Python 如何查找特定 <ul> 类中的所有 <li>？
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How to find all <li>'s within a specific <ul> class?
提问by user1063287
Environment:
环境：
Beautiful Soup 4
美汤 4
Python 2.7.5
蟒蛇 2.7.5
Logic:
逻辑：
'find_all' <li>instances that are within a <ul>with a class of my_classeg:
'find_all'<li>实例在<ul>一个类中，my_class例如：
<ul class='my_class'>
<li>thing one</li>
<li>thing two</li>
</ul>
Clarification: Just get the 'text' between the <li>tags.
说明：只需获取<li>标签之间的“文本”即可。
Python Code:
蟒蛇代码：
(The find_all below is not correct, I am just putting it in context)
（下面的 find_all 不正确，我只是把它放在上下文中）
from bs4 import BeautifulSoup, Comment
import re
# open original file
fo = open('file.php', 'r')
# convert to string
fo_string = fo.read()
# close original file
fo.close()
# create beautiful soup object from fo_string
bs_fo_string = BeautifulSoup(fo_string, "lxml")
# get rid of html comments
my_comments = bs_fo_string.findAll(text=lambda text:isinstance(text, Comment))
[my_comment.extract() for my_comment in my_comments]
my_li_list = bs_fo_string.find_all('ul', 'my_class')
print my_li_list
采纳答案by TerryA
This?
这个？
>>> html = """<ul class='my_class'>
... <li>thing one</li>
... <li>thing two</li>
... </ul>"""
>>> from bs4 import BeautifulSoup as BS
>>> soup = BS(html)
>>> for ultag in soup.find_all('ul', {'class': 'my_class'}):
... for litag in ultag.find_all('li'):
... print litag.text
...
thing one
thing two
Explanation:
解释：
soup.find_all('ul', {'class': 'my_class'})finds all the ultags with a class of my_class.
soup.find_all('ul', {'class': 'my_class'})查找ul类为 的所有标签my_class。
We then find all the litags in those ultags, and print the content of the tag.
然后我们找到这些li标签中的所有ul标签，并打印标签的内容。
回答by sberry
This does the trick with BeautifulSoup3, don't have 4 on this machine.
这对 BeautifulSoup3 有用，这台机器上没有 4。
>>> [li.string for li in bs_fo_string.find('ul', {'class': 'my_class'}).findAll('li')]
[u'thing one', u'thing two']
The idea is to search first for the ul with 'my_class' class, and then findAll of the li's within that ul.
这个想法是首先搜索带有“my_class”类的 ul，然后在该 ul 中查找所有 li。
If you had additional ul's with the same class you might want to use a findAll on the ul search as well, and change the list comprehension to be nested.
如果您有同一个类的其他 ul，您可能还想在 ul 搜索中使用 findAll，并将列表理解更改为嵌套。
