在BeautifulSoup中获取带有空id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)

我如何才能获得some text？使用soup.find_all('span', {'id': ""})查找所有内容。

Answer 1

您有两种选择：

1. 使用自定义过滤器;传入一个函数，系统会要求它返回True或False元素：

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

2. 使用具有完全属性匹配的CSS selector：

   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>]