python正则表达式获取代理IP网站上的IP地址

import urllib.request
import re


def open_url(url):
    req  = urllib.request.Request(url)
    req.add_header("User-Agent",'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36')
    response = urllib.request.urlopen(req)
    page = urllib.request.urlopen(req)
    html = page.read().decode('utf-8')
    return html

def get_img(html):
    p =  r'(?:(?:[0,1]?d?d|2[0-4]d|25[0-5]).){3}(?:[0,1]?d?d|2[0-4]d|25[0-5])'
    iplist = re.findall(p,html) 
    for each in iplist:
        print(each) 

if __name__ == "__main__":
    url = "http://www.xsdaili.com/dayProxy/ip/1021.html"
    get_img(open_url(url))