一、介绍
BeautifulSoup是一个可以从HTML或XML文件中提取数据的Python库。
二、快速开始
给定html文档,产生BeautifulSoup对象
from bs4 import BeautifulSoup
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>
"""
soup = BeautifulSoup(html_doc,'lxml')
输出完整文本
print(soup.prettify())
<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 class="sister" href="http://example.com/elsie" id="link1">
Elsie
</a>
,
<a class="sister" href="http://example.com/lacie" id="link2">
Lacie
</a>
and
<a class="sister" href="http://example.com/tillie" id="link3">
Tillie
</a>
;
and they lived at the bottom of a well.
</p>
<p class="story">
...
</p>
</body>
</html>
浏览结构化数据
print(soup.title) #<title>标签及内容
print(soup.title.name) #<title>name属性
print(soup.title.string) #<title>内的字符串
print(soup.title.parent.name) #<title>的父标签name属性(head)
print(soup.p) # 第一个<p></p>
print(soup.p['class']) #第一个<p></p>的class
print(soup.a) # 第一个<a></a>
print(soup.find_all('a')) # 所有<a></a>
print(soup.find(id="link3")) # 所有id='link3'的标签
<title>The Dormouse's story</title>
title
The Dormouse's story
head
<p class="title"><b>The Dormouse's story</b></p>
['title']
<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>
[<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>, <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>, <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>]
<a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>
找出所有<a>标签内的链接
for link in soup.find_all('a'):
print(link.get('href'))
http://example.com/elsie
http://example.com/lacie
http://example.com/tillie
获得所有文字内容
print(soup.get_text())
The Dormouse's story
The Dormouse's story
Once upon a time there were three little sisters; and their names were
Elsie,
Lacie and
Tillie;
and they lived at the bottom of a well.
...