Python 3 compatibility

pylib/gyp/easy_xml_test.py

 #!/usr/bin/env python
 
 # Copyright (c) 2011 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.
 
 """ Unit tests for the easy_xml.py file. """
 
 import gyp.easy_xml as easy_xml
 import unittest
-import StringIO
+try:
+  from StringIO import StringIO
+except ImportError:
+  from io import StringIO
 
 
 class TestSequenceFunctions(unittest.TestCase):
 
   def setUp(self):
-    self.stderr = StringIO.StringIO()
+    self.stderr = StringIO()
 
   def test_EasyXml_simple(self):
     self.assertEqual(
       easy_xml.XmlToString(['test']),
       '<?xml version="1.0" encoding="utf-8"?><test/>')
 
     self.assertEqual(
       easy_xml.XmlToString(['test'], encoding='Windows-1252'),
       '<?xml version="1.0" encoding="Windows-1252"?><test/>')
 
@@ skipping 66 matching lines @@
              'Label': 'Configuration'},
             ['ConfigurationType', 'Application'],
             ['CharacterSet', 'Unicode']
           ]
         ])
     self.assertEqual(xml, target)
 
 
 if __name__ == '__main__':
   unittest.main()