Paul Moore <p.f.mo...@gmail.com> added the comment:

One of the tests in test_socket is checking that an attempt to connect to a 
port with no server running gives socket.error. For that, we need a port that's 
guaranteed to have no server present.

I think that one of the tests in test_httplib checks the source_address 
attribute to make sure the port it contains is the one you connected on - 
again, you need a specific port and it can't be in use. (Sorry, I'm not precise 
on the details of this one as it's only in trunk and I'm not at a PC with a 
trunk checkout at the moment).

Arguably these tests are of limited value and could simply be deleted, but they 
are there, and I don't see a way of implementing them without using something 
that gives you an unused port number...

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<http://bugs.python.org/issue8576>
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