Brett Cannon added the comment:

How warnings are handled vary from case to case. Typically its 
documentation-only if we want to warn people that they shouldn't use something 
because there is a better alternative but the code is not fundamentally broken 
and its in Python 2. If there is something wrong with it or it's just in Python 
3 then a deprecation warning with a decided amount of time for when the code 
will be removed.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue20438>
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