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 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.
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 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.

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

爬虫--BeautifulSoup使用的更多相关文章

  1. 爬虫beautifulsoup实践

    爬虫beautifulsoup实践: 目的:在https://unsplash.com/上爬取图片并保存到本地文件夹里.   一.观察response.首先,在Chrome浏览器里观察一下该网页的re ...

  2. 爬虫——BeautifulSoup和Xpath

    爬虫我们大概可以分为三部分:爬取——>解析——>存储 一 Beautiful Soup: Beautiful Soup提供一些简单的.python式的函数用来处理导航.搜索.修改分析树等功 ...

  3. Python爬虫-- BeautifulSoup库

    BeautifulSoup库 beautifulsoup就是一个非常强大的工具,爬虫利器.一个灵活又方便的网页解析库,处理高效,支持多种解析器.利用它就不用编写正则表达式也能方便的实现网页信息的抓取 ...

  4. Python爬虫 | Beautifulsoup解析html页面

    引入 大多数情况下的需求,我们都会指定去使用聚焦爬虫,也就是爬取页面中指定部分的数据值,而不是整个页面的数据.因此,在聚焦爬虫中使用数据解析.所以,我们的数据爬取的流程为: 指定url 基于reque ...

  5. 网络爬虫BeautifulSoup库的使用

    使用BeautifulSoup库提取HTML页面信息 #!/usr/bin/python3 import requests from bs4 import BeautifulSoup url='htt ...

  6. 爬虫----beautifulsoup的简单使用

    beautifulSoup使用: 简单来说,Beautiful Soup是python的一个库,最主要的功能是从网页抓取数据. pip3 install beautifulsoup4 解析器 Beau ...

  7. 爬虫----BeautifulSoup模块

    一.介绍 Beautiful Soup 是一个可以从HTML或XML文件中提取数据的Python库.它能够通过你喜欢的转换器实现惯用的文档导航,查找,修改文档的方式.Beautiful Soup会帮你 ...

  8. python爬虫---BeautifulSoup的用法

    BeautifulSoup是一个灵活的网页解析库,不需要编写正则表达式即可提取有效信息. 推荐使用lxml作为解析器,因为效率更高. 在Python2.7.3之前的版本和Python3中3.2.2之前 ...

  9. Python 爬虫-BeautifulSoup

    2017-07-26 10:10:11 Beautiful Soup可以解析html 和 xml 格式的文件. Beautiful Soup库是解析.遍历.维护“标签树”的功能库.使用Beautifu ...

  10. 爬虫--BeautifulSoup

    什么是BeautifulSoup? BeautifulSoup支持的一些解析库 基本使用 from bs4 import BeautifulSoup html =""" ...

随机推荐

  1. Shiro授权认证原理和流程

    先来张图: 这是一张shiro的功能图: Authentication: 身份认证/登录,验证用户是否拥有相应的身份 Authorization: 授权/权限验证,验证某个已认证的用户是否拥有某个权限 ...

  2. JavaScript学习——使用JS实现首页轮播图效果

    1.相关技术 获取元素 document.getElementById(“id 名称”) 事件(onload) 只能写一次并且放到body标签中 定时操作:setInterval(“changeImg ...

  3. java中三个类别加载器的关系以及各自加载的类的范围

    Java在需要使用类别的时候,才会将类别加载,Java的类别载入是由类别载入器(Class loader)来达到的,预设上,在程序启动之后,主要会有三个类别加载器:Bootstrap Loader.E ...

  4. CDR都特价了，你还用破解版？

    目前,CDR X6特价活动,从18的年的元旦一直持续到现在,真可谓是痛快淋漓,大喜若狂,但是,似乎好像是....这么强有力的活动马上就要告一段落了,因为限量1000 套的抢购要卖!完!了!难不难过,痛 ...

  5. ZBrush雕刻生物小技巧

    本教程主要学习如何使用ZBrush®3D图形绘制软件的工具和笔刷雕刻酷酷的生物造型,我们今天来看看在游戏.媒体和电视领域有着十几年丰富经验的3D角色艺术家Francis-Xavier Martins是 ...

  6. js+css实现全局loading加载

    js var Mask = function() { //定义一个Mask对象 this.btn = ["取消", "确定"], this.init = fun ...

  7. 字符串的格式化(转自武sir)

    百分号s方式: (name)      可选,用于选择指定的key flags          可选,可供选择的值有: +       右对齐:正数前加正好,负数前加负号: -        左对齐 ...

  8. python登录注册改良版

    #在执行本脚本的时候,需要先注册,否则会报字符串不匹配sum=3while True: #如果条件为真,则一直循环 print("先注册,在登录") print("1.注 ...

  9. iview中单击行，使得checkbox状态的方法

    直接贴代码,这是一组jquery全选,全不选,反选代码 <!DOCTYPE html> <html lang="en"> <head> < ...

  10. python 面向对象 类方法，静态方法，property

    property 内置装饰器函数 只在面向对象使用 把方法当初属性使用(方法不加参数) 例子: class Rectangle: def __init__(self,long,wide,color): ...