Python 3 compatibility

test/standalone/gyptest-standalone.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.
 
 """
 Verifies that a project hierarchy created with the --generator-output=
 option can be built even when it's relocated to a different path.
 """
 
+from __future__ import print_function
+
 import TestGyp
 import os
 
 test = TestGyp.TestGyp()
 
 test.run_gyp('standalone.gyp', '-Gstandalone')
 
 # Look at all the files in the tree to make sure none
 # of them reference the gyp file.
 for root, dirs, files in os.walk("."):
   for file in files:
     # ignore ourself
     if os.path.splitext(__file__)[0] in file:
       continue
     file = os.path.join(root, file)
     contents = open(file).read()
     if 'standalone.gyp' in contents:
-      print 'gyp file referenced in generated output: %s' % file
+      print('gyp file referenced in generated output: %s' % file)
       test.fail_test()
 
 
 test.pass_test()