Guido van Rossum <gu...@python.org> added the comment: It looks like PyMapping_Check() already checks for the presence of a fairly arbitrary special operation (mp_subscript). It sounds fine to replace that with a check for the presence of a keys() or items() method (I'm not sure which one is more representative). I wish the check can be done fast -- but I fear that it'll involve a dict lookup. So be it.
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