Python爬蟲【解析庫之beautifulsoup】

阿新 • • 發佈：2018-08-27

close **kwargs contents pip and lac 代碼 ide num

解析庫的安裝

pip3 install beautifulsoup4

初始化 BeautifulSoup(str,"解析庫")

from bs4 import BeautifulSoup

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>

</div>
‘‘‘

soup = BeautifulSoup(html,"lxml") # soup = BeautifulSoup(html,"html.parser")

標簽選擇器

選擇元素 soup.E

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)

"""
打印結果:
<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>
"""

選擇元素

獲取名稱 soup.E.name

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) # title

獲取名稱

獲取屬性 soup.E.attrs[ ] or soup.E[ ]

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‘])
"""
dromouse
dromouse
"""

獲取屬性

獲取內容 soup.E.string

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)
"""
The Dormouse‘s story
"""

獲取內容

嵌套選擇 soup.E.E

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)
"""
The Dormouse‘s story
"""

View Code

子節點 soup.E.contents

 1 html = """
 2 <html>
 3     <head>
 4         <title>The Dormouse‘s story</title>
 5     </head>
 6     <body>
 7         <p class="story">
 8             Once upon a time there were three little sisters; and their names were
 9             <a href="http://example.com/elsie" class="sister" id="link1">
10                 <span>Elsie</span>
11             </a>
12             <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> 
13             and
14             <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>
15             and they lived at the bottom of a well.
16         </p>
17         <p class="story">...</p>
18 """
19 from bs4 import BeautifulSoup
20 soup = BeautifulSoup(html, ‘lxml‘)
21 print(soup.p.contents)
22 """
23 [‘\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">
24 <span>Elsie</span>
25 </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        ‘]
26 
27 """

View Code

子節點 soup.E.children

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)
"""
<list_iterator object at 0x00B116D0>
0 
            Once upon a time there were three little sisters; and their names were
            
1 <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  
            and
            
5 <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>
6 
            and they lived at the bottom of a well.
"""

View Code

子孫節點 soup.E.descendants 包括標簽裏面的文本都屬於

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)
"""
<generator object descendants at 0x03EBD420>
0 
            Once upon a time there were three little sisters; and their names were
            
1 <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  
            and
            
10 <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>
11 Tillie
12 
            and they lived at the bottom of a well.
"""

View Code

父節點 soup.E.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 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)

View Code

祖先節點 soup.E.parents

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)))

View Code

兄弟節點 soup.E.next_siblings soup.E.previous_siblings

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)))

View Code

標準選擇器

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

可根據標簽名、屬性、內容查找文檔

標簽名獲取 soup.find_all(‘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‘))

View Code

屬性獲取 soup.find_all(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‘}))

View Code

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‘))

第二種

文本內容獲取

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‘))

View Code

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

find返回單個元素，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()返回所有祖先節點，find_parent()返回直接父節點。

find_next_siblings() find_next_sibling()

find_next_siblings()返回後面所有兄弟節點，find_next_sibling()返回後面第一個兄弟節點。

find_previous_siblings() find_previous_sibling()

find_previous_siblings()返回前面所有兄弟節點，find_previous_sibling()返回前面第一個兄弟節點。

find_all_next() find_next()

find_all_next()返回節點後所有符合條件的節點, find_next()返回第一個符合條件的節點

find_all_previous() 和 find_previous()

find_all_previous()返回節點後所有符合條件的節點, find_previous()返回第一個符合條件的節點

CSS選擇器

通過select()直接傳入CSS選擇器即可完成選擇 soup.select(css選擇器)

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]))

View Code

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‘))

View Code

獲取屬性 E.attrs[] or E[]

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‘])

View Code

獲取內容 get_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‘)
for li in soup.select(‘li‘):
    print(li.get_text())

View Code

總結

推薦使用lxml解析庫，必要時使用html.parser
標簽選擇篩選功能弱但是速度快
建議使用find()、find_all() 查詢匹配單個結果或者多個結果
如果對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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解析庫的安裝

初始化 BeautifulSoup(str,"解析庫")

標簽選擇器

選擇元素 soup.E

獲取名稱 soup.E.name

獲取屬性 soup.E.attrs[ ] or soup.E[ ]

獲取內容 soup.E.string

嵌套選擇 soup.E.E

子節點 soup.E.contents

子節點 soup.E.children

子孫節點 soup.E.descendants 包括標簽裏面的文本都屬於

父節點 soup.E.parent

祖先節點 soup.E.parents

兄弟節點 soup.E.next_siblings soup.E.previous_siblings

標準選擇器

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

標簽名獲取 soup.find_all(‘name‘)

屬性獲取 soup.find_all(attrs={})

文本內容獲取

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

find_parents() find_parent()

find_next_siblings() find_next_sibling()

find_previous_siblings() find_previous_sibling()

find_all_next() find_next()

find_all_previous() 和 find_previous()

CSS選擇器

通過select()直接傳入CSS選擇器即可完成選擇 soup.select(css選擇器)

獲取屬性 E.attrs[] or E[]

獲取內容 get_text()

總結

本文代碼皆來自崔慶才《Python3網絡爬蟲開發實戰》

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