Python 基础网页爬虫代码实例

Python现在很火，云聚合最近也想学习一下。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。

Table of Contents

目的

采集云聚合博客的列表，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 python
# 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 = 'http://vpsum.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’: ‘http://vpsum.com/46018.html’}
{‘title’: ‘create table select from 和 insert into table select from区别’, ‘href’: ‘http://vpsum.com/46014.html’}
{‘title’: ‘Discuz官方论坛关闭发言权’, ‘href’: ‘http://vpsum.com/45806.html’}
{‘title’: ‘系统重启Reboot 后 Docker服务及容器自动启动设置’, ‘href’: ‘http://vpsum.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’: ‘http://vpsum.com/45725.html’}{‘title’: ‘密码保护：WordPress 采集插件 wp-jpost 网站 8023mi.com 规则示例’, ‘href’: ‘http://vpsum.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’: ‘http://vpsum.com/44843.html’}
{‘title’: ‘LNMP1.6正式版已更新已支持PHP7.3’, ‘href’: ‘http://vpsum.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’: ‘http://vpsum.com/45569.html’}{‘title’: ‘SVN 命令行使用总结’, ‘href’: ‘http://vpsum.com/46003.html’}
{‘title’: ‘Linux Windows MacOS 等系统中hosts的原理及作用’, ‘href’: ‘http://vpsum.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’: ‘http://vpsum.com/45034.html’}
{‘title’: ‘基于PHP HTML5的网站测速源码’, ‘href’: ‘http://vpsum.com/45103.html’}
{‘title’: ‘在DEBIAN 9 或 UBUNTU 16.10 系统中配置LAMP环境’, ‘href’: ‘http://vpsum.com/45109.html’}
{‘title’: ‘PHP常用的文件操作函数整理’, ‘href’: ‘http://vpsum.com/45084.html’}
{‘title’: ‘Nginx常用屏蔽规则，让网站更安全’, ‘href’: ‘http://vpsum.com/45087.html’}
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{‘title’: ‘Windows 10启用Linux子系统（WSL）图文教程’, ‘href’: ‘http://vpsum.com/45016.html’}
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{‘title’: ‘Vultr 优惠活动注册即送$50美金,16个机房可选,按时计费’, ‘href’: ‘http://vpsum.com/45539.html’}
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{‘title’: ‘[腾讯云]四月每天三场秒杀优惠活动云服务器/数据库/短信’, ‘href’: ‘http://vpsum.com/45067.html’}
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{‘title’: ‘php下安装配置mbstring模块’, ‘href’: ‘http://vpsum.com/44824.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’: ‘http://vpsum.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’: ‘http://vpsum.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’: ‘http://vpsum.com/45549.html’}{‘title’: ‘Vultr中Nginx环境下PHP安全设置图文教程’, ‘href’: ‘http://vpsum.com/45010.html’}
{‘title’: ‘pip安装时ReadTimeoutError解决办法’, ‘href’: ‘http://vpsum.com/46183.html’}
{‘title’: ‘PHP代码检测web环境是否开启mod_rewrite模块’, ‘href’: ‘http://vpsum.com/44819.html’}
{‘title’: ‘php程序中代码前面加上@符号是什么意思？’, ‘href’: ‘http://vpsum.com/44816.html’}
{‘title’: ‘Docker安装Mariadb数据库设置root密码图文教程’, ‘href’: ‘http://vpsum.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’: ‘http://vpsum.com/44812.html’}{‘title’: ‘PHP开发中跳出多层循环方法’, ‘href’: ‘http://vpsum.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’: ‘http://vpsum.com/45545.html’}
{‘title’: ‘WordPress安装环境需要PHP与MySQL版本要求’, ‘href’: ‘http://vpsum.com/45057.html’}
{‘title’: ‘记一次PHP MySQL注入入侵’, ‘href’: ‘http://vpsum.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’: ‘http://vpsum.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’: ‘http://vpsum.com/45949.html’}
{‘title’: ‘Docker 安装 PHP 并配合 Nginx 运行 phpinfo’, ‘href’: ‘http://vpsum.com/45874.html’}
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{‘title’: ‘[Vultr]VPS 流量用完了怎么办？’, ‘href’: ‘http://vpsum.com/44704.html’}{‘title’: ‘WordPress 插件开发如何一次性输入多个标签Tags搜索文章内容？’, ‘href’: ‘http://vpsum.com/45944.html’}
{‘title’: ‘PHP如何登录连接TELNET并执行交换机命令类图文教程’, ‘href’: ‘http://vpsum.com/45742.html’}
{‘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’: ‘http://vpsum.com/45629.html’}
{‘title’: ‘零基础如何在Linux系统下搭建WordPress？’, ‘href’: ‘http://vpsum.com/45041.html’}{‘title’: ‘Vultr VPS 如何利用phpmyadmin建立数据库？’, ‘href’: ‘http://vpsum.com/44927.html’}
{‘title’: ‘WordPress中安装插件需要ftp怎么办？’, ‘href’: ‘http://vpsum.com/44809.html’}
{‘title’: ‘Docker 安装 Nginx 映射本地文件多虚拟主机图文教程’, ‘href’: ‘http://vpsum.com/45860.html’}{‘title’: ‘Vultr VPS 安装了Debian系统后如何修改iptables规则配置图文教程’, ‘href’: ‘http://vpsum.com/45736.html’}{‘title’: ‘[Enoctus] VPS 月付$10/无限流量/1GB内存/24GB SSD 硬盘’, ‘href’: ‘http://vpsum.com/44997.html’}{‘title’: ‘搬瓦工问答整理’, ‘href’: ‘http://vpsum.com/45165.html’}
{‘title’: ‘腾讯云限时秒杀活动 – 仅限新人云服务器低至198元一年’, ‘href’: ‘http://vpsum.com/45981.html’}
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{‘title’: ‘插件实现WordPress上传图片单独存到至腾讯云COS对象存储’, ‘href’: ‘http://vpsum.com/45135.html’}
{‘title’: ‘[WordPress] 批量删除所有文章的特色图片函数代码’, ‘href’: ‘http://vpsum.com/44912.html’}
{‘title’: ‘WordPress 插件开发如何新建自定义页面？’, ‘href’: ‘http://vpsum.com/45934.html’}{‘title’: ‘[Vultr]是怎么收费的？Vultr计时收费模式详解’, ‘href’: ‘http://vpsum.com/44682.html’}
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{‘title’: ‘WordPress 在插件或模板开发中使用 session 图文教程’, ‘href’: ‘http://vpsum.com/43902.html’}{‘title’: ‘WordPress 安装插件’, ‘href’: ‘http://vpsum.com/44078.html’}
{‘title’: ‘WordPress 窗口管理’, ‘href’: ‘http://vpsum.com/44020.html’}{‘title’: ‘WordPress 编辑帖子’, ‘href’: ‘http://vpsum.com/44193.html’}
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{‘title’: ‘WordPress函数：add meta box（自定义添加Meta模块）’, ‘href’: ‘http://vpsum.com/43846.html’}
{‘title’: ‘WordPress 删除页面’, ‘href’: ‘http://vpsum.com/44131.html’}{‘title’: ‘WordPress 插件定制’, ‘href’: ‘http://vpsum.com/44073.html’}
{‘title’: ‘WordPress 仪表盘’, ‘href’: ‘http://vpsum.com/44252.html’}
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{‘title’: ‘WordPress 背景’, ‘href’: ‘http://vpsum.com/44014.html’}
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{‘title’: ‘WordPress 主题制作基本模版文件以及基本函数详解’, ‘href’: ‘http://vpsum.com/43793.html’}
{‘title’: ‘WordPress 添加标签’, ‘href’: ‘http://vpsum.com/44126.html’}
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{‘title’: ‘WordPress 主机转移’, ‘href’: ‘http://vpsum.com/44005.html’}{‘title’: ‘WordPress 删除标签’, ‘href’: ‘http://vpsum.com/44116.html’}
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{‘title’: ‘WordPress 版本更新’, ‘href’: ‘http://vpsum.com/43993.html’}
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{‘title’: ‘WordPress 开源采集插件 WP-JPost V0.6.0 ChangeLog’, ‘href’: ‘http://vpsum.com/44314.html’}{‘title’: ‘WordPress 讨论设置’, ‘href’: ‘http://vpsum.com/44241.html’}
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{‘title’: ‘新浪免费图床微博相册使用方法图文教程’, ‘href’: ‘http://vpsum.com/43766.html’}{‘title’: ‘WordPress 垃圾邮件防护’, ‘href’: ‘http://vpsum.com/43989.html’}
{‘title’: ‘WordPress 备份和恢复’, ‘href’: ‘http://vpsum.com/43979.html’}
{‘title’: ‘WordPress 添加用户’, ‘href’: ‘http://vpsum.com/44065.html’}
{‘title’: ‘wordpress函数：get_permalink()获取文章页面的固定链接’, ‘href’: ‘http://vpsum.com/43865.html’}
{‘title’: ‘WordPress 编辑链接’, ‘href’: ‘http://vpsum.com/44105.html’}{‘title’: ‘BT宝塔面板磁盘爆满处理方法图文教程’, ‘href’: ‘http://vpsum.com/43896.html’}{‘title’: ‘WordPress 添加媒体’, ‘href’: ‘http://vpsum.com/44167.html’}
{‘title’: ‘WordPress 自动采集插件 wp-jpost 采集 Discuz论坛网站 hostloc.com 规则示例’, ‘href’: ‘http://vpsum.com/44312.html’}
{‘title’: ‘WordPress 用户照片’, ‘href’: ‘http://vpsum.com/44061.html’}{‘title’: ‘WordPress 函数：register_sidebar()创建主题侧边栏’, ‘href’: ‘http://vpsum.com/43819.html’}{‘title’: ‘WordPress函数：wp_get_archives根据日期显示日志归档详解举例’, ‘href’: ‘http://vpsum.com/43863.html’}
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{‘title’: ‘WordPress函数：add_theme_page()后台添加设置页面’, ‘href’: ‘http://vpsum.com/43842.html’}
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{‘title’: ‘WordPress 自动采集插件 wp-jpost 采集网站 zimuzu.tv 规则示例’, ‘href’: ‘http://vpsum.com/43733.html’}
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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。

目的

代码实例

运行结果

小结

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