urllib.parse.unquote gives an misleading error message when:

>>> import urllib
>>> urllib.parse.unquote(b'bytesurl')
*** TypeError: a bytes-like object is required, not 'str'

while:

>>> urllib.parse.unquote('texturl')
texturl

The correct behavior is to pass a string/text object to unquote. But passing a bytes object gives a misleading error message.

A fix would be to add an assertion in
https://github.com/python/cpython/blob/0250de48199552cdaed5a4fe44b3f9cdb5325363/Lib/urllib/parse.py#L614 like:

>>> assert isinstance(string, str)

We don't generally do type checks like that.  This is a specific case of a general issue with binary operators and mismatched string/bytes types.  I thought there was an open issue for it, but I haven't found it yet.

@r.david.murray I googled the error message and I hope you are referring to the below issue which has a patch and test.

issue : https://bugs.python.org/issue32498

I thought there was a more general issue for the 'in' operator itself, but perhaps the issue you found was indeed the one I was thinking of.  This one certainly seems to be a duplicate of that one ;)  If you've a mind to, you could turn the patch in that issue into a PR to move the issue forward.