用/Python替换

Question

这不起作用：

import re
re.sub('\\', '/', "C:\\Users\\Judge")

错误：

Traceback (most recent call last):
  File "<pyshell#1>", line 1, in <module>
    re.sub('\\', '/', "C:\\Users")
  File "C:\Python27\lib\re.py", line 151, in sub
    return _compile(pattern, flags).sub(repl, string, count)
  File "C:\Python27\lib\re.py", line 244, in _compile
    raise error, v # invalid expression
error: bogus escape (end of line)