python获取url的返回信息方法

#!/usr/bin/env python 
# -*- coding: utf-8 -*- 
import os
import sys
import urllib
import urllib2
import string
#########start 获取url的返回信息############
def jwkj_url_postget(url,vlaues):
 data = urllib.urlencode(values)
 req = urllib2.Request(url, data)
 response = urllib2.urlopen(req)
 str = response.read()
 return str
#########end 获取url的返回信息############
if __name__ == "__main__": 
 print jwkj_url_postget('http://localhost/getTextAd.php',{'pmac':'001122334466'})