The documentation for urllib.parse.urlparse states that:

The return value is a named tuple, which means that its items can be accessed by index or as named attributes, which are:

Attribute	Index	Value	Value if not present
...
params	3	No longer used	always an empty string

However it seems that the documentation does not reflect reality:

>>> 
>>> import urllib.parse
>>> p = urllib.parse.urlparse('http://foo.test/test;param')
>>> p
ParseResult(scheme='http', netloc='foo.test', path='/test', params='param', query='', fragment='')
>>> p[3]
'param'

and the returned named tuple has a populated params field.