用python 重命名文件夹下文件

# -*- coding: utf-8 -*-
import os
'''
Description:
    when we load xls data into unix ,the file name with some space while our process can not recognise those file,
    so we want to write a samll a process and put it on unix to rename the files
'''
def renamefile():
    path = 'C:\Users\IBM_ADMIN\Desktop\cognos\datastage\excel\1Q-4Q files'
    filelist = os.listdir(path)
    for file in filelist:
        Oldfile =  os.path.join(path,file)
        if os.path.isdir(Oldfile):
            continue
        filename=os.path.splitext(file)[0]
        filetype=os.path.splitext(file)[1]
        newfilename = filename.replace(' ','_')
        Newfile=os.path.join(path,newfilename+filetype)
        os.rename(Oldfile,Newfile)
print "Process is going...."
renamefile();

print "Process done"

'''
ls -lt target*| head -10
'''