diff --git a/src/calibre/utils/config_base.py b/src/calibre/utils/config_base.py
index a9860b60fa..c099574cb0 100644
--- a/src/calibre/utils/config_base.py
+++ b/src/calibre/utils/config_base.py
@@ -116,7 +116,6 @@ class OptionSet(object):
         if name in self.preferences:
             self.preferences.remove(name)
 
-
     def add_opt(self, name, switches=[], help=None, type=None, choices=None,
                  group=None, default=None, action=None, metavar=None):
         '''
@@ -174,7 +173,6 @@ class OptionSet(object):
                         )
             g.add_option(*pref.switches, **args)
 
-
         return parser
 
     def get_override_section(self, src):
@@ -230,7 +228,7 @@ class OptionSet(object):
 
     def serialize(self, opts):
         src = '# %s\n\n'%(self.description.replace('\n', '\n# '))
-        groups = [self.render_group(name, self.groups.get(name, ''), opts) \
+        groups = [self.render_group(name, self.groups.get(name, ''), opts)
                                         for name in [None] + self.group_list]
         return src + '\n\n'.join(groups)
 
@@ -265,7 +263,6 @@ class Config(ConfigInterface):
         ConfigInterface.__init__(self, description)
         self.config_file_path = os.path.join(config_dir, basename+'.py')
 
-
     def parse(self):
         src = ''
         if os.path.exists(self.config_file_path):
@@ -369,7 +366,6 @@ class ConfigProxy(object):
         return self.__config.get_option(key).help
 
 
-
 def _prefs():
     c = Config('global', 'calibre wide preferences')
     c.add_opt('database_path',