diff --git a/bypy/macos/__main__.py b/bypy/macos/__main__.py
index 4f8b621b5d..f68d74622e 100644
--- a/bypy/macos/__main__.py
+++ b/bypy/macos/__main__.py
@@ -2,8 +2,6 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
-
-
 import errno
 import glob
 import json
@@ -504,7 +502,7 @@ class Freeze(object):
         for x in (
                 'usb-1.0.0', 'mtp.9', 'chm.0', 'sqlite3.0', 'hunspell-1.7.0',
                 'icudata.64', 'icui18n.64', 'icuio.64', 'icuuc.64', 'hyphen.0',
-                'xslt.1', 'exslt.0', 'xml2.2', 'z.1', 'unrar',
+                'xslt.1', 'exslt.0', 'xml2.2', 'z.1', 'unrar', 'lzma.5',
                 'crypto.1.0.0', 'ssl.1.0.0', 'iconv.2',  # 'ltdl.7'
         ):
             print('\nAdding', x)
diff --git a/bypy/windows/__main__.py b/bypy/windows/__main__.py
index e0032c8670..07cfcfaacc 100644
--- a/bypy/windows/__main__.py
+++ b/bypy/windows/__main__.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import errno
 import glob
 import os
diff --git a/manual/plugin_examples/webengine_demo/__init__.py b/manual/plugin_examples/webengine_demo/__init__.py
index 1270276351..7d8b4fdcc1 100644
--- a/manual/plugin_examples/webengine_demo/__init__.py
+++ b/manual/plugin_examples/webengine_demo/__init__.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 # The class that all Interface Action plugin wrappers must inherit from
 from calibre.customize import InterfaceActionBase
 
diff --git a/manual/plugin_examples/webengine_demo/main.py b/manual/plugin_examples/webengine_demo/main.py
index 42fe1faad7..6a3c85485b 100644
--- a/manual/plugin_examples/webengine_demo/main.py
+++ b/manual/plugin_examples/webengine_demo/main.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import QUrl
 from PyQt5.QtWebEngineWidgets import QWebEngineView
 
diff --git a/setup/browser_data.py b/setup/browser_data.py
index 6882649511..7646ea9da2 100644
--- a/setup/browser_data.py
+++ b/setup/browser_data.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import json
 import gzip
diff --git a/setup/git_version.py b/setup/git_version.py
index 787bfd5bee..21ceebfdb7 100755
--- a/setup/git_version.py
+++ b/setup/git_version.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2019, Eli Schwartz <eschwartz@archlinux.org>
 
 
-
 import re
 import subprocess
 
diff --git a/setup/install.py b/setup/install.py
index 15f1d47665..72d6a1849a 100644
--- a/setup/install.py
+++ b/setup/install.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2009, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import atexit
 import glob
 import os
diff --git a/setup/port.py b/setup/port.py
index 8ee737d914..80f408cbd0 100644
--- a/setup/port.py
+++ b/setup/port.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import errno
 import hashlib
 import json
diff --git a/setup/publish.py b/setup/publish.py
index f9b8e381f3..9d8ea0f713 100644
--- a/setup/publish.py
+++ b/setup/publish.py
@@ -2,7 +2,6 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
 
-
 __license__ = 'GPL v3'
 __copyright__ = '2009, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/setup/test.py b/setup/test.py
index d333f2e06c..7f75840df1 100644
--- a/setup/test.py
+++ b/setup/test.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import unittest
 
diff --git a/setup/unix-ci.py b/setup/unix-ci.py
index 1c4631c54b..07bc4fca2a 100644
--- a/setup/unix-ci.py
+++ b/setup/unix-ci.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import shlex
 import subprocess
diff --git a/setup/win-ci.py b/setup/win-ci.py
index d97f584706..343f132384 100644
--- a/setup/win-ci.py
+++ b/setup/win-ci.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import io
 import os
 import subprocess
diff --git a/src/calibre/db/cli/__init__.py b/src/calibre/db/cli/__init__.py
index 45ef2b323c..3a8e513f2e 100644
--- a/src/calibre/db/cli/__init__.py
+++ b/src/calibre/db/cli/__init__.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import importlib
 
 
diff --git a/src/calibre/db/cli/cmd_add.py b/src/calibre/db/cli/cmd_add.py
index 6c13802b7a..ce95a751a1 100644
--- a/src/calibre/db/cli/cmd_add.py
+++ b/src/calibre/db/cli/cmd_add.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import sys
 from contextlib import contextmanager
diff --git a/src/calibre/db/cli/cmd_add_custom_column.py b/src/calibre/db/cli/cmd_add_custom_column.py
index ca217d8607..a1ce639b9c 100644
--- a/src/calibre/db/cli/cmd_add_custom_column.py
+++ b/src/calibre/db/cli/cmd_add_custom_column.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 
 from calibre import prints
diff --git a/src/calibre/db/cli/cmd_add_format.py b/src/calibre/db/cli/cmd_add_format.py
index 39408b03ee..d0b25254a3 100644
--- a/src/calibre/db/cli/cmd_add_format.py
+++ b/src/calibre/db/cli/cmd_add_format.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 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 a961d5bc6e..2edbbd55b4 100644
--- a/src/calibre/db/cli/cmd_backup_metadata.py
+++ b/src/calibre/db/cli/cmd_backup_metadata.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre import prints
 
 readonly = True
diff --git a/src/calibre/db/cli/cmd_catalog.py b/src/calibre/db/cli/cmd_catalog.py
index c4b7456681..128ed9e7da 100644
--- a/src/calibre/db/cli/cmd_catalog.py
+++ b/src/calibre/db/cli/cmd_catalog.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 
 from calibre.customize.ui import available_catalog_formats, plugin_for_catalog_format
diff --git a/src/calibre/db/cli/cmd_check_library.py b/src/calibre/db/cli/cmd_check_library.py
index 29a08b0755..895870b7e4 100644
--- a/src/calibre/db/cli/cmd_check_library.py
+++ b/src/calibre/db/cli/cmd_check_library.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import csv
 import sys
 
diff --git a/src/calibre/db/cli/cmd_clone.py b/src/calibre/db/cli/cmd_clone.py
index 3d66fa5710..f6f5c7c9bd 100644
--- a/src/calibre/db/cli/cmd_clone.py
+++ b/src/calibre/db/cli/cmd_clone.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 
 from calibre import patheq
diff --git a/src/calibre/db/cli/cmd_custom_columns.py b/src/calibre/db/cli/cmd_custom_columns.py
index adeb142028..115b6733fc 100644
--- a/src/calibre/db/cli/cmd_custom_columns.py
+++ b/src/calibre/db/cli/cmd_custom_columns.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from pprint import pformat
 
 from calibre import prints
diff --git a/src/calibre/db/cli/cmd_embed_metadata.py b/src/calibre/db/cli/cmd_embed_metadata.py
index fc5378a483..c0aab6378c 100644
--- a/src/calibre/db/cli/cmd_embed_metadata.py
+++ b/src/calibre/db/cli/cmd_embed_metadata.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre import prints
 from calibre.db.cli import integers_from_string
 from calibre.srv.changes import formats_added
diff --git a/src/calibre/db/cli/cmd_export.py b/src/calibre/db/cli/cmd_export.py
index b0a778e270..4630291fe5 100644
--- a/src/calibre/db/cli/cmd_export.py
+++ b/src/calibre/db/cli/cmd_export.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 
 from calibre.db.cli import integers_from_string
diff --git a/src/calibre/db/cli/cmd_list.py b/src/calibre/db/cli/cmd_list.py
index 79655632c8..1fde960b7a 100644
--- a/src/calibre/db/cli/cmd_list.py
+++ b/src/calibre/db/cli/cmd_list.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 import os
 import sys
diff --git a/src/calibre/db/cli/cmd_list_categories.py b/src/calibre/db/cli/cmd_list_categories.py
index 6ba23754d5..da94ef0fe9 100644
--- a/src/calibre/db/cli/cmd_list_categories.py
+++ b/src/calibre/db/cli/cmd_list_categories.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import csv
 import sys
 from textwrap import TextWrapper
diff --git a/src/calibre/db/cli/cmd_remove.py b/src/calibre/db/cli/cmd_remove.py
index 01daf54b63..f60e8ee031 100644
--- a/src/calibre/db/cli/cmd_remove.py
+++ b/src/calibre/db/cli/cmd_remove.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre.db.cli import integers_from_string
 from calibre.db.delete_service import delete_service
 from calibre.srv.changes import books_deleted
diff --git a/src/calibre/db/cli/cmd_remove_custom_column.py b/src/calibre/db/cli/cmd_remove_custom_column.py
index 534ba204f5..dbbf18a7af 100644
--- a/src/calibre/db/cli/cmd_remove_custom_column.py
+++ b/src/calibre/db/cli/cmd_remove_custom_column.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import sys
 from calibre import prints
 from calibre.db.legacy import LibraryDatabase
diff --git a/src/calibre/db/cli/cmd_remove_format.py b/src/calibre/db/cli/cmd_remove_format.py
index b360e2f43c..afe75c6b79 100644
--- a/src/calibre/db/cli/cmd_remove_format.py
+++ b/src/calibre/db/cli/cmd_remove_format.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 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 c2d854cc81..a07aa16222 100644
--- a/src/calibre/db/cli/cmd_restore_database.py
+++ b/src/calibre/db/cli/cmd_restore_database.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 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 b8360f3e38..6008fac18e 100644
--- a/src/calibre/db/cli/cmd_saved_searches.py
+++ b/src/calibre/db/cli/cmd_saved_searches.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 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 31a46f3630..e386077b9a 100644
--- a/src/calibre/db/cli/cmd_search.py
+++ b/src/calibre/db/cli/cmd_search.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre import prints
 
 readonly = True
diff --git a/src/calibre/db/cli/cmd_set_custom.py b/src/calibre/db/cli/cmd_set_custom.py
index 4c184c4697..b40fb887bf 100644
--- a/src/calibre/db/cli/cmd_set_custom.py
+++ b/src/calibre/db/cli/cmd_set_custom.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre import prints
 from calibre.db import _get_series_values
 from calibre.srv.changes import metadata
diff --git a/src/calibre/db/cli/cmd_set_metadata.py b/src/calibre/db/cli/cmd_set_metadata.py
index b48f153039..6e90d2d10b 100644
--- a/src/calibre/db/cli/cmd_set_metadata.py
+++ b/src/calibre/db/cli/cmd_set_metadata.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 
 from calibre import prints
diff --git a/src/calibre/db/cli/cmd_show_metadata.py b/src/calibre/db/cli/cmd_show_metadata.py
index 36177639c8..e9743efd2f 100644
--- a/src/calibre/db/cli/cmd_show_metadata.py
+++ b/src/calibre/db/cli/cmd_show_metadata.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import sys
 
 from calibre import prints
diff --git a/src/calibre/db/cli/utils.py b/src/calibre/db/cli/utils.py
index 2825a5dff0..175cd7582f 100644
--- a/src/calibre/db/cli/utils.py
+++ b/src/calibre/db/cli/utils.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from polyglot.builtins import map
 
 import unicodedata
diff --git a/src/calibre/db/copy_to_library.py b/src/calibre/db/copy_to_library.py
index caeb86bc9d..9a9adeaed9 100644
--- a/src/calibre/db/copy_to_library.py
+++ b/src/calibre/db/copy_to_library.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre.db.utils import find_identical_books
 from calibre.utils.config import tweaks
 from calibre.utils.date import now
diff --git a/src/calibre/db/restore.py b/src/calibre/db/restore.py
index 0840bb0470..d44f220e41 100644
--- a/src/calibre/db/restore.py
+++ b/src/calibre/db/restore.py
@@ -2,7 +2,6 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
 
-
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/devices/cli.py b/src/calibre/devices/cli.py
index 1d8b465b5c..20201d4f6d 100755
--- a/src/calibre/devices/cli.py
+++ b/src/calibre/devices/cli.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 
-
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal <kovid at kovidgoyal.net>'
 """
diff --git a/src/calibre/devices/kindle/bookmark.py b/src/calibre/devices/kindle/bookmark.py
index 2537906773..5d690f170e 100644
--- a/src/calibre/devices/kindle/bookmark.py
+++ b/src/calibre/devices/kindle/bookmark.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__   = 'GPL v3'
 __docformat__ = 'restructuredtext en'
 
diff --git a/src/calibre/devices/kobo/__init__.py b/src/calibre/devices/kobo/__init__.py
index b09471af7e..c227aeaca5 100644
--- a/src/calibre/devices/kobo/__init__.py
+++ b/src/calibre/devices/kobo/__init__.py
@@ -2,7 +2,6 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
 
-
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/devices/smart_device_app/__init__.py b/src/calibre/devices/smart_device_app/__init__.py
index b09471af7e..c227aeaca5 100644
--- a/src/calibre/devices/smart_device_app/__init__.py
+++ b/src/calibre/devices/smart_device_app/__init__.py
@@ -2,7 +2,6 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
 
-
 __license__   = 'GPL v3'
 __copyright__ = '2010, Kovid Goyal <kovid@kovidgoyal.net>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/devices/usbms/books.py b/src/calibre/devices/usbms/books.py
index 692190c1b6..4f530f38cf 100644
--- a/src/calibre/devices/usbms/books.py
+++ b/src/calibre/devices/usbms/books.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2009, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/devices/winusb.py b/src/calibre/devices/winusb.py
index 207507d323..740b51f924 100644
--- a/src/calibre/devices/winusb.py
+++ b/src/calibre/devices/winusb.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os, string, re, sys
 from collections import namedtuple, defaultdict
 from operator import itemgetter
diff --git a/src/calibre/ebooks/BeautifulSoup.py b/src/calibre/ebooks/BeautifulSoup.py
index ed0a43b4f1..ac445ad6b6 100644
--- a/src/calibre/ebooks/BeautifulSoup.py
+++ b/src/calibre/ebooks/BeautifulSoup.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import bs4
 from bs4 import (  # noqa
     CData, Comment, Declaration, NavigableString, ProcessingInstruction,
diff --git a/src/calibre/ebooks/conversion/plugins/djvu_input.py b/src/calibre/ebooks/conversion/plugins/djvu_input.py
index d9d22cf6b9..f3f0b132f2 100644
--- a/src/calibre/ebooks/conversion/plugins/djvu_input.py
+++ b/src/calibre/ebooks/conversion/plugins/djvu_input.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, Anthon van der Neut <anthon@mnt.org>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/conversion/plugins/htmlz_input.py b/src/calibre/ebooks/conversion/plugins/htmlz_input.py
index 05c6f52faa..b773b925ee 100644
--- a/src/calibre/ebooks/conversion/plugins/htmlz_input.py
+++ b/src/calibre/ebooks/conversion/plugins/htmlz_input.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/conversion/plugins/htmlz_output.py b/src/calibre/ebooks/conversion/plugins/htmlz_output.py
index ee63954dd8..88b9f6b1e8 100644
--- a/src/calibre/ebooks/conversion/plugins/htmlz_output.py
+++ b/src/calibre/ebooks/conversion/plugins/htmlz_output.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/conversion/search_replace.py b/src/calibre/ebooks/conversion/search_replace.py
index f7226fa2a2..62d180cc26 100644
--- a/src/calibre/ebooks/conversion/search_replace.py
+++ b/src/calibre/ebooks/conversion/search_replace.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import regex
 
 REGEX_FLAGS = regex.VERSION1 | regex.WORD | regex.FULLCASE | regex.MULTILINE | regex.UNICODE
diff --git a/src/calibre/ebooks/epub/pages.py b/src/calibre/ebooks/epub/pages.py
index d1eb64d90e..ed824d0a44 100644
--- a/src/calibre/ebooks/epub/pages.py
+++ b/src/calibre/ebooks/epub/pages.py
@@ -3,7 +3,6 @@ Add page mapping information to an EPUB book.
 '''
 
 
-
 __license__   = 'GPL v3'
 __copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/htmlz/oeb2html.py b/src/calibre/ebooks/htmlz/oeb2html.py
index 71bbafc41d..0fcf6a67d4 100644
--- a/src/calibre/ebooks/htmlz/oeb2html.py
+++ b/src/calibre/ebooks/htmlz/oeb2html.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/lrf/pylrs/pylrfopt.py b/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
index 1ddf80d556..00167e8c2d 100644
--- a/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
+++ b/src/calibre/ebooks/lrf/pylrs/pylrfopt.py
@@ -1,6 +1,5 @@
 
 
-
 def _optimize(tagList, tagName, conversion):
     # copy the tag of interest plus any text
     newTagList = []
diff --git a/src/calibre/ebooks/metadata/book/serialize.py b/src/calibre/ebooks/metadata/book/serialize.py
index 12a76c18dc..48f54d9fa5 100644
--- a/src/calibre/ebooks/metadata/book/serialize.py
+++ b/src/calibre/ebooks/metadata/book/serialize.py
@@ -3,8 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
-
 from calibre.constants import preferred_encoding
 from calibre.ebooks.metadata.book import SERIALIZABLE_FIELDS
 from calibre.ebooks.metadata.book.base import Metadata
diff --git a/src/calibre/ebooks/metadata/kfx.py b/src/calibre/ebooks/metadata/kfx.py
index 7de15265af..4029814071 100644
--- a/src/calibre/ebooks/metadata/kfx.py
+++ b/src/calibre/ebooks/metadata/kfx.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>, John Howell <jhowell@acm.org>'
 
 
-
 # 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/opf.py b/src/calibre/ebooks/metadata/opf.py
index 081af8f140..2d9abdd0ec 100644
--- a/src/calibre/ebooks/metadata/opf.py
+++ b/src/calibre/ebooks/metadata/opf.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from lxml import etree
 
 from calibre.ebooks.metadata.opf2 import OPF, pretty_print
diff --git a/src/calibre/ebooks/metadata/opf3.py b/src/calibre/ebooks/metadata/opf3.py
index 4cad46c7af..dc1529f3f0 100644
--- a/src/calibre/ebooks/metadata/opf3.py
+++ b/src/calibre/ebooks/metadata/opf3.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 import re
 from collections import defaultdict, namedtuple
diff --git a/src/calibre/ebooks/metadata/opf_2_to_3.py b/src/calibre/ebooks/metadata/opf_2_to_3.py
index 601effd9f5..5dcf0df419 100644
--- a/src/calibre/ebooks/metadata/opf_2_to_3.py
+++ b/src/calibre/ebooks/metadata/opf_2_to_3.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from lxml import etree
 
 from calibre.ebooks.metadata.opf3 import (
diff --git a/src/calibre/ebooks/metadata/plucker.py b/src/calibre/ebooks/metadata/plucker.py
index 3fe3b0e6ff..89deaa40a6 100644
--- a/src/calibre/ebooks/metadata/plucker.py
+++ b/src/calibre/ebooks/metadata/plucker.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 '''
 Read meta information from Plucker pdb files.
 '''
diff --git a/src/calibre/ebooks/metadata/search_internet.py b/src/calibre/ebooks/metadata/search_internet.py
index 6a46b0daf9..0b2d553cd4 100644
--- a/src/calibre/ebooks/metadata/search_internet.py
+++ b/src/calibre/ebooks/metadata/search_internet.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 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 fee88a0d3b..b17a689bd2 100644
--- a/src/calibre/ebooks/metadata/snb.py
+++ b/src/calibre/ebooks/metadata/snb.py
@@ -1,7 +1,6 @@
 '''Read meta information from SNB files'''
 
 
-
 __license__   = 'GPL v3'
 __copyright__ = '2010, Li Fanxi <lifanxi@freemindworld.com>'
 
diff --git a/src/calibre/ebooks/oeb/polish/download.py b/src/calibre/ebooks/oeb/polish/download.py
index fa5891fbd1..e2c5627698 100644
--- a/src/calibre/ebooks/oeb/polish/download.py
+++ b/src/calibre/ebooks/oeb/polish/download.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import cgi
 import mimetypes
 import os
diff --git a/src/calibre/ebooks/oeb/polish/upgrade.py b/src/calibre/ebooks/oeb/polish/upgrade.py
index 0385bed485..e98a8d8471 100644
--- a/src/calibre/ebooks/oeb/polish/upgrade.py
+++ b/src/calibre/ebooks/oeb/polish/upgrade.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import sys
 
 from calibre.ebooks.metadata.opf_2_to_3 import upgrade_metadata
diff --git a/src/calibre/ebooks/oeb/transforms/unsmarten.py b/src/calibre/ebooks/oeb/transforms/unsmarten.py
index e247309df2..ea7d40c846 100644
--- a/src/calibre/ebooks/oeb/transforms/unsmarten.py
+++ b/src/calibre/ebooks/oeb/transforms/unsmarten.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/pdb/ereader/reader202.py b/src/calibre/ebooks/pdb/ereader/reader202.py
index a970d15c8a..63c5f73aa7 100644
--- a/src/calibre/ebooks/pdb/ereader/reader202.py
+++ b/src/calibre/ebooks/pdb/ereader/reader202.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 '''
 Read content from ereader pdb file with a 116 and 202 byte header created by Makebook.
 '''
diff --git a/src/calibre/ebooks/pdb/header.py b/src/calibre/ebooks/pdb/header.py
index 8194175f95..ab3fb04b30 100644
--- a/src/calibre/ebooks/pdb/header.py
+++ b/src/calibre/ebooks/pdb/header.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 '''
 Read the header data from a pdb file.
 '''
diff --git a/src/calibre/ebooks/pdb/plucker/reader.py b/src/calibre/ebooks/pdb/plucker/reader.py
index b92dd6a8e2..d23e362066 100644
--- a/src/calibre/ebooks/pdb/plucker/reader.py
+++ b/src/calibre/ebooks/pdb/plucker/reader.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__   = 'GPL v3'
 __copyright__ = '20011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/ebooks/pdf/develop.py b/src/calibre/ebooks/pdf/develop.py
index 67ad81f2c9..eaae643668 100644
--- a/src/calibre/ebooks/pdf/develop.py
+++ b/src/calibre/ebooks/pdf/develop.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import sys
 
 from PyQt5.Qt import QApplication, QUrl, QPageLayout, QPageSize, QMarginsF
diff --git a/src/calibre/ebooks/pdf/image_writer.py b/src/calibre/ebooks/pdf/image_writer.py
index 51bb7439c1..5632252672 100644
--- a/src/calibre/ebooks/pdf/image_writer.py
+++ b/src/calibre/ebooks/pdf/image_writer.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import QMarginsF, QPageLayout, QPageSize, QSize
 
 from calibre.constants import filesystem_encoding
diff --git a/src/calibre/ebooks/pdf/test_html_writer.py b/src/calibre/ebooks/pdf/test_html_writer.py
index 4527f0295d..251dd7f5d9 100644
--- a/src/calibre/ebooks/pdf/test_html_writer.py
+++ b/src/calibre/ebooks/pdf/test_html_writer.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import unittest
 from .html_writer import merge_w_arrays, merge_cmaps
 
diff --git a/src/calibre/ebooks/readability/debug.py b/src/calibre/ebooks/readability/debug.py
index 1a74948ba5..bc51815909 100644
--- a/src/calibre/ebooks/readability/debug.py
+++ b/src/calibre/ebooks/readability/debug.py
@@ -1,6 +1,5 @@
 
 
-
 def save_to_file(text, filename):
     with open(filename, 'wb') as f:
         f.write(b'<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />')
diff --git a/src/calibre/ebooks/render_html.py b/src/calibre/ebooks/render_html.py
index 4b6858d950..f18eb3caab 100644
--- a/src/calibre/ebooks/render_html.py
+++ b/src/calibre/ebooks/render_html.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import sys
 
diff --git a/src/calibre/gui2/actions/author_mapper.py b/src/calibre/gui2/actions/author_mapper.py
index 8fd4c658bf..9e7443f4ea 100644
--- a/src/calibre/gui2/actions/author_mapper.py
+++ b/src/calibre/gui2/actions/author_mapper.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre.gui2 import gprefs
 from calibre.gui2.actions import InterfaceAction
 from polyglot.builtins import iteritems, map, range
diff --git a/src/calibre/gui2/actions/store.py b/src/calibre/gui2/actions/store.py
index 5d4681b5e5..a10deba24c 100644
--- a/src/calibre/gui2/actions/store.py
+++ b/src/calibre/gui2/actions/store.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/actions/virtual_library.py b/src/calibre/gui2/actions/virtual_library.py
index c17b08b49e..517cbf70a2 100644
--- a/src/calibre/gui2/actions/virtual_library.py
+++ b/src/calibre/gui2/actions/virtual_library.py
@@ -2,8 +2,6 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
-
-
 from PyQt5.Qt import QToolButton, QAction
 
 from calibre.gui2.actions import InterfaceAction
diff --git a/src/calibre/gui2/add_filters.py b/src/calibre/gui2/add_filters.py
index 06bbea5e42..9be6a323b7 100644
--- a/src/calibre/gui2/add_filters.py
+++ b/src/calibre/gui2/add_filters.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 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 0d5a436814..322cc415b3 100644
--- a/src/calibre/gui2/author_mapper.py
+++ b/src/calibre/gui2/author_mapper.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from collections import OrderedDict
 
 from calibre.ebooks.metadata import authors_to_string, string_to_authors
diff --git a/src/calibre/gui2/changes.py b/src/calibre/gui2/changes.py
index 6a49327eda..29f05f8800 100644
--- a/src/calibre/gui2/changes.py
+++ b/src/calibre/gui2/changes.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre.srv.changes import (
     BooksAdded, BooksDeleted, FormatsAdded, FormatsRemoved, MetadataChanged,
     SavedSearchesChanged
diff --git a/src/calibre/gui2/convert/single.py b/src/calibre/gui2/convert/single.py
index 6d0d5240a6..bba385a0b9 100644
--- a/src/calibre/gui2/convert/single.py
+++ b/src/calibre/gui2/convert/single.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2009, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import shutil
 
 from PyQt5.Qt import (
diff --git a/src/calibre/gui2/css_transform_rules.py b/src/calibre/gui2/css_transform_rules.py
index 1c461422cd..7ea9923371 100644
--- a/src/calibre/gui2/css_transform_rules.py
+++ b/src/calibre/gui2/css_transform_rules.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import (
     QWidget, QVBoxLayout, QHBoxLayout, QLabel, QComboBox, QLineEdit,
     QPushButton, QSize, pyqtSignal, QMenu
diff --git a/src/calibre/gui2/dialogs/choose_plugin_toolbars.py b/src/calibre/gui2/dialogs/choose_plugin_toolbars.py
index 12dea16a91..f9f49407d7 100644
--- a/src/calibre/gui2/dialogs/choose_plugin_toolbars.py
+++ b/src/calibre/gui2/dialogs/choose_plugin_toolbars.py
@@ -2,7 +2,6 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
 
-
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
 __license__   = 'GPL v3'
diff --git a/src/calibre/gui2/dialogs/restore_library.py b/src/calibre/gui2/dialogs/restore_library.py
index f4353fe4a2..52a6d8ecd9 100644
--- a/src/calibre/gui2/dialogs/restore_library.py
+++ b/src/calibre/gui2/dialogs/restore_library.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2011, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 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 efaa255692..e3924c71fd 100644
--- a/src/calibre/gui2/dialogs/saved_search_editor.py
+++ b/src/calibre/gui2/dialogs/saved_search_editor.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2008, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import (
     QFormLayout, QIcon, QLabel, QLineEdit, QListWidget, Qt, QVBoxLayout
 )
diff --git a/src/calibre/gui2/ebook_download.py b/src/calibre/gui2/ebook_download.py
index eb6acc31af..c0a23b8fd1 100644
--- a/src/calibre/gui2/ebook_download.py
+++ b/src/calibre/gui2/ebook_download.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/layout_menu.py b/src/calibre/gui2/layout_menu.py
index c0319384b6..03f43e5ac8 100644
--- a/src/calibre/gui2/layout_menu.py
+++ b/src/calibre/gui2/layout_menu.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import (
     QFontMetrics, QHBoxLayout, QIcon, QMenu, QPainter, QPushButton, QSize,
     QSizePolicy, Qt, QWidget, QStyleOption, QStyle)
diff --git a/src/calibre/gui2/pin_columns.py b/src/calibre/gui2/pin_columns.py
index 33e11d599e..579c88fce0 100644
--- a/src/calibre/gui2/pin_columns.py
+++ b/src/calibre/gui2/pin_columns.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import QSplitter, QTableView
 
 from calibre.gui2.library import DEFAULT_SORT
diff --git a/src/calibre/gui2/preferences/emailp.py b/src/calibre/gui2/preferences/emailp.py
index c38e884025..f8f3958745 100644
--- a/src/calibre/gui2/preferences/emailp.py
+++ b/src/calibre/gui2/preferences/emailp.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import re
 import textwrap
 
diff --git a/src/calibre/gui2/preferences/tweaks.py b/src/calibre/gui2/preferences/tweaks.py
index 7ac430b014..cb8dc7afdb 100644
--- a/src/calibre/gui2/preferences/tweaks.py
+++ b/src/calibre/gui2/preferences/tweaks.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import textwrap
 from collections import OrderedDict
 from functools import partial
diff --git a/src/calibre/gui2/progress_indicator/__init__.py b/src/calibre/gui2/progress_indicator/__init__.py
index 6d9fc45e9d..87d86cb183 100644
--- a/src/calibre/gui2/progress_indicator/__init__.py
+++ b/src/calibre/gui2/progress_indicator/__init__.py
@@ -2,8 +2,6 @@
 # vim:fileencoding=utf-8
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
-
-
 from PyQt5.Qt import (
     QDialog, QLabel, QSizePolicy, QStackedLayout, QStackedWidget, Qt, QVBoxLayout,
     QWidget
diff --git a/src/calibre/gui2/qt_file_dialogs.py b/src/calibre/gui2/qt_file_dialogs.py
index 635e3631c5..696fb65235 100644
--- a/src/calibre/gui2/qt_file_dialogs.py
+++ b/src/calibre/gui2/qt_file_dialogs.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 
 from PyQt5.Qt import QFileDialog, QObject
diff --git a/src/calibre/gui2/splash_screen.py b/src/calibre/gui2/splash_screen.py
index 580565c6eb..bd5c3d4714 100644
--- a/src/calibre/gui2/splash_screen.py
+++ b/src/calibre/gui2/splash_screen.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import (
     QApplication, QBrush, QColor, QFont, QFontMetrics, QPen, QPixmap, QSplashScreen,
     Qt
diff --git a/src/calibre/gui2/store/__init__.py b/src/calibre/gui2/store/__init__.py
index 61facb0f18..7e85033c43 100644
--- a/src/calibre/gui2/store/__init__.py
+++ b/src/calibre/gui2/store/__init__.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/basic_config.py b/src/calibre/gui2/store/basic_config.py
index 089380c7ba..85a9818db7 100644
--- a/src/calibre/gui2/store/basic_config.py
+++ b/src/calibre/gui2/store/basic_config.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
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 575f40b280..61d8003fa3 100644
--- a/src/calibre/gui2/store/config/chooser/adv_search_builder.py
+++ b/src/calibre/gui2/store/config/chooser/adv_search_builder.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/config/chooser/chooser_dialog.py b/src/calibre/gui2/store/config/chooser/chooser_dialog.py
index 502f70ec70..dd6576e243 100644
--- a/src/calibre/gui2/store/config/chooser/chooser_dialog.py
+++ b/src/calibre/gui2/store/config/chooser/chooser_dialog.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/config/chooser/chooser_widget.py b/src/calibre/gui2/store/config/chooser/chooser_widget.py
index 3ad9c64c14..177ed244d8 100644
--- a/src/calibre/gui2/store/config/chooser/chooser_widget.py
+++ b/src/calibre/gui2/store/config/chooser/chooser_widget.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/config/chooser/models.py b/src/calibre/gui2/store/config/chooser/models.py
index 73dd26cc51..e9f9ef5bb4 100644
--- a/src/calibre/gui2/store/config/chooser/models.py
+++ b/src/calibre/gui2/store/config/chooser/models.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/config/chooser/results_view.py b/src/calibre/gui2/store/config/chooser/results_view.py
index 991529f022..3c1a8732a7 100644
--- a/src/calibre/gui2/store/config/chooser/results_view.py
+++ b/src/calibre/gui2/store/config/chooser/results_view.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/config/search/search_widget.py b/src/calibre/gui2/store/config/search/search_widget.py
index ec2e29a288..aeb0839b10 100644
--- a/src/calibre/gui2/store/config/search/search_widget.py
+++ b/src/calibre/gui2/store/config/search/search_widget.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/config/store.py b/src/calibre/gui2/store/config/store.py
index de0fbff74c..d1f9dc8bfa 100644
--- a/src/calibre/gui2/store/config/store.py
+++ b/src/calibre/gui2/store/config/store.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/opensearch_store.py b/src/calibre/gui2/store/opensearch_store.py
index 745607776a..67447b5e81 100644
--- a/src/calibre/gui2/store/opensearch_store.py
+++ b/src/calibre/gui2/store/opensearch_store.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/search/adv_search_builder.py b/src/calibre/gui2/store/search/adv_search_builder.py
index 7c5c7e9a43..decbed987d 100644
--- a/src/calibre/gui2/store/search/adv_search_builder.py
+++ b/src/calibre/gui2/store/search/adv_search_builder.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/search/download_thread.py b/src/calibre/gui2/store/search/download_thread.py
index 075a29c57d..5ae0c9671c 100644
--- a/src/calibre/gui2/store/search/download_thread.py
+++ b/src/calibre/gui2/store/search/download_thread.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/search/models.py b/src/calibre/gui2/store/search/models.py
index e03b21cef7..ab87877f92 100644
--- a/src/calibre/gui2/store/search/models.py
+++ b/src/calibre/gui2/store/search/models.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/search/results_view.py b/src/calibre/gui2/store/search/results_view.py
index 514c4f3c86..0bed9cee29 100644
--- a/src/calibre/gui2/store/search/results_view.py
+++ b/src/calibre/gui2/store/search/results_view.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/search/search.py b/src/calibre/gui2/store/search/search.py
index 4be78798f3..1596046840 100644
--- a/src/calibre/gui2/store/search/search.py
+++ b/src/calibre/gui2/store/search/search.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/search_result.py b/src/calibre/gui2/store/search_result.py
index c050e8605c..68c4ce30d8 100644
--- a/src/calibre/gui2/store/search_result.py
+++ b/src/calibre/gui2/store/search_result.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/gui2/store/web_store.py b/src/calibre/gui2/store/web_store.py
index 9524615fc6..e64be72b21 100644
--- a/src/calibre/gui2/store/web_store.py
+++ b/src/calibre/gui2/store/web_store.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 import os
 import shutil
diff --git a/src/calibre/gui2/store/web_store_dialog.py b/src/calibre/gui2/store/web_store_dialog.py
index 3f8f17ea8f..1f9726108c 100644
--- a/src/calibre/gui2/store/web_store_dialog.py
+++ b/src/calibre/gui2/store/web_store_dialog.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 from base64 import standard_b64encode
 from itertools import count
diff --git a/src/calibre/gui2/tag_mapper.py b/src/calibre/gui2/tag_mapper.py
index 12c84d4011..b3bba22afc 100644
--- a/src/calibre/gui2/tag_mapper.py
+++ b/src/calibre/gui2/tag_mapper.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from collections import OrderedDict
 import textwrap
 
diff --git a/src/calibre/gui2/toc/main.py b/src/calibre/gui2/toc/main.py
index f9bf0e73f3..b2c0e37ff9 100644
--- a/src/calibre/gui2/toc/main.py
+++ b/src/calibre/gui2/toc/main.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import sys
 import textwrap
diff --git a/src/calibre/gui2/tweak_book/check_links.py b/src/calibre/gui2/tweak_book/check_links.py
index 750c4eacac..eefa367c39 100644
--- a/src/calibre/gui2/tweak_book/check_links.py
+++ b/src/calibre/gui2/tweak_book/check_links.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from collections import defaultdict
 from threading import Thread
 
diff --git a/src/calibre/gui2/tweak_book/editor/comments.py b/src/calibre/gui2/tweak_book/editor/comments.py
index 985ecf1faa..f6460938c3 100644
--- a/src/calibre/gui2/tweak_book/editor/comments.py
+++ b/src/calibre/gui2/tweak_book/editor/comments.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import QTextCursor
 
 opening_map = {
diff --git a/src/calibre/gui2/tweak_book/text_search.py b/src/calibre/gui2/tweak_book/text_search.py
index 93eb3fd294..e63f42a813 100644
--- a/src/calibre/gui2/tweak_book/text_search.py
+++ b/src/calibre/gui2/tweak_book/text_search.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import (
     QWidget, QHBoxLayout, QVBoxLayout, QLabel, QComboBox, QPushButton, QIcon,
     pyqtSignal, QFont, QCheckBox, QSizePolicy
diff --git a/src/calibre/gui2/viewer/annotations.py b/src/calibre/gui2/viewer/annotations.py
index f46819a5c0..1a6bfc306a 100644
--- a/src/calibre/gui2/viewer/annotations.py
+++ b/src/calibre/gui2/viewer/annotations.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from collections import defaultdict
 from io import BytesIO
 from operator import itemgetter
diff --git a/src/calibre/gui2/viewer/bookmarks.py b/src/calibre/gui2/viewer/bookmarks.py
index b5187362e4..9941152dc5 100644
--- a/src/calibre/gui2/viewer/bookmarks.py
+++ b/src/calibre/gui2/viewer/bookmarks.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 
 from PyQt5.Qt import (
diff --git a/src/calibre/gui2/viewer/convert_book.py b/src/calibre/gui2/viewer/convert_book.py
index 7c043908cf..362075b095 100644
--- a/src/calibre/gui2/viewer/convert_book.py
+++ b/src/calibre/gui2/viewer/convert_book.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import errno
 import json
 import os
diff --git a/src/calibre/gui2/viewer/lookup.py b/src/calibre/gui2/viewer/lookup.py
index 2c614b9480..0cf65dfb6d 100644
--- a/src/calibre/gui2/viewer/lookup.py
+++ b/src/calibre/gui2/viewer/lookup.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import sys
 
diff --git a/src/calibre/gui2/viewer/main.py b/src/calibre/gui2/viewer/main.py
index 745c698907..a37270a410 100644
--- a/src/calibre/gui2/viewer/main.py
+++ b/src/calibre/gui2/viewer/main.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import sys
 from threading import Thread
diff --git a/src/calibre/gui2/viewer/overlay.py b/src/calibre/gui2/viewer/overlay.py
index 9b6e105507..a02dc448e4 100644
--- a/src/calibre/gui2/viewer/overlay.py
+++ b/src/calibre/gui2/viewer/overlay.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import QWidget, Qt, QFontInfo, QLabel, QVBoxLayout
 
 from calibre.gui2.progress_indicator import ProgressIndicator
diff --git a/src/calibre/gui2/viewer/shortcuts.py b/src/calibre/gui2/viewer/shortcuts.py
index c05a1acb20..7063cd6312 100644
--- a/src/calibre/gui2/viewer/shortcuts.py
+++ b/src/calibre/gui2/viewer/shortcuts.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from PyQt5.Qt import QKeySequence, QMainWindow, Qt
 
 
diff --git a/src/calibre/gui2/viewer/toc.py b/src/calibre/gui2/viewer/toc.py
index fe5a190c36..9fdeee69b4 100644
--- a/src/calibre/gui2/viewer/toc.py
+++ b/src/calibre/gui2/viewer/toc.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import re
 from functools import partial
 
diff --git a/src/calibre/gui2/viewer/toolbars.py b/src/calibre/gui2/viewer/toolbars.py
index d5633805fb..bbc3964652 100644
--- a/src/calibre/gui2/viewer/toolbars.py
+++ b/src/calibre/gui2/viewer/toolbars.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 from functools import partial
 
diff --git a/src/calibre/gui2/viewer/ui.py b/src/calibre/gui2/viewer/ui.py
index f3b3ec8db9..22933f48ef 100644
--- a/src/calibre/gui2/viewer/ui.py
+++ b/src/calibre/gui2/viewer/ui.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 import os
 import re
diff --git a/src/calibre/gui2/viewer/web_view.py b/src/calibre/gui2/viewer/web_view.py
index ff029d8a0a..fa1ae331c6 100644
--- a/src/calibre/gui2/viewer/web_view.py
+++ b/src/calibre/gui2/viewer/web_view.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import shutil
 import sys
diff --git a/src/calibre/gui2/webengine.py b/src/calibre/gui2/webengine.py
index 939ce93fb5..709f1a17fe 100644
--- a/src/calibre/gui2/webengine.py
+++ b/src/calibre/gui2/webengine.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 
 from PyQt5.Qt import QObject, Qt, pyqtSignal
diff --git a/src/calibre/gui2/widgets2.py b/src/calibre/gui2/widgets2.py
index 262e38af22..c8a6db2bde 100644
--- a/src/calibre/gui2/widgets2.py
+++ b/src/calibre/gui2/widgets2.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2013, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import weakref
 
 from PyQt5.Qt import (
diff --git a/src/calibre/library/comments.py b/src/calibre/library/comments.py
index 1fefa181b2..f98008147b 100644
--- a/src/calibre/library/comments.py
+++ b/src/calibre/library/comments.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import re
 
 from calibre import prepare_string_for_xml
diff --git a/src/calibre/srv/books.py b/src/calibre/srv/books.py
index 8fbeb36a84..36f8aad7bb 100644
--- a/src/calibre/srv/books.py
+++ b/src/calibre/srv/books.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import errno
 import json as jsonlib
 import os
diff --git a/src/calibre/srv/cdb.py b/src/calibre/srv/cdb.py
index c5756af1ba..333a31d096 100644
--- a/src/calibre/srv/cdb.py
+++ b/src/calibre/srv/cdb.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 from functools import partial
 from io import BytesIO
diff --git a/src/calibre/srv/code.py b/src/calibre/srv/code.py
index 3ebb748427..44156a24c5 100644
--- a/src/calibre/srv/code.py
+++ b/src/calibre/srv/code.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import hashlib
 import os
 import random
diff --git a/src/calibre/srv/convert.py b/src/calibre/srv/convert.py
index f586e8dbef..2a758e3695 100644
--- a/src/calibre/srv/convert.py
+++ b/src/calibre/srv/convert.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import shutil
 import tempfile
diff --git a/src/calibre/srv/legacy.py b/src/calibre/srv/legacy.py
index a6b863c629..c3a782e668 100644
--- a/src/calibre/srv/legacy.py
+++ b/src/calibre/srv/legacy.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from functools import partial
 
 from lxml.html import tostring
diff --git a/src/calibre/srv/library_broker.py b/src/calibre/srv/library_broker.py
index b56bf029a3..a22683fe93 100644
--- a/src/calibre/srv/library_broker.py
+++ b/src/calibre/srv/library_broker.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 from collections import OrderedDict, defaultdict
 from threading import RLock as Lock
diff --git a/src/calibre/srv/render_book.py b/src/calibre/srv/render_book.py
index 1de49da445..ec44ed311b 100644
--- a/src/calibre/srv/render_book.py
+++ b/src/calibre/srv/render_book.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 import os
 import re
diff --git a/src/calibre/srv/users_api.py b/src/calibre/srv/users_api.py
index 37ddb86cd7..5bb570311b 100644
--- a/src/calibre/srv/users_api.py
+++ b/src/calibre/srv/users_api.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 
 from calibre import as_unicode
diff --git a/src/calibre/srv/web_socket.py b/src/calibre/srv/web_socket.py
index 0fb2302fe5..84bd0e93f8 100644
--- a/src/calibre/srv/web_socket.py
+++ b/src/calibre/srv/web_socket.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import socket
 import weakref
diff --git a/src/calibre/translations/msgfmt.py b/src/calibre/translations/msgfmt.py
index 989ceca5e7..5054d7c737 100644
--- a/src/calibre/translations/msgfmt.py
+++ b/src/calibre/translations/msgfmt.py
@@ -3,7 +3,6 @@
 # Written by Martin v. Löwis <loewis@informatik.hu-berlin.de>
 
 
-
 """Generate binary message catalog from textual translation description.
 
 This program converts a textual Uniforum-style message catalog (.po file) into
diff --git a/src/calibre/utils/__init__.py b/src/calibre/utils/__init__.py
index 8b1eff4899..bbca860b44 100644
--- a/src/calibre/utils/__init__.py
+++ b/src/calibre/utils/__init__.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 
-
 __license__   = 'GPL v3'
 __copyright__ = '2008, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/file_type_icons.py b/src/calibre/utils/file_type_icons.py
index afa069bbf1..0f45874ab1 100644
--- a/src/calibre/utils/file_type_icons.py
+++ b/src/calibre/utils/file_type_icons.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2015, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 EXT_MAP = {
     'default' : 'unknown',
     'dir'     : 'dir',
diff --git a/src/calibre/utils/fonts/sfnt/merge.py b/src/calibre/utils/fonts/sfnt/merge.py
index 66b61626b5..b1f012b46f 100644
--- a/src/calibre/utils/fonts/sfnt/merge.py
+++ b/src/calibre/utils/fonts/sfnt/merge.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from collections import OrderedDict
 from functools import partial
 
diff --git a/src/calibre/utils/html2text.py b/src/calibre/utils/html2text.py
index b34f9965ad..51a44baa65 100644
--- a/src/calibre/utils/html2text.py
+++ b/src/calibre/utils/html2text.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 def html2text(html):
     from html2text import HTML2Text
     import re
diff --git a/src/calibre/utils/network.py b/src/calibre/utils/network.py
index 25d69ef552..d0143f9a8f 100644
--- a/src/calibre/utils/network.py
+++ b/src/calibre/utils/network.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2010, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from calibre.constants import iswindows, islinux, isbsd
 from calibre.utils.config_base import tweaks
 
diff --git a/src/calibre/utils/opensearch/description.py b/src/calibre/utils/opensearch/description.py
index 68d331114d..5d1ffc1cc3 100644
--- a/src/calibre/utils/opensearch/description.py
+++ b/src/calibre/utils/opensearch/description.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '''
 2011, John Schember <john@nachtimwald.com>,
diff --git a/src/calibre/utils/opensearch/query.py b/src/calibre/utils/opensearch/query.py
index 643cf5827e..bab8bddc6b 100644
--- a/src/calibre/utils/opensearch/query.py
+++ b/src/calibre/utils/opensearch/query.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2006, Ed Summers <ehs@pobox.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/opensearch/url.py b/src/calibre/utils/opensearch/url.py
index 2e8a23e91c..4e12d0468d 100644
--- a/src/calibre/utils/opensearch/url.py
+++ b/src/calibre/utils/opensearch/url.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2006, Ed Summers <ehs@pobox.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/random_ua.py b/src/calibre/utils/random_ua.py
index e24f51dc74..b825c0922f 100644
--- a/src/calibre/utils/random_ua.py
+++ b/src/calibre/utils/random_ua.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import json
 import random
 
diff --git a/src/calibre/utils/search_query_parser_test.py b/src/calibre/utils/search_query_parser_test.py
index b204e369e1..49807def13 100644
--- a/src/calibre/utils/search_query_parser_test.py
+++ b/src/calibre/utils/search_query_parser_test.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import operator
 import unittest
 
diff --git a/src/calibre/utils/smartypants.py b/src/calibre/utils/smartypants.py
index eaf548f4f6..b652c0100b 100644
--- a/src/calibre/utils/smartypants.py
+++ b/src/calibre/utils/smartypants.py
@@ -2,7 +2,6 @@
 # vim:fileencoding=utf-8
 
 
-
 __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/speedups.py b/src/calibre/utils/speedups.py
index a8874cde5f..9a7cb776d6 100644
--- a/src/calibre/utils/speedups.py
+++ b/src/calibre/utils/speedups.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 from polyglot.builtins import range, unicode_type
 
diff --git a/src/calibre/utils/tdir_in_cache.py b/src/calibre/utils/tdir_in_cache.py
index d297022486..995d5f4147 100644
--- a/src/calibre/utils/tdir_in_cache.py
+++ b/src/calibre/utils/tdir_in_cache.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import atexit
 import errno
 import os
diff --git a/src/calibre/utils/test_lock.py b/src/calibre/utils/test_lock.py
index 625bd431a8..03ae48c266 100644
--- a/src/calibre/utils/test_lock.py
+++ b/src/calibre/utils/test_lock.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import shutil
 import subprocess
diff --git a/src/calibre/utils/text2int.py b/src/calibre/utils/text2int.py
index 27c3061b90..77fdd4e215 100644
--- a/src/calibre/utils/text2int.py
+++ b/src/calibre/utils/text2int.py
@@ -1,7 +1,6 @@
 #!/usr/bin/env python
 
 
-
 __author__ = "stackoverflow community"
 __docformat__ = 'restructuredtext en'
 """
diff --git a/src/calibre/utils/unicode_names.py b/src/calibre/utils/unicode_names.py
index 443e07f0b2..b9c40f6ba1 100644
--- a/src/calibre/utils/unicode_names.py
+++ b/src/calibre/utils/unicode_names.py
@@ -3,7 +3,6 @@
 # License: GPLv3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from collections import defaultdict
 
 from calibre.constants import plugins
diff --git a/src/calibre/utils/unsmarten.py b/src/calibre/utils/unsmarten.py
index b9b460e266..c4b813a7f1 100644
--- a/src/calibre/utils/unsmarten.py
+++ b/src/calibre/utils/unsmarten.py
@@ -1,7 +1,6 @@
 # -*- coding: utf-8 -*-
 
 
-
 __license__ = 'GPL 3'
 __copyright__ = '2011, John Schember <john@nachtimwald.com>'
 __docformat__ = 'restructuredtext en'
diff --git a/src/calibre/utils/windows/wintest.py b/src/calibre/utils/windows/wintest.py
index 907ba88501..fedae1f2da 100644
--- a/src/calibre/utils/windows/wintest.py
+++ b/src/calibre/utils/windows/wintest.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 import os
 import unittest
 from polyglot.builtins import unicode_type
diff --git a/src/calibre/utils/wordcount.py b/src/calibre/utils/wordcount.py
index 1efb61ba38..5fc9c29102 100644
--- a/src/calibre/utils/wordcount.py
+++ b/src/calibre/utils/wordcount.py
@@ -2,7 +2,6 @@
 # vim:fileencoding=UTF-8:ts=4:sw=4:sta:et:sts=4:ai
 
 
-
 """
 Get word, character, and Asian character counts
 
diff --git a/src/polyglot/binary.py b/src/polyglot/binary.py
index 6cf64a5ab3..ceedc11fac 100644
--- a/src/polyglot/binary.py
+++ b/src/polyglot/binary.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from base64 import standard_b64decode, standard_b64encode
 from binascii import hexlify, unhexlify
 
diff --git a/src/polyglot/io.py b/src/polyglot/io.py
index 8d0df2725c..443d4a93ce 100644
--- a/src/polyglot/io.py
+++ b/src/polyglot/io.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2019, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from io import StringIO, BytesIO
 
 
diff --git a/src/polyglot/urllib.py b/src/polyglot/urllib.py
index 1a128d47b6..935fe1fde4 100644
--- a/src/polyglot/urllib.py
+++ b/src/polyglot/urllib.py
@@ -3,7 +3,6 @@
 # License: GPL v3 Copyright: 2018, Kovid Goyal <kovid at kovidgoyal.net>
 
 
-
 from urllib.request import (build_opener, getproxies, install_opener,  # noqa
         HTTPBasicAuthHandler, HTTPCookieProcessor, HTTPDigestAuthHandler,  # noqa
         url2pathname, urlopen, Request)  # noqa
diff --git a/src/tinycss/decoding.py b/src/tinycss/decoding.py
index a2a12ec4b3..979573e53e 100644
--- a/src/tinycss/decoding.py
+++ b/src/tinycss/decoding.py
@@ -11,7 +11,6 @@
 """
 
 
-
 import operator
 import re
 
diff --git a/src/tinycss/parsing.py b/src/tinycss/parsing.py
index 7daf4c78d2..2f9d9f9f58 100644
--- a/src/tinycss/parsing.py
+++ b/src/tinycss/parsing.py
@@ -10,8 +10,6 @@
 """
 
 
-
-
 # TODO: unit tests
 
 def split_on_comma(tokens):
diff --git a/src/tinycss/token_data.py b/src/tinycss/token_data.py
index 5f1aefe486..3e070bae8c 100644
--- a/src/tinycss/token_data.py
+++ b/src/tinycss/token_data.py
@@ -10,7 +10,6 @@
 """
 
 
-
 import re
 import sys
 import operator
diff --git a/src/tinycss/tokenizer.py b/src/tinycss/tokenizer.py
index 4aaf32ce3a..5ba17c871e 100644
--- a/src/tinycss/tokenizer.py
+++ b/src/tinycss/tokenizer.py
@@ -13,7 +13,6 @@
 """
 
 
-
 from tinycss import token_data