{代码...} 比如第一个a元素:a#a1,要获取这个元素以上的所有网页源码: {代码...}

html - python中怎么获取某个网页元素之前的所有源码?

<html>
    <head>
        <title>The Dormouse's story </title>
    </head> 
    <body> 
        <p id="p1">p1p1p1
            <b id='b1'>b1b1b1</b>
        </p> 
        <p id="p2">p2p2p2
            <ul id='u1'>u1u1u1</ul>
            <a id="a1">a1a1a1</a>
            <p id='d1'>
                <a id="a2">a2a2a2 </a>
                <b id='b2'>b2b2b2</b>
                <p id='p3'>p3p3p3</p>
            </p>
            <a id="a3">a3a3a3 </a>
        </p> 
        <p id="p4">p4p4p4</p>
    </body>
</html>

比如第一个a元素:a#a1,要获取这个元素以上的所有网页源码:

<html>
    <head>
        <title>The Dormouse's story </title>
    </head> 
    <body> 
        <p id="p1">p1p1p1
            <b id='b1'>b1b1b1</b>
        </p> 
        <p id="p2">p2p2p2
            <ul id='u1'>u1u1u1</ul>
            <a id="a1">a1a1a1</a>
        </p>
    </body>
</html>

天蓬老师2742 天前927

全部回复(5)我来回复

阿神2017-04-18 09:49:08

由于你原来的html不合规范，我改了点。
下面是用 lxml 做的。

doc = '''
<html>
    <head>
        <title>The Dormouse's story </title>
    </head> 
    <body> 
        <p id="p1">p1p1p1
            <b id='b1'>b1b1b1</b>
        </p> 
        <p id="p2">p2p2p2</p>
        <p id='d1'>
            <ul id='u1'>u1u1u1</ul>
            <a id="a1">a1a1a1</a>
            <p id='d2'>
                <a id="a2">a2a2a2 </a>
                <b id='b2'>b2b2b2</b>
                <p id='p3'>p3p3p3</p>
            </p>
            <a id="a3">a3a3a3 </a>
        </p> 
        <p id="p4">p4p4p4</p>
    </body>
</html>
'''

from lxml import html

tree = html.fromstring(doc)
a = tree.get_element_by_id("a1")
print(html.tostring(a))
print(html.tostring(tree).decode())

def dropnode(e=None):
    if e is None: return
    if e.tag == 'body': return
    nd = e.getnext()
    while nd is not None:
        nd.drop_tree()
        nd = e.getnext()
    dropnode(e.getparent())

dropnode(a)
print(html.tostring(tree).decode())

PHPz2017-04-18 09:49:08

使用bs4去提取

PHP中文网2017-04-18 09:49:08

雷雷

阿神2017-04-18 09:49:08

新手,我只学了re模块，所以只用re模块+普通方式来提取

>>> html = '''
<html>
    <head>
        <title>The Dormouse's story </title>
    </head> 
    <body> 
        <p id="p1">p1p1p1
            <b id='b1'>b1b1b1</b>
        </p> 
        <p id="p2">p2p2p2
            <ul id='u1'>u1u1u1</ul>
            <a id="a1">a1a1a1</a>
            <p id='d1'>
                <a id="a2">a2a2a2 </a>
                <b id='b2'>b2b2b2</b>
                <p id='p3'>p3p3p3</p>
            </p>
            <a id="a3">a3a3a3 </a>
        </p> 
        <p id="p4">p4p4p4</p>
    </body>
</html>
'''
>>> html_1 = re.search(r'<a',html)
>>> html_1 = html_1.span()
>>> print(html[:html_1[0]])

<html>
    <head>
        <title>The Dormouse's story </title>
    </head> 
    <body> 
        <p id="p1">p1p1p1
            <b id='b1'>b1b1b1</b>
        </p> 
        <p id="p2">p2p2p2
            <ul id='u1'>u1u1u1</ul>
            
>>>

伊谢尔伦2017-04-18 09:49:08

be模块最顺手

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