python - 获取BeautifulSoup中id为空的标签内容

Question

from bs4 import BeautifulSoup

page = """<span id="something">useless</span>
          <span id="">some text</span>
          <span id="different">useless</span>"""
soup = BeautifulSoup(page)

如何才能仅获取一些文本？使用 soup.find_all('span', {'id': ""}) 查找所有内容。

Answer 1

您有两个选择:

1. 使用自定义过滤器；传入一个函数，它会被要求为元素返回 True 或 False:

   soup.find_all(lambda e: e.name == 'span' and e.attrs.get('id') == '')
   

2. 使用CSS selector ，具有精确的属性匹配:

   soup.select('span[id=""]')
   

演示:

>>> from bs4 import BeautifulSoup
>>> page = """<span id="something">useless</span>
...           <span id="">some text</span>
...           <span id="different">useless</span>"""
>>> soup = BeautifulSoup(page)
>>> soup.find_all(lambda e: e.name == 'span' and e.attrs.get('id') == '')
[<span id="">some text</span>]
>>> soup.select('span[id=""]')
[<span id="">some text</span>]