Python批量修改文件名-后缀

#Version: V1.0
#Author:lynclynn

#Description:Change the filename 
#CreateDate:20151130

#UpdateDate:

# -*- coding: UTF-8 -*-
import os
#列出当前目录(E:\Python\Code)下所有的文件
files =os.listdir("E:\Python\Code")

#分离文件名字和后缀
for filename in files:
    portion=os.path.splitext(filename)
    print portion
    #根据后缀来修改
    if portion[1]==".py":
        newname=portion[0]+".txt"
        #切换文件路径
        os.chdir("E:\Python\Code")
        os.rename(filename,newname)