以防万一有人遇到这个问题。BeautifulSoup现在支持此功能:
Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit (Intel)]
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In [1]: import bs4
In [2]: soup = bs4.BeautifulSoup('<div class="foo bar"></div>')
In [3]: soup(attrs={'class': 'bar'})
Out[3]: [<div class="foo bar"></div>]
另外,您不必再键入findAll。