批量修改文件名称

#coding=utf-8
import os
#修改文件名称
pre_name_list=[]
change_name_list=[]
#读取文件
fo_cha=open("changed_pre_name.txt","r+")
fo_pre=open("changed_name.txt","r+")
try:
pre_name_list = fo_pre.readlines()
change_name_list = fo_cha.readlines()
finally:
fo_pre.close()
fo_cha.close()


print change_name_list
print pre_name_list
file_line = len(pre_name_list)
for i in xrange(0,file_line):
pre_name=pre_name_list[i]
chage_name=change_name_list[i]
if i!=file_line-1:
pre_name=pre_name[0:-1]
changed_name=chage_name[0:-1]
print pre_name+"==>>"+changed_name
os.rename("files/"+pre_name,"files/"+changed_name)