python获取url的返回信息

#!/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'})