Python 3 compatibility

test/win/generator-output-different-drive/gyptest-generator-output-different-drive.py

 #!/usr/bin/env python
 
 # 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.
 
 """
 Test that the generator output can be written to a different drive on Windows.
 """
 
 import os
 import TestGyp
 import string
 import subprocess
 import sys
 
 
 if sys.platform == 'win32':
   import win32api
 
   test = TestGyp.TestGyp(formats=['msvs', 'ninja'])
 
   def GetFirstFreeDriveLetter():
     """ Returns the first unused Windows drive letter in [A, Z] """
-    all_letters = [c for c in string.uppercase]
+    all_letters = [c for c in string.ascii_uppercase]
     in_use = win32api.GetLogicalDriveStrings()
     free = list(set(all_letters) - set(in_use))
     return free[0]
 
   output_dir = os.path.join('different-drive', 'output')
   if not os.path.isdir(os.path.abspath(output_dir)):
     os.makedirs(os.path.abspath(output_dir))
   output_drive = GetFirstFreeDriveLetter()
   subprocess.call(['subst', '%c:' % output_drive, os.path.abspath(output_dir)])
   try:
     test.run_gyp('prog.gyp', '--generator-output=%s' % (
         os.path.join(output_drive, 'output')))
     test.build('prog.gyp', test.ALL, chdir=os.path.join(output_drive, 'output'))
     test.built_file_must_exist('program', chdir=os.path.join(output_drive,
                                                              'output'),
                                type=test.EXECUTABLE)
     test.pass_test()
   finally:
     subprocess.call(['subst', '%c:' % output_drive, '/D'])