Handle KeyboardInterrupt consistently in python scripts

chrome-update.py

 #!/usr/bin/env python
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 import re
 import subprocess
 import sys
 import urllib
@@ skipping 42 matching lines @@
 
 def DoBuild(chrome_root, args):
   """Download compile.py and run it."""
   compile_path = os.path.join(chrome_root, 'compile.py')
   Fetch(COMPILE_URL, compile_path)
   Fetch(UTILS_URL, os.path.join(chrome_root, 'chromium_utils.py'))
   cmd = ['python', compile_path] + args
   return subprocess.call(cmd, cwd=chrome_root, shell=IS_WIN)
 
 
-def Main(args):
+def main(args):
   if len(args) < 3:
     print('Usage: chrome-update.py <path> [options]')
     print('See options from compile.py at')
     print('  %s' % COMPILE_URL)
     print('\nFor more example, see the compile steps on the waterfall')
     return 1
 
   chrome_root = args[1]
   if not os.path.isdir(chrome_root):
     print('Path to chrome root (%s) not found.' % chrome_root)
     return 1
 
   rv = DoUpdate(chrome_root)
   if rv != 0:
     print('Update Failed.  Bailing.')
     return rv
 
   DoBuild(chrome_root, args[2:])
   print('Success!')
   return 0
 
 
 if __name__ == "__main__":
-  sys.exit(Main(sys.argv))
+  try:
+    sys.exit(main(sys.argv))
+  except KeyboardInterrupt:
+    sys.stderr.write('interrupted\n')
+    sys.exit(1)