python从href源提取id值

Question

我已经设法提取href URI的使用美丽的汤从页面的来源，但是我现在想从下面的例子的多个实例中提取UID值：

e. g.

<a href="test.html?uid=5444974">
<a href="test.html?uid=5444972">
<a href="test.html?uid=54444972">

帮助将不胜感激！

Answer 1

使用urlparse和parse\u qs：

html = """<a href="test.html?uid=5444974">
<a href="test.html?uid=5444972">
<a href="test.html?uid=54444972">
"""

from bs4 import BeautifulSoup as BS
from urlparse import urlparse, parse_qs
soup = BS(html)
for a in soup('a', href=True):
    print parse_qs(urlparse(a['href']).query)['uid'][0]

输出：

5444974
5444972
54444972

Answer 2

>>> html
'<a href="test.html?uid=5444974">\n<a href="test.html?uid=5444972">\n<a href="test.html?uid=54444972">'
>>> soup = BeautifulSoup(html)
>>> ass = soup.find_all('a')
>>> r = re.compile('uid=(\d+)')
>>> uids = []
>>> for a in ass:
...     uids.append(r.search(a['href']).group(1))
... 
>>> uids
['5444974', '5444972', '54444972']
>>>