Python 3 compatibility

pylib/gyp/MSVSVersion.py

 # Copyright (c) 2013 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.
 
 """Handle version information related to Visual Stuio."""
 
 import errno
 import os
 import re
 import subprocess
@@ skipping 150 matching lines @@
 
   Arguments:
     key: The registry key.
     value: The particular registry value to read (optional).
   Return:
     stdout from reg.exe, or None for failure.
   """
   text = None
   try:
     text = _RegistryQueryBase('Sysnative', key, value)
-  except OSError, e:
+  except OSError as e:
     if e.errno == errno.ENOENT:
       text = _RegistryQueryBase('System32', key, value)
     else:
       raise
   return text
 
 
 def _RegistryGetValueUsingWinReg(key, value):
   """Use the _winreg module to obtain the value of a registry key.
 
   Args:
     key: The registry key.
     value: The particular registry value to read.
   Return:
     contents of the registry key's value, or None on failure.  Throws
     ImportError if _winreg is unavailable.
   """
-  import _winreg
+  try:
+    import _winreg as winreg
+  except ImportError:
+    import winreg
   try:
     root, subkey = key.split('\\', 1)
     assert root == 'HKLM'  # Only need HKLM for now.
-    with _winreg.OpenKey(_winreg.HKEY_LOCAL_MACHINE, subkey) as hkey:
-      return _winreg.QueryValueEx(hkey, value)[0]
+    with winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE, subkey) as hkey:
+      return winreg.QueryValueEx(hkey, value)[0]
   except WindowsError:
     return None
 
 
 def _RegistryGetValue(key, value):
   """Use _winreg or reg.exe to obtain the value of a registry key.
 
   Using _winreg is preferable because it solves an issue on some corporate
   environments where access to reg.exe is locked down. However, we still need
   to fallback to reg.exe for the case where the _winreg module is not available
@@ skipping 239 matching lines @@
   versions = _DetectVisualStudioVersions(version_map[version], 'e' in version)
   if not versions:
     if not allow_fallback:
       raise ValueError('Could not locate Visual Studio installation.')
     if version == 'auto':
       # Default to 2005 if we couldn't find anything
       return _CreateVersion('2005', None)
     else:
       return _CreateVersion(version, None)
   return versions[0]