BeautifulSoup - How to find a specific class name alone

Question

How to find the li tags with a specific class name but not others? For example:

...
 no wanted 
 not his          


        

Answer 1

Possibly with a filter function as in the doc

def is_only_z(css_class):
    return css_class is not None and css_class == 'z'

bs4.find_all('li',class_=is_only_z)