Terry J. Reedy <tjre...@udel.edu> added the comment:

Let me clarify part of what I wrote.  If we make this change in 2.7.16, then 
any code that uses the return value will not run on anything previous.  This 
may not matter for you, but would be bad for public code.  This cost is present 
in all bug fixes, but usually there is the benefit that existing code will run 
better without being changed, or that it becomes possible to get certain 
results that were not possible before.  This code does not have those benefits.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33274>
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