python实现ip代理池功能示例

# !/usr/bin/env python# -*- coding: utf-8 -*-# @Version   ： 1.0# @Time     ： 2018/10/23 上午10:40# @Author    ： Yeoman# @Description ：import urllib.requestimport lxml.etreeimport telnetlibimport osheaders = {  'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36'}def get_proxy(page_num):  # 获取页面  req = urllib.request.Request('http://www.xicidaili.com/nn/{}'.format(page_num), headers=headers) # 构造request请求  response = urllib.request.urlopen(req) # 发送请求  html = response.read()  html = html.decode('utf-8')  # print(html)  # 解析页面  proxy_list = []  selector = lxml.etree.HTML(html)  rows = selector.xpath('//*[@id="ip_list"]//tr')  rows_total = len(rows)  row_xpath_head = '//*[@id="ip_list"]//tr['  row_ip_xpath_tail = ']/td[2]/text()'  row_port_xpath_tail = ']/td[3]/text()'  for i in range(1, rows_total):    ip_xpath = row_xpath_head + str(i+1) + row_ip_xpath_tail    port_xpath = row_xpath_head + str(i+1) + row_port_xpath_tail    ip = selector.xpath(ip_xpath)[0]    port = selector.xpath(port_xpath)[0]    ip_port = ip + ':' + port    proxy_list.append(ip_port)  return proxy_list# 检测代理ip是否可用def test_proxy_ip_port(proxy_ip_port):  print('当前代理ip：{}'.format(proxy_ip_port))  ip_port = proxy_ip_port.split(':')  ip = ip_port[0]  port = ip_port[1]  # 用telnet来验证ip是否可用  try:    telnetlib.Telnet(ip, port, timeout=10)  except:    return False  else:    return True# 把有效的ip写入本地def write_ip(proxy_ip):  with open('./ip.txt', 'a') as f:    f.write(proxy_ip + '/n')# 删除文件def del_file():  file_path = './ip.txt'  if os.path.exists(file_path):    os.remove(file_path)def run():  del_file()  proxy_ip_port_list = []  for i in range(1, 6): # 前5页    proxy_ip_port_list += get_proxy(i)  for i in range(100): # 一页有100条    proxy_ip_port = proxy_ip_port_list[i]    is_valid = test_proxy_ip_port(proxy_ip_port)    print(is_valid)    if is_valid:      # 写入ip到本地      write_ip(proxy_ip_port)if __name__ == '__main__':  run()