python 批量修改文件名代码

下面是python 批量修改文件名代码
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#!/usr/bin/env python  
#coding=utf-8  
import os,os.path  
import shutil,string  
dir = C:\test
for i in os.listdir(dir):  
    newfile = i.replace(.,_)  
    oldfullfile = dir \ i  
    newfullfile = dir \ newfile  
    print oldfullfile  
    print newfullfile  
    shutil.move(oldfullfile,newfullfile)  
    print i 

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