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。

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’}
{‘title’: ‘CN2 GT(GIS)和CN2 GIA的区别办法’, ‘href’: ‘http://vpsum.com/45092.html’}
{‘title’: ‘php数组去除空值array_filter函数使用方法 代码实例’, ‘href’: ‘http://vpsum.com/45956.html’}{‘title’: ‘ThinkPHP 在Apache和Nginx中伪静态规则如何写?’, ‘href’: ‘http://vpsum.com/45030.html’}
{‘title’: ‘Windows 10启用Linux子系统(WSL) 图文教程’, ‘href’: ‘http://vpsum.com/45016.html’}
{‘title’: ‘LNMP一键安装包(Linux+Nginx+Mysql/MariaDB+PHP)图文教程’, ‘href’: ‘http://vpsum.com/45782.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’: ‘http://vpsum.com/45539.html’}
{‘title’: ‘ECharts图表点击柱状打开a链接’, ‘href’: ‘http://vpsum.com/45721.html’}
{‘title’: ‘解决WordPress全站开启https后的此网页包含过多的重定向问题’, ‘href’: ‘http://vpsum.com/45079.html’}
{‘title’: ‘WordPress正确引入JS和CSS文件方法’, ‘href’: ‘http://vpsum.com/44838.html’}
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{‘title’: ‘腾讯云如何更换服务器新的IP’, ‘href’: ‘http://vpsum.com/45770.html’}
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{‘title’: ‘jQuery获取DropDownList下拉框操作Javascript代码实例 代码总结’, ‘href’: ‘http://vpsum.com/46195.html’}
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{‘title’: ‘Debian9 Stretch如何更换apt源’, ‘href’: ‘http://vpsum.com/45645.html’}
{‘title’: ‘Visual Studio Code 终端中使用 SVN not found’, ‘href’: ‘http://vpsum.com/45996.html’}{‘title’: ‘新浪博客宣布“相册”功能下线:8月停止导出’, ‘href’: ‘http://vpsum.com/45564.html’}
{‘title’: ‘全能下载工具Motrix,支持BT、磁力链、百度网盘等资源’, ‘href’: ‘http://vpsum.com/45560.html’}
{‘title’: ‘WordPress 开源采集插件 WP-JPost V0.8 ChangeLog’, ‘href’: ‘http://vpsum.com/45076.html’}
{‘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’}
{‘title’: ‘WordPress 函数 :get_post_statuses 检索所有文章帖子状态值’, ‘href’: ‘http://vpsum.com/44831.html’}
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{‘title’: ‘如何使用SecureCRT实现命令行的上传下载文件(使用sz与rz命令)图文教程’, ‘href’: ‘http://vpsum.com/45756.html’}
{‘title’: ‘新浪图床近期不稳定论自建图床的重要性’, ‘href’: ‘http://vpsum.com/45556.html’}
{‘title’: ‘jQuery操作radio单选框Javascript代码实例 图文教程’, ‘href’: ‘http://vpsum.com/46192.html’}
{‘title’: ‘php生成GD图片不显示问题 解决办法 图文教程’, ‘href’: ‘http://vpsum.com/46189.html’}
{‘title’: ‘php下安装配置mbstring模块’, ‘href’: ‘http://vpsum.com/44824.html’}
{‘title’: ‘[Vultr]如何删除VPS/暂停VPS 图文教程’, ‘href’: ‘http://vpsum.com/44716.html’}
{‘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’}
{‘title’: ‘Ubuntu系统下BT宝塔面板新增快捷命令行处理 修改端口/解除域名绑定/重启重置密码等’, ‘href’: ‘http://vpsum.com/45062.html’}
{‘title’: ‘Git如何设置两个远程仓库地址?’, ‘href’: ‘http://vpsum.com/45637.html’}
{‘title’: ‘RamNode 云充值优惠 $5美金起充 新老客户都可以参与 额外赠送50%额度’, ‘href’: ‘http://vpsum.com/46180.html’}
{‘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’}
{‘title’: ‘[Vultr]Linux系统中iptables防火墙 常用规则整理’, ‘href’: ‘http://vpsum.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’: ‘http://vpsum.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’: ‘http://vpsum.com/45049.html’}
{‘title’: ‘RamNode新品OpenStack云服务器平台开通及主机方案 图文教程’, ‘href’: ‘http://vpsum.com/46161.html’}
{‘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’}
{‘title’: ‘搬瓦工VPS 补货DC9 CN2 GIA限量年付$39.99美金套餐’, ‘href’: ‘http://vpsum.com/46158.html’}{‘title’: ‘Vultr VPS 中 如何利用phpMyAdmin修改数据库密码?’, ‘href’: ‘http://vpsum.com/44923.html’}{‘title’: ‘[Vultr]发工单联系客服 图文教程’, ‘href’: ‘http://vpsum.com/44697.html’}
{‘title’: ‘[Vultr]如何删除服务器 停止计费’, ‘href’: ‘http://vpsum.com/44693.html’}
{‘title’: ‘MacOS系统中Mojave如何设置简单简短密码 解除密码最小长度4位’, ‘href’: ‘http://vpsum.com/45732.html’}
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{‘title’: ‘Docker中快速删除所有容器’, ‘href’: ‘http://vpsum.com/45868.html’}
{‘title’: ‘[Vultr]VPS支付方式 – AliPay支付宝/WeChat微信/Cred Card信用卡/PayPal贝宝等 以及付款区别’, ‘href’: ‘http://vpsum.com/45152.html’}
{‘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’}
{‘title’: ‘Windows VPS服务器快速修改默认3389端口提高安全性能’, ‘href’: ‘http://vpsum.com/44988.html’}
{‘title’: ‘[Vutlr]Linux Cetnos Debian 使用putty登陆 vultr VPS 服务器’, ‘href’: ‘http://vpsum.com/44661.html’}{‘title’: ‘PHP保留两位小数 四舍五入 代码实例’, ‘href’: ‘http://vpsum.com/46153.html’}{‘title’: ‘MacOS XAMPP 目录权限设置 图文教程’, ‘href’: ‘http://vpsum.com/44481.html’}
{‘title’: ‘WordPress安装时出现”查询SELECT wp_时,WordPress数据库发生Unknown column ‘wp_’ in ‘field list’错误”’, ‘href’: ‘http://vpsum.com/44792.html’}
{‘title’: ‘[Vultr]创建新的VPS服务器 图文教程’, ‘href’: ‘http://vpsum.com/44675.html’}
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{‘title’: ‘WordPress插件开发 在注册自定义文章后如何修改文章默认固定链接地址?’, ‘href’: ‘http://vpsum.com/45929.html’}{‘title’: ‘jQuery获取append添加html内容后的动态元素:live()和on()’, ‘href’: ‘http://vpsum.com/45857.html’}{‘title’: ‘阿里云Hi拼购活动 – 阿里云服务器优惠团购低至年付¥199元/老用户年付¥248元’, ‘href’: ‘http://vpsum.com/45619.html’}{‘title’: ‘Windows下如何查看系统版本位数 32|64位系统’, ‘href’:
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{‘title’: ‘WordPress 如何获取文章发表用户ID’, ‘href’: ‘http://vpsum.com/45976.html’}{‘title’: ‘[Vutlr]Linux Cetnos Debian 使用putty登陆 vultr VPS 服务器’, ‘href’: ‘http://vpsum.com/44661.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 Robots.txt 写法优化 示例’, ‘href’: ‘http://vpsum.com/43795.html’}
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{‘title’: ‘WordPress 添加标签’, ‘href’: ‘http://vpsum.com/44126.html’}
{‘title’: ‘WordPress 删除帖子’, ‘href’: ‘http://vpsum.com/44187.html’}
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{‘title’: ‘百度翻译 申请API Key 图文教程’, ‘href’: ‘http://vpsum.com/43783.html’}{‘title’: ‘WordPress 用户角色’, ‘href’: ‘http://vpsum.com/44066.html’}{‘title’: ‘WordPress 编辑标签’, ‘href’: ‘http://vpsum.com/44122.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 阅读设置’, ‘href’: ‘http://vpsum.com/44244.html’}{‘title’: ‘理解WordPress模板开发中无处不在的主循环’, ‘href’: ‘http://vpsum.com/43827.html’}
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{‘title’: ‘WordPress MYSQL 数据库及各表结构’, ‘href’: ‘http://vpsum.com/43823.html’}
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{‘title’: ‘WordPress 添加链接’, ‘href’: ‘http://vpsum.com/44112.html’}
{‘title’: ‘WordPress 媒体库’, ‘href’: ‘http://vpsum.com/44174.html’}
{‘title’: ‘WordPress分类列表函数:wp_list_categories用法及参数详解举例’, ‘href’: ‘http://vpsum.com/43867.html’}
{‘title’: ‘WordPress 版本更新’, ‘href’: ‘http://vpsum.com/43993.html’}
{‘title’: ‘MacOS 下修改 iTunes 备份文件路径 图文教程’, ‘href’: ‘http://vpsum.com/43900.html’}
{‘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’}
{‘title’: ‘WordPress 函数 wp_list_comments()使用回调函数自定义评论展示方式’, ‘href’: ‘http://vpsum.com/43821.html’}
{‘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’}
{‘title’: ‘WordPress 优化’, ‘href’: ‘http://vpsum.com/43963.html’}{‘title’: ‘WordPress 媒体设置’, ‘href’: ‘http://vpsum.com/44238.html’}
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{‘title’: ‘WordPress 删除链接’, ‘href’: ‘http://vpsum.com/44099.html’}{‘title’: ‘WordPress 插件开发 支持多语言 国际化 图文教程’, ‘href’: ‘http://vpsum.com/43890.html’}
{‘title’: ‘WordPress函数:load_plugin_textdomain 插件多语言 国际化 本地化’, ‘href’: ‘http://vpsum.com/43892.html’}{‘title’: ‘WordPress 固定链接设置’, ‘href’: ‘http://vpsum.com/44235.html’}{‘title’: ‘WordPress 编辑用户’, ‘href’: ‘http://vpsum.com/44057.html’}
{‘title’: ‘wordpress使用register_post_type 函数创建自定义文章类型’, ‘href’: ‘http://vpsum.com/43851.html’}{‘title’: ‘WordPress配置核心文件wp-config.php详解’, ‘href’: ‘http://vpsum.com/43809.html’}
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{‘title’: ‘WordPress 采集插件 WP-JPost 在Windows/Linux 系统环境下安装curl 采集 带ssl的https网站 图文教程’, ‘href’: ‘http://vpsum.com/43750.html’}{‘title’: ‘WordPress 用户删除’, ‘href’: ‘http://vpsum.com/44052.html’}
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{‘title’: ‘WordPress 个人档案’, ‘href’: ‘http://vpsum.com/44046.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函数:load_theme_textdomain()(载入本地化语言文件)’, ‘href’: ‘http://vpsum.com/43836.html’}
{‘title’: ‘WordPress 自动采集插件 wp-jpost 采集网站 vs.cm 规则示例’, ‘href’: ‘http://vpsum.com/43743.html’}{‘title’: ‘WordPress 自动采集插件 wp-jpost 采集网站 eastmoney.com 规则示例’, ‘href’: ‘http://vpsum.com/43802.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’}
{‘title’: ‘WordPress 自动采集插件 wp-jpost 采集网站 i4.cn 规则示例’, ‘href’: ‘http://vpsum.com/43738.html’}
time cost : 9.66 s

Python 基础 网页爬虫 代码实例

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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