解析库

解析器 使用方法 优势 劣势
Python标准库 BeautifulSoup(markup, "html.parser") Python的内置标准库、执行速度适中 、文档容错能力强 Python 2.7.3 or 3.2.2)前的版本中文容错能力差
lxml HTML 解析器 BeautifulSoup(markup, "lxml") 速度快、文档容错能力强 需要安装C语言库
lxml XML 解析器 BeautifulSoup(markup, "xml") 速度快、唯一支持XML的解析器 需要安装C语言库
html5lib BeautifulSoup(markup, "html5lib") 最好的容错性、以浏览器的方式解析文档、生成HTML5格式的文档 速度慢、不依赖外部扩展

基本使用

html = """
<html><head><title>The Dormouse's story</title></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>
"""
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.prettify())
print(soup.title.string)# 输出
<html><head><title>The Dormouse's story</title></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 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>
The Dormouse's story

标签选择器

选择元素

html = """
<html><head><title>The Dormouse's story</title></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>
"""
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.title)
print(type(soup.title))
print(soup.head)
print(soup.p)# 输出
<title>The Dormouse's story</title>
<class 'bs4.element.Tag'>
<head><title>The Dormouse's story</title></head>
<p class="title" name="dromouse"><b>The Dormouse's story</b></p>

获取名称

html = """
<html><head><title>The Dormouse's story</title></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>
"""
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.title.name)# 输出
title

获取属性

html = """
<html><head><title>The Dormouse's story</title></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>
"""
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.p.attrs['name'])
print(soup.p['name'])# 输出
dromouse
dromouse

获取内容

html = """
<html><head><title>The Dormouse's story</title></head>
<body>
<p clss="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>
"""
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.p.string)# 输出
The Dormouse's story

嵌套选择

html = """
<html><head><title>The Dormouse's story</title></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>
"""
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.head.title.string)# 输出
The Dormouse's story

子节点和子孙节点

html = """
<html><head><title>The Dormouse's story</title></head><body><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"><span>Elsie</span></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 bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.p.contents)# 输出
['\n            Once upon a time there were three little sisters; and their names were\n            ', <a class="sister" href="http://example.com/elsie" id="link1">
<span>Elsie</span>
</a>, '\n', <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>, ' \n            and\n            ', <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>, '\n            and they lived at the bottom of a well.\n        ']

html = """
<html><head><title>The Dormouse's story</title></head><body><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"><span>Elsie</span></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 bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.p.children)
for i, child in enumerate(soup.p.children):print(i, child)# 输出
<list_iterator object at 0x1064f7dd8>
0 Once upon a time there were three little sisters; and their names were1 <a class="sister" href="http://example.com/elsie" id="link1">
<span>Elsie</span>
</a>
2 3 <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>
4  and5 <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>
6 and they lived at the bottom of a well.

html = """
<html><head><title>The Dormouse's story</title></head><body><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"><span>Elsie</span></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 bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.p.descendants)
for i, child in enumerate(soup.p.descendants):print(i, child)# 输出
<generator object descendants at 0x10650e678>
0 Once upon a time there were three little sisters; and their names were1 <a class="sister" href="http://example.com/elsie" id="link1">
<span>Elsie</span>
</a>
2 3 <span>Elsie</span>
4 Elsie
5 6 7 <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>
8 Lacie
9  and10 <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>
11 Tillie
12 and they lived at the bottom of a well.

父节点和祖先节点

html = """
<html><head><title>The Dormouse's story</title></head><body><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"><span>Elsie</span></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 bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.a.parent)# 输出
<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">
<span>Elsie</span>
</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>

html = """
<html><head><title>The Dormouse's story</title></head><body><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"><span>Elsie</span></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 bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(list(enumerate(soup.a.parents)))# 输出
[(0, <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">
<span>Elsie</span>
</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>), (1, <body>
<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">
<span>Elsie</span>
</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>), (2, <html>
<head>
<title>The Dormouse's story</title>
</head>
<body>
<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">
<span>Elsie</span>
</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>), (3, <html>
<head>
<title>The Dormouse's story</title>
</head>
<body>
<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">
<span>Elsie</span>
</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>)]

兄弟节点

html = """
<html><head><title>The Dormouse's story</title></head><body><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"><span>Elsie</span></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 bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(list(enumerate(soup.a.next_siblings)))
print(list(enumerate(soup.a.previous_siblings)))# 输出
[(0, '\n'), (1, <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>), (2, ' \n            and\n            '), (3, <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>), (4, '\n            and they lived at the bottom of a well.\n        ')]
[(0, '\n            Once upon a time there were three little sisters; and their names were\n            ')]

标准选择器

find_all( name , attrs , recursive , text , **kwargs )

可根据标签名、属性、内容查找文档

name

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.find_all('ul'))
print(type(soup.find_all('ul')[0]))# 输出
[<ul class="list" id="list-1">
<li class="element">Foo</li>
<li class="element">Bar</li>
<li class="element">Jay</li>
</ul>, <ul class="list list-small" id="list-2">
<li class="element">Foo</li>
<li class="element">Bar</li>
</ul>]
<class 'bs4.element.Tag'>

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
for ul in soup.find_all('ul'):print(ul.find_all('li'))# 输出
[<li class="element">Foo</li>, <li class="element">Bar</li>, <li class="element">Jay</li>]
[<li class="element">Foo</li>, <li class="element">Bar</li>]

attrs

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1" name="elements"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.find_all(attrs={'id': 'list-1'}))
print(soup.find_all(attrs={'name': 'elements'}))# 输出
[<ul class="list" id="list-1" name="elements">
<li class="element">Foo</li>
<li class="element">Bar</li>
<li class="element">Jay</li>
</ul>]
[<ul class="list" id="list-1" name="elements">
<li class="element">Foo</li>
<li class="element">Bar</li>
<li class="element">Jay</li>
</ul>]

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.find_all(id='list-1'))
print(soup.find_all(class_='element'))# 输出
[<ul class="list" id="list-1">
<li class="element">Foo</li>
<li class="element">Bar</li>
<li class="element">Jay</li>
</ul>]
[<li class="element">Foo</li>, <li class="element">Bar</li>, <li class="element">Jay</li>, <li class="element">Foo</li>, <li class="element">Bar</li>]

text

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.find_all(text='Foo'))# 输出
['Foo', 'Foo']

find( name , attrs , recursive , text , **kwargs )

find返回单个元素，find_all返回所有元素

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.find('ul'))
print(type(soup.find('ul')))
print(soup.find('page'))# 输出
<ul class="list" id="list-1">
<li class="element">Foo</li>
<li class="element">Bar</li>
<li class="element">Jay</li>
</ul>
<class 'bs4.element.Tag'>
None

find_parents() find_parent()

find_parents()返回所有祖先节点，find_parent()返回直接父节点。

find_next_siblings() find_next_sibling()

find_next_siblings()返回后面所有兄弟节点，find_next_sibling()返回后面第一个兄弟节点。

find_previous_siblings() find_previous_sibling()

find_previous_siblings()返回前面所有兄弟节点，find_previous_sibling()返回前面第一个兄弟节点。

find_all_next() find_next()

find_all_next()返回节点后所有符合条件的节点, find_next()返回第一个符合条件的节点

find_all_previous() 和 find_previous()

find_all_previous()返回节点后所有符合条件的节点, find_previous()返回第一个符合条件的节点

CSS选择器

通过select()直接传入CSS选择器即可完成选择：

. 代表类名        # 代表id       啥也不写是 标签名

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
print(soup.select('.panel .panel-heading'))
print(soup.select('ul li'))
print(soup.select('#list-2 .element'))
print(type(soup.select('ul')[0]))# 输出
[<div class="panel-heading">
<h4>Hello</h4>
</div>]
[<li class="element">Foo</li>, <li class="element">Bar</li>, <li class="element">Jay</li>, <li class="element">Foo</li>, <li class="element">Bar</li>]
[<li class="element">Foo</li>, <li class="element">Bar</li>]
<class 'bs4.element.Tag'>

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
for ul in soup.select('ul'):print(ul.select('li'))# 输出
[<li class="element">Foo</li>, <li class="element">Bar</li>, <li class="element">Jay</li>]
[<li class="element">Foo</li>, <li class="element">Bar</li>]

获取属性

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
for ul in soup.select('ul'):print(ul['id'])print(ul.attrs['id'])# 输出
list-1
list-1
list-2
list-2

获取内容

html='''
<div class="panel"><div class="panel-heading"><h4>Hello</h4></div><div class="panel-body"><ul class="list" id="list-1"><li class="element">Foo</li><li class="element">Bar</li><li class="element">Jay</li></ul><ul class="list list-small" id="list-2"><li class="element">Foo</li><li class="element">Bar</li></ul></div>
</div>
'''
from bs4 import BeautifulSoup
soup = BeautifulSoup(html, 'lxml')
for li in soup.select('li'):print(li.get_text())# 输出
Foo
Bar
Jay
Foo
Bar

总结

  • 推荐使用lxml解析库，必要时使用html.parser
  • 标签选择筛选功能弱但是速度快
  • 建议使用find()、find_all() 查询匹配单个结果或者多个结果
  • 如果对CSS选择器熟悉建议使用select()
  • 记住常用的获取属性和文本值的方法

转载于:https://www.cnblogs.com/panlei3707/p/8745097.html

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