在BeautifulSoup CSS选择器中处理冒号

我正在尝试div使用CSS选择器找到父级:

div[]

这会引发错误:

>>> soup.select('div[]')
Traceback (most recent call last):
  File "", line 1, in 
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/bs4/element.py", line 1400, in select
    'Only the following pseudo-classes are implemented: nth-of-type.')
NotImplementedError: Only the following pseudo-classes are implemented: nth-of-type.

看起来像BeautifulSoup尝试将冒号解释为伪类语法.

我试图遵循在CSS选择器中的元素ID中处理冒号时建议的建议,但它仍然会抛出错误:

>>> soup.select('div[]')
Traceback (most recent call last):
  File "", line 1, in 
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/bs4/element.py", line 1400, in select
    'Only the following pseudo-classes are implemented: nth-of-type.')
NotImplementedError: Only the following pseudo-classes are implemented: nth-of-type.
>>> soup.select('div[]')
Traceback (most recent call last):
  File "", line 1, in 
  File "/Users/user/.virtualenvs/so/lib/python2.7/site-packages/bs4/element.py", line 1426, in select
    'Unsupported or invalid CSS selector: "%s"' % token)
ValueError: Unsupported or invalid CSS selector: "div[

问题:

在BeautifulSoupCSS选择器中使用/转义冒号的正确方法是什么？

请注意,我可以使用部分属性匹配来解决它:

soup.select("div[style$=flex]")

或者,用find_all():

soup.find_all("div", )

还要注意,我理解使用style定位元素远不是一个好的定位技术,但问题本身是通用的,提供的HTML只是一个例子.