获取BeautifulGroup中id为空的标记的内容

Question

from bs4 import BeautifulSoup

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

我怎样才能只得到some text？使用soup.find_all('span', {'id': ""})可以找到所有内容。在

Answer 1

您有两种选择：

1. 使用自定义筛选器；传入一个函数，它将被要求为元素返回True或{}：

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

2. 使用一个CSS selector，属性完全匹配：

   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>]