diff --git a/src/calibre/devices/kindle/driver.py b/src/calibre/devices/kindle/driver.py
index 1c84c42e90..c6635a873f 100644
--- a/src/calibre/devices/kindle/driver.py
+++ b/src/calibre/devices/kindle/driver.py
@@ -199,7 +199,7 @@ class KINDLE(USBMS):
         return bookmarked_books
 
     def generate_annotation_html(self, bookmark):
-        from calibre.ebooks.BeautifulSoup import BeautifulSoup, Tag, NavigableString
+        from calibre.ebooks.BeautifulSoup import BeautifulSoup, Tag
         # Returns <div class="user_annotations"> ... </div>
         last_read_location = bookmark.last_read_location
         timestamp = datetime.datetime.utcfromtimestamp(bookmark.timestamp)
@@ -540,9 +540,9 @@ class KINDLE2(KINDLE):
                         if temp in self.EXTRA_CUSTOMIZATION_CHOICES[self.OPT_APNX_METHOD]:
                             method = temp
                         else:
-                            print ("Invalid method choice for this book (%r), ignoring." % temp)
+                            print("Invalid method choice for this book (%r), ignoring." % temp)
                     except:
-                        print 'Could not retrieve override method choice, using default.'
+                        print('Could not retrieve override method choice, using default.')
                 apnx_builder.write_apnx(filepath, apnx_path, method=method, page_count=custom_page_count)
             except:
                 print 'Failed to generate APNX'
diff --git a/src/calibre/devices/kobo/driver.py b/src/calibre/devices/kobo/driver.py
index 629f1bd755..cbc4c2e6d1 100644
--- a/src/calibre/devices/kobo/driver.py
+++ b/src/calibre/devices/kobo/driver.py
@@ -477,8 +477,8 @@ class KOBO(USBMS):
 
             cursor.close()
             if ImageID is None:
-                print "Error condition ImageID was not found"
-                print "You likely tried to delete a book that the kobo has not yet added to the database"
+                print("Error condition ImageID was not found")
+                print("You likely tried to delete a book that the kobo has not yet added to the database")
 
         # If all this succeeds we need to delete the images files via the ImageID
         return ImageID
@@ -1170,7 +1170,7 @@ class KOBO(USBMS):
 
     def generate_annotation_html(self, bookmark):
         import calendar
-        from calibre.ebooks.BeautifulSoup import BeautifulSoup, Tag, NavigableString
+        from calibre.ebooks.BeautifulSoup import BeautifulSoup, Tag
         # Returns <div class="user_annotations"> ... </div>
         # last_read_location = bookmark.last_read_location
         # timestamp = bookmark.timestamp
diff --git a/src/calibre/ebooks/conversion/plugins/chm_input.py b/src/calibre/ebooks/conversion/plugins/chm_input.py
index efc91d7704..911418f801 100644
--- a/src/calibre/ebooks/conversion/plugins/chm_input.py
+++ b/src/calibre/ebooks/conversion/plugins/chm_input.py
@@ -131,8 +131,7 @@ class CHMInput(InputFormatPlugin):
 
         def unquote_path(x):
             y = unquote(x)
-            if (not os.path.exists(os.path.join(base, x)) and
-                os.path.exists(os.path.join(base, y))):
+            if (not os.path.exists(os.path.join(base, x)) and os.path.exists(os.path.join(base, y))):
                 x = y
             return x
 
@@ -144,8 +143,7 @@ class CHMInput(InputFormatPlugin):
                 raw = unquote_path(child.href or '')
                 rsrcname = os.path.basename(raw)
                 rsrcpath = os.path.join(subpath, rsrcname)
-                if (not os.path.exists(os.path.join(base, rsrcpath)) and
-                        os.path.exists(os.path.join(base, raw))):
+                if (not os.path.exists(os.path.join(base, rsrcpath)) and os.path.exists(os.path.join(base, raw))):
                     rsrcpath = raw
 
                 if '%' not in rsrcpath:
diff --git a/src/calibre/ebooks/conversion/plugins/html_input.py b/src/calibre/ebooks/conversion/plugins/html_input.py
index 2ebd7f6433..fa9329fc40 100644
--- a/src/calibre/ebooks/conversion/plugins/html_input.py
+++ b/src/calibre/ebooks/conversion/plugins/html_input.py
@@ -92,8 +92,7 @@ class HTMLInput(InputFormatPlugin):
             return self._is_case_sensitive
         if not path or not os.path.exists(path):
             return islinux or isbsd
-        self._is_case_sensitive = not (os.path.exists(path.lower()) and
-                                       os.path.exists(path.upper()))
+        self._is_case_sensitive = not (os.path.exists(path.lower()) and os.path.exists(path.upper()))
         return self._is_case_sensitive
 
     def create_oebbook(self, htmlpath, basedir, opts, log, mi):
diff --git a/src/calibre/ebooks/conversion/plugins/oeb_output.py b/src/calibre/ebooks/conversion/plugins/oeb_output.py
index 802f6f106a..92d9e375bb 100644
--- a/src/calibre/ebooks/conversion/plugins/oeb_output.py
+++ b/src/calibre/ebooks/conversion/plugins/oeb_output.py
@@ -57,9 +57,8 @@ class OEBOutput(OutputFormatPlugin):
 
             for item in oeb_book.manifest:
                 if (
-                        not self.opts.expand_css and
-                        item.media_type in OEB_STYLES and hasattr(item.data, 'cssText') and
-                        'nook' not in self.opts.output_profile.short_name):
+                        not self.opts.expand_css and item.media_type in OEB_STYLES and hasattr(
+                            item.data, 'cssText') and 'nook' not in self.opts.output_profile.short_name):
                     condense_sheet(item.data)
                 path = os.path.abspath(unquote(item.href))
                 dir = os.path.dirname(path)