`NameError: name 'WindowsError' is not defined`

[asmeurer]

> Testing interpreter arch -i386 /Library/Frameworks/Python.framework/Versions//3.2/bin/python3
Traceback (most recent call last):
  File "bin/use2to3", line 107, in <module>
    except (CalledProcessError, WindowsError):
NameError: name 'WindowsError' is not defined
Traceback (most recent call last):
  File "./sympy-bot", line 706, in <module>
    main()
  File "./sympy-bot", line 248, in main
    dispatch_reviews(options, urls, username=username, password=password, token=token)
  File "./sympy-bot", line 500, in dispatch_reviews
    python3[i], merge_commit, run2to3=run2to3)
  File "/Users/aaronmeurer/Documents/Python/sympy/sympy-bot/utils/testrunner.py", line 40, in run_tests
    cmd("python %s" % use2to3, cwd=master_repo_path)
  File "/Users/aaronmeurer/Documents/Python/sympy/sympy-bot/utils/cmd.py", line 33, in cmd
    raise CmdException("Command '%s' failed with err=%d. %s" % (s, r, output))
utils.cmd.CmdException: Command 'python bin/use2to3' failed with err=1. None