Martin Panter added the comment:

Patch v2 just changes a test to use “with self.assertRaises()”.

The behaviour of urlparse() succeeding and then result.port failing is indeed 
odd and surprising. Hopefully documenting this behaviour will help with the 
“surprising” aspect. But changing it would surely break compatibility. For 
example, the following is still potentially useful:

>>> urlsplit("http://localhost:ipp/";).netloc
'localhost:ipp'

On Unix, some programs look up port names in /etc/services, even though this is 
not valid for URLs according to the RFCs, and urlsplit().port does not support 
it. In this case “ipp” would be whatever port the Internet Printing Protocol 
server is configured to run on.

----------
Added file: http://bugs.python.org/file38642/port-ValueError.v2.patch

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