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I understand your point of view, but I disagree.
Various libraries and projects rely on urlparse.urlparse and urllib.parse.urlparse.
This bug just blew up in my face. I'm working with Cython and PyQt4.
When a developer relies on ParseResult().netloc being a valid netloc, and .port being None [bool(False)] or a integer between 1-65535 really bad things can happen in a environment that has 0-tolerance for security issues (like C/C++ mixed in python).
I agree that the 
if self.scheme == "http":
 return 80
elif self.scheme == "https":
 [...]
part of my patch is debetable, but we should _at least_ ensure that IF there is a ParseResult().port, the developer can be sure that it is a valid port between 1-65545.
i apologize for upload the whole file; i attached the diff now.
regards,
dan