python爬取代理ip的示例

import requests
from lxml import etree
import time
import json

def get_all_proxy(page):
  url = 'https://www.xicidaili.com/nn/%s'%page
  headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36',
  }
  response = requests.get(url, headers=headers)
  html_ele = etree.HTML(response.text)
  ip_eles = html_ele.xpath('//table[@id="ip_list"]/tr/td[2]/text()')
  port_ele = html_ele.xpath('//table[@id="ip_list"]/tr/td[3]/text()')
  print(ip_eles)
  proxy_list = []
  for i in range(0,len(ip_eles)):
    check_all_proxy(ip_eles[i]，port_ele[i])
  return proxy_list

def check_all_proxy(host,port):
  type = 'http'
  proxies = {}
  proxy_str = "%s://@%s:%s" % (type, host, port)
  valid_proxy_list = []
  url = 'http://www.baidu.com/'
  proxy_dict = {
      'http': proxy_str,
      'https': proxy_str
    }
  try:
      start_time = time.time()
      response = requests.get(url, proxies=proxy_dict, timeout=5)
      if response.status_code == 200:
        end_time = time.time()
        print('代理可用：' + proxy_str)
        print('耗时:' + str(end_time - start_time))
        proxies['type'] = type
        proxies['host'] = host
        proxies['port'] = port
        proxiesJson = json.dumps(proxies)
        with open('verified_y.json', 'a+') as f:
          f.write(proxiesJson + '\n')
        print("已写入：%s" % proxy_str)
        valid_proxy_list.append(proxy_str)
      else:
        print('代理超时')
  except:
      print('代理不可用--------------->'+proxy_str)

if __name__ == '__main__':
  for i in range(1,11): #选取前十页数据使用
    proxy_list = get_all_proxy(i)
    time.sleep(20)
    print(valid_proxy_list)