Make code follow the Python style guidelines

bleeding_edge/dart/tools/gyp_dart.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 The Dart Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# This script is wrapper for Dart that adds some support for how GYP
-# is invoked by Dart beyond what can be done in the gclient hooks.
+"""
+Invoke gyp to generate build files for building the Dart VM.
+"""
 
 import os
 import subprocess
 import sys
 
-def Execute(args):
+def execute(args):
   process = subprocess.Popen(args)
   process.wait()
   return process.returncode
 
-if __name__ == '__main__':
-  args = ['python',  "dart/third_party/gyp/gyp", "--depth=dart",
-                 "-Idart/tools/gyp/all.gypi", "dart/dart.gyp"]
+def main():
+  args = ['python', 'dart/third_party/gyp/gyp', '--depth=dart',
+          '-Idart/tools/gyp/all.gypi', 'dart/dart.gyp']
 
   if sys.platform == 'win32':
     # Generate Visual Studio 2008 compatible files by default.
     if not os.environ.get('GYP_MSVS_VERSION'):
       args.extend(['-G', 'msvs_version=2008'])
 
-  sys.exit(Execute(args))
+  sys.exit(execute(args))
+
+if __name__ == '__main__':
+  main()