Cleanup pylint errors

pylib/gyp/__init__.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import copy
 import gyp.input
 import optparse
 import os.path
@@ skipping 353 matching lines @@
 
   if home_dot_gyp and not os.path.exists(home_dot_gyp):
     home_dot_gyp = None
 
   if not options.formats:
     # If no format was given on the command line, then check the env variable.
     generate_formats = []
     if options.use_environment:
       generate_formats = os.environ.get('GYP_GENERATORS', [])
     if generate_formats:
-      generate_formats = re.split('[\s,]', generate_formats)
+      generate_formats = re.split(r'[\s,]', generate_formats)
     if generate_formats:
       options.formats = generate_formats
     else:
       # Nothing in the variable, default based on platform.
       if sys.platform == 'darwin':
         options.formats = ['xcode']
       elif sys.platform in ('win32', 'cygwin'):
         options.formats = ['msvs']
       else:
         options.formats = ['make']
@@ skipping 141 matching lines @@
   except GypError, e:
     sys.stderr.write("gyp: %s\n" % e)
     return 1
 
 # NOTE: setuptools generated console_scripts calls function with no arguments
 def script_main():
   return main(sys.argv[1:])
 
 if __name__ == '__main__':
   sys.exit(script_main())