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什么是BeautifulSoup
靈活又方便的網(wǎng)頁(yè)解析庫(kù)，處理高效，支持多種解析器。利用它不用編寫正則表達(dá)式就可以方便實(shí)現(xiàn)網(wǎng)頁(yè)信息的提取
BeautifulSoup的安裝

pip install beautifulsoup4

BeautifulSoup用法詳解

解析庫(kù)

解析器	使用方法	優(yōu)勢(shì)	劣勢(shì)
Python標(biāo)準(zhǔn)庫(kù)	BeautifulSoup(markup,"html.parser")	Python的內(nèi)置標(biāo)準(zhǔn)庫(kù)、執(zhí)行速度適中，文檔容錯(cuò)能力強(qiáng)	Python2.7.3 or 3.2.2之前的版本中文容錯(cuò)能力差
lxml HTML 解析器	BeautifulSoup(markup, "lxml")	速度快、文檔容錯(cuò)能力強(qiáng)	需要安裝C語(yǔ)言庫(kù)
lxml XML 解析器	BeautifulSoup(markup, "xml")	速度快、唯一支持XML的解析器	需要安裝C語(yǔ)言庫(kù)
html5lib	BeautifulSoup(markup, "html5lib")	最好的容錯(cuò)性、以瀏覽器的方式解析文檔，生成HTML5格式的文檔	速度慢、不依賴外部擴(kuò)展

基本使用

## 標(biāo)簽選擇器
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  class="sister" id="link1"><!-- Elsie --></a>,
<a  class="sister" id="link2">Lacie</a> and
<a  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)

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  class="sister" id="link1"><!-- Elsie --></a>,
<a  class="sister" id="link2">Lacie</a> and
<a  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)

## 獲取名稱
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  class="sister" id="link1"><!-- Elsie --></a>,
<a  class="sister" id="link2">Lacie</a> and
<a  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)

## 獲取屬性
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  class="sister" id="link1"><!-- Elsie --></a>,
<a  class="sister" id="link2">Lacie</a> and
<a  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'])

## 獲取內(nèi)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  class="sister" id="link1"><!-- Elsie --></a>,
<a  class="sister" id="link2">Lacie</a> and
<a  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)

## 嵌套選擇
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  class="sister" id="link1"><!-- Elsie --></a>,
<a  class="sister" id="link2">Lacie</a> and
<a  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)

## 子節(jié)點(diǎn)和子孫節(jié)點(diǎn)
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  class="sister" id="link1">
                <span>Elsie</span>
            </a>
            <a  class="sister" id="link2">Lacie</a> 
            and
            <a  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)

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  class="sister" id="link1">
                <span>Elsie</span>
            </a>
            <a  class="sister" id="link2">Lacie</a> 
            and
            <a  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)

## 父節(jié)點(diǎn)和祖先節(jié)點(diǎn)
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  class="sister" id="link1">
                <span>Elsie</span>
            </a>
            <a  class="sister" id="link2">Lacie</a> 
            and
            <a  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)

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  class="sister" id="link1">
                <span>Elsie</span>
            </a>
            <a  class="sister" id="link2">Lacie</a> 
            and
            <a  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)))

## 兄弟節(jié)點(diǎn)
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  class="sister" id="link1">
                <span>Elsie</span>
            </a>
            <a  class="sister" id="link2">Lacie</a> 
            and
            <a  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)))

## 標(biāo)準(zhǔn)選擇器
## find_all( name , attrs , recursive , text , **kwargs )
## 可以根據(jù)簽名、屬性、內(nèi)容查找文檔
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]))

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'))

## 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'}))

## 
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'))

## 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'))

## find( name , attrs , recursive , text , **kwargs )
## find返回單個(gè)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'))

find_parents() find_parent()

find_parents()返回所有祖先節(jié)點(diǎn)，find_parent()返回直接父節(jié)點(diǎn)。

find_next_siblings() find_next_sibling()

find_next_siblings()返回后面所有兄弟節(jié)點(diǎn)，find_next_sibling()返回后面第一個(gè)兄弟節(jié)點(diǎn)。

find_previous_siblings() find_previous_sibling()

find_previous_siblings()返回前面所有兄弟節(jié)點(diǎn)，find_previous_sibling()返回前面第一個(gè)兄弟節(jié)點(diǎn)。

find_all_next() find_next()

find_all_next()返回節(jié)點(diǎn)后所有符合條件的節(jié)點(diǎn), find_next()返回第一個(gè)符合條件的節(jié)點(diǎn)

find_all_previous() 和 find_previous()

find_all_previous()返回節(jié)點(diǎn)后所有符合條件的節(jié)點(diǎn), find_previous()返回第一個(gè)符合條件的節(jié)點(diǎn)

css選擇器

## 基本使用
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]))

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'))

## 獲取屬性
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'])

## 獲取內(nèi)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())

總結(jié)

推薦使用lxml解析庫(kù)，必要時(shí)使用html.parser
標(biāo)簽選擇篩選功能弱但是速度快
建議使用find()、find_all() 查詢匹配單個(gè)結(jié)果或者多個(gè)結(jié)果
如果對(duì)CSS選擇器熟悉建議使用select()
記住常用的獲取屬性和文本值的方法

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BeautifulSoup庫(kù)介紹

BeautifulSoup庫(kù)介紹

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BeautifulSoup庫(kù)介紹

相關(guān)閱讀更多精彩內(nèi)容

友情鏈接更多精彩內(nèi)容

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