Python 基础 网页爬虫 代码实例

Python现在很火,老季最近也想学习一下。下面我们写了一段练练手,大部分代码是从网上复制黏贴来的。

目的

采集老季博客的列表,前24页,然后将爬到的标题及单页网址打印出来。我们将会使用:

  • queue 列队
  • threading 创建多线程采集
  • BeautifulSoup 来分析网页

代码实例

#!/usr/bin/env 
# coding: utf-8

#队列自己带锁,自己阻塞,线程安全的,不用自己显式的去编写
import threading
import requests
import urllib
import queue
from bs4 import BeautifulSoup
import time

class Foo(threading.Thread):
    def __init__(self, queue):
        threading.Thread.__init__(self)
        self.queue = queue
        print('\r\nStarting Thread...',item,'\r\n')

    def run(self):
        while True:
            key = self.queue.get()#取key列表里面的元素
            print('\r\nGetting Page...',key,'\r\n')
            res = self.grab(key)#运行函数grab,传的参数是key
            self.queue.task_done()#取不到元素的时候自动退出程序
            print(res,'\r\n')

    def grab(self,key):
        url = 'https://www.jiloc.com'+'/page/'+str(key)#将数字幻化成字符串
        res = requests.get(url=url)
        res.encoding='utf-8'
        soup = BeautifulSoup(res.text,"html.parser")
        d = []
        for link in soup.select("h2.entry-title a"):
            d.append({'title': link.get_text(), 'href':link.get("href")})
        return d

if __name__ == '__main__':
    time_start=time.time()
    queue = queue.Queue()
    key = 24
    for i in range(key):
        queue.put(i+1)#将key加入队列里面,用于run()的调用

    for item in range(6):
        t = Foo(queue)
        t.setDaemon(True)#守护进程,如果主线程结束,则会退出
        t.start()
        
    queue.join()#阻塞,函数grab(1)执行完成,才会继续进行下一次grab(2)
    time_end=time.time()
    print('\r\ntime cost : ',round(time_end - time_start, 2),'s')

运行结果

{‘title’: ‘Make没有安装,错误sh: make: not found’, ‘href’: ‘https://www.jiloc.com/46018.html’}
{‘title’: ‘create table select from 和 insert into table select from区别’, ‘href’: ‘https://www.jiloc.com/46014.html’}
{‘title’: ‘Discuz官方论坛关闭发言权’, ‘href’: ‘https://www.jiloc.com/45806.html’}
{‘title’: ‘系统重启Reboot 后 Docker服务及容器自动启动设置’, ‘href’: ‘https://www.jiloc.com/46008.html’}
{‘title’: ‘PHP中如何将JSON格式字符串转换成http的url参数请求 图文教程’, ‘href’: ‘https://www.jiloc.com/45725.html’}{‘title’: ‘密码保护:WordPress 采集插件 wp-jpost 网站 8023mi.com 规则示例’, ‘href’: ‘https://www.jiloc.com/45038.html’}
{‘title’: ‘php中如何启用exec函数 宝塔面板中如何解除exec函数的禁用?’, ‘href’: ‘https://www.jiloc.com/44843.html’}
{‘title’: ‘LNMP1.6正式版已更新 已支持PHP7.3’, ‘href’: ‘https://www.jiloc.com/45780.html’}
{‘title’: ‘WordPress使用新浪图床后图片无法打开,如何将图片迁移到本地完整过程 图文教程’, ‘href’: ‘https://www.jiloc.com/45569.html’}{‘title’: ‘SVN 命令行使用总结’, ‘href’: ‘https://www.jiloc.com/46003.html’}
{‘title’: ‘Linux Windows MacOS 等系统中hosts的原理及作用’, ‘href’: ‘https://www.jiloc.com/44945.html’}{‘title’: ‘Vultr 在Linux系统中Nginx环境下如何建立基于域名的虚拟主机?’, ‘href’: ‘https://www.jiloc.com/45034.html’}
{‘title’: ‘基于PHP HTML5的网站测速源码’, ‘href’: ‘https://www.jiloc.com/45103.html’}
{‘title’: ‘在DEBIAN 9 或 UBUNTU 16.10 系统中配置LAMP环境’, ‘href’: ‘https://www.jiloc.com/45109.html’}
{‘title’: ‘PHP常用的文件操作函数整理’, ‘href’: ‘https://www.jiloc.com/45084.html’}
{‘title’: ‘Nginx常用屏蔽规则,让网站更安全’, ‘href’: ‘https://www.jiloc.com/45087.html’}
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{‘title’: ‘LNMP一键安装包(Linux+Nginx+Mysql/MariaDB+PHP)图文教程’, ‘href’: ‘https://www.jiloc.com/45782.html’}
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{‘title’: ‘[Vultr]VPS如何查看账单?怎么查看Vultr用了多少钱?’, ‘href’: ‘https://www.jiloc.com/44708.html’}{‘title’: ‘Linux系统中使用PHP脚本定时监控交换机端口流量并添加删除修改交换机规则控制流量’, ‘href’: ‘https://www.jiloc.com/45749.html’}
{‘title’: ‘阿里云云数据库RDS 首次用户可享半年10元优惠 云数据库MySQL首次购买专享福利’, ‘href’: ‘https://www.jiloc.com/45549.html’}{‘title’: ‘Vultr中Nginx环境下PHP安全设置 图文教程’, ‘href’: ‘https://www.jiloc.com/45010.html’}
{‘title’: ‘pip安装时ReadTimeoutError解决办法’, ‘href’: ‘https://www.jiloc.com/46183.html’}
{‘title’: ‘PHP代码检测web环境是否开启mod_rewrite模块’, ‘href’: ‘https://www.jiloc.com/44819.html’}
{‘title’: ‘php程序中代码前面加上@符号是什么意思?’, ‘href’: ‘https://www.jiloc.com/44816.html’}
{‘title’: ‘Docker安装Mariadb数据库 设置root密码 图文教程’, ‘href’: ‘https://www.jiloc.com/45880.html’}
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{‘title’: ‘WordPress 下载主题模板、更新报错 No working transports found解决办法’, ‘href’: ‘https://www.jiloc.com/44812.html’}{‘title’: ‘PHP开发中跳出多层循环方法’, ‘href’: ‘https://www.jiloc.com/45746.html’}
{‘title’: ‘Linode新上线加拿大多伦多Toronto, ON数据中心 注册即送10美元 2019 Linode优惠码 1核1G月付5美元起 按小时计费’, ‘href’: ‘https://www.jiloc.com/45545.html’}
{‘title’: ‘WordPress安装环境需要PHP与MySQL版本要求’, ‘href’: ‘https://www.jiloc.com/45057.html’}
{‘title’: ‘记一次PHP MySQL注入入侵’, ‘href’: ‘https://www.jiloc.com/45989.html’}{‘title’: ‘Vultr VPS 下 Windows 系统 服务器 中配置XAMPP环境搭建 WordPress博客图文教程’, ‘href’: ‘https://www.jiloc.com/44916.html’}
{‘title’: ‘WordPress插件开发 register_post_type 设定菜单 位置 结合 add_submenu_page 添加自定义设置页面’, ‘href’: ‘https://www.jiloc.com/45949.html’}
{‘title’: ‘Docker 安装 PHP 并配合 Nginx 运行 phpinfo’, ‘href’: ‘https://www.jiloc.com/45874.html’}
{‘title’: ‘[Vultr]Linux系统中iptables防火墙 常用规则整理’, ‘href’: ‘https://www.jiloc.com/45006.html’}{‘title’: ‘Vultr 优惠活动 注册即送$50美金,16个机房可选,按时计费’, ‘href’: ‘https://www.jiloc.com/45539.html’}
{‘title’: ‘Linux下使用Oneinstack Web环境一键升级到最新版本 图文教程’, ‘href’: ‘https://www.jiloc.com/45049.html’}
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{‘title’: ‘腾讯云 数字生态 – 每天五场秒杀 爆款1C1G云服务器首年99元/香港服务器199元’, ‘href’: ‘https://www.jiloc.com/45629.html’}
{‘title’: ‘零基础如何在Linux系统下搭建WordPress?’, ‘href’: ‘https://www.jiloc.com/45041.html’}{‘title’: ‘Vultr VPS 如何利用phpmyadmin建立数据库?’, ‘href’: ‘https://www.jiloc.com/44927.html’}
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{‘title’: ‘WordPress函数:wp_tag_cloud(标签云)详解和举例’, ‘href’: ‘https://www.jiloc.com/43834.html’}
{‘title’: ‘WordPress 使用 Cloudflare 免费SSL Flexible模式 导致重定向过多问题 解决方案’, ‘href’: ‘https://www.jiloc.com/43922.html’}{‘title’: ‘上海溯飏船舶物资有限公司’, ‘href’: ‘https://www.jiloc.com/43797.html’}
{‘title’: ‘WordPress 自动采集插件 wp-jpost 采集网站 zimuzu.tv 规则示例’, ‘href’: ‘https://www.jiloc.com/43733.html’}
{‘title’: ‘WordPress 自动采集插件 wp-jpost 采集网站 i4.cn 规则示例’, ‘href’: ‘https://www.jiloc.com/43738.html’}
time cost : 9.66 s

小结

不得不说python的采集速度是非常快的,总共就花了9.66秒。这个速度比PHP快乐N多倍。

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