Python 3 compatibility

test/lib/TestWin.py

 # Copyright (c) 2014 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.
 
 """
 TestWin.py:  a collection of helpers for testing on Windows.
 """
 
 import errno
 import os
@@ skipping 45 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 = self._QueryBase('Sysnative', key, value)
-    except OSError, e:
+    except OSError as e:
       if e.errno == errno.ENOENT:
         text = self._QueryBase('System32', key, value)
       else:
         raise
     return text
 
   def GetValue(self, key, value):
     """Use reg.exe to obtain the value of a registry key.
 
     Args:
@@ skipping 15 matching lines @@
     """Use reg.exe to see if a key exists.
 
     Args:
       key: The registry key to check.
     Return:
       True if the key exists
     """
     if not self.Query(key):
       return False
     return True