从 BS4 迁移到 lxml 指南！

Warning

本指南的所有内容仅在 Python 3 下通过测试，不保证在 Python 2 下依然可行！

术语标准

在继续阅读本指南之前，我们应该建立一个关于 HTML 基本术语的共识，一般来说：

MDN element
MDN attribute

以上图片引用自 MDN

使用以下 HTML 代码生成 bs4.BeautifulSoup 对象和 lxml.etree._Element 对象:

html_doc = """
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="title"><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>
"""

from lxml import etree
ehtml = etree.HTML(html_doc)

from bs4 import BeautifulSoup
soup = BeautifulSoup(html_doc, 'html.parser')

Contents:

Indices and tables