python 修改文件名和提取文件到txt

修改文件名：

import os
import sys
file='C:'
#i = 0
def refilename(file):
dir = os.path.abspath(file)
dirlist=os.listdir(dir)
i=0
        for dir1 in dirlist:
dir1join=os.path.join(dir,dir1)
#for i in range(len(dirlist)):
k=(i+1)*1000
if dir1join !='.' and dir1join !='..' and os.path.isdir(dir1join): 
dirlist=os.listdir(dir1join)
for filename in dirlist:
olddir=os.path.join(dir1join,filename)
oldname=os.path.splitext(filename)[0]
filetype=os.path.splitext(filename)[1]