OSError：[Errno 22]参数无效：＆＃39; character.txt＆＃39;

Question

我似乎得到了这个奇怪的错误Errno 22] Invalid argument: 'character.txt'。我该如何解决这个问题？

#!/usr/bin/python
#coding:utf-8
import re
import os.path
def gci(rootdir):
for parent,dirnames,filenames in os.walk(rootdir):
    for filename in filenames:
        text=os.path.join(parent,filename)
        split_to_character(text)