644
--- a/src/calibre/gui2/actions/help.py
+++ b/src/calibre/gui2/actions/help.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/mark_books.py b/src/calibre/gui2/actions/mark_books.py
index 3e967c6581..83f9841b66 100644
--- a/src/calibre/gui2/actions/mark_books.py
+++ b/src/calibre/gui2/actions/mark_books.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/match_books.py b/src/calibre/gui2/actions/match_books.py
index a1240018c5..cff2add270 100644
--- a/src/calibre/gui2/actions/match_books.py
+++ b/src/calibre/gui2/actions/match_books.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/next_match.py b/src/calibre/gui2/actions/next_match.py
index 648e9f856d..f87d3e9289 100644
--- a/src/calibre/gui2/actions/next_match.py
+++ b/src/calibre/gui2/actions/next_match.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/open.py b/src/calibre/gui2/actions/open.py
index 73ddc4768e..6447f29a8f 100644
--- a/src/calibre/gui2/actions/open.py
+++ b/src/calibre/gui2/actions/open.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/plugin_updates.py b/src/calibre/gui2/actions/plugin_updates.py
index c24723a887..d22c5a2693 100644
--- a/src/calibre/gui2/actions/plugin_updates.py
+++ b/src/calibre/gui2/actions/plugin_updates.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Grant Drake <grant.drake@gmail.com>'
diff --git a/src/calibre/gui2/actions/polish.py b/src/calibre/gui2/actions/polish.py
index dfb4e73148..e1c3676c07 100644
--- a/src/calibre/gui2/actions/polish.py
+++ b/src/calibre/gui2/actions/polish.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/preferences.py b/src/calibre/gui2/actions/preferences.py
index 4656885c8e..b9e120b4c1 100644
--- a/src/calibre/gui2/actions/preferences.py
+++ b/src/calibre/gui2/actions/preferences.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/random.py b/src/calibre/gui2/actions/random.py
index cde02427f7..dc2a8a3728 100644
--- a/src/calibre/gui2/actions/random.py
+++ b/src/calibre/gui2/actions/random.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/restart.py b/src/calibre/gui2/actions/restart.py
index 8428f69d33..36ba43b3a4 100644
--- a/src/calibre/gui2/actions/restart.py
+++ b/src/calibre/gui2/actions/restart.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/save_to_disk.py b/src/calibre/gui2/actions/save_to_disk.py
index b4818591e0..18ad774ae0 100644
--- a/src/calibre/gui2/actions/save_to_disk.py
+++ b/src/calibre/gui2/actions/save_to_disk.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/show_book_details.py b/src/calibre/gui2/actions/show_book_details.py
index 8d62f67c86..75d4eef7f2 100644
--- a/src/calibre/gui2/actions/show_book_details.py
+++ b/src/calibre/gui2/actions/show_book_details.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/show_quickview.py b/src/calibre/gui2/actions/show_quickview.py
index f404207a3c..fccb8ac1b1 100644
--- a/src/calibre/gui2/actions/show_quickview.py
+++ b/src/calibre/gui2/actions/show_quickview.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/show_template_tester.py b/src/calibre/gui2/actions/show_template_tester.py
index af78359570..371fe16d71 100644
--- a/src/calibre/gui2/actions/show_template_tester.py
+++ b/src/calibre/gui2/actions/show_template_tester.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/similar_books.py b/src/calibre/gui2/actions/similar_books.py
index 879d888648..c655f05700 100644
--- a/src/calibre/gui2/actions/similar_books.py
+++ b/src/calibre/gui2/actions/similar_books.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/sort.py b/src/calibre/gui2/actions/sort.py
index 890ac4c709..99d988370f 100644
--- a/src/calibre/gui2/actions/sort.py
+++ b/src/calibre/gui2/actions/sort.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/store.py b/src/calibre/gui2/actions/store.py
index 7b889ec51b..5d4681b5e5 100644
--- a/src/calibre/gui2/actions/store.py
+++ b/src/calibre/gui2/actions/store.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/actions/tag_mapper.py b/src/calibre/gui2/actions/tag_mapper.py
index 785ba911f8..770666b955 100644
--- a/src/calibre/gui2/actions/tag_mapper.py
+++ b/src/calibre/gui2/actions/tag_mapper.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from polyglot.builtins import iteritems, map, range
 
 from calibre.gui2 import gprefs
diff --git a/src/calibre/gui2/actions/toc_edit.py b/src/calibre/gui2/actions/toc_edit.py
index 0cd79d27b4..91819999cd 100644
--- a/src/calibre/gui2/actions/toc_edit.py
+++ b/src/calibre/gui2/actions/toc_edit.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/tweak_epub.py b/src/calibre/gui2/actions/tweak_epub.py
index 5cab1405cd..405b2eea5a 100644
--- a/src/calibre/gui2/actions/tweak_epub.py
+++ b/src/calibre/gui2/actions/tweak_epub.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/unpack_book.py b/src/calibre/gui2/actions/unpack_book.py
index 1fa4c96fb8..278cb968e0 100644
--- a/src/calibre/gui2/actions/unpack_book.py
+++ b/src/calibre/gui2/actions/unpack_book.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/view.py b/src/calibre/gui2/actions/view.py
index 6592277465..23c880a871 100644
--- a/src/calibre/gui2/actions/view.py
+++ b/src/calibre/gui2/actions/view.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/actions/virtual_library.py b/src/calibre/gui2/actions/virtual_library.py
index 4efdf345ef..c17b08b49e 100644
--- a/src/calibre/gui2/actions/virtual_library.py
+++ b/src/calibre/gui2/actions/virtual_library.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import QToolButton, QAction
 
diff --git a/src/calibre/gui2/add.py b/src/calibre/gui2/add.py
index 374d579b57..1e440c9ffa 100644
--- a/src/calibre/gui2/add.py
+++ b/src/calibre/gui2/add.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/add_filters.py b/src/calibre/gui2/add_filters.py
index 9e750de11a..06bbea5e42 100644
--- a/src/calibre/gui2/add_filters.py
+++ b/src/calibre/gui2/add_filters.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import OrderedDict
 from polyglot.builtins import map, unicode_type
diff --git a/src/calibre/gui2/author_mapper.py b/src/calibre/gui2/author_mapper.py
index d83889156d..0d5a436814 100644
--- a/src/calibre/gui2/author_mapper.py
+++ b/src/calibre/gui2/author_mapper.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import OrderedDict
 
diff --git a/src/calibre/gui2/auto_add.py b/src/calibre/gui2/auto_add.py
index 34a01ec4b4..ccd0f12d30 100644
--- a/src/calibre/gui2/auto_add.py
+++ b/src/calibre/gui2/auto_add.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/bars.py b/src/calibre/gui2/bars.py
index d49a5472f9..f4aec49b84 100644
--- a/src/calibre/gui2/bars.py
+++ b/src/calibre/gui2/bars.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/book_details.py b/src/calibre/gui2/book_details.py
index 3a9c2fb5c4..fd9e24cb08 100644
--- a/src/calibre/gui2/book_details.py
+++ b/src/calibre/gui2/book_details.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re, os
 from collections import namedtuple
diff --git a/src/calibre/gui2/catalog/catalog_bibtex.py b/src/calibre/gui2/catalog/catalog_bibtex.py
index 03d262c4ac..dc279c36aa 100644
--- a/src/calibre/gui2/catalog/catalog_bibtex.py
+++ b/src/calibre/gui2/catalog/catalog_bibtex.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/catalog/catalog_csv_xml.py b/src/calibre/gui2/catalog/catalog_csv_xml.py
index 7a63e1bbb9..903656ddb3 100644
--- a/src/calibre/gui2/catalog/catalog_csv_xml.py
+++ b/src/calibre/gui2/catalog/catalog_csv_xml.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/catalog/catalog_epub_mobi.py b/src/calibre/gui2/catalog/catalog_epub_mobi.py
index 96935b0977..0db35a4353 100644
--- a/src/calibre/gui2/catalog/catalog_epub_mobi.py
+++ b/src/calibre/gui2/catalog/catalog_epub_mobi.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/changes.py b/src/calibre/gui2/changes.py
index f3f1977868..6a49327eda 100644
--- a/src/calibre/gui2/changes.py
+++ b/src/calibre/gui2/changes.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.srv.changes import (
     BooksAdded, BooksDeleted, FormatsAdded, FormatsRemoved, MetadataChanged,
diff --git a/src/calibre/gui2/comments_editor.py b/src/calibre/gui2/comments_editor.py
index 3660dbeafd..071cecdb26 100644
--- a/src/calibre/gui2/comments_editor.py
+++ b/src/calibre/gui2/comments_editor.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import re
diff --git a/src/calibre/gui2/complete2.py b/src/calibre/gui2/complete2.py
index a3b3ca88bb..42d90a0d30 100644
--- a/src/calibre/gui2/complete2.py
+++ b/src/calibre/gui2/complete2.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/__init__.py b/src/calibre/gui2/convert/__init__.py
index a9c2e10420..c66bc6ec89 100644
--- a/src/calibre/gui2/convert/__init__.py
+++ b/src/calibre/gui2/convert/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/azw3_output.py b/src/calibre/gui2/convert/azw3_output.py
index 375e3c7687..0efc9aa2df 100644
--- a/src/calibre/gui2/convert/azw3_output.py
+++ b/src/calibre/gui2/convert/azw3_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/bulk.py b/src/calibre/gui2/convert/bulk.py
index ff9a197c0f..aacfc15869 100644
--- a/src/calibre/gui2/convert/bulk.py
+++ b/src/calibre/gui2/convert/bulk.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/comic_input.py b/src/calibre/gui2/convert/comic_input.py
index 0c9a8b0fd2..af9da5b1e5 100644
--- a/src/calibre/gui2/convert/comic_input.py
+++ b/src/calibre/gui2/convert/comic_input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/debug.py b/src/calibre/gui2/convert/debug.py
index f39a9d7599..b3378b6fb6 100644
--- a/src/calibre/gui2/convert/debug.py
+++ b/src/calibre/gui2/convert/debug.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/docx_input.py b/src/calibre/gui2/convert/docx_input.py
index dbe423faa9..19ed13b7ff 100644
--- a/src/calibre/gui2/convert/docx_input.py
+++ b/src/calibre/gui2/convert/docx_input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/docx_output.py b/src/calibre/gui2/convert/docx_output.py
index 6633152550..f4a740b797 100644
--- a/src/calibre/gui2/convert/docx_output.py
+++ b/src/calibre/gui2/convert/docx_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/epub_output.py b/src/calibre/gui2/convert/epub_output.py
index 1a4bba8a5f..bafdba58e4 100644
--- a/src/calibre/gui2/convert/epub_output.py
+++ b/src/calibre/gui2/convert/epub_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/fb2_input.py b/src/calibre/gui2/convert/fb2_input.py
index 076c40cbc7..a905f6b71c 100644
--- a/src/calibre/gui2/convert/fb2_input.py
+++ b/src/calibre/gui2/convert/fb2_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/fb2_output.py b/src/calibre/gui2/convert/fb2_output.py
index 937737a1b9..a340a23dad 100644
--- a/src/calibre/gui2/convert/fb2_output.py
+++ b/src/calibre/gui2/convert/fb2_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/font_key.py b/src/calibre/gui2/convert/font_key.py
index 5783303b2d..d62954b201 100644
--- a/src/calibre/gui2/convert/font_key.py
+++ b/src/calibre/gui2/convert/font_key.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/gui_conversion.py b/src/calibre/gui2/convert/gui_conversion.py
index aed1ca2774..c459c7255f 100644
--- a/src/calibre/gui2/convert/gui_conversion.py
+++ b/src/calibre/gui2/convert/gui_conversion.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/heuristics.py b/src/calibre/gui2/convert/heuristics.py
index e83da26eca..cd83dbfc86 100644
--- a/src/calibre/gui2/convert/heuristics.py
+++ b/src/calibre/gui2/convert/heuristics.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/htmlz_output.py b/src/calibre/gui2/convert/htmlz_output.py
index 524d2e8536..aabbe44934 100644
--- a/src/calibre/gui2/convert/htmlz_output.py
+++ b/src/calibre/gui2/convert/htmlz_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/look_and_feel.py b/src/calibre/gui2/convert/look_and_feel.py
index 3fe690bbdd..dbc6c286fb 100644
--- a/src/calibre/gui2/convert/look_and_feel.py
+++ b/src/calibre/gui2/convert/look_and_feel.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/lrf_output.py b/src/calibre/gui2/convert/lrf_output.py
index 494ee345fe..8f10ff0878 100644
--- a/src/calibre/gui2/convert/lrf_output.py
+++ b/src/calibre/gui2/convert/lrf_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/metadata.py b/src/calibre/gui2/convert/metadata.py
index e6a86963aa..d3e5cbf284 100644
--- a/src/calibre/gui2/convert/metadata.py
+++ b/src/calibre/gui2/convert/metadata.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/mobi_output.py b/src/calibre/gui2/convert/mobi_output.py
index 45378cb2d9..398f5f7934 100644
--- a/src/calibre/gui2/convert/mobi_output.py
+++ b/src/calibre/gui2/convert/mobi_output.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/page_setup.py b/src/calibre/gui2/convert/page_setup.py
index 26f8628ac1..1887e29458 100644
--- a/src/calibre/gui2/convert/page_setup.py
+++ b/src/calibre/gui2/convert/page_setup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/pdb_output.py b/src/calibre/gui2/convert/pdb_output.py
index a48e2056bf..c7937ce36f 100644
--- a/src/calibre/gui2/convert/pdb_output.py
+++ b/src/calibre/gui2/convert/pdb_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/pdf_input.py b/src/calibre/gui2/convert/pdf_input.py
index 764e29417f..4bb40c55cc 100644
--- a/src/calibre/gui2/convert/pdf_input.py
+++ b/src/calibre/gui2/convert/pdf_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/pdf_output.py b/src/calibre/gui2/convert/pdf_output.py
index 280d14b95f..5c98b19442 100644
--- a/src/calibre/gui2/convert/pdf_output.py
+++ b/src/calibre/gui2/convert/pdf_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/pml_output.py b/src/calibre/gui2/convert/pml_output.py
index 8102697e75..6d637e8eea 100644
--- a/src/calibre/gui2/convert/pml_output.py
+++ b/src/calibre/gui2/convert/pml_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/rb_output.py b/src/calibre/gui2/convert/rb_output.py
index 4414a0ddd7..1e0e7761e0 100644
--- a/src/calibre/gui2/convert/rb_output.py
+++ b/src/calibre/gui2/convert/rb_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/regex_builder.py b/src/calibre/gui2/convert/regex_builder.py
index 9ac5385dbd..740986dff1 100644
--- a/src/calibre/gui2/convert/regex_builder.py
+++ b/src/calibre/gui2/convert/regex_builder.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/rtf_input.py b/src/calibre/gui2/convert/rtf_input.py
index 04d94ffd0b..9243a07c33 100644
--- a/src/calibre/gui2/convert/rtf_input.py
+++ b/src/calibre/gui2/convert/rtf_input.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/search_and_replace.py b/src/calibre/gui2/convert/search_and_replace.py
index c53440ee50..0cce946ed7 100644
--- a/src/calibre/gui2/convert/search_and_replace.py
+++ b/src/calibre/gui2/convert/search_and_replace.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>, 2012 Eli Algranti <idea00@hotmail.com>'
diff --git a/src/calibre/gui2/convert/single.py b/src/calibre/gui2/convert/single.py
index 763e972bb7..6d0d5240a6 100644
--- a/src/calibre/gui2/convert/single.py
+++ b/src/calibre/gui2/convert/single.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2009, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import shutil
 
diff --git a/src/calibre/gui2/convert/snb_output.py b/src/calibre/gui2/convert/snb_output.py
index b47e7eb493..dd7d917caa 100644
--- a/src/calibre/gui2/convert/snb_output.py
+++ b/src/calibre/gui2/convert/snb_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2010, Li Fanxi <lifanxi@freemindworld.com>'
diff --git a/src/calibre/gui2/convert/structure_detection.py b/src/calibre/gui2/convert/structure_detection.py
index 418dabec19..6be65cdb89 100644
--- a/src/calibre/gui2/convert/structure_detection.py
+++ b/src/calibre/gui2/convert/structure_detection.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/toc.py b/src/calibre/gui2/convert/toc.py
index f75bca1279..2a7961548f 100644
--- a/src/calibre/gui2/convert/toc.py
+++ b/src/calibre/gui2/convert/toc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/convert/txt_input.py b/src/calibre/gui2/convert/txt_input.py
index 01c7b5d42e..1838b915e0 100644
--- a/src/calibre/gui2/convert/txt_input.py
+++ b/src/calibre/gui2/convert/txt_input.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/txt_output.py b/src/calibre/gui2/convert/txt_output.py
index 5837ce9b2f..1e03381a44 100644
--- a/src/calibre/gui2/convert/txt_output.py
+++ b/src/calibre/gui2/convert/txt_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/txtz_output.py b/src/calibre/gui2/convert/txtz_output.py
index 0d764a76de..caa85147d5 100644
--- a/src/calibre/gui2/convert/txtz_output.py
+++ b/src/calibre/gui2/convert/txtz_output.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/convert/xpath_wizard.py b/src/calibre/gui2/convert/xpath_wizard.py
index 9789462947..b5a7ca05b2 100644
--- a/src/calibre/gui2/convert/xpath_wizard.py
+++ b/src/calibre/gui2/convert/xpath_wizard.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/cover_flow.py b/src/calibre/gui2/cover_flow.py
index a3a397dccf..fae8dbeeef 100644
--- a/src/calibre/gui2/cover_flow.py
+++ b/src/calibre/gui2/cover_flow.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/gui2/covers.py b/src/calibre/gui2/covers.py
index cb7de3af2e..a82c329766 100644
--- a/src/calibre/gui2/covers.py
+++ b/src/calibre/gui2/covers.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/css_transform_rules.py b/src/calibre/gui2/css_transform_rules.py
index 6f46595d55..1c461422cd 100644
--- a/src/calibre/gui2/css_transform_rules.py
+++ b/src/calibre/gui2/css_transform_rules.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import (
     QWidget, QVBoxLayout, QHBoxLayout, QLabel, QComboBox, QLineEdit,
diff --git a/src/calibre/gui2/custom_column_widgets.py b/src/calibre/gui2/custom_column_widgets.py
index b0421949c9..1d203dd55b 100644
--- a/src/calibre/gui2/custom_column_widgets.py
+++ b/src/calibre/gui2/custom_column_widgets.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/dbus_export/__init__.py b/src/calibre/gui2/dbus_export/__init__.py
index 996f48f52a..a33a31c735 100644
--- a/src/calibre/gui2/dbus_export/__init__.py
+++ b/src/calibre/gui2/dbus_export/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dbus_export/demo.py b/src/calibre/gui2/dbus_export/demo.py
index 7aac2681a2..aac3e88236 100644
--- a/src/calibre/gui2/dbus_export/demo.py
+++ b/src/calibre/gui2/dbus_export/demo.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dbus_export/gtk.py b/src/calibre/gui2/dbus_export/gtk.py
index 8d101ec49c..2b7c387f40 100644
--- a/src/calibre/gui2/dbus_export/gtk.py
+++ b/src/calibre/gui2/dbus_export/gtk.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dbus_export/menu.py b/src/calibre/gui2/dbus_export/menu.py
index 1f0d5e9826..3187b9bb59 100644
--- a/src/calibre/gui2/dbus_export/menu.py
+++ b/src/calibre/gui2/dbus_export/menu.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dbus_export/menu2.py b/src/calibre/gui2/dbus_export/menu2.py
index 87381c2a39..531146d16f 100644
--- a/src/calibre/gui2/dbus_export/menu2.py
+++ b/src/calibre/gui2/dbus_export/menu2.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dbus_export/tray.py b/src/calibre/gui2/dbus_export/tray.py
index c4db698060..36a10e2150 100644
--- a/src/calibre/gui2/dbus_export/tray.py
+++ b/src/calibre/gui2/dbus_export/tray.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dbus_export/utils.py b/src/calibre/gui2/dbus_export/utils.py
index a0f45a69de..7e0d499aff 100644
--- a/src/calibre/gui2/dbus_export/utils.py
+++ b/src/calibre/gui2/dbus_export/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dbus_export/widgets.py b/src/calibre/gui2/dbus_export/widgets.py
index aa950a4fdb..9930d76ac1 100644
--- a/src/calibre/gui2/dbus_export/widgets.py
+++ b/src/calibre/gui2/dbus_export/widgets.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/device.py b/src/calibre/gui2/device.py
index 6c1fa0c4fb..1bca2347d5 100644
--- a/src/calibre/gui2/device.py
+++ b/src/calibre/gui2/device.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/device_drivers/configwidget.py b/src/calibre/gui2/device_drivers/configwidget.py
index 6948a29431..c8b5efb062 100644
--- a/src/calibre/gui2/device_drivers/configwidget.py
+++ b/src/calibre/gui2/device_drivers/configwidget.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/device_drivers/mtp_config.py b/src/calibre/gui2/device_drivers/mtp_config.py
index 61d17fe9bd..3c6fde9d38 100644
--- a/src/calibre/gui2/device_drivers/mtp_config.py
+++ b/src/calibre/gui2/device_drivers/mtp_config.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/device_drivers/mtp_folder_browser.py b/src/calibre/gui2/device_drivers/mtp_folder_browser.py
index 6a9a1a7737..cc5062c7ff 100644
--- a/src/calibre/gui2/device_drivers/mtp_folder_browser.py
+++ b/src/calibre/gui2/device_drivers/mtp_folder_browser.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/__init__.py b/src/calibre/gui2/dialogs/__init__.py
index 891411dd71..b2d51aa5f5 100644
--- a/src/calibre/gui2/dialogs/__init__.py
+++ b/src/calibre/gui2/dialogs/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/add_empty_book.py b/src/calibre/gui2/dialogs/add_empty_book.py
index ce87b28a93..ea4bc0ef3c 100644
--- a/src/calibre/gui2/dialogs/add_empty_book.py
+++ b/src/calibre/gui2/dialogs/add_empty_book.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/dialogs/add_from_isbn.py b/src/calibre/gui2/dialogs/add_from_isbn.py
index 4f8fca65a5..f2a5ec164f 100644
--- a/src/calibre/gui2/dialogs/add_from_isbn.py
+++ b/src/calibre/gui2/dialogs/add_from_isbn.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/authors_edit.py b/src/calibre/gui2/dialogs/authors_edit.py
index 76b87897b8..d5f8b81a86 100644
--- a/src/calibre/gui2/dialogs/authors_edit.py
+++ b/src/calibre/gui2/dialogs/authors_edit.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/book_info.py b/src/calibre/gui2/dialogs/book_info.py
index d1c514b339..c35bcde615 100644
--- a/src/calibre/gui2/dialogs/book_info.py
+++ b/src/calibre/gui2/dialogs/book_info.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import textwrap
 
diff --git a/src/calibre/gui2/dialogs/catalog.py b/src/calibre/gui2/dialogs/catalog.py
index de0e838337..b03f102a32 100644
--- a/src/calibre/gui2/dialogs/catalog.py
+++ b/src/calibre/gui2/dialogs/catalog.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/check_library.py b/src/calibre/gui2/dialogs/check_library.py
index 2b885ca1a3..241d2d51b3 100644
--- a/src/calibre/gui2/dialogs/check_library.py
+++ b/src/calibre/gui2/dialogs/check_library.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/dialogs/choose_format.py b/src/calibre/gui2/dialogs/choose_format.py
index f8c3d54d1f..b0eb82aa33 100644
--- a/src/calibre/gui2/dialogs/choose_format.py
+++ b/src/calibre/gui2/dialogs/choose_format.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/choose_format_device.py b/src/calibre/gui2/dialogs/choose_format_device.py
index 76b0c2e3c1..132df5f37b 100644
--- a/src/calibre/gui2/dialogs/choose_format_device.py
+++ b/src/calibre/gui2/dialogs/choose_format_device.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
diff --git a/src/calibre/gui2/dialogs/choose_library.py b/src/calibre/gui2/dialogs/choose_library.py
index 1ac0ff4ce1..da2d51fcc6 100644
--- a/src/calibre/gui2/dialogs/choose_library.py
+++ b/src/calibre/gui2/dialogs/choose_library.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/choose_plugin_toolbars.py b/src/calibre/gui2/dialogs/choose_plugin_toolbars.py
index 7ee151f66b..12dea16a91 100644
--- a/src/calibre/gui2/dialogs/choose_plugin_toolbars.py
+++ b/src/calibre/gui2/dialogs/choose_plugin_toolbars.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/dialogs/comments_dialog.py b/src/calibre/gui2/dialogs/comments_dialog.py
index 557887fe4e..efa4833787 100644
--- a/src/calibre/gui2/dialogs/comments_dialog.py
+++ b/src/calibre/gui2/dialogs/comments_dialog.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/dialogs/confirm_delete.py b/src/calibre/gui2/dialogs/confirm_delete.py
index 5dd8feddd0..93ac5c1425 100644
--- a/src/calibre/gui2/dialogs/confirm_delete.py
+++ b/src/calibre/gui2/dialogs/confirm_delete.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/gui2/dialogs/confirm_delete_location.py b/src/calibre/gui2/dialogs/confirm_delete_location.py
index d280264699..a605e56e81 100644
--- a/src/calibre/gui2/dialogs/confirm_delete_location.py
+++ b/src/calibre/gui2/dialogs/confirm_delete_location.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net' \
diff --git a/src/calibre/gui2/dialogs/confirm_merge.py b/src/calibre/gui2/dialogs/confirm_merge.py
index f7eaa12639..a3d7fa91bd 100644
--- a/src/calibre/gui2/dialogs/confirm_merge.py
+++ b/src/calibre/gui2/dialogs/confirm_merge.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/conversion_error.py b/src/calibre/gui2/dialogs/conversion_error.py
index e876120743..2bf85113a2 100644
--- a/src/calibre/gui2/dialogs/conversion_error.py
+++ b/src/calibre/gui2/dialogs/conversion_error.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/custom_recipes.py b/src/calibre/gui2/dialogs/custom_recipes.py
index ba3d6ed9c6..7f49ef86ee 100644
--- a/src/calibre/gui2/dialogs/custom_recipes.py
+++ b/src/calibre/gui2/dialogs/custom_recipes.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/delete_matching_from_device.py b/src/calibre/gui2/dialogs/delete_matching_from_device.py
index 456d3b042e..0d04650d2d 100644
--- a/src/calibre/gui2/dialogs/delete_matching_from_device.py
+++ b/src/calibre/gui2/dialogs/delete_matching_from_device.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/dialogs/device_category_editor.py b/src/calibre/gui2/dialogs/device_category_editor.py
index 3addf5e8c4..c0edd8378b 100644
--- a/src/calibre/gui2/dialogs/device_category_editor.py
+++ b/src/calibre/gui2/dialogs/device_category_editor.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/drm_error.py b/src/calibre/gui2/dialogs/drm_error.py
index f24098f314..ba5d45c7eb 100644
--- a/src/calibre/gui2/dialogs/drm_error.py
+++ b/src/calibre/gui2/dialogs/drm_error.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/duplicates.py b/src/calibre/gui2/dialogs/duplicates.py
index f7c076aef5..57c9402e1b 100644
--- a/src/calibre/gui2/dialogs/duplicates.py
+++ b/src/calibre/gui2/dialogs/duplicates.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/edit_authors_dialog.py b/src/calibre/gui2/dialogs/edit_authors_dialog.py
index 7c41a15413..80afed8788 100644
--- a/src/calibre/gui2/dialogs/edit_authors_dialog.py
+++ b/src/calibre/gui2/dialogs/edit_authors_dialog.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/dialogs/exim.py b/src/calibre/gui2/dialogs/exim.py
index 9834b810d7..0509e6d844 100644
--- a/src/calibre/gui2/dialogs/exim.py
+++ b/src/calibre/gui2/dialogs/exim.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from functools import partial
 from threading import Thread, Event
 import os, stat
diff --git a/src/calibre/gui2/dialogs/match_books.py b/src/calibre/gui2/dialogs/match_books.py
index b63e315ea0..395f5da753 100644
--- a/src/calibre/gui2/dialogs/match_books.py
+++ b/src/calibre/gui2/dialogs/match_books.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/gui2/dialogs/message_box.py b/src/calibre/gui2/dialogs/message_box.py
index 35e46b3324..0ba49cbe64 100644
--- a/src/calibre/gui2/dialogs/message_box.py
+++ b/src/calibre/gui2/dialogs/message_box.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/metadata_bulk.py b/src/calibre/gui2/dialogs/metadata_bulk.py
index 1682178417..67f500a74a 100644
--- a/src/calibre/gui2/dialogs/metadata_bulk.py
+++ b/src/calibre/gui2/dialogs/metadata_bulk.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re, numbers
 from collections import defaultdict, namedtuple
diff --git a/src/calibre/gui2/dialogs/opml.py b/src/calibre/gui2/dialogs/opml.py
index 92d1569271..ad384d2bf1 100644
--- a/src/calibre/gui2/dialogs/opml.py
+++ b/src/calibre/gui2/dialogs/opml.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/password.py b/src/calibre/gui2/dialogs/password.py
index 6c1d3580a6..585a00da63 100644
--- a/src/calibre/gui2/dialogs/password.py
+++ b/src/calibre/gui2/dialogs/password.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/plugin_updater.py b/src/calibre/gui2/dialogs/plugin_updater.py
index a439e84b79..1068cb0999 100644
--- a/src/calibre/gui2/dialogs/plugin_updater.py
+++ b/src/calibre/gui2/dialogs/plugin_updater.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Grant Drake <grant.drake@gmail.com>'
diff --git a/src/calibre/gui2/dialogs/progress.py b/src/calibre/gui2/dialogs/progress.py
index a86fb31b24..35c5dfefbf 100644
--- a/src/calibre/gui2/dialogs/progress.py
+++ b/src/calibre/gui2/dialogs/progress.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/gui2/dialogs/quickview.py b/src/calibre/gui2/dialogs/quickview.py
index 5e740d9c6d..c17c3f71b5 100644
--- a/src/calibre/gui2/dialogs/quickview.py
+++ b/src/calibre/gui2/dialogs/quickview.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/gui2/dialogs/restore_library.py b/src/calibre/gui2/dialogs/restore_library.py
index 6bc3ea5a15..f4353fe4a2 100644
--- a/src/calibre/gui2/dialogs/restore_library.py
+++ b/src/calibre/gui2/dialogs/restore_library.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2011, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import (QDialog, QLabel, QVBoxLayout, QDialogButtonBox,
         QProgressBar, QSize, QTimer, pyqtSignal, Qt)
diff --git a/src/calibre/gui2/dialogs/saved_search_editor.py b/src/calibre/gui2/dialogs/saved_search_editor.py
index 42b26005d3..efaa255692 100644
--- a/src/calibre/gui2/dialogs/saved_search_editor.py
+++ b/src/calibre/gui2/dialogs/saved_search_editor.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 from PyQt5.Qt import (
diff --git a/src/calibre/gui2/dialogs/scheduler.py b/src/calibre/gui2/dialogs/scheduler.py
index ce2464e6ca..75e9232458 100644
--- a/src/calibre/gui2/dialogs/scheduler.py
+++ b/src/calibre/gui2/dialogs/scheduler.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/gui2/dialogs/search.py b/src/calibre/gui2/dialogs/search.py
index f3cace7f82..ba1d015e72 100644
--- a/src/calibre/gui2/dialogs/search.py
+++ b/src/calibre/gui2/dialogs/search.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/select_formats.py b/src/calibre/gui2/dialogs/select_formats.py
index 6bd57a4ecf..14b68282d6 100644
--- a/src/calibre/gui2/dialogs/select_formats.py
+++ b/src/calibre/gui2/dialogs/select_formats.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/smartdevice.py b/src/calibre/gui2/dialogs/smartdevice.py
index 9b303fa20e..b79e899053 100644
--- a/src/calibre/gui2/dialogs/smartdevice.py
+++ b/src/calibre/gui2/dialogs/smartdevice.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 
diff --git a/src/calibre/gui2/dialogs/tag_categories.py b/src/calibre/gui2/dialogs/tag_categories.py
index efb840b169..e6d8dd424a 100644
--- a/src/calibre/gui2/dialogs/tag_categories.py
+++ b/src/calibre/gui2/dialogs/tag_categories.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/tag_editor.py b/src/calibre/gui2/dialogs/tag_editor.py
index 54ff3951b3..f193775864 100644
--- a/src/calibre/gui2/dialogs/tag_editor.py
+++ b/src/calibre/gui2/dialogs/tag_editor.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/tag_list_editor.py b/src/calibre/gui2/dialogs/tag_list_editor.py
index 7bac1b02f3..f74180830f 100644
--- a/src/calibre/gui2/dialogs/tag_list_editor.py
+++ b/src/calibre/gui2/dialogs/tag_list_editor.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import (Qt, QDialog, QTableWidgetItem, QIcon, QByteArray, QSize,
                       QDialogButtonBox, QTableWidget, QItemDelegate, QApplication,
diff --git a/src/calibre/gui2/dialogs/template_dialog.py b/src/calibre/gui2/dialogs/template_dialog.py
index d86103e4d3..5f94525f0f 100644
--- a/src/calibre/gui2/dialogs/template_dialog.py
+++ b/src/calibre/gui2/dialogs/template_dialog.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/dialogs/template_line_editor.py b/src/calibre/gui2/dialogs/template_line_editor.py
index e3dcf6044a..e3f27402b4 100644
--- a/src/calibre/gui2/dialogs/template_line_editor.py
+++ b/src/calibre/gui2/dialogs/template_line_editor.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/dialogs/trim_image.py b/src/calibre/gui2/dialogs/trim_image.py
index f7c16a9c46..576faf4ea8 100644
--- a/src/calibre/gui2/dialogs/trim_image.py
+++ b/src/calibre/gui2/dialogs/trim_image.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/dnd.py b/src/calibre/gui2/dnd.py
index 5c9aa06de5..a8d3971da9 100644
--- a/src/calibre/gui2/dnd.py
+++ b/src/calibre/gui2/dnd.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/ebook_download.py b/src/calibre/gui2/ebook_download.py
index 25899cd210..eb6acc31af 100644
--- a/src/calibre/gui2/ebook_download.py
+++ b/src/calibre/gui2/ebook_download.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/email.py b/src/calibre/gui2/email.py
index 9b18dba840..d6dacc6a61 100644
--- a/src/calibre/gui2/email.py
+++ b/src/calibre/gui2/email.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/font_family_chooser.py b/src/calibre/gui2/font_family_chooser.py
index 54a9eeafca..f92d998ad3 100644
--- a/src/calibre/gui2/font_family_chooser.py
+++ b/src/calibre/gui2/font_family_chooser.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/gestures.py b/src/calibre/gui2/gestures.py
index 34dfa3844d..b25600344b 100644
--- a/src/calibre/gui2/gestures.py
+++ b/src/calibre/gui2/gestures.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys, os
 
diff --git a/src/calibre/gui2/icon_theme.py b/src/calibre/gui2/icon_theme.py
index 1690cef6b3..278e147eb1 100644
--- a/src/calibre/gui2/icon_theme.py
+++ b/src/calibre/gui2/icon_theme.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/image_popup.py b/src/calibre/gui2/image_popup.py
index ef0d4f7354..5ba8eaace0 100644
--- a/src/calibre/gui2/image_popup.py
+++ b/src/calibre/gui2/image_popup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/init.py b/src/calibre/gui2/init.py
index 78a9512eb1..aa174d45b4 100644
--- a/src/calibre/gui2/init.py
+++ b/src/calibre/gui2/init.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/job_indicator.py b/src/calibre/gui2/job_indicator.py
index f3986094ac..59f35c469e 100644
--- a/src/calibre/gui2/job_indicator.py
+++ b/src/calibre/gui2/job_indicator.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/jobs.py b/src/calibre/gui2/jobs.py
index 00db8fb37f..ef7c13be13 100644
--- a/src/calibre/gui2/jobs.py
+++ b/src/calibre/gui2/jobs.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/gui2/keyboard.py b/src/calibre/gui2/keyboard.py
index 8e59ef335a..f4b4ce9fc9 100644
--- a/src/calibre/gui2/keyboard.py
+++ b/src/calibre/gui2/keyboard.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/languages.py b/src/calibre/gui2/languages.py
index 33b6c3d42b..ed38960d17 100644
--- a/src/calibre/gui2/languages.py
+++ b/src/calibre/gui2/languages.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/layout.py b/src/calibre/gui2/layout.py
index 6efb5808a2..56376d9f48 100644
--- a/src/calibre/gui2/layout.py
+++ b/src/calibre/gui2/layout.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/layout_menu.py b/src/calibre/gui2/layout_menu.py
index c19c38f5e1..c0319384b6 100644
--- a/src/calibre/gui2/layout_menu.py
+++ b/src/calibre/gui2/layout_menu.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import (
     QFontMetrics, QHBoxLayout, QIcon, QMenu, QPainter, QPushButton, QSize,
diff --git a/src/calibre/gui2/library/__init__.py b/src/calibre/gui2/library/__init__.py
index 645932c8b9..086cf66194 100644
--- a/src/calibre/gui2/library/__init__.py
+++ b/src/calibre/gui2/library/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/library/alternate_views.py b/src/calibre/gui2/library/alternate_views.py
index 32f7e39a45..348eea6955 100644
--- a/src/calibre/gui2/library/alternate_views.py
+++ b/src/calibre/gui2/library/alternate_views.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/library/caches.py b/src/calibre/gui2/library/caches.py
index 04667c88b0..cb6a3a9876 100644
--- a/src/calibre/gui2/library/caches.py
+++ b/src/calibre/gui2/library/caches.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/library/delegates.py b/src/calibre/gui2/library/delegates.py
index 32f4fbe985..6b9aa2731a 100644
--- a/src/calibre/gui2/library/delegates.py
+++ b/src/calibre/gui2/library/delegates.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/library/models.py b/src/calibre/gui2/library/models.py
index 6922617486..37a7890ad2 100644
--- a/src/calibre/gui2/library/models.py
+++ b/src/calibre/gui2/library/models.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/library/views.py b/src/calibre/gui2/library/views.py
index dc687aaf7a..1828bb960f 100644
--- a/src/calibre/gui2/library/views.py
+++ b/src/calibre/gui2/library/views.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/linux_file_dialogs.py b/src/calibre/gui2/linux_file_dialogs.py
index 01ed0266b4..89bb295a76 100644
--- a/src/calibre/gui2/linux_file_dialogs.py
+++ b/src/calibre/gui2/linux_file_dialogs.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import functools
 import os
diff --git a/src/calibre/gui2/lrf_renderer/__init__.py b/src/calibre/gui2/lrf_renderer/__init__.py
index bffa3c0e04..86422d565c 100644
--- a/src/calibre/gui2/lrf_renderer/__init__.py
+++ b/src/calibre/gui2/lrf_renderer/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/lrf_renderer/bookview.py b/src/calibre/gui2/lrf_renderer/bookview.py
index 9fdbbda97d..b4cfe4a239 100644
--- a/src/calibre/gui2/lrf_renderer/bookview.py
+++ b/src/calibre/gui2/lrf_renderer/bookview.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/lrf_renderer/document.py b/src/calibre/gui2/lrf_renderer/document.py
index 653f38866c..c55e0bec96 100644
--- a/src/calibre/gui2/lrf_renderer/document.py
+++ b/src/calibre/gui2/lrf_renderer/document.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/lrf_renderer/main.py b/src/calibre/gui2/lrf_renderer/main.py
index 925fc08579..848daf1793 100644
--- a/src/calibre/gui2/lrf_renderer/main.py
+++ b/src/calibre/gui2/lrf_renderer/main.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/lrf_renderer/text.py b/src/calibre/gui2/lrf_renderer/text.py
index 7014c1be1f..e19555294f 100644
--- a/src/calibre/gui2/lrf_renderer/text.py
+++ b/src/calibre/gui2/lrf_renderer/text.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/main.py b/src/calibre/gui2/main.py
index 0b62cbbf68..1805ac6ff4 100644
--- a/src/calibre/gui2/main.py
+++ b/src/calibre/gui2/main.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import re
diff --git a/src/calibre/gui2/main_window.py b/src/calibre/gui2/main_window.py
index e55677868c..2e59cdf6e5 100644
--- a/src/calibre/gui2/main_window.py
+++ b/src/calibre/gui2/main_window.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/metadata/__init__.py b/src/calibre/gui2/metadata/__init__.py
index c63cb57432..463ad37bb2 100644
--- a/src/calibre/gui2/metadata/__init__.py
+++ b/src/calibre/gui2/metadata/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/metadata/basic_widgets.py b/src/calibre/gui2/metadata/basic_widgets.py
index 1dcd03461c..f94fe966b6 100644
--- a/src/calibre/gui2/metadata/basic_widgets.py
+++ b/src/calibre/gui2/metadata/basic_widgets.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/metadata/bulk_download.py b/src/calibre/gui2/metadata/bulk_download.py
index 36952e0768..6f06d92bf2 100644
--- a/src/calibre/gui2/metadata/bulk_download.py
+++ b/src/calibre/gui2/metadata/bulk_download.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/metadata/config.py b/src/calibre/gui2/metadata/config.py
index df64a46661..2d77dc8e4d 100644
--- a/src/calibre/gui2/metadata/config.py
+++ b/src/calibre/gui2/metadata/config.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/metadata/diff.py b/src/calibre/gui2/metadata/diff.py
index cab161c349..41c1168c0d 100644
--- a/src/calibre/gui2/metadata/diff.py
+++ b/src/calibre/gui2/metadata/diff.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/metadata/pdf_covers.py b/src/calibre/gui2/metadata/pdf_covers.py
index b81b628c6d..ca1c964640 100644
--- a/src/calibre/gui2/metadata/pdf_covers.py
+++ b/src/calibre/gui2/metadata/pdf_covers.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/metadata/single.py b/src/calibre/gui2/metadata/single.py
index 8c8f927dde..f3de859ef9 100644
--- a/src/calibre/gui2/metadata/single.py
+++ b/src/calibre/gui2/metadata/single.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/metadata/single_download.py b/src/calibre/gui2/metadata/single_download.py
index 9961cd3e02..d5ac5cc3a2 100644
--- a/src/calibre/gui2/metadata/single_download.py
+++ b/src/calibre/gui2/metadata/single_download.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/notify.py b/src/calibre/gui2/notify.py
index ac0421981f..84653b1940 100644
--- a/src/calibre/gui2/notify.py
+++ b/src/calibre/gui2/notify.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/open_with.py b/src/calibre/gui2/open_with.py
index 59af75ada8..66388a1f50 100644
--- a/src/calibre/gui2/open_with.py
+++ b/src/calibre/gui2/open_with.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/pin_columns.py b/src/calibre/gui2/pin_columns.py
index 1a0196ae45..33e11d599e 100644
--- a/src/calibre/gui2/pin_columns.py
+++ b/src/calibre/gui2/pin_columns.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import QSplitter, QTableView
 
diff --git a/src/calibre/gui2/preferences/__init__.py b/src/calibre/gui2/preferences/__init__.py
index 068fa5dd51..60d5f13f3a 100644
--- a/src/calibre/gui2/preferences/__init__.py
+++ b/src/calibre/gui2/preferences/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/adding.py b/src/calibre/gui2/preferences/adding.py
index 763c90ba8d..cf57c8e4ce 100644
--- a/src/calibre/gui2/preferences/adding.py
+++ b/src/calibre/gui2/preferences/adding.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/behavior.py b/src/calibre/gui2/preferences/behavior.py
index 20ccb44803..d5c4ab8779 100644
--- a/src/calibre/gui2/preferences/behavior.py
+++ b/src/calibre/gui2/preferences/behavior.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/coloring.py b/src/calibre/gui2/preferences/coloring.py
index 175a23bf1d..4957c7a580 100644
--- a/src/calibre/gui2/preferences/coloring.py
+++ b/src/calibre/gui2/preferences/coloring.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/columns.py b/src/calibre/gui2/preferences/columns.py
index dc32c01d6a..8fdefa6cd5 100644
--- a/src/calibre/gui2/preferences/columns.py
+++ b/src/calibre/gui2/preferences/columns.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/conversion.py b/src/calibre/gui2/preferences/conversion.py
index b8236ed252..1a41bb6086 100644
--- a/src/calibre/gui2/preferences/conversion.py
+++ b/src/calibre/gui2/preferences/conversion.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/create_custom_column.py b/src/calibre/gui2/preferences/create_custom_column.py
index f1cbcf61a0..1310933a92 100644
--- a/src/calibre/gui2/preferences/create_custom_column.py
+++ b/src/calibre/gui2/preferences/create_custom_column.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/device_debug.py b/src/calibre/gui2/preferences/device_debug.py
index b7ea85b566..7d48941ddf 100644
--- a/src/calibre/gui2/preferences/device_debug.py
+++ b/src/calibre/gui2/preferences/device_debug.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/device_user_defined.py b/src/calibre/gui2/preferences/device_user_defined.py
index acc7e5c08b..94ea58a70d 100644
--- a/src/calibre/gui2/preferences/device_user_defined.py
+++ b/src/calibre/gui2/preferences/device_user_defined.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/emailp.py b/src/calibre/gui2/preferences/emailp.py
index ef0a6d3e72..c38e884025 100644
--- a/src/calibre/gui2/preferences/emailp.py
+++ b/src/calibre/gui2/preferences/emailp.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 import re
diff --git a/src/calibre/gui2/preferences/history.py b/src/calibre/gui2/preferences/history.py
index a27df1e324..63bd638e71 100644
--- a/src/calibre/gui2/preferences/history.py
+++ b/src/calibre/gui2/preferences/history.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/ignored_devices.py b/src/calibre/gui2/preferences/ignored_devices.py
index dcee3b3822..40dd646da7 100644
--- a/src/calibre/gui2/preferences/ignored_devices.py
+++ b/src/calibre/gui2/preferences/ignored_devices.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
 # License: GPLv3 Copyright: 2012, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import textwrap
 
diff --git a/src/calibre/gui2/preferences/keyboard.py b/src/calibre/gui2/preferences/keyboard.py
index 1846a012d6..457edb3aca 100644
--- a/src/calibre/gui2/preferences/keyboard.py
+++ b/src/calibre/gui2/preferences/keyboard.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/look_feel.py b/src/calibre/gui2/preferences/look_feel.py
index c3cff466e6..141b20dc4d 100644
--- a/src/calibre/gui2/preferences/look_feel.py
+++ b/src/calibre/gui2/preferences/look_feel.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/main.py b/src/calibre/gui2/preferences/main.py
index 62acb94322..a07a30461c 100644
--- a/src/calibre/gui2/preferences/main.py
+++ b/src/calibre/gui2/preferences/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/metadata_sources.py b/src/calibre/gui2/preferences/metadata_sources.py
index e118d18f68..97855eab14 100644
--- a/src/calibre/gui2/preferences/metadata_sources.py
+++ b/src/calibre/gui2/preferences/metadata_sources.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/misc.py b/src/calibre/gui2/preferences/misc.py
index 592fc29b29..d5581e8be3 100644
--- a/src/calibre/gui2/preferences/misc.py
+++ b/src/calibre/gui2/preferences/misc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/plugboard.py b/src/calibre/gui2/preferences/plugboard.py
index a68f9e9092..877964878f 100644
--- a/src/calibre/gui2/preferences/plugboard.py
+++ b/src/calibre/gui2/preferences/plugboard.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/plugins.py b/src/calibre/gui2/preferences/plugins.py
index 07845dfcc7..060bb12192 100644
--- a/src/calibre/gui2/preferences/plugins.py
+++ b/src/calibre/gui2/preferences/plugins.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/save_template.py b/src/calibre/gui2/preferences/save_template.py
index ab6a2465aa..94d5a568cb 100644
--- a/src/calibre/gui2/preferences/save_template.py
+++ b/src/calibre/gui2/preferences/save_template.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/saving.py b/src/calibre/gui2/preferences/saving.py
index 57cbceee56..79dda54497 100644
--- a/src/calibre/gui2/preferences/saving.py
+++ b/src/calibre/gui2/preferences/saving.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/search.py b/src/calibre/gui2/preferences/search.py
index ece060fb9b..0b4b7b6f29 100644
--- a/src/calibre/gui2/preferences/search.py
+++ b/src/calibre/gui2/preferences/search.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/sending.py b/src/calibre/gui2/preferences/sending.py
index 1501f0a80b..d25b620251 100644
--- a/src/calibre/gui2/preferences/sending.py
+++ b/src/calibre/gui2/preferences/sending.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/server.py b/src/calibre/gui2/preferences/server.py
index 48d6fc77c0..0bf4318ed5 100644
--- a/src/calibre/gui2/preferences/server.py
+++ b/src/calibre/gui2/preferences/server.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import json
diff --git a/src/calibre/gui2/preferences/template_functions.py b/src/calibre/gui2/preferences/template_functions.py
index 79bc815c2c..f1ade855af 100644
--- a/src/calibre/gui2/preferences/template_functions.py
+++ b/src/calibre/gui2/preferences/template_functions.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/texture_chooser.py b/src/calibre/gui2/preferences/texture_chooser.py
index 15d8e22af8..b61f68031a 100644
--- a/src/calibre/gui2/preferences/texture_chooser.py
+++ b/src/calibre/gui2/preferences/texture_chooser.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/toolbar.py b/src/calibre/gui2/preferences/toolbar.py
index c5df6a3d0b..8999f2340a 100644
--- a/src/calibre/gui2/preferences/toolbar.py
+++ b/src/calibre/gui2/preferences/toolbar.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/preferences/tweaks.py b/src/calibre/gui2/preferences/tweaks.py
index 5531ef9e9e..7ac430b014 100644
--- a/src/calibre/gui2/preferences/tweaks.py
+++ b/src/calibre/gui2/preferences/tweaks.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 import textwrap
diff --git a/src/calibre/gui2/proceed.py b/src/calibre/gui2/proceed.py
index f182298aec..9e6e585eeb 100644
--- a/src/calibre/gui2/proceed.py
+++ b/src/calibre/gui2/proceed.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/progress_indicator/__init__.py b/src/calibre/gui2/progress_indicator/__init__.py
index 1c2866ef87..6d9fc45e9d 100644
--- a/src/calibre/gui2/progress_indicator/__init__.py
+++ b/src/calibre/gui2/progress_indicator/__init__.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import (
     QDialog, QLabel, QSizePolicy, QStackedLayout, QStackedWidget, Qt, QVBoxLayout,
diff --git a/src/calibre/gui2/qt_file_dialogs.py b/src/calibre/gui2/qt_file_dialogs.py
index 7f2d66b3d6..635e3631c5 100644
--- a/src/calibre/gui2/qt_file_dialogs.py
+++ b/src/calibre/gui2/qt_file_dialogs.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 
diff --git a/src/calibre/gui2/save.py b/src/calibre/gui2/save.py
index 5b89270979..92913a6896 100644
--- a/src/calibre/gui2/save.py
+++ b/src/calibre/gui2/save.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/search_box.py b/src/calibre/gui2/search_box.py
index e12c383e8e..0a1f5aa261 100644
--- a/src/calibre/gui2/search_box.py
+++ b/src/calibre/gui2/search_box.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/search_restriction_mixin.py b/src/calibre/gui2/search_restriction_mixin.py
index 96572e75b1..fb6f564bbb 100644
--- a/src/calibre/gui2/search_restriction_mixin.py
+++ b/src/calibre/gui2/search_restriction_mixin.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/shortcuts.py b/src/calibre/gui2/shortcuts.py
index f81093bcc0..5fd667c6dc 100644
--- a/src/calibre/gui2/shortcuts.py
+++ b/src/calibre/gui2/shortcuts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/splash_screen.py b/src/calibre/gui2/splash_screen.py
index 1af52acf9d..580565c6eb 100644
--- a/src/calibre/gui2/splash_screen.py
+++ b/src/calibre/gui2/splash_screen.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import (
     QApplication, QBrush, QColor, QFont, QFontMetrics, QPen, QPixmap, QSplashScreen,
diff --git a/src/calibre/gui2/store/__init__.py b/src/calibre/gui2/store/__init__.py
index 7e4e923651..61facb0f18 100644
--- a/src/calibre/gui2/store/__init__.py
+++ b/src/calibre/gui2/store/__init__.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/basic_config.py b/src/calibre/gui2/store/basic_config.py
index 33d91e5d70..089380c7ba 100644
--- a/src/calibre/gui2/store/basic_config.py
+++ b/src/calibre/gui2/store/basic_config.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/config/chooser/adv_search_builder.py b/src/calibre/gui2/store/config/chooser/adv_search_builder.py
index 3592023fdd..575f40b280 100644
--- a/src/calibre/gui2/store/config/chooser/adv_search_builder.py
+++ b/src/calibre/gui2/store/config/chooser/adv_search_builder.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/config/chooser/chooser_dialog.py b/src/calibre/gui2/store/config/chooser/chooser_dialog.py
index 6a6fee5dff..502f70ec70 100644
--- a/src/calibre/gui2/store/config/chooser/chooser_dialog.py
+++ b/src/calibre/gui2/store/config/chooser/chooser_dialog.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/config/chooser/chooser_widget.py b/src/calibre/gui2/store/config/chooser/chooser_widget.py
index 22be225be3..3ad9c64c14 100644
--- a/src/calibre/gui2/store/config/chooser/chooser_widget.py
+++ b/src/calibre/gui2/store/config/chooser/chooser_widget.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/config/chooser/models.py b/src/calibre/gui2/store/config/chooser/models.py
index f1a3dd47c8..73dd26cc51 100644
--- a/src/calibre/gui2/store/config/chooser/models.py
+++ b/src/calibre/gui2/store/config/chooser/models.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/config/chooser/results_view.py b/src/calibre/gui2/store/config/chooser/results_view.py
index 208d23e64d..991529f022 100644
--- a/src/calibre/gui2/store/config/chooser/results_view.py
+++ b/src/calibre/gui2/store/config/chooser/results_view.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/config/search/search_widget.py b/src/calibre/gui2/store/config/search/search_widget.py
index 435d5bdfc0..ec2e29a288 100644
--- a/src/calibre/gui2/store/config/search/search_widget.py
+++ b/src/calibre/gui2/store/config/search/search_widget.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/config/store.py b/src/calibre/gui2/store/config/store.py
index a54ba1345a..de0fbff74c 100644
--- a/src/calibre/gui2/store/config/store.py
+++ b/src/calibre/gui2/store/config/store.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/loader.py b/src/calibre/gui2/store/loader.py
index 6effe76382..a8dd3f147b 100644
--- a/src/calibre/gui2/store/loader.py
+++ b/src/calibre/gui2/store/loader.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/store/opensearch_store.py b/src/calibre/gui2/store/opensearch_store.py
index d51e36514e..745607776a 100644
--- a/src/calibre/gui2/store/opensearch_store.py
+++ b/src/calibre/gui2/store/opensearch_store.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/search/adv_search_builder.py b/src/calibre/gui2/store/search/adv_search_builder.py
index 04b999a91c..7c5c7e9a43 100644
--- a/src/calibre/gui2/store/search/adv_search_builder.py
+++ b/src/calibre/gui2/store/search/adv_search_builder.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/search/download_thread.py b/src/calibre/gui2/store/search/download_thread.py
index 5ffe0d21f5..075a29c57d 100644
--- a/src/calibre/gui2/store/search/download_thread.py
+++ b/src/calibre/gui2/store/search/download_thread.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/search/models.py b/src/calibre/gui2/store/search/models.py
index ea41016248..e03b21cef7 100644
--- a/src/calibre/gui2/store/search/models.py
+++ b/src/calibre/gui2/store/search/models.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/search/results_view.py b/src/calibre/gui2/store/search/results_view.py
index f32587b965..514c4f3c86 100644
--- a/src/calibre/gui2/store/search/results_view.py
+++ b/src/calibre/gui2/store/search/results_view.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/search/search.py b/src/calibre/gui2/store/search/search.py
index 09eb34c472..4be78798f3 100644
--- a/src/calibre/gui2/store/search/search.py
+++ b/src/calibre/gui2/store/search/search.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/search_result.py b/src/calibre/gui2/store/search_result.py
index 32d4c9f1d8..c050e8605c 100644
--- a/src/calibre/gui2/store/search_result.py
+++ b/src/calibre/gui2/store/search_result.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/gui2/store/web_store.py b/src/calibre/gui2/store/web_store.py
index 45043e1b36..9524615fc6 100644
--- a/src/calibre/gui2/store/web_store.py
+++ b/src/calibre/gui2/store/web_store.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import os
diff --git a/src/calibre/gui2/store/web_store_dialog.py b/src/calibre/gui2/store/web_store_dialog.py
index 23d01e42f6..3f8f17ea8f 100644
--- a/src/calibre/gui2/store/web_store_dialog.py
+++ b/src/calibre/gui2/store/web_store_dialog.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 from base64 import standard_b64encode
diff --git a/src/calibre/gui2/tag_browser/__init__.py b/src/calibre/gui2/tag_browser/__init__.py
index ec9ca8ff95..219dc1f99c 100644
--- a/src/calibre/gui2/tag_browser/__init__.py
+++ b/src/calibre/gui2/tag_browser/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/tag_browser/model.py b/src/calibre/gui2/tag_browser/model.py
index 0e446de644..4abb2f0c0a 100644
--- a/src/calibre/gui2/tag_browser/model.py
+++ b/src/calibre/gui2/tag_browser/model.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/tag_browser/ui.py b/src/calibre/gui2/tag_browser/ui.py
index 2b4443fa95..1c100e1316 100644
--- a/src/calibre/gui2/tag_browser/ui.py
+++ b/src/calibre/gui2/tag_browser/ui.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/tag_browser/view.py b/src/calibre/gui2/tag_browser/view.py
index 09a66d9504..a35131aa16 100644
--- a/src/calibre/gui2/tag_browser/view.py
+++ b/src/calibre/gui2/tag_browser/view.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/tag_mapper.py b/src/calibre/gui2/tag_mapper.py
index 4005c9bba8..12c84d4011 100644
--- a/src/calibre/gui2/tag_mapper.py
+++ b/src/calibre/gui2/tag_mapper.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import OrderedDict
 import textwrap
diff --git a/src/calibre/gui2/threaded_jobs.py b/src/calibre/gui2/threaded_jobs.py
index 035eae4f13..70006d19b4 100644
--- a/src/calibre/gui2/threaded_jobs.py
+++ b/src/calibre/gui2/threaded_jobs.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/throbber.py b/src/calibre/gui2/throbber.py
index 888afa46be..6ab4cedda0 100644
--- a/src/calibre/gui2/throbber.py
+++ b/src/calibre/gui2/throbber.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/toc/__init__.py b/src/calibre/gui2/toc/__init__.py
index d26359eab9..409db9d8ca 100644
--- a/src/calibre/gui2/toc/__init__.py
+++ b/src/calibre/gui2/toc/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/toc/location.py b/src/calibre/gui2/toc/location.py
index ab283fcf41..0fec94b75b 100644
--- a/src/calibre/gui2/toc/location.py
+++ b/src/calibre/gui2/toc/location.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 
diff --git a/src/calibre/gui2/toc/main.py b/src/calibre/gui2/toc/main.py
index 61e9b32182..f9bf0e73f3 100644
--- a/src/calibre/gui2/toc/main.py
+++ b/src/calibre/gui2/toc/main.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import sys
diff --git a/src/calibre/gui2/tools.py b/src/calibre/gui2/tools.py
index e26f457d45..d2a49e1a51 100644
--- a/src/calibre/gui2/tools.py
+++ b/src/calibre/gui2/tools.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/gui2/tweak_book/__init__.py b/src/calibre/gui2/tweak_book/__init__.py
index 4be9703b36..0a817a2273 100644
--- a/src/calibre/gui2/tweak_book/__init__.py
+++ b/src/calibre/gui2/tweak_book/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/boss.py b/src/calibre/gui2/tweak_book/boss.py
index 9c1e3eee2e..d0464b4601 100644
--- a/src/calibre/gui2/tweak_book/boss.py
+++ b/src/calibre/gui2/tweak_book/boss.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import os
diff --git a/src/calibre/gui2/tweak_book/char_select.py b/src/calibre/gui2/tweak_book/char_select.py
index ea99570dfb..16971ed54a 100644
--- a/src/calibre/gui2/tweak_book/char_select.py
+++ b/src/calibre/gui2/tweak_book/char_select.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/check.py b/src/calibre/gui2/tweak_book/check.py
index 2d5510551b..b350a6c0e2 100644
--- a/src/calibre/gui2/tweak_book/check.py
+++ b/src/calibre/gui2/tweak_book/check.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/check_links.py b/src/calibre/gui2/tweak_book/check_links.py
index 22d8ff0ebd..750c4eacac 100644
--- a/src/calibre/gui2/tweak_book/check_links.py
+++ b/src/calibre/gui2/tweak_book/check_links.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import defaultdict
 from threading import Thread
diff --git a/src/calibre/gui2/tweak_book/completion/basic.py b/src/calibre/gui2/tweak_book/completion/basic.py
index 9c18ff7689..766629a1d9 100644
--- a/src/calibre/gui2/tweak_book/completion/basic.py
+++ b/src/calibre/gui2/tweak_book/completion/basic.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/completion/popup.py b/src/calibre/gui2/tweak_book/completion/popup.py
index 502df11daa..b9cdcacb46 100644
--- a/src/calibre/gui2/tweak_book/completion/popup.py
+++ b/src/calibre/gui2/tweak_book/completion/popup.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/completion/utils.py b/src/calibre/gui2/tweak_book/completion/utils.py
index 51ffe1c20a..6270a5a6a5 100644
--- a/src/calibre/gui2/tweak_book/completion/utils.py
+++ b/src/calibre/gui2/tweak_book/completion/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import unicode_type
 
diff --git a/src/calibre/gui2/tweak_book/completion/worker.py b/src/calibre/gui2/tweak_book/completion/worker.py
index a79b5c96db..12a5c45ace 100644
--- a/src/calibre/gui2/tweak_book/completion/worker.py
+++ b/src/calibre/gui2/tweak_book/completion/worker.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/diff/__init__.py b/src/calibre/gui2/tweak_book/diff/__init__.py
index e8ff181102..1d7ee75f5b 100644
--- a/src/calibre/gui2/tweak_book/diff/__init__.py
+++ b/src/calibre/gui2/tweak_book/diff/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/diff/highlight.py b/src/calibre/gui2/tweak_book/diff/highlight.py
index 6fea7f21b5..c533a3869e 100644
--- a/src/calibre/gui2/tweak_book/diff/highlight.py
+++ b/src/calibre/gui2/tweak_book/diff/highlight.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/diff/main.py b/src/calibre/gui2/tweak_book/diff/main.py
index f952170f5a..6d57d8187c 100644
--- a/src/calibre/gui2/tweak_book/diff/main.py
+++ b/src/calibre/gui2/tweak_book/diff/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/diff/view.py b/src/calibre/gui2/tweak_book/diff/view.py
index d6a58ba93a..cceb92860b 100644
--- a/src/calibre/gui2/tweak_book/diff/view.py
+++ b/src/calibre/gui2/tweak_book/diff/view.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/download.py b/src/calibre/gui2/tweak_book/download.py
index d4c7c094ed..90794c0b5c 100644
--- a/src/calibre/gui2/tweak_book/download.py
+++ b/src/calibre/gui2/tweak_book/download.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from threading import Thread
 
 from PyQt5.Qt import (
diff --git a/src/calibre/gui2/tweak_book/editor/__init__.py b/src/calibre/gui2/tweak_book/editor/__init__.py
index 3b850caf95..0c11c32fdb 100644
--- a/src/calibre/gui2/tweak_book/editor/__init__.py
+++ b/src/calibre/gui2/tweak_book/editor/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/canvas.py b/src/calibre/gui2/tweak_book/editor/canvas.py
index 0b7b3b2c42..c033e9e41e 100644
--- a/src/calibre/gui2/tweak_book/editor/canvas.py
+++ b/src/calibre/gui2/tweak_book/editor/canvas.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/comments.py b/src/calibre/gui2/tweak_book/editor/comments.py
index 76a3f7207c..985ecf1faa 100644
--- a/src/calibre/gui2/tweak_book/editor/comments.py
+++ b/src/calibre/gui2/tweak_book/editor/comments.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import QTextCursor
 
diff --git a/src/calibre/gui2/tweak_book/editor/help.py b/src/calibre/gui2/tweak_book/editor/help.py
index fca7cbe905..4245dbc7b4 100644
--- a/src/calibre/gui2/tweak_book/editor/help.py
+++ b/src/calibre/gui2/tweak_book/editor/help.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/image.py b/src/calibre/gui2/tweak_book/editor/image.py
index ec00f7fac5..6a9eb15ff3 100644
--- a/src/calibre/gui2/tweak_book/editor/image.py
+++ b/src/calibre/gui2/tweak_book/editor/image.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/insert_resource.py b/src/calibre/gui2/tweak_book/editor/insert_resource.py
index 44d44e4b3c..5ab6ad9609 100644
--- a/src/calibre/gui2/tweak_book/editor/insert_resource.py
+++ b/src/calibre/gui2/tweak_book/editor/insert_resource.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/smarts/__init__.py b/src/calibre/gui2/tweak_book/editor/smarts/__init__.py
index 186097ae7d..8774aab529 100644
--- a/src/calibre/gui2/tweak_book/editor/smarts/__init__.py
+++ b/src/calibre/gui2/tweak_book/editor/smarts/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/smarts/css.py b/src/calibre/gui2/tweak_book/editor/smarts/css.py
index e47804a0e4..bc1a19be74 100644
--- a/src/calibre/gui2/tweak_book/editor/smarts/css.py
+++ b/src/calibre/gui2/tweak_book/editor/smarts/css.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/smarts/html.py b/src/calibre/gui2/tweak_book/editor/smarts/html.py
index 7196e90c06..cf267b3af8 100644
--- a/src/calibre/gui2/tweak_book/editor/smarts/html.py
+++ b/src/calibre/gui2/tweak_book/editor/smarts/html.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/smarts/python.py b/src/calibre/gui2/tweak_book/editor/smarts/python.py
index 4167171457..2c46a4c677 100644
--- a/src/calibre/gui2/tweak_book/editor/smarts/python.py
+++ b/src/calibre/gui2/tweak_book/editor/smarts/python.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/smarts/utils.py b/src/calibre/gui2/tweak_book/editor/smarts/utils.py
index 53ce86092c..633995c989 100644
--- a/src/calibre/gui2/tweak_book/editor/smarts/utils.py
+++ b/src/calibre/gui2/tweak_book/editor/smarts/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/snippets.py b/src/calibre/gui2/tweak_book/editor/snippets.py
index 732640f682..50a735f2af 100644
--- a/src/calibre/gui2/tweak_book/editor/snippets.py
+++ b/src/calibre/gui2/tweak_book/editor/snippets.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/__init__.py b/src/calibre/gui2/tweak_book/editor/syntax/__init__.py
index 69376f9ebd..e4102b4b10 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/__init__.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/base.py b/src/calibre/gui2/tweak_book/editor/syntax/base.py
index 0e2f4031be..f8a73953b6 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/base.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/base.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/css.py b/src/calibre/gui2/tweak_book/editor/syntax/css.py
index 0634c8e875..80b40d1e09 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/css.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/css.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/html.py b/src/calibre/gui2/tweak_book/editor/syntax/html.py
index a3d5d157e9..d52a220fde 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/html.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/html.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/javascript.py b/src/calibre/gui2/tweak_book/editor/syntax/javascript.py
index 83a0af6f67..0581678825 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/javascript.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/javascript.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/pygments_highlighter.py b/src/calibre/gui2/tweak_book/editor/syntax/pygments_highlighter.py
index 2b88d6984a..64f7385ad0 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/pygments_highlighter.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/pygments_highlighter.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/python.py b/src/calibre/gui2/tweak_book/editor/syntax/python.py
index 929f07a66d..e81c58046e 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/python.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/python.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/utils.py b/src/calibre/gui2/tweak_book/editor/syntax/utils.py
index 9604a044c8..7a18ebee7a 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/utils.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/syntax/xml.py b/src/calibre/gui2/tweak_book/editor/syntax/xml.py
index 4b275e645b..e503f3538b 100644
--- a/src/calibre/gui2/tweak_book/editor/syntax/xml.py
+++ b/src/calibre/gui2/tweak_book/editor/syntax/xml.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/text.py b/src/calibre/gui2/tweak_book/editor/text.py
index 9b5bd84480..c30b55fd3c 100644
--- a/src/calibre/gui2/tweak_book/editor/text.py
+++ b/src/calibre/gui2/tweak_book/editor/text.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import importlib
 import os
diff --git a/src/calibre/gui2/tweak_book/editor/themes.py b/src/calibre/gui2/tweak_book/editor/themes.py
index 37a9c9e44a..37da479b1a 100644
--- a/src/calibre/gui2/tweak_book/editor/themes.py
+++ b/src/calibre/gui2/tweak_book/editor/themes.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/editor/widget.py b/src/calibre/gui2/tweak_book/editor/widget.py
index 1706b17284..18f697c0ee 100644
--- a/src/calibre/gui2/tweak_book/editor/widget.py
+++ b/src/calibre/gui2/tweak_book/editor/widget.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/file_list.py b/src/calibre/gui2/tweak_book/file_list.py
index 8a036373ed..4340cb1b9e 100644
--- a/src/calibre/gui2/tweak_book/file_list.py
+++ b/src/calibre/gui2/tweak_book/file_list.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import posixpath
diff --git a/src/calibre/gui2/tweak_book/function_replace.py b/src/calibre/gui2/tweak_book/function_replace.py
index e39bc1ef31..527ad776f3 100644
--- a/src/calibre/gui2/tweak_book/function_replace.py
+++ b/src/calibre/gui2/tweak_book/function_replace.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/job.py b/src/calibre/gui2/tweak_book/job.py
index 8d0f98322a..884a06ff48 100644
--- a/src/calibre/gui2/tweak_book/job.py
+++ b/src/calibre/gui2/tweak_book/job.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/live_css.py b/src/calibre/gui2/tweak_book/live_css.py
index 501fe7f5dc..4c35761b29 100644
--- a/src/calibre/gui2/tweak_book/live_css.py
+++ b/src/calibre/gui2/tweak_book/live_css.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/main.py b/src/calibre/gui2/tweak_book/main.py
index 80d7ad5724..505498be84 100644
--- a/src/calibre/gui2/tweak_book/main.py
+++ b/src/calibre/gui2/tweak_book/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import importlib
 import os
diff --git a/src/calibre/gui2/tweak_book/manage_fonts.py b/src/calibre/gui2/tweak_book/manage_fonts.py
index a7bc241a93..83306f0e46 100644
--- a/src/calibre/gui2/tweak_book/manage_fonts.py
+++ b/src/calibre/gui2/tweak_book/manage_fonts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/plugin.py b/src/calibre/gui2/tweak_book/plugin.py
index 2729b6f4a8..18b17fa88f 100644
--- a/src/calibre/gui2/tweak_book/plugin.py
+++ b/src/calibre/gui2/tweak_book/plugin.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/polish.py b/src/calibre/gui2/tweak_book/polish.py
index 022959e176..a72263fb4f 100644
--- a/src/calibre/gui2/tweak_book/polish.py
+++ b/src/calibre/gui2/tweak_book/polish.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/preferences.py b/src/calibre/gui2/tweak_book/preferences.py
index d0ea175009..0d46b93131 100644
--- a/src/calibre/gui2/tweak_book/preferences.py
+++ b/src/calibre/gui2/tweak_book/preferences.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/preview.py b/src/calibre/gui2/tweak_book/preview.py
index e18d2846a7..abcce059ca 100644
--- a/src/calibre/gui2/tweak_book/preview.py
+++ b/src/calibre/gui2/tweak_book/preview.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import textwrap
diff --git a/src/calibre/gui2/tweak_book/reports.py b/src/calibre/gui2/tweak_book/reports.py
index 011998de0c..9575ca2b0a 100644
--- a/src/calibre/gui2/tweak_book/reports.py
+++ b/src/calibre/gui2/tweak_book/reports.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/save.py b/src/calibre/gui2/tweak_book/save.py
index 8fd5b49eec..064e0d2fd9 100644
--- a/src/calibre/gui2/tweak_book/save.py
+++ b/src/calibre/gui2/tweak_book/save.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/search.py b/src/calibre/gui2/tweak_book/search.py
index 5e348e3999..e10c66546e 100644
--- a/src/calibre/gui2/tweak_book/search.py
+++ b/src/calibre/gui2/tweak_book/search.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import copy
 import json
diff --git a/src/calibre/gui2/tweak_book/spell.py b/src/calibre/gui2/tweak_book/spell.py
index 2f73364879..a200f6649d 100644
--- a/src/calibre/gui2/tweak_book/spell.py
+++ b/src/calibre/gui2/tweak_book/spell.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/templates.py b/src/calibre/gui2/tweak_book/templates.py
index 2e17801d90..01eb56f1a0 100644
--- a/src/calibre/gui2/tweak_book/templates.py
+++ b/src/calibre/gui2/tweak_book/templates.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/text_search.py b/src/calibre/gui2/tweak_book/text_search.py
index f8120ca121..93eb3fd294 100644
--- a/src/calibre/gui2/tweak_book/text_search.py
+++ b/src/calibre/gui2/tweak_book/text_search.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import (
     QWidget, QHBoxLayout, QVBoxLayout, QLabel, QComboBox, QPushButton, QIcon,
diff --git a/src/calibre/gui2/tweak_book/toc.py b/src/calibre/gui2/tweak_book/toc.py
index 893db597f4..7809bf153d 100644
--- a/src/calibre/gui2/tweak_book/toc.py
+++ b/src/calibre/gui2/tweak_book/toc.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/ui.py b/src/calibre/gui2/tweak_book/ui.py
index a42b6213e8..7155c2841d 100644
--- a/src/calibre/gui2/tweak_book/ui.py
+++ b/src/calibre/gui2/tweak_book/ui.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/undo.py b/src/calibre/gui2/tweak_book/undo.py
index 8d09118200..be77d80ad0 100644
--- a/src/calibre/gui2/tweak_book/undo.py
+++ b/src/calibre/gui2/tweak_book/undo.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/tweak_book/widgets.py b/src/calibre/gui2/tweak_book/widgets.py
index b10e3dbe0a..2b38c13257 100644
--- a/src/calibre/gui2/tweak_book/widgets.py
+++ b/src/calibre/gui2/tweak_book/widgets.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/ui.py b/src/calibre/gui2/ui.py
index f03e828b15..383d9a9a74 100644
--- a/src/calibre/gui2/ui.py
+++ b/src/calibre/gui2/ui.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/update.py b/src/calibre/gui2/update.py
index 1c3aa90ebf..9576b6443b 100644
--- a/src/calibre/gui2/update.py
+++ b/src/calibre/gui2/update.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/viewer/__init__.py b/src/calibre/gui2/viewer/__init__.py
index 2ca91bd118..635349d71f 100644
--- a/src/calibre/gui2/viewer/__init__.py
+++ b/src/calibre/gui2/viewer/__init__.py
@@ -2,4 +2,4 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
diff --git a/src/calibre/gui2/viewer/annotations.py b/src/calibre/gui2/viewer/annotations.py
index 57f41b6328..f46819a5c0 100644
--- a/src/calibre/gui2/viewer/annotations.py
+++ b/src/calibre/gui2/viewer/annotations.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import defaultdict
 from io import BytesIO
diff --git a/src/calibre/gui2/viewer/bookmarks.py b/src/calibre/gui2/viewer/bookmarks.py
index d4b297a070..b5187362e4 100644
--- a/src/calibre/gui2/viewer/bookmarks.py
+++ b/src/calibre/gui2/viewer/bookmarks.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 
diff --git a/src/calibre/gui2/viewer/convert_book.py b/src/calibre/gui2/viewer/convert_book.py
index fd0647b470..7c043908cf 100644
--- a/src/calibre/gui2/viewer/convert_book.py
+++ b/src/calibre/gui2/viewer/convert_book.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import json
diff --git a/src/calibre/gui2/viewer/lookup.py b/src/calibre/gui2/viewer/lookup.py
index 3a55d92f51..2c614b9480 100644
--- a/src/calibre/gui2/viewer/lookup.py
+++ b/src/calibre/gui2/viewer/lookup.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import sys
diff --git a/src/calibre/gui2/viewer/main.py b/src/calibre/gui2/viewer/main.py
index 34cb71b6d3..745c698907 100644
--- a/src/calibre/gui2/viewer/main.py
+++ b/src/calibre/gui2/viewer/main.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import sys
diff --git a/src/calibre/gui2/viewer/overlay.py b/src/calibre/gui2/viewer/overlay.py
index d21fff6ed1..9b6e105507 100644
--- a/src/calibre/gui2/viewer/overlay.py
+++ b/src/calibre/gui2/viewer/overlay.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import QWidget, Qt, QFontInfo, QLabel, QVBoxLayout
 
diff --git a/src/calibre/gui2/viewer/printing.py b/src/calibre/gui2/viewer/printing.py
index c54969b9ee..379ba86267 100644
--- a/src/calibre/gui2/viewer/printing.py
+++ b/src/calibre/gui2/viewer/printing.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import subprocess
diff --git a/src/calibre/gui2/viewer/shortcuts.py b/src/calibre/gui2/viewer/shortcuts.py
index 610da5e0e9..c05a1acb20 100644
--- a/src/calibre/gui2/viewer/shortcuts.py
+++ b/src/calibre/gui2/viewer/shortcuts.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from PyQt5.Qt import QKeySequence, QMainWindow, Qt
 
diff --git a/src/calibre/gui2/viewer/toc.py b/src/calibre/gui2/viewer/toc.py
index 23da1c2557..fe5a190c36 100644
--- a/src/calibre/gui2/viewer/toc.py
+++ b/src/calibre/gui2/viewer/toc.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re
 from functools import partial
diff --git a/src/calibre/gui2/viewer/toolbars.py b/src/calibre/gui2/viewer/toolbars.py
index 9ea6e61e5e..d5633805fb 100644
--- a/src/calibre/gui2/viewer/toolbars.py
+++ b/src/calibre/gui2/viewer/toolbars.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 from functools import partial
diff --git a/src/calibre/gui2/viewer/ui.py b/src/calibre/gui2/viewer/ui.py
index 3b033c7668..f3b3ec8db9 100644
--- a/src/calibre/gui2/viewer/ui.py
+++ b/src/calibre/gui2/viewer/ui.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import os
diff --git a/src/calibre/gui2/viewer/web_view.py b/src/calibre/gui2/viewer/web_view.py
index 3c5b744d21..ff029d8a0a 100644
--- a/src/calibre/gui2/viewer/web_view.py
+++ b/src/calibre/gui2/viewer/web_view.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import shutil
diff --git a/src/calibre/gui2/webengine.py b/src/calibre/gui2/webengine.py
index 12beed8200..939ce93fb5 100644
--- a/src/calibre/gui2/webengine.py
+++ b/src/calibre/gui2/webengine.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 
diff --git a/src/calibre/gui2/widgets.py b/src/calibre/gui2/widgets.py
index 5ef65a5d1c..583b306b32 100644
--- a/src/calibre/gui2/widgets.py
+++ b/src/calibre/gui2/widgets.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/gui2/widgets2.py b/src/calibre/gui2/widgets2.py
index 726b6fb265..262e38af22 100644
--- a/src/calibre/gui2/widgets2.py
+++ b/src/calibre/gui2/widgets2.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import weakref
 
diff --git a/src/calibre/gui2/win_file_dialogs.py b/src/calibre/gui2/win_file_dialogs.py
index 9c6a3b0bdf..bf308a3824 100644
--- a/src/calibre/gui2/win_file_dialogs.py
+++ b/src/calibre/gui2/win_file_dialogs.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import struct
diff --git a/src/calibre/gui2/wizard/__init__.py b/src/calibre/gui2/wizard/__init__.py
index 13e03ae09d..dca9deb1a2 100644
--- a/src/calibre/gui2/wizard/__init__.py
+++ b/src/calibre/gui2/wizard/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui2/wizard/send_email.py b/src/calibre/gui2/wizard/send_email.py
index 6d31f6ba75..dd683ff001 100644
--- a/src/calibre/gui2/wizard/send_email.py
+++ b/src/calibre/gui2/wizard/send_email.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/gui_launch.py b/src/calibre/gui_launch.py
index a53a101475..320460ae3c 100644
--- a/src/calibre/gui_launch.py
+++ b/src/calibre/gui_launch.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/library/__init__.py b/src/calibre/library/__init__.py
index 655ca84169..c70078bd93 100644
--- a/src/calibre/library/__init__.py
+++ b/src/calibre/library/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/library/add_to_library.py b/src/calibre/library/add_to_library.py
index d5d307356e..3535042580 100644
--- a/src/calibre/library/add_to_library.py
+++ b/src/calibre/library/add_to_library.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/caches.py b/src/calibre/library/caches.py
index 9f50dd48e6..731bbea6bd 100644
--- a/src/calibre/library/caches.py
+++ b/src/calibre/library/caches.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/catalogs/__init__.py b/src/calibre/library/catalogs/__init__.py
index 1b05c647dc..c916618c05 100644
--- a/src/calibre/library/catalogs/__init__.py
+++ b/src/calibre/library/catalogs/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/catalogs/bibtex.py b/src/calibre/library/catalogs/bibtex.py
index d22390bbcc..cc3137e931 100644
--- a/src/calibre/library/catalogs/bibtex.py
+++ b/src/calibre/library/catalogs/bibtex.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/catalogs/csv_xml.py b/src/calibre/library/catalogs/csv_xml.py
index f573b39889..2e828e50e4 100644
--- a/src/calibre/library/catalogs/csv_xml.py
+++ b/src/calibre/library/catalogs/csv_xml.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/catalogs/epub_mobi.py b/src/calibre/library/catalogs/epub_mobi.py
index 5267a00dd9..91160ffd44 100644
--- a/src/calibre/library/catalogs/epub_mobi.py
+++ b/src/calibre/library/catalogs/epub_mobi.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/catalogs/epub_mobi_builder.py b/src/calibre/library/catalogs/epub_mobi_builder.py
index 6b2e7d47b7..494c786aa6 100644
--- a/src/calibre/library/catalogs/epub_mobi_builder.py
+++ b/src/calibre/library/catalogs/epub_mobi_builder.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2010, Greg Riker
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import datetime
 import os
diff --git a/src/calibre/library/catalogs/utils.py b/src/calibre/library/catalogs/utils.py
index cd7521fc19..a4cb12f576 100644
--- a/src/calibre/library/catalogs/utils.py
+++ b/src/calibre/library/catalogs/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Greg Riker'
diff --git a/src/calibre/library/check_library.py b/src/calibre/library/check_library.py
index 81ba156299..0757b98f5b 100644
--- a/src/calibre/library/check_library.py
+++ b/src/calibre/library/check_library.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/coloring.py b/src/calibre/library/coloring.py
index 51f2b79702..6f98352928 100644
--- a/src/calibre/library/coloring.py
+++ b/src/calibre/library/coloring.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2011, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import re
diff --git a/src/calibre/library/comments.py b/src/calibre/library/comments.py
index 0f20a52edf..1fefa181b2 100644
--- a/src/calibre/library/comments.py
+++ b/src/calibre/library/comments.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re
 
diff --git a/src/calibre/library/custom_columns.py b/src/calibre/library/custom_columns.py
index fcebc2c87a..14e5c6707e 100644
--- a/src/calibre/library/custom_columns.py
+++ b/src/calibre/library/custom_columns.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/database.py b/src/calibre/library/database.py
index 48b13667b1..2a8ea8ec68 100644
--- a/src/calibre/library/database.py
+++ b/src/calibre/library/database.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/library/database2.py b/src/calibre/library/database2.py
index 7afb407602..653f5f83c5 100644
--- a/src/calibre/library/database2.py
+++ b/src/calibre/library/database2.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/library/field_metadata.py b/src/calibre/library/field_metadata.py
index 5e385b9a9f..e6df9b48fa 100644
--- a/src/calibre/library/field_metadata.py
+++ b/src/calibre/library/field_metadata.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Created on 25 May 2010
diff --git a/src/calibre/library/prefs.py b/src/calibre/library/prefs.py
index 8807516013..9e1556eb98 100644
--- a/src/calibre/library/prefs.py
+++ b/src/calibre/library/prefs.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/restore.py b/src/calibre/library/restore.py
index 8d04e7e9eb..9648f94097 100644
--- a/src/calibre/library/restore.py
+++ b/src/calibre/library/restore.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/save_to_disk.py b/src/calibre/library/save_to_disk.py
index 72b6273eb6..7b370b67f8 100644
--- a/src/calibre/library/save_to_disk.py
+++ b/src/calibre/library/save_to_disk.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/schema_upgrades.py b/src/calibre/library/schema_upgrades.py
index f3535ce8b3..7685d3cdfa 100644
--- a/src/calibre/library/schema_upgrades.py
+++ b/src/calibre/library/schema_upgrades.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/library/sqlite.py b/src/calibre/library/sqlite.py
index b237b013ff..52004c4648 100644
--- a/src/calibre/library/sqlite.py
+++ b/src/calibre/library/sqlite.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/libunzip.py b/src/calibre/libunzip.py
index 6830545750..37e35f89ad 100644
--- a/src/calibre/libunzip.py
+++ b/src/calibre/libunzip.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/linux.py b/src/calibre/linux.py
index 994f707619..0e7d96692a 100644
--- a/src/calibre/linux.py
+++ b/src/calibre/linux.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 ''' Post installation script for linux '''
 
diff --git a/src/calibre/ptempfile.py b/src/calibre/ptempfile.py
index 9d9bf81d42..8f94eb8e81 100644
--- a/src/calibre/ptempfile.py
+++ b/src/calibre/ptempfile.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 """
diff --git a/src/calibre/rpdb.py b/src/calibre/rpdb.py
index d15fcc2d2e..5cc8fbe871 100644
--- a/src/calibre/rpdb.py
+++ b/src/calibre/rpdb.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/spell/__init__.py b/src/calibre/spell/__init__.py
index 68fe3c3eb2..5ebde414fd 100644
--- a/src/calibre/spell/__init__.py
+++ b/src/calibre/spell/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/spell/break_iterator.py b/src/calibre/spell/break_iterator.py
index 980e0a434f..581ba1d6df 100644
--- a/src/calibre/spell/break_iterator.py
+++ b/src/calibre/spell/break_iterator.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/spell/dictionary.py b/src/calibre/spell/dictionary.py
index e8db242ffc..52a23c03fe 100644
--- a/src/calibre/spell/dictionary.py
+++ b/src/calibre/spell/dictionary.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2014, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import glob
 import os
diff --git a/src/calibre/spell/import_from.py b/src/calibre/spell/import_from.py
index 35a1627316..c4e9e4f106 100644
--- a/src/calibre/spell/import_from.py
+++ b/src/calibre/spell/import_from.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/ajax.py b/src/calibre/srv/ajax.py
index a48c9619a2..74507f7f19 100644
--- a/src/calibre/srv/ajax.py
+++ b/src/calibre/srv/ajax.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/auth.py b/src/calibre/srv/auth.py
index b78bd51767..62428c1597 100644
--- a/src/calibre/srv/auth.py
+++ b/src/calibre/srv/auth.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/auto_reload.py b/src/calibre/srv/auto_reload.py
index fdfc2b077e..3001dfd573 100644
--- a/src/calibre/srv/auto_reload.py
+++ b/src/calibre/srv/auto_reload.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/bonjour.py b/src/calibre/srv/bonjour.py
index 05749c1665..7bac6ef7bf 100644
--- a/src/calibre/srv/bonjour.py
+++ b/src/calibre/srv/bonjour.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/books.py b/src/calibre/srv/books.py
index fa0b5b9c72..8fbeb36a84 100644
--- a/src/calibre/srv/books.py
+++ b/src/calibre/srv/books.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import json as jsonlib
diff --git a/src/calibre/srv/cdb.py b/src/calibre/srv/cdb.py
index 4e9e0efc05..c5756af1ba 100644
--- a/src/calibre/srv/cdb.py
+++ b/src/calibre/srv/cdb.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 from functools import partial
diff --git a/src/calibre/srv/changes.py b/src/calibre/srv/changes.py
index 03c7366564..5ac6907dbe 100644
--- a/src/calibre/srv/changes.py
+++ b/src/calibre/srv/changes.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from polyglot.builtins import map
 
 
diff --git a/src/calibre/srv/code.py b/src/calibre/srv/code.py
index 88aa69d96b..3ebb748427 100644
--- a/src/calibre/srv/code.py
+++ b/src/calibre/srv/code.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import hashlib
 import os
diff --git a/src/calibre/srv/content.py b/src/calibre/srv/content.py
index fc2bd1ba6f..85b50ea3a0 100644
--- a/src/calibre/srv/content.py
+++ b/src/calibre/srv/content.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/convert.py b/src/calibre/srv/convert.py
index 87697a0103..f586e8dbef 100644
--- a/src/calibre/srv/convert.py
+++ b/src/calibre/srv/convert.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import shutil
diff --git a/src/calibre/srv/embedded.py b/src/calibre/srv/embedded.py
index d488aea919..65558c3122 100644
--- a/src/calibre/srv/embedded.py
+++ b/src/calibre/srv/embedded.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import json
diff --git a/src/calibre/srv/errors.py b/src/calibre/srv/errors.py
index 705b949791..375ad7e583 100644
--- a/src/calibre/srv/errors.py
+++ b/src/calibre/srv/errors.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/handler.py b/src/calibre/srv/handler.py
index a8422e49ad..61c595d017 100644
--- a/src/calibre/srv/handler.py
+++ b/src/calibre/srv/handler.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 from functools import partial
diff --git a/src/calibre/srv/http_request.py b/src/calibre/srv/http_request.py
index 1948ffd1a2..3866edab0b 100644
--- a/src/calibre/srv/http_request.py
+++ b/src/calibre/srv/http_request.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/http_response.py b/src/calibre/srv/http_response.py
index 31838f1979..1fd74e3c73 100644
--- a/src/calibre/srv/http_response.py
+++ b/src/calibre/srv/http_response.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/jobs.py b/src/calibre/srv/jobs.py
index 5cfe25467b..f3e41078a9 100644
--- a/src/calibre/srv/jobs.py
+++ b/src/calibre/srv/jobs.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import os, time
 from itertools import count
 from collections import namedtuple, deque
diff --git a/src/calibre/srv/legacy.py b/src/calibre/srv/legacy.py
index 67f4bf713e..a6b863c629 100644
--- a/src/calibre/srv/legacy.py
+++ b/src/calibre/srv/legacy.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from functools import partial
 
diff --git a/src/calibre/srv/library_broker.py b/src/calibre/srv/library_broker.py
index facf856e9c..b56bf029a3 100644
--- a/src/calibre/srv/library_broker.py
+++ b/src/calibre/srv/library_broker.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 from collections import OrderedDict, defaultdict
diff --git a/src/calibre/srv/loop.py b/src/calibre/srv/loop.py
index 82c0053b2e..2023e023d5 100644
--- a/src/calibre/srv/loop.py
+++ b/src/calibre/srv/loop.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/manage_users_cli.py b/src/calibre/srv/manage_users_cli.py
index 2871a53a97..a6ee4f6b94 100644
--- a/src/calibre/srv/manage_users_cli.py
+++ b/src/calibre/srv/manage_users_cli.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys
 from functools import partial
diff --git a/src/calibre/srv/metadata.py b/src/calibre/srv/metadata.py
index bbf6773377..806d009b48 100644
--- a/src/calibre/srv/metadata.py
+++ b/src/calibre/srv/metadata.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import os
 from copy import copy
 from collections import namedtuple
diff --git a/src/calibre/srv/opds.py b/src/calibre/srv/opds.py
index ed41a6efa7..205e8bc834 100644
--- a/src/calibre/srv/opds.py
+++ b/src/calibre/srv/opds.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/srv/opts.py b/src/calibre/srv/opts.py
index 7e5a48ca58..e1a69d1a10 100644
--- a/src/calibre/srv/opts.py
+++ b/src/calibre/srv/opts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/pool.py b/src/calibre/srv/pool.py
index b14f6b3282..c658788be8 100644
--- a/src/calibre/srv/pool.py
+++ b/src/calibre/srv/pool.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/pre_activated.py b/src/calibre/srv/pre_activated.py
index e3da85d0cf..183cba1571 100644
--- a/src/calibre/srv/pre_activated.py
+++ b/src/calibre/srv/pre_activated.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/render_book.py b/src/calibre/srv/render_book.py
index 6005a8546e..1de49da445 100644
--- a/src/calibre/srv/render_book.py
+++ b/src/calibre/srv/render_book.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import os
diff --git a/src/calibre/srv/routes.py b/src/calibre/srv/routes.py
index a9c9353d3e..62ef365a78 100644
--- a/src/calibre/srv/routes.py
+++ b/src/calibre/srv/routes.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/sendfile.py b/src/calibre/srv/sendfile.py
index 8779f8a7cc..d3fbbd5c2f 100644
--- a/src/calibre/srv/sendfile.py
+++ b/src/calibre/srv/sendfile.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/standalone.py b/src/calibre/srv/standalone.py
index 635541e723..8d38e1ea0a 100644
--- a/src/calibre/srv/standalone.py
+++ b/src/calibre/srv/standalone.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import os
diff --git a/src/calibre/srv/tests/ajax.py b/src/calibre/srv/tests/ajax.py
index 23478cab24..ea821a36a7 100644
--- a/src/calibre/srv/tests/ajax.py
+++ b/src/calibre/srv/tests/ajax.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/tests/auth.py b/src/calibre/srv/tests/auth.py
index 58f54cbbd9..469a9582ed 100644
--- a/src/calibre/srv/tests/auth.py
+++ b/src/calibre/srv/tests/auth.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/tests/base.py b/src/calibre/srv/tests/base.py
index b610675f47..325c5c8456 100644
--- a/src/calibre/srv/tests/base.py
+++ b/src/calibre/srv/tests/base.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/srv/tests/content.py b/src/calibre/srv/tests/content.py
index 21ff69d10c..4df6eb1891 100644
--- a/src/calibre/srv/tests/content.py
+++ b/src/calibre/srv/tests/content.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/tests/http.py b/src/calibre/srv/tests/http.py
index 90d061fe72..e32f7dbcc7 100644
--- a/src/calibre/srv/tests/http.py
+++ b/src/calibre/srv/tests/http.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/tests/loop.py b/src/calibre/srv/tests/loop.py
index a5e927579e..8b25e7b448 100644
--- a/src/calibre/srv/tests/loop.py
+++ b/src/calibre/srv/tests/loop.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/tests/main.py b/src/calibre/srv/tests/main.py
index d5ec365d28..4da0b0a6e3 100644
--- a/src/calibre/srv/tests/main.py
+++ b/src/calibre/srv/tests/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/tests/routes.py b/src/calibre/srv/tests/routes.py
index 11577c8d4a..1250f003a3 100644
--- a/src/calibre/srv/tests/routes.py
+++ b/src/calibre/srv/tests/routes.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/tests/web_sockets.py b/src/calibre/srv/tests/web_sockets.py
index faf7071b11..1620fb7b5f 100644
--- a/src/calibre/srv/tests/web_sockets.py
+++ b/src/calibre/srv/tests/web_sockets.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import socket, os, struct, errno, numbers
 from collections import deque, namedtuple
diff --git a/src/calibre/srv/users.py b/src/calibre/srv/users.py
index 8c28ff4d70..657d6dac80 100644
--- a/src/calibre/srv/users.py
+++ b/src/calibre/srv/users.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import os, json, re
 from threading import RLock
 
diff --git a/src/calibre/srv/users_api.py b/src/calibre/srv/users_api.py
index a061881564..37ddb86cd7 100644
--- a/src/calibre/srv/users_api.py
+++ b/src/calibre/srv/users_api.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 
diff --git a/src/calibre/srv/utils.py b/src/calibre/srv/utils.py
index 376546a7a2..ffd3aee0f0 100644
--- a/src/calibre/srv/utils.py
+++ b/src/calibre/srv/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/srv/web_socket.py b/src/calibre/srv/web_socket.py
index 297277ae3f..0fb2302fe5 100644
--- a/src/calibre/srv/web_socket.py
+++ b/src/calibre/srv/web_socket.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import socket
diff --git a/src/calibre/startup.py b/src/calibre/startup.py
index 7508b24395..ea7837600b 100644
--- a/src/calibre/startup.py
+++ b/src/calibre/startup.py
@@ -1,4 +1,4 @@
-from __future__ import print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/test_build.py b/src/calibre/test_build.py
index af03323cc7..71885930c0 100644
--- a/src/calibre/test_build.py
+++ b/src/calibre/test_build.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/translations/__init__.py b/src/calibre/translations/__init__.py
index bb409a2f36..8b13789179 100644
--- a/src/calibre/translations/__init__.py
+++ b/src/calibre/translations/__init__.py
@@ -1 +1 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
diff --git a/src/calibre/translations/dynamic.py b/src/calibre/translations/dynamic.py
index e55e5bbbf2..fb2001d72b 100644
--- a/src/calibre/translations/dynamic.py
+++ b/src/calibre/translations/dynamic.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Dynamic language lookup of translations for user-visible strings.
 '''
diff --git a/src/calibre/translations/msgfmt.py b/src/calibre/translations/msgfmt.py
index 681a1d8482..989ceca5e7 100644
--- a/src/calibre/translations/msgfmt.py
+++ b/src/calibre/translations/msgfmt.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # Written by Martin v. Löwis <loewis@informatik.hu-berlin.de>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """Generate binary message catalog from textual translation description.
 
diff --git a/src/calibre/utils/Zeroconf.py b/src/calibre/utils/Zeroconf.py
index ee7157c076..62537988c5 100644
--- a/src/calibre/utils/Zeroconf.py
+++ b/src/calibre/utils/Zeroconf.py
@@ -19,7 +19,7 @@
     Lesser General Public License for more details.
 
 """
-from __future__ import print_function
+
 
 """0.13 update - fix IPv6 support
                  some cleanups in code"""
diff --git a/src/calibre/utils/__init__.py b/src/calibre/utils/__init__.py
index 1f006ac780..8b1eff4899 100644
--- a/src/calibre/utils/__init__.py
+++ b/src/calibre/utils/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/utils/bibtex.py b/src/calibre/utils/bibtex.py
index a6cc1ae9f4..5a8c726548 100644
--- a/src/calibre/utils/bibtex.py
+++ b/src/calibre/utils/bibtex.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """ Collection of python utility-methodes commonly used by other
     bibliograph packages.
diff --git a/src/calibre/utils/browser.py b/src/calibre/utils/browser.py
index 9503da87a1..12f1c6fec9 100644
--- a/src/calibre/utils/browser.py
+++ b/src/calibre/utils/browser.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import copy
 import ssl
diff --git a/src/calibre/utils/certgen.py b/src/calibre/utils/certgen.py
index 681448d408..babfc249ae 100644
--- a/src/calibre/utils/certgen.py
+++ b/src/calibre/utils/certgen.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/chm/__init__.py b/src/calibre/utils/chm/__init__.py
index 20f51ca699..3d329d9152 100644
--- a/src/calibre/utils/chm/__init__.py
+++ b/src/calibre/utils/chm/__init__.py
@@ -11,7 +11,7 @@
 # General Public License for more details.
 
 # $Id: __init__.py,v 1.8 2006/06/18 10:50:43 rubensr Exp $
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
    chm - A package to manipulate CHM files
diff --git a/src/calibre/utils/chm/chm.py b/src/calibre/utils/chm/chm.py
index fbcecfd150..4791d90ee8 100644
--- a/src/calibre/utils/chm/chm.py
+++ b/src/calibre/utils/chm/chm.py
@@ -14,7 +14,7 @@
 # General Public License for more details.
 
 # $Id: chm.py,v 1.12 2006/08/07 12:31:51 rubensr Exp $
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
    chm - A high-level front end for the chmlib python module.
diff --git a/src/calibre/utils/cleantext.py b/src/calibre/utils/cleantext.py
index 9d873cea22..9b272288ab 100644
--- a/src/calibre/utils/cleantext.py
+++ b/src/calibre/utils/cleantext.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import re
 from polyglot.builtins import codepoint_to_chr, map, range, filter
diff --git a/src/calibre/utils/complete.py b/src/calibre/utils/complete.py
index 77fcf8fd49..9bfe5e9b19 100644
--- a/src/calibre/utils/complete.py
+++ b/src/calibre/utils/complete.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/config.py b/src/calibre/utils/config.py
index 6c242d8b6f..5be19df88a 100644
--- a/src/calibre/utils/config.py
+++ b/src/calibre/utils/config.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/utils/config_base.py b/src/calibre/utils/config_base.py
index 1536068415..04e65bd95b 100644
--- a/src/calibre/utils/config_base.py
+++ b/src/calibre/utils/config_base.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/date.py b/src/calibre/utils/date.py
index b622abd559..3d84d2ee82 100644
--- a/src/calibre/utils/date.py
+++ b/src/calibre/utils/date.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/dbus_service.py b/src/calibre/utils/dbus_service.py
index 2d14506260..feac589e1a 100644
--- a/src/calibre/utils/dbus_service.py
+++ b/src/calibre/utils/dbus_service.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 # Copyright (C) 2003-2006 Red Hat Inc. <http://www.redhat.com/>
 # Copyright (C) 2003 David Zeuthen
diff --git a/src/calibre/utils/exim.py b/src/calibre/utils/exim.py
index a9a9ebc0dd..0e6749c2d6 100644
--- a/src/calibre/utils/exim.py
+++ b/src/calibre/utils/exim.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os, json, struct, hashlib, sys, errno, tempfile, time, shutil, uuid
 from collections import Counter
diff --git a/src/calibre/utils/file_type_icons.py b/src/calibre/utils/file_type_icons.py
index d6f6912617..afa069bbf1 100644
--- a/src/calibre/utils/file_type_icons.py
+++ b/src/calibre/utils/file_type_icons.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 EXT_MAP = {
     'default' : 'unknown',
diff --git a/src/calibre/utils/filenames.py b/src/calibre/utils/filenames.py
index 7b322b26c9..8ab1c2a460 100644
--- a/src/calibre/utils/filenames.py
+++ b/src/calibre/utils/filenames.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Make strings safe for use as ASCII filenames, while trying to preserve as much
 meaning as possible.
diff --git a/src/calibre/utils/fonts/__init__.py b/src/calibre/utils/fonts/__init__.py
index a9b056d940..d8edc6064a 100644
--- a/src/calibre/utils/fonts/__init__.py
+++ b/src/calibre/utils/fonts/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/free_type.py b/src/calibre/utils/fonts/free_type.py
index f772244e28..1a62d34652 100644
--- a/src/calibre/utils/fonts/free_type.py
+++ b/src/calibre/utils/fonts/free_type.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/metadata.py b/src/calibre/utils/fonts/metadata.py
index 7386c6dc41..8171702881 100644
--- a/src/calibre/utils/fonts/metadata.py
+++ b/src/calibre/utils/fonts/metadata.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/scanner.py b/src/calibre/utils/fonts/scanner.py
index bf6acff568..0092072b3f 100644
--- a/src/calibre/utils/fonts/scanner.py
+++ b/src/calibre/utils/fonts/scanner.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/__init__.py b/src/calibre/utils/fonts/sfnt/__init__.py
index 2bf754bd0c..c37f44c3ed 100644
--- a/src/calibre/utils/fonts/sfnt/__init__.py
+++ b/src/calibre/utils/fonts/sfnt/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/cff/__init__.py b/src/calibre/utils/fonts/sfnt/cff/__init__.py
index 2b86b54dc3..3610d3374c 100644
--- a/src/calibre/utils/fonts/sfnt/cff/__init__.py
+++ b/src/calibre/utils/fonts/sfnt/cff/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/cff/constants.py b/src/calibre/utils/fonts/sfnt/cff/constants.py
index e4b4907ad4..8f5e729254 100644
--- a/src/calibre/utils/fonts/sfnt/cff/constants.py
+++ b/src/calibre/utils/fonts/sfnt/cff/constants.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/cff/dict_data.py b/src/calibre/utils/fonts/sfnt/cff/dict_data.py
index e9ecef3b88..47d1457e55 100644
--- a/src/calibre/utils/fonts/sfnt/cff/dict_data.py
+++ b/src/calibre/utils/fonts/sfnt/cff/dict_data.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/cff/table.py b/src/calibre/utils/fonts/sfnt/cff/table.py
index 2f653ab59f..1afa3781b3 100644
--- a/src/calibre/utils/fonts/sfnt/cff/table.py
+++ b/src/calibre/utils/fonts/sfnt/cff/table.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/cff/writer.py b/src/calibre/utils/fonts/sfnt/cff/writer.py
index b447af68f1..b6add7dc98 100644
--- a/src/calibre/utils/fonts/sfnt/cff/writer.py
+++ b/src/calibre/utils/fonts/sfnt/cff/writer.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/cmap.py b/src/calibre/utils/fonts/sfnt/cmap.py
index d270b313b6..102152ea9b 100644
--- a/src/calibre/utils/fonts/sfnt/cmap.py
+++ b/src/calibre/utils/fonts/sfnt/cmap.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/common.py b/src/calibre/utils/fonts/sfnt/common.py
index c8c9d4e5c1..46889ebdb6 100644
--- a/src/calibre/utils/fonts/sfnt/common.py
+++ b/src/calibre/utils/fonts/sfnt/common.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/container.py b/src/calibre/utils/fonts/sfnt/container.py
index bfdfddf399..1ed38d63cf 100644
--- a/src/calibre/utils/fonts/sfnt/container.py
+++ b/src/calibre/utils/fonts/sfnt/container.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
 # License: GPLv3 Copyright: 2012, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import OrderedDict
 from io import BytesIO
diff --git a/src/calibre/utils/fonts/sfnt/errors.py b/src/calibre/utils/fonts/sfnt/errors.py
index 7859063f01..0b9bddbeb2 100644
--- a/src/calibre/utils/fonts/sfnt/errors.py
+++ b/src/calibre/utils/fonts/sfnt/errors.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/glyf.py b/src/calibre/utils/fonts/sfnt/glyf.py
index 22700b2e1d..8bd5e6b0b7 100644
--- a/src/calibre/utils/fonts/sfnt/glyf.py
+++ b/src/calibre/utils/fonts/sfnt/glyf.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/gsub.py b/src/calibre/utils/fonts/sfnt/gsub.py
index 42f8135ee2..3328979bc4 100644
--- a/src/calibre/utils/fonts/sfnt/gsub.py
+++ b/src/calibre/utils/fonts/sfnt/gsub.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/head.py b/src/calibre/utils/fonts/sfnt/head.py
index b01c296274..e6807cebcf 100644
--- a/src/calibre/utils/fonts/sfnt/head.py
+++ b/src/calibre/utils/fonts/sfnt/head.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/kern.py b/src/calibre/utils/fonts/sfnt/kern.py
index 531249d15f..983e49beb3 100644
--- a/src/calibre/utils/fonts/sfnt/kern.py
+++ b/src/calibre/utils/fonts/sfnt/kern.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/loca.py b/src/calibre/utils/fonts/sfnt/loca.py
index e5eca29a8d..dee0462015 100644
--- a/src/calibre/utils/fonts/sfnt/loca.py
+++ b/src/calibre/utils/fonts/sfnt/loca.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/maxp.py b/src/calibre/utils/fonts/sfnt/maxp.py
index e5e769e0c1..9d5b69d94b 100644
--- a/src/calibre/utils/fonts/sfnt/maxp.py
+++ b/src/calibre/utils/fonts/sfnt/maxp.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/merge.py b/src/calibre/utils/fonts/sfnt/merge.py
index cb0caf6b57..66b61626b5 100644
--- a/src/calibre/utils/fonts/sfnt/merge.py
+++ b/src/calibre/utils/fonts/sfnt/merge.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import OrderedDict
 from functools import partial
diff --git a/src/calibre/utils/fonts/sfnt/metrics.py b/src/calibre/utils/fonts/sfnt/metrics.py
index 4b397a307b..bdfef6bd3e 100644
--- a/src/calibre/utils/fonts/sfnt/metrics.py
+++ b/src/calibre/utils/fonts/sfnt/metrics.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/sfnt/subset.py b/src/calibre/utils/fonts/sfnt/subset.py
index 0827d794fa..6652fe4c96 100644
--- a/src/calibre/utils/fonts/sfnt/subset.py
+++ b/src/calibre/utils/fonts/sfnt/subset.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/utils.py b/src/calibre/utils/fonts/utils.py
index 2e21693b76..8a281f1722 100644
--- a/src/calibre/utils/fonts/utils.py
+++ b/src/calibre/utils/fonts/utils.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/fonts/win_fonts.py b/src/calibre/utils/fonts/win_fonts.py
index 204573a989..9826d2709a 100644
--- a/src/calibre/utils/fonts/win_fonts.py
+++ b/src/calibre/utils/fonts/win_fonts.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/formatter.py b/src/calibre/utils/formatter.py
index a82e08c5a9..f3f615a035 100644
--- a/src/calibre/utils/formatter.py
+++ b/src/calibre/utils/formatter.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 '''
 Created on 23 Sep 2010
 
diff --git a/src/calibre/utils/formatter_functions.py b/src/calibre/utils/formatter_functions.py
index 115509db05..34843fe08e 100644
--- a/src/calibre/utils/formatter_functions.py
+++ b/src/calibre/utils/formatter_functions.py
@@ -6,7 +6,7 @@ Created on 13 Jan 2011
 
 @author: charles
 '''
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/html2text.py b/src/calibre/utils/html2text.py
index 94152be69b..b34f9965ad 100644
--- a/src/calibre/utils/html2text.py
+++ b/src/calibre/utils/html2text.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 def html2text(html):
diff --git a/src/calibre/utils/https.py b/src/calibre/utils/https.py
index a1716a124c..634cc6ba4a 100644
--- a/src/calibre/utils/https.py
+++ b/src/calibre/utils/https.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/icu.py b/src/calibre/utils/icu.py
index 9013b68d85..edb6e6c662 100644
--- a/src/calibre/utils/icu.py
+++ b/src/calibre/utils/icu.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/icu_test.py b/src/calibre/utils/icu_test.py
index 1f7a6c3b17..ba87e155f7 100644
--- a/src/calibre/utils/icu_test.py
+++ b/src/calibre/utils/icu_test.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/img.py b/src/calibre/utils/img.py
index 7be7648e68..a1b2ddc9e2 100644
--- a/src/calibre/utils/img.py
+++ b/src/calibre/utils/img.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015-2019, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import os
diff --git a/src/calibre/utils/imghdr.py b/src/calibre/utils/imghdr.py
index 57c9abf84f..72221e4939 100644
--- a/src/calibre/utils/imghdr.py
+++ b/src/calibre/utils/imghdr.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from struct import unpack, error
 import os
diff --git a/src/calibre/utils/inotify.py b/src/calibre/utils/inotify.py
index 7c84204c86..4d318374d4 100644
--- a/src/calibre/utils/inotify.py
+++ b/src/calibre/utils/inotify.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/ip_routing.py b/src/calibre/utils/ip_routing.py
index 1460de8b5e..0f91f0001d 100644
--- a/src/calibre/utils/ip_routing.py
+++ b/src/calibre/utils/ip_routing.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import subprocess, re
 from calibre.constants import iswindows, isosx
 
diff --git a/src/calibre/utils/ipc/__init__.py b/src/calibre/utils/ipc/__init__.py
index f1a166209a..a2355fb7e3 100644
--- a/src/calibre/utils/ipc/__init__.py
+++ b/src/calibre/utils/ipc/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/ipc/job.py b/src/calibre/utils/ipc/job.py
index 83816bc544..a36de1a276 100644
--- a/src/calibre/utils/ipc/job.py
+++ b/src/calibre/utils/ipc/job.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/ipc/launch.py b/src/calibre/utils/ipc/launch.py
index fbf543b880..88b112c4b0 100644
--- a/src/calibre/utils/ipc/launch.py
+++ b/src/calibre/utils/ipc/launch.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/ipc/pool.py b/src/calibre/utils/ipc/pool.py
index 312d10127d..4e4f28afef 100644
--- a/src/calibre/utils/ipc/pool.py
+++ b/src/calibre/utils/ipc/pool.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/ipc/server.py b/src/calibre/utils/ipc/server.py
index abd35bb8ef..97a9ba84aa 100644
--- a/src/calibre/utils/ipc/server.py
+++ b/src/calibre/utils/ipc/server.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/ipc/simple_worker.py b/src/calibre/utils/ipc/simple_worker.py
index 957e2f9299..91076187e1 100644
--- a/src/calibre/utils/ipc/simple_worker.py
+++ b/src/calibre/utils/ipc/simple_worker.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/ipc/worker.py b/src/calibre/utils/ipc/worker.py
index f095713cc0..4756ca2cc5 100644
--- a/src/calibre/utils/ipc/worker.py
+++ b/src/calibre/utils/ipc/worker.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/iphlpapi.py b/src/calibre/utils/iphlpapi.py
index a125f77d4d..fa62d71bad 100644
--- a/src/calibre/utils/iphlpapi.py
+++ b/src/calibre/utils/iphlpapi.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import ctypes
 from ctypes import windll
 from ctypes import wintypes
diff --git a/src/calibre/utils/ipython.py b/src/calibre/utils/ipython.py
index d90b945b20..3b7656dc53 100644
--- a/src/calibre/utils/ipython.py
+++ b/src/calibre/utils/ipython.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/iso8601.py b/src/calibre/utils/iso8601.py
index 516dc4260d..78d9954206 100644
--- a/src/calibre/utils/iso8601.py
+++ b/src/calibre/utils/iso8601.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from datetime import datetime
 
 from dateutil.tz import tzlocal, tzutc, tzoffset
diff --git a/src/calibre/utils/linux_trash.py b/src/calibre/utils/linux_trash.py
index 4c208ed3e4..13bf248b80 100644
--- a/src/calibre/utils/linux_trash.py
+++ b/src/calibre/utils/linux_trash.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 # Copyright 2010 Hardcoded Software (http://www.hardcoded.net)
 
diff --git a/src/calibre/utils/localization.py b/src/calibre/utils/localization.py
index fa784c9b38..11189f099f 100644
--- a/src/calibre/utils/localization.py
+++ b/src/calibre/utils/localization.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/localunzip.py b/src/calibre/utils/localunzip.py
index ea4e67eb62..95d6fa485e 100644
--- a/src/calibre/utils/localunzip.py
+++ b/src/calibre/utils/localunzip.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/lock.py b/src/calibre/utils/lock.py
index 4d71754e9f..c1115af6cb 100644
--- a/src/calibre/utils/lock.py
+++ b/src/calibre/utils/lock.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import atexit
 import errno
diff --git a/src/calibre/utils/logging.py b/src/calibre/utils/logging.py
index 1f8a5d71a9..e6449caf3f 100644
--- a/src/calibre/utils/logging.py
+++ b/src/calibre/utils/logging.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/magick/__init__.py b/src/calibre/utils/magick/__init__.py
index 11d5537216..dcf0f69273 100644
--- a/src/calibre/utils/magick/__init__.py
+++ b/src/calibre/utils/magick/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/magick/draw.py b/src/calibre/utils/magick/draw.py
index e741f8dc16..76f8493f5c 100644
--- a/src/calibre/utils/magick/draw.py
+++ b/src/calibre/utils/magick/draw.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/magick/legacy.py b/src/calibre/utils/magick/legacy.py
index 97b3270469..a75dbcbc4b 100644
--- a/src/calibre/utils/magick/legacy.py
+++ b/src/calibre/utils/magick/legacy.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import os
 from io import BytesIO
 
diff --git a/src/calibre/utils/matcher.py b/src/calibre/utils/matcher.py
index 813e573105..a91d5a6a39 100644
--- a/src/calibre/utils/matcher.py
+++ b/src/calibre/utils/matcher.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/mdns.py b/src/calibre/utils/mdns.py
index b1435e1d15..a25e3f2d8b 100644
--- a/src/calibre/utils/mdns.py
+++ b/src/calibre/utils/mdns.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/mem.py b/src/calibre/utils/mem.py
index 4313c21cb0..672dd54587 100644
--- a/src/calibre/utils/mem.py
+++ b/src/calibre/utils/mem.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/monotonic.py b/src/calibre/utils/monotonic.py
index 9d5840daff..1bb4f3fe72 100644
--- a/src/calibre/utils/monotonic.py
+++ b/src/calibre/utils/monotonic.py
@@ -1,5 +1,5 @@
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 try:
     from time import monotonic
diff --git a/src/calibre/utils/mreplace.py b/src/calibre/utils/mreplace.py
index eb2059f0d3..7c0af13730 100644
--- a/src/calibre/utils/mreplace.py
+++ b/src/calibre/utils/mreplace.py
@@ -1,5 +1,5 @@
 # multiple replace from dictionnary : http://code.activestate.com/recipes/81330/
-from __future__ import unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2010, sengian <sengian1 @ gmail.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/network.py b/src/calibre/utils/network.py
index 5c808cf754..25d69ef552 100644
--- a/src/calibre/utils/network.py
+++ b/src/calibre/utils/network.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from calibre.constants import iswindows, islinux, isbsd
 from calibre.utils.config_base import tweaks
diff --git a/src/calibre/utils/open_with/linux.py b/src/calibre/utils/open_with/linux.py
index c2847ce78f..8e2bd27b36 100644
--- a/src/calibre/utils/open_with/linux.py
+++ b/src/calibre/utils/open_with/linux.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/open_with/osx.py b/src/calibre/utils/open_with/osx.py
index ed8d25c82a..c297f3e37f 100644
--- a/src/calibre/utils/open_with/osx.py
+++ b/src/calibre/utils/open_with/osx.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/open_with/windows.py b/src/calibre/utils/open_with/windows.py
index 81e16fec01..8e8bdafd2a 100644
--- a/src/calibre/utils/open_with/windows.py
+++ b/src/calibre/utils/open_with/windows.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/opensearch/__init__.py b/src/calibre/utils/opensearch/__init__.py
index 81963d5ac2..b364b9dbac 100644
--- a/src/calibre/utils/opensearch/__init__.py
+++ b/src/calibre/utils/opensearch/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Based on the OpenSearch Python module by Ed Summers <ehs@pobox.com> from
diff --git a/src/calibre/utils/opensearch/description.py b/src/calibre/utils/opensearch/description.py
index c5f90671ab..68d331114d 100644
--- a/src/calibre/utils/opensearch/description.py
+++ b/src/calibre/utils/opensearch/description.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/utils/opensearch/query.py b/src/calibre/utils/opensearch/query.py
index 786fe22623..643cf5827e 100644
--- a/src/calibre/utils/opensearch/query.py
+++ b/src/calibre/utils/opensearch/query.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/utils/opensearch/url.py b/src/calibre/utils/opensearch/url.py
index 5d1cb18e90..2e8a23e91c 100644
--- a/src/calibre/utils/opensearch/url.py
+++ b/src/calibre/utils/opensearch/url.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/utils/ordered_dict.py b/src/calibre/utils/ordered_dict.py
index f3176feeea..47fc1ce803 100644
--- a/src/calibre/utils/ordered_dict.py
+++ b/src/calibre/utils/ordered_dict.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/podofo/__init__.py b/src/calibre/utils/podofo/__init__.py
index 56e471b694..92f6286dfb 100644
--- a/src/calibre/utils/podofo/__init__.py
+++ b/src/calibre/utils/podofo/__init__.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 # License: GPLv3 Copyright: 2009, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import shutil
diff --git a/src/calibre/utils/random_ua.py b/src/calibre/utils/random_ua.py
index 34755c16b8..e24f51dc74 100644
--- a/src/calibre/utils/random_ua.py
+++ b/src/calibre/utils/random_ua.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import json
 import random
diff --git a/src/calibre/utils/rapydscript.py b/src/calibre/utils/rapydscript.py
index 0acc82ed96..e4a20c87c8 100644
--- a/src/calibre/utils/rapydscript.py
+++ b/src/calibre/utils/rapydscript.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import errno
 import json
diff --git a/src/calibre/utils/recycle_bin.py b/src/calibre/utils/recycle_bin.py
index 5119a9c74c..923a51920f 100644
--- a/src/calibre/utils/recycle_bin.py
+++ b/src/calibre/utils/recycle_bin.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/resources.py b/src/calibre/utils/resources.py
index 7062db6b10..3b594c896a 100644
--- a/src/calibre/utils/resources.py
+++ b/src/calibre/utils/resources.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/run_tests.py b/src/calibre/utils/run_tests.py
index b75896f753..9cf8689141 100644
--- a/src/calibre/utils/run_tests.py
+++ b/src/calibre/utils/run_tests.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 import unittest, functools, os, importlib, zipfile
 from calibre.utils.monotonic import monotonic
 
diff --git a/src/calibre/utils/search_query_parser.py b/src/calibre/utils/search_query_parser.py
index 38f53cc87c..3dc68f6580 100644
--- a/src/calibre/utils/search_query_parser.py
+++ b/src/calibre/utils/search_query_parser.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # encoding: utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
diff --git a/src/calibre/utils/search_query_parser_test.py b/src/calibre/utils/search_query_parser_test.py
index 36df945ee9..b204e369e1 100644
--- a/src/calibre/utils/search_query_parser_test.py
+++ b/src/calibre/utils/search_query_parser_test.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import operator
 import unittest
diff --git a/src/calibre/utils/serialize.py b/src/calibre/utils/serialize.py
index 692d78eac8..1f9e0b38be 100644
--- a/src/calibre/utils/serialize.py
+++ b/src/calibre/utils/serialize.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import unicode_type
 from calibre.constants import ispy3
diff --git a/src/calibre/utils/shared_file.py b/src/calibre/utils/shared_file.py
index e1fef31243..44aac391bf 100644
--- a/src/calibre/utils/shared_file.py
+++ b/src/calibre/utils/shared_file.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/short_uuid.py b/src/calibre/utils/short_uuid.py
index f0b5a7e31d..345ddb2647 100644
--- a/src/calibre/utils/short_uuid.py
+++ b/src/calibre/utils/short_uuid.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Generate UUID encoded using a user specified alphabet.
diff --git a/src/calibre/utils/smartypants.py b/src/calibre/utils/smartypants.py
index dc4ad4ec90..eaf548f4f6 100644
--- a/src/calibre/utils/smartypants.py
+++ b/src/calibre/utils/smartypants.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __author__ = "Chad Miller <smartypantspy@chad.org>, Kovid Goyal <kovid at kovidgoyal.net>"
 __description__ = "Smart-quotes, smart-ellipses, and smart-dashes for weblog entries in pyblosxom"
diff --git a/src/calibre/utils/smtp.py b/src/calibre/utils/smtp.py
index 4dd11eca54..f945f361c9 100644
--- a/src/calibre/utils/smtp.py
+++ b/src/calibre/utils/smtp.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL 3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/smtplib.py b/src/calibre/utils/smtplib.py
index 25029dedbd..437519b8ac 100644
--- a/src/calibre/utils/smtplib.py
+++ b/src/calibre/utils/smtplib.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import print_function
+
 
 '''SMTP/ESMTP client class.
 
diff --git a/src/calibre/utils/socket_inheritance.py b/src/calibre/utils/socket_inheritance.py
index 5af4ce7a92..649f647229 100644
--- a/src/calibre/utils/socket_inheritance.py
+++ b/src/calibre/utils/socket_inheritance.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 '''
 Created on 29 Nov 2013
diff --git a/src/calibre/utils/speedups.py b/src/calibre/utils/speedups.py
index 0786456503..a8874cde5f 100644
--- a/src/calibre/utils/speedups.py
+++ b/src/calibre/utils/speedups.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 from polyglot.builtins import range, unicode_type
diff --git a/src/calibre/utils/spell/__init__.py b/src/calibre/utils/spell/__init__.py
index 69376f9ebd..e4102b4b10 100644
--- a/src/calibre/utils/spell/__init__.py
+++ b/src/calibre/utils/spell/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/tdir_in_cache.py b/src/calibre/utils/tdir_in_cache.py
index a5bb58293b..d297022486 100644
--- a/src/calibre/utils/tdir_in_cache.py
+++ b/src/calibre/utils/tdir_in_cache.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import atexit
 import errno
diff --git a/src/calibre/utils/terminal.py b/src/calibre/utils/terminal.py
index a640c573eb..d945da9e56 100644
--- a/src/calibre/utils/terminal.py
+++ b/src/calibre/utils/terminal.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/test_lock.py b/src/calibre/utils/test_lock.py
index 6f6a2def5e..625bd431a8 100644
--- a/src/calibre/utils/test_lock.py
+++ b/src/calibre/utils/test_lock.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import shutil
diff --git a/src/calibre/utils/text2int.py b/src/calibre/utils/text2int.py
index 1aa70916d4..27c3061b90 100644
--- a/src/calibre/utils/text2int.py
+++ b/src/calibre/utils/text2int.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __author__ = "stackoverflow community"
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/threadpool.py b/src/calibre/utils/threadpool.py
index 173009d33f..4eed2b8b8b 100644
--- a/src/calibre/utils/threadpool.py
+++ b/src/calibre/utils/threadpool.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """Easy to use object-oriented thread pool framework.
 
diff --git a/src/calibre/utils/titlecase.py b/src/calibre/utils/titlecase.py
index fec245c494..04544a4dcd 100644
--- a/src/calibre/utils/titlecase.py
+++ b/src/calibre/utils/titlecase.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """
 Original Perl version by: John Gruber https://daringfireball.net/ 10 May 2008
diff --git a/src/calibre/utils/unicode_getpass.py b/src/calibre/utils/unicode_getpass.py
index d1245096f5..2c36ca9968 100644
--- a/src/calibre/utils/unicode_getpass.py
+++ b/src/calibre/utils/unicode_getpass.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys
 
diff --git a/src/calibre/utils/unicode_names.py b/src/calibre/utils/unicode_names.py
index f6e4e42f9f..443e07f0b2 100644
--- a/src/calibre/utils/unicode_names.py
+++ b/src/calibre/utils/unicode_names.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from collections import defaultdict
 
diff --git a/src/calibre/utils/unrar.py b/src/calibre/utils/unrar.py
index 9dc3d6d42a..b248de03e0 100644
--- a/src/calibre/utils/unrar.py
+++ b/src/calibre/utils/unrar.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:fdm=marker:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2012, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/unsmarten.py b/src/calibre/utils/unsmarten.py
index 10cf0bdfc0..b9b460e266 100644
--- a/src/calibre/utils/unsmarten.py
+++ b/src/calibre/utils/unsmarten.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 
 __license__ = 'GPL 3'
diff --git a/src/calibre/utils/windows/wintest.py b/src/calibre/utils/windows/wintest.py
index 142cb7361e..907ba88501 100644
--- a/src/calibre/utils/windows/wintest.py
+++ b/src/calibre/utils/windows/wintest.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import unittest
diff --git a/src/calibre/utils/winreg/dde.py b/src/calibre/utils/winreg/dde.py
index d3806be481..fb5a399cb6 100644
--- a/src/calibre/utils/winreg/dde.py
+++ b/src/calibre/utils/winreg/dde.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/winreg/default_programs.py b/src/calibre/utils/winreg/default_programs.py
index f597d8c36b..55b55c0665 100644
--- a/src/calibre/utils/winreg/default_programs.py
+++ b/src/calibre/utils/winreg/default_programs.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/winreg/lib.py b/src/calibre/utils/winreg/lib.py
index 1295297dea..71298b3e94 100644
--- a/src/calibre/utils/winreg/lib.py
+++ b/src/calibre/utils/winreg/lib.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/wmf/__init__.py b/src/calibre/utils/wmf/__init__.py
index 3b2e3a7da4..65c0e05acd 100644
--- a/src/calibre/utils/wmf/__init__.py
+++ b/src/calibre/utils/wmf/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/wmf/emf.py b/src/calibre/utils/wmf/emf.py
index 3fec5acd01..575785eb22 100644
--- a/src/calibre/utils/wmf/emf.py
+++ b/src/calibre/utils/wmf/emf.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/utils/wmf/parse.py b/src/calibre/utils/wmf/parse.py
index 85fdfd8754..e77018d0f7 100644
--- a/src/calibre/utils/wmf/parse.py
+++ b/src/calibre/utils/wmf/parse.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/utils/wordcount.py b/src/calibre/utils/wordcount.py
index 6afa979ebd..1efb61ba38 100644
--- a/src/calibre/utils/wordcount.py
+++ b/src/calibre/utils/wordcount.py
@@ -1,7 +1,7 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 """
 Get word, character, and Asian character counts
diff --git a/src/calibre/utils/zipfile.py b/src/calibre/utils/zipfile.py
index 93034cbcba..34172cf0b0 100644
--- a/src/calibre/utils/zipfile.py
+++ b/src/calibre/utils/zipfile.py
@@ -1,4 +1,4 @@
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 """
 Read and write ZIP files. Modified by Kovid Goyal to support replacing files in
 a zip archive, detecting filename encoding, updating zip files, etc.
diff --git a/src/calibre/web/__init__.py b/src/calibre/web/__init__.py
index 9d0db56732..5a29c44bd1 100644
--- a/src/calibre/web/__init__.py
+++ b/src/calibre/web/__init__.py
@@ -1,4 +1,4 @@
-from __future__ import unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/web/feeds/__init__.py b/src/calibre/web/feeds/__init__.py
index 02ce6cce46..88fc1dc822 100644
--- a/src/calibre/web/feeds/__init__.py
+++ b/src/calibre/web/feeds/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-from __future__ import print_function, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 '''
diff --git a/src/calibre/web/feeds/news.py b/src/calibre/web/feeds/news.py
index 7410ea022c..c57c68c536 100644
--- a/src/calibre/web/feeds/news.py
+++ b/src/calibre/web/feeds/news.py
@@ -1,4 +1,4 @@
-from __future__ import with_statement, unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 '''
diff --git a/src/calibre/web/feeds/recipes/__init__.py b/src/calibre/web/feeds/recipes/__init__.py
index eec8c12524..48277847da 100644
--- a/src/calibre/web/feeds/recipes/__init__.py
+++ b/src/calibre/web/feeds/recipes/__init__.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 '''
diff --git a/src/calibre/web/feeds/recipes/collection.py b/src/calibre/web/feeds/recipes/collection.py
index 68f2ea419f..6fa17973a2 100644
--- a/src/calibre/web/feeds/recipes/collection.py
+++ b/src/calibre/web/feeds/recipes/collection.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement, print_function, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/web/feeds/recipes/model.py b/src/calibre/web/feeds/recipes/model.py
index d362bec6f0..3db2bc31fe 100644
--- a/src/calibre/web/feeds/recipes/model.py
+++ b/src/calibre/web/feeds/recipes/model.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
-from __future__ import with_statement, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
diff --git a/src/calibre/web/feeds/templates.py b/src/calibre/web/feeds/templates.py
index 1c40fc64f3..94815080a3 100644
--- a/src/calibre/web/feeds/templates.py
+++ b/src/calibre/web/feeds/templates.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/web/fetch/__init__.py b/src/calibre/web/fetch/__init__.py
index 6e201b0e36..9d7bde35f7 100644
--- a/src/calibre/web/fetch/__init__.py
+++ b/src/calibre/web/fetch/__init__.py
@@ -1,3 +1,3 @@
-from __future__ import unicode_literals
+
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/web/fetch/simple.py b/src/calibre/web/fetch/simple.py
index 6a28d71d2e..606eb1e29b 100644
--- a/src/calibre/web/fetch/simple.py
+++ b/src/calibre/web/fetch/simple.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python
-from __future__ import print_function, with_statement, unicode_literals
+
 
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre/web/fetch/utils.py b/src/calibre/web/fetch/utils.py
index 1680103598..a3e2068693 100644
--- a/src/calibre/web/fetch/utils.py
+++ b/src/calibre/web/fetch/utils.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 from calibre.utils.img import image_from_data, scale_image, image_to_data, blend_on_canvas
 
 
diff --git a/src/calibre_lzma/__init__.py b/src/calibre_lzma/__init__.py
index cbf4297d76..437c828c1d 100644
--- a/src/calibre_lzma/__init__.py
+++ b/src/calibre_lzma/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre_lzma/errors.py b/src/calibre_lzma/errors.py
index f07f46b2a4..d81cfff05f 100644
--- a/src/calibre_lzma/errors.py
+++ b/src/calibre_lzma/errors.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre_lzma/lzma1.py b/src/calibre_lzma/lzma1.py
index 1d11d9596c..8648211f28 100644
--- a/src/calibre_lzma/lzma1.py
+++ b/src/calibre_lzma/lzma1.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/calibre_lzma/xz.py b/src/calibre_lzma/xz.py
index 73227bddc8..ab07098400 100644
--- a/src/calibre_lzma/xz.py
+++ b/src/calibre_lzma/xz.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/css_selectors/__init__.py b/src/css_selectors/__init__.py
index d54aa48073..88ce09a151 100644
--- a/src/css_selectors/__init__.py
+++ b/src/css_selectors/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/css_selectors/errors.py b/src/css_selectors/errors.py
index c49a71fbcc..f7293cb8c3 100644
--- a/src/css_selectors/errors.py
+++ b/src/css_selectors/errors.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/css_selectors/ordered_set.py b/src/css_selectors/ordered_set.py
index 7a6f9e2ce5..369d3e122d 100644
--- a/src/css_selectors/ordered_set.py
+++ b/src/css_selectors/ordered_set.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/css_selectors/select.py b/src/css_selectors/select.py
index 0ee4471737..707fadab69 100644
--- a/src/css_selectors/select.py
+++ b/src/css_selectors/select.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/css_selectors/tests.py b/src/css_selectors/tests.py
index 8a80fc6227..c06cc8737e 100644
--- a/src/css_selectors/tests.py
+++ b/src/css_selectors/tests.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2015, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/odf/__init__.py b/src/odf/__init__.py
index d61b93c279..8b13789179 100644
--- a/src/odf/__init__.py
+++ b/src/odf/__init__.py
@@ -1 +1 @@
-from __future__ import print_function, unicode_literals, absolute_import, division
+
diff --git a/src/odf/anim.py b/src/odf/anim.py
index 08b04e6650..8d039950f1 100644
--- a/src/odf/anim.py
+++ b/src/odf/anim.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import ANIMNS
 from .element import Element
 
diff --git a/src/odf/attrconverters.py b/src/odf/attrconverters.py
index 6567bf2ae5..92e912340b 100644
--- a/src/odf/attrconverters.py
+++ b/src/odf/attrconverters.py
@@ -17,7 +17,7 @@
 #
 # Contributor(s):
 #
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 import re
 
 from .namespaces import (
diff --git a/src/odf/chart.py b/src/odf/chart.py
index 28dc3ddc70..064aa8b768 100644
--- a/src/odf/chart.py
+++ b/src/odf/chart.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import CHARTNS
 from .element import Element
 
diff --git a/src/odf/config.py b/src/odf/config.py
index be6f4f7837..d938cb2320 100644
--- a/src/odf/config.py
+++ b/src/odf/config.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import CONFIGNS
 from .element import Element
 
diff --git a/src/odf/dc.py b/src/odf/dc.py
index 26b5bc8b66..55d30e448d 100644
--- a/src/odf/dc.py
+++ b/src/odf/dc.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import DCNS
 from .element import Element
 
diff --git a/src/odf/dr3d.py b/src/odf/dr3d.py
index b59d6236a8..c60373693a 100644
--- a/src/odf/dr3d.py
+++ b/src/odf/dr3d.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import DR3DNS
 from .draw import StyleRefElement
 
diff --git a/src/odf/draw.py b/src/odf/draw.py
index a194c76b59..ed1def0f2c 100644
--- a/src/odf/draw.py
+++ b/src/odf/draw.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import DRAWNS, STYLENS, PRESENTATIONNS
 from .element import Element
 
diff --git a/src/odf/easyliststyle.py b/src/odf/easyliststyle.py
index 2f640e850e..4fe51a81b5 100644
--- a/src/odf/easyliststyle.py
+++ b/src/odf/easyliststyle.py
@@ -19,7 +19,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 import re
 from .style import ListLevelProperties
 from .text import ListStyle,ListLevelStyleNumber,ListLevelStyleBullet
diff --git a/src/odf/element.py b/src/odf/element.py
index 66083632ce..5a3e2c8de6 100644
--- a/src/odf/element.py
+++ b/src/odf/element.py
@@ -22,7 +22,7 @@
 # Note: This script has copied a lot of text from xml.dom.minidom.
 # Whatever license applies to that file also applies to this file.
 #
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 import xml.dom
 from xml.dom.minicompat import defproperty, EmptyNodeList
 from .namespaces import nsdict
diff --git a/src/odf/elementtypes.py b/src/odf/elementtypes.py
index 36fbb592e8..f6997abe1e 100644
--- a/src/odf/elementtypes.py
+++ b/src/odf/elementtypes.py
@@ -19,7 +19,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import (
     ANIMNS, CHARTNS, DR3DNS, DRAWNS, FORMNS, MANIFESTNS, METANS, NUMBERNS, OFFICENS,
     PRESENTATIONNS, SCRIPTNS, STYLENS, SVGNS, TABLENS, TEXTNS
diff --git a/src/odf/form.py b/src/odf/form.py
index 98aada38f9..48544e61c8 100644
--- a/src/odf/form.py
+++ b/src/odf/form.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import FORMNS
 from .element import Element
 
diff --git a/src/odf/grammar.py b/src/odf/grammar.py
index 4548c529d2..d5c8b9b73f 100644
--- a/src/odf/grammar.py
+++ b/src/odf/grammar.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 __doc__=""" In principle the OpenDocument schema converted to python structures.
 Currently it contains the legal child elements of a given element.
 To be used for validation check in the API
diff --git a/src/odf/load.py b/src/odf/load.py
index f8551ae356..76c7920a0b 100644
--- a/src/odf/load.py
+++ b/src/odf/load.py
@@ -24,7 +24,7 @@
 # in memory. The user should then be able to make operations and then save
 # the structure again.
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from xml.sax import handler
 from .element import Element
 from .namespaces import OFFICENS
diff --git a/src/odf/manifest.py b/src/odf/manifest.py
index e1e8d450ef..6bfc946c77 100644
--- a/src/odf/manifest.py
+++ b/src/odf/manifest.py
@@ -20,7 +20,7 @@
 #
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import MANIFESTNS
 from .element import Element
 
diff --git a/src/odf/math.py b/src/odf/math.py
index 7f337633e7..98dd3f2ca0 100644
--- a/src/odf/math.py
+++ b/src/odf/math.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import MATHNS
 from .element import Element
 
diff --git a/src/odf/meta.py b/src/odf/meta.py
index 785055c782..1ab6bf1fa9 100644
--- a/src/odf/meta.py
+++ b/src/odf/meta.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import METANS
 from .element import Element
 
diff --git a/src/odf/namespaces.py b/src/odf/namespaces.py
index 0a2f003684..023359fccc 100644
--- a/src/odf/namespaces.py
+++ b/src/odf/namespaces.py
@@ -17,7 +17,7 @@
 #
 # Contributor(s):
 #
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 TOOLSVERSION = u"ODFPY/0.9.4dev"
 
 ANIMNS         = u"urn:oasis:names:tc:opendocument:xmlns:animation:1.0"
diff --git a/src/odf/number.py b/src/odf/number.py
index 238ba64385..0fe5a0b4aa 100644
--- a/src/odf/number.py
+++ b/src/odf/number.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import NUMBERNS
 from .element import Element
 from .style import StyleElement
diff --git a/src/odf/odf2moinmoin.py b/src/odf/odf2moinmoin.py
index 26e430eb76..39f7fb8b3a 100644
--- a/src/odf/odf2moinmoin.py
+++ b/src/odf/odf2moinmoin.py
@@ -20,7 +20,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 import zipfile, xml.dom.minidom
 from .namespaces import nsdict
 from .elementtypes import empty_elements, inline_elements
diff --git a/src/odf/odf2xhtml.py b/src/odf/odf2xhtml.py
index 15e1b86bf0..5669fa3feb 100644
--- a/src/odf/odf2xhtml.py
+++ b/src/odf/odf2xhtml.py
@@ -20,7 +20,7 @@
 #
 # import pdb
 # pdb.set_trace()
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from collections import defaultdict
 from xml.sax import handler
 from xml.sax.saxutils import escape, quoteattr
diff --git a/src/odf/odfmanifest.py b/src/odf/odfmanifest.py
index e96bef2695..91617627f9 100644
--- a/src/odf/odfmanifest.py
+++ b/src/odf/odfmanifest.py
@@ -20,7 +20,7 @@
 #
 
 # This script lists the content of the manifest.xml file
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 import zipfile
 from xml.sax import make_parser,handler
 from xml.sax.xmlreader import InputSource
diff --git a/src/odf/office.py b/src/odf/office.py
index 763da10fe5..6139870ac0 100644
--- a/src/odf/office.py
+++ b/src/odf/office.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import OFFICENS
 from .element import Element
 from .draw import StyleRefElement
diff --git a/src/odf/opendocument.py b/src/odf/opendocument.py
index d2704b69af..5508d99fdf 100644
--- a/src/odf/opendocument.py
+++ b/src/odf/opendocument.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 __doc__="""Use OpenDocument to generate your documents."""
 
 import mimetypes
diff --git a/src/odf/presentation.py b/src/odf/presentation.py
index de0bcc8ae5..24933d212f 100644
--- a/src/odf/presentation.py
+++ b/src/odf/presentation.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import PRESENTATIONNS
 from .element import Element
 
diff --git a/src/odf/script.py b/src/odf/script.py
index 3ac585cbee..09390c608d 100644
--- a/src/odf/script.py
+++ b/src/odf/script.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import SCRIPTNS
 from .element import Element
 
diff --git a/src/odf/style.py b/src/odf/style.py
index 626a716483..912676c9ac 100644
--- a/src/odf/style.py
+++ b/src/odf/style.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import STYLENS
 from .element import Element
 
diff --git a/src/odf/svg.py b/src/odf/svg.py
index ba9b81ccc7..92aa8d2885 100644
--- a/src/odf/svg.py
+++ b/src/odf/svg.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import SVGNS
 from .element import Element
 from .draw import DrawElement
diff --git a/src/odf/table.py b/src/odf/table.py
index 579e9556af..3769e80201 100644
--- a/src/odf/table.py
+++ b/src/odf/table.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import TABLENS
 from .element import Element
 
diff --git a/src/odf/teletype.py b/src/odf/teletype.py
index e4ed44d120..8df8efe17b 100644
--- a/src/odf/teletype.py
+++ b/src/odf/teletype.py
@@ -27,7 +27,7 @@ the appropriate <text:s>, <text:tab>, or <text:line-break>
 elements.  This module takes care of that problem.
 """
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .element import Node
 from .text import S,LineBreak,Tab
 
diff --git a/src/odf/text.py b/src/odf/text.py
index e31e3b0a74..c1f6b3b8f7 100644
--- a/src/odf/text.py
+++ b/src/odf/text.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import TEXTNS
 from .element import Element
 from .style import StyleElement
diff --git a/src/odf/thumbnail.py b/src/odf/thumbnail.py
index 7e7fe38a0e..78f78b90f3 100644
--- a/src/odf/thumbnail.py
+++ b/src/odf/thumbnail.py
@@ -3,7 +3,6 @@
 # This contains a 128x128 px thumbnail in PNG format
 # Taken from https://cgit.freedesktop.org/libreoffice/core/tree/sysui/desktop/icons/hicolor/128x128/apps/main.png
 # License: GPL-3
-from __future__ import print_function, unicode_literals, absolute_import, division
 import base64
 
 iconstr = b"""
diff --git a/src/odf/userfield.py b/src/odf/userfield.py
index 9d72ffc72f..43ffc3eb4e 100644
--- a/src/odf/userfield.py
+++ b/src/odf/userfield.py
@@ -21,7 +21,7 @@
 
 """Class to show and manipulate user fields in odf documents."""
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 import sys
 import zipfile
 
diff --git a/src/odf/xforms.py b/src/odf/xforms.py
index 2e091be8f4..fe6de37467 100644
--- a/src/odf/xforms.py
+++ b/src/odf/xforms.py
@@ -18,7 +18,7 @@
 # Contributor(s):
 #
 
-from __future__ import print_function, unicode_literals, absolute_import, division
+
 from .namespaces import XFORMSNS
 from .element import Element
 
diff --git a/src/polyglot/binary.py b/src/polyglot/binary.py
index 88c2d67f0a..6cf64a5ab3 100644
--- a/src/polyglot/binary.py
+++ b/src/polyglot/binary.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from base64 import standard_b64decode, standard_b64encode
 from binascii import hexlify, unhexlify
diff --git a/src/polyglot/builtins.py b/src/polyglot/builtins.py
index 0fa366d8b9..66f8f2827a 100644
--- a/src/polyglot/builtins.py
+++ b/src/polyglot/builtins.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import os
 import sys
diff --git a/src/polyglot/functools.py b/src/polyglot/functools.py
index 599e6b38b7..68c5abe672 100644
--- a/src/polyglot/functools.py
+++ b/src/polyglot/functools.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import is_py3
 if is_py3:
diff --git a/src/polyglot/http_server.py b/src/polyglot/http_server.py
index 10dbbc0a20..544c86a065 100644
--- a/src/polyglot/http_server.py
+++ b/src/polyglot/http_server.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import is_py3
 
diff --git a/src/polyglot/io.py b/src/polyglot/io.py
index ba49423d54..8d0df2725c 100644
--- a/src/polyglot/io.py
+++ b/src/polyglot/io.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from io import StringIO, BytesIO
 
diff --git a/src/polyglot/plistlib.py b/src/polyglot/plistlib.py
index 5066f1f952..c4a38f9f20 100644
--- a/src/polyglot/plistlib.py
+++ b/src/polyglot/plistlib.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 from polyglot.builtins import is_py3
 
diff --git a/src/polyglot/smtplib.py b/src/polyglot/smtplib.py
index 11bf5d76fc..cff16f9cf8 100644
--- a/src/polyglot/smtplib.py
+++ b/src/polyglot/smtplib.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 import sys
 from functools import partial
diff --git a/src/polyglot/urllib.py b/src/polyglot/urllib.py
index cfd7ab4ab1..08684dd17b 100644
--- a/src/polyglot/urllib.py
+++ b/src/polyglot/urllib.py
@@ -2,7 +2,7 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-from __future__ import absolute_import
+
 
 from polyglot.builtins import is_py3
 
diff --git a/src/tinycss/color3.py b/src/tinycss/color3.py
index e0cb0bda48..3dd9be8619 100644
--- a/src/tinycss/color3.py
+++ b/src/tinycss/color3.py
@@ -13,7 +13,7 @@
     :license: BSD, see LICENSE for more details.
 """
 
-from __future__ import unicode_literals, division
+
 import collections
 import itertools
 import re
diff --git a/src/tinycss/css21.py b/src/tinycss/css21.py
index 2f1d3f85bb..22c9271cf2 100644
--- a/src/tinycss/css21.py
+++ b/src/tinycss/css21.py
@@ -10,7 +10,7 @@
     :license: BSD, see LICENSE for more details.
 """
 
-from __future__ import unicode_literals
+
 from itertools import chain, islice
 
 from tinycss.decoding import decode
diff --git a/src/tinycss/decoding.py b/src/tinycss/decoding.py
index 32e1799c48..a2a12ec4b3 100644
--- a/src/tinycss/decoding.py
+++ b/src/tinycss/decoding.py
@@ -10,7 +10,7 @@
     :license: BSD, see LICENSE for more details.
 """
 
-from __future__ import unicode_literals
+
 
 import operator
 import re
diff --git a/src/tinycss/fonts3.py b/src/tinycss/fonts3.py
index 66d65db0b6..2937a580e3 100644
--- a/src/tinycss/fonts3.py
+++ b/src/tinycss/fonts3.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/media3.py b/src/tinycss/media3.py
index daa8e3a9d3..8a6081ba5e 100644
--- a/src/tinycss/media3.py
+++ b/src/tinycss/media3.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/page3.py b/src/tinycss/page3.py
index 8a4e150e24..7e5bb075be 100644
--- a/src/tinycss/page3.py
+++ b/src/tinycss/page3.py
@@ -12,7 +12,7 @@
     :license: BSD, see LICENSE for more details.
 """
 
-from __future__ import unicode_literals, division
+
 from .css21 import CSS21Parser, ParseError
 
 
diff --git a/src/tinycss/parsing.py b/src/tinycss/parsing.py
index 86e93c07f7..7daf4c78d2 100644
--- a/src/tinycss/parsing.py
+++ b/src/tinycss/parsing.py
@@ -9,7 +9,7 @@
     :license: BSD, see LICENSE for more details.
 """
 
-from __future__ import unicode_literals
+
 
 
 # TODO: unit tests
diff --git a/src/tinycss/tests/__init__.py b/src/tinycss/tests/__init__.py
index 01b4731e70..9a5f58fb96 100644
--- a/src/tinycss/tests/__init__.py
+++ b/src/tinycss/tests/__init__.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/tests/color3.py b/src/tinycss/tests/color3.py
index 03cde0cf00..81bc669dc1 100644
--- a/src/tinycss/tests/color3.py
+++ b/src/tinycss/tests/color3.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/tests/css21.py b/src/tinycss/tests/css21.py
index e92b76880b..a570b26fcf 100644
--- a/src/tinycss/tests/css21.py
+++ b/src/tinycss/tests/css21.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/tests/decoding.py b/src/tinycss/tests/decoding.py
index d465118d30..3ae4e5e156 100644
--- a/src/tinycss/tests/decoding.py
+++ b/src/tinycss/tests/decoding.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/tests/fonts3.py b/src/tinycss/tests/fonts3.py
index a5dd938116..8f220c961f 100644
--- a/src/tinycss/tests/fonts3.py
+++ b/src/tinycss/tests/fonts3.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/tests/main.py b/src/tinycss/tests/main.py
index 97d7c05796..3bef849f33 100644
--- a/src/tinycss/tests/main.py
+++ b/src/tinycss/tests/main.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/tests/media3.py b/src/tinycss/tests/media3.py
index 6b53ff204f..af200f2492 100644
--- a/src/tinycss/tests/media3.py
+++ b/src/tinycss/tests/media3.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/tests/page3.py b/src/tinycss/tests/page3.py
index b3d7665643..2387445a67 100644
--- a/src/tinycss/tests/page3.py
+++ b/src/tinycss/tests/page3.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/tests/tokenizing.py b/src/tinycss/tests/tokenizing.py
index b781b22e00..1b31ee39d3 100644
--- a/src/tinycss/tests/tokenizing.py
+++ b/src/tinycss/tests/tokenizing.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 # vim:fileencoding=utf-8
-from __future__ import absolute_import, division, print_function, unicode_literals
+
 
 __license__ = 'GPL v3'
 __copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'
diff --git a/src/tinycss/token_data.py b/src/tinycss/token_data.py
index dfbafc1781..5f1aefe486 100644
--- a/src/tinycss/token_data.py
+++ b/src/tinycss/token_data.py
@@ -9,7 +9,7 @@
     :license: BSD, see LICENSE for more details.
 """
 
-from __future__ import unicode_literals
+
 
 import re
 import sys
diff --git a/src/tinycss/tokenizer.py b/src/tinycss/tokenizer.py
index 154c111e20..4aaf32ce3a 100644
--- a/src/tinycss/tokenizer.py
+++ b/src/tinycss/tokenizer.py
@@ -12,7 +12,7 @@
     :license: BSD, see LICENSE for more details.
 """
 
-from __future__ import unicode_literals
+
 
 from tinycss import token_data