Mark Dickinson added the comment:

This doesn't strike me as something it's essential to resolve before 3.3.1.

And I agree that decimal.localcontext(None) looks peculiar.  I noticed this 
yesterday when looking at #15136 and dismissed it as an artifact of the 
implementation---I didn't think to check what the docs said.  I think it's a 
bit unfortunate that the docs specify "ctx=None".  I doubt that too much 
thought went into that;  without knowing the history, I suspect that at the 
time it was just a way to indicate that the context was an optional argument.

IOW, my vote would be not to require that None is accepted, and to treat this 
as an minor error in the documentation.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15783>
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