python 批量修改文件的后缀

1：文件地址  将.下载  去掉  C:\Users\Administrator\Desktop\2_files

2： 使用python

import os
import shutil

root='C:\\Users\\Administrator\\Desktop\\1_files'

for rt, dirs, files in os.walk(root):
    for f in files:
        fn = os.path.join(rt, f)
        nfn = fn.replace('.下载', '')
        print (nfn)
        if fn != nfn:
            shutil.move(fn, nfn)