[issue24018] add a Generator ABC

[Martin Panter]

Martin Panter added the comment:

I agree that there is no big reason why we should force generators to stop working after close(). Your new default implementation of close() is probably the right thing too. I added a few new comments on Reitveld.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24018>
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