Nick Coghlan <ncogh...@gmail.com> added the comment:

Thinking about the generator-iterator case a bit more, "False" would be a bad 
default for that. Allowing "NotImplemented" to indicate the ambiguous "Might be 
finite, might be infinite" state, and using that as the default for 
generator-iterators, would probably make sense.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue33939>
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