本文实例讲述了python实现ip代理池功能。分享给大家供大家参考,具体如下:
爬取的代理源为西刺代理。
- 用xpath解析页面
- 用telnet来验证ip是否可用
- 把有效的ip写入到本地txt中。当然也可以写入到redis、mongodb中,也可以设置检测程序当代理池中的ip数不够(如:小于20个)时,启动该脚本来重新获取ip,本脚本的代码也要做相应的改变。
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# !/usr/bin/env python # -*- coding: utf-8 -*- # @Version : 1.0 # @Time : 2018/10/23 上午10:40 # @Author : Yeoman # @Description : import urllib.request import lxml.etree import telnetlib import os headers = { '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() |
希望本文所述对大家Python程序设计有所帮助。
原文链接:https://blog.csdn.net/Yeoman92/article/details/83310646