On Wed, Sep 6, 2017 at 10:26 AM, Guido van Rossum <guido@python.org> wrote:
So we've seen a real use case for __class__ assignment: deprecating things on access. That use case could also be solved if modules natively supported defining __getattr__ (with the same "only used if attribute not found otherwise" semantics as it has on classes), but it couldn't be solved using @property (or at least it would be quite hacky).
Is there a real use case for @property? Otherwise, if we're going to mess with module's getattro, it makes more sense to add __getattr__, which would have made Nathaniel's use case somewhat simpler. (Except for the __dir__ thing -- what else might we need?) -- --Guido van Rossum (python.org/~guido)
I think a more natural way for the __dir__ problem would be to update module_dir() in moduleobject.c to check if __all__ is defined and then just return that list if it is defined. I think that would be a friendlier default for __dir__ anyway. Cody