BeautifulSoup的基本用法
Beautiful Soup 是一个可以从HTML或XML文件中提取数据的Python库.它能够通过你喜欢的转换器实现惯用的文档导航,查找,修改文档的方式。
它是一个灵活又方便的网页解析库，处理高效，支持多种解析器。
利用它就不用编写正则表达式也能方便的实现网页信息的抓取。
通常人们把 beautifulSoup 叫作“美味的汤，绿色的浓汤”，简称：美丽(味)汤
它的官方文档：https://www.crummy.com/software/BeautifulSoup/bs4/doc/index.zh.html (中)
https://www.crummy.com/software/BeautifulSoup/bs4/doc/ (英)
安装
快速安装
pip install beautifulsoup4 或 easy_install BeautifulSoup4
解析库
Beautiful Soup支持Python标准库中的HTML解析器,还支持一些第三方的解析器，如果我们不安装它，则 Python 会使用 Python默认的解析器，lxml 解析器更加强大，速度更快，推荐安装。
# -*- coding:utf-8 -*- from bs4 import BeautifulSoup html = """haha,The Dormouse's story</tittle></head> <body> <p class="title" name="dromouse"><b>The Dormouse's story</b></p> <p class="story">Once upon a time there were three little sisters; and their names were <a href="http://example.com/elsie" class="sister" id="link1"><!-- Elsie --></a>, <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>; and they lived at the bottom of a well.</p> <p class="story">...</p> </span><span style="color: rgba(128, 0, 0, 1)">"""</span><span style="color: rgba(0, 0, 0, 1)"> soup </span>= BeautifulSoup(html, <span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">lxml</span><span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(0, 0, 0, 1)">) </span><span style="color: rgba(0, 0, 255, 1)">print</span>(soup) <span style="color: rgba(0, 128, 0, 1)">#</span><span style="color: rgba(0, 128, 0, 1)"> 输出解析的html对象</span> <span style="color: rgba(0, 0, 255, 1)">print</span>(soup.prettify()) <span style="color: rgba(0, 128, 0, 1)">#</span><span style="color: rgba(0, 128, 0, 1)"> 格式化</span> <span style="color: rgba(0, 0, 255, 1)">print</span>(soup.title) <span style="color: rgba(0, 128, 0, 1)">#</span><span style="color: rgba(0, 128, 0, 1)"> 输出标题<title>，eg: <title>haha,The Dormouse's story print(soup.title.string) # 输出title标题的内容字符串 print(soup.title.parent.name) # 输出节点父节点的名字</span> <span style="color: rgba(0, 0, 255, 1)">print</span>(soup.find_all(<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">a</span><span style="color: rgba(128, 0, 0, 1)">'</span>)) <span style="color: rgba(0, 128, 0, 1)">#</span><span style="color: rgba(0, 128, 0, 1)"> 输出所有标签<a>组成的list</span> <span style="color: rgba(0, 0, 255, 1)">print</span>(soup.find(id=<span style="color: rgba(128, 0, 0, 1)">'</span><span style="color: rgba(128, 0, 0, 1)">link3</span><span style="color: rgba(128, 0, 0, 1)">'</span>)) <span style="color: rgba(0, 128, 0, 1)">#</span><span style="color: rgba(0, 128, 0, 1)"> 返回包含id='link3'的标签所有内容</span></pre> </div> <!--conend--> <div class="p-2"></div> <div class="arcinfo my-3 fs-7 text-center"> <a href='/t/etagid8-0.html' class='tagbtn' target='_blank'>Python</a> </div> <div class="p-2"></div> </div> <div class="p-2"></div> <!--xg--> <div class="lbox p-4 shadow-sm rounded-3"> <div class="boxtitle"><h2 class="fs-4">相关</h2></div> <hr> <div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-566513.html">学习《Python编程从入门到实践》PDF+代码训练</a></h3> <div class="ltag fs-8 d-none d-lg-block"> </div> </div> </div><div class="row g-0 py-2 border-bottom align-items-center"> <div class="col-7 col-lg-11 border-lg-end"> <h3 class="fs-6 mb-0 mb-lg-2"><a href="/a/1-566439.html">python-----面向对象简单理解</a></h3> <div class="ltag fs-8 d-none 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