The Dormouse's story p1p1p1 b1b1b1
p2p2p2
a2a2a2 b2b2b2
p3p3p3
a3a3a3p4p4p4
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:
The Dormouse's story p1p1p1 b1b1b1
p2p2p2
be模块最顺手
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> >>>
from bs4 import BeautifulSoup as bs def dropAllNextEle(eleOfBS, returnTrueOrFalseToKeepOrDropEleFunc = None): # 删除ele元素之后的所有节点元素(其实就是递归删除eleOfBS及由近及远历代父元素的兄弟元素);第二个参数是个函数,以第一个参数的各级兄弟元素为参数,返回true,保留ele,否则删除ele. if eleOfBS is None: return if eleOfBS.name == 'body': return next_siblings = eleOfBS.next_siblings if next_siblings: next_siblings_list = [] for item in next_siblings: if item: next_siblings_list.insert(0, item) for item in next_siblings_list: if returnTrueOrFalseToKeepOrDropEleFunc: if not returnTrueOrFalseToKeepOrDropEleFunc(item): item.replace_with('') else: item.replace_with('') dropAllNextEle(eleOfBS.parent, returnTrueOrFalseToKeepOrDropEleFunc) else: dropAllNextEle(eleOfBS.parent, returnTrueOrFalseToKeepOrDropEleFunc) soup = bs(html_source, 'html5lib') a1_ele = soup.find('a', id = 'a1') dropAllNextEle(a1_ele, lambda item: type(item) == type(soup.new_string('strstr'))) print soup
使用bs4去提取
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())