Python 基础 网页爬虫 代码实例

标签:,
来源: 老季博客
日期: 2019-8-29
作者: 腾讯云/服务器VPS推荐评测/Vultr
阅读数: 45

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 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 = 'https://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://jiloc.com/46018.html’}
{‘title’: ‘create table select from 和 insert into table select from区别’, ‘href’: ‘https://jiloc.com/46014.html’}
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{‘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://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://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://jiloc.com/44843.html’}
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{‘title’: ‘WordPress函数:add_theme_page()后台添加设置页面’, ‘href’: ‘https://jiloc.com/43842.html’}
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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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