pep8

setup.py

@@ -8,11 +8,16 @@ __docformat__ = 'restructuredtext en'
 
 import sys, os
 
+
 def check_version_info():
     vi = sys.version_info
     if vi[0] == 2 and vi[1:3] >= (7, 9):
-        return None
-    raise SystemExit('calibre requires python >= 2.7.9 and < 3. Current python version: %s' % vi)
+        return
+    raise SystemExit(
+        'calibre requires python >= 2.7.9 and < 3. Current python version: %s'
+        % vi)
+
+
 check_version_info()
 
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
@@ -20,18 +25,30 @@ sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 import setup.commands as commands
 from setup import prints, get_warnings
 
+
 def option_parser():
     import optparse
     parser = optparse.OptionParser()
-    parser.add_option('-c', '--clean', default=False, action='store_true',
+    parser.add_option(
+        '-c',
+        '--clean',
+        default=False,
+        action='store_true',
         help=('Instead of running the command delete all files generated '
               'by the command'))
-    parser.add_option('--clean-backups', default=False, action='store_true',
+    parser.add_option(
+        '--clean-backups',
+        default=False,
+        action='store_true',
         help='Delete all backup files from the source tree')
-    parser.add_option('--clean-all', default=False, action='store_true',
+    parser.add_option(
+        '--clean-all',
+        default=False,
+        action='store_true',
         help='Delete all machine generated files from the source tree')
     return parser
 
+
 def clean_backups():
     for root, _, files in os.walk('.'):
         for name in files:
@@ -97,5 +114,6 @@ def main(args=sys.argv):
 
     return 0
 
+
 if __name__ == '__main__':
     sys.exit(main())