[Distutils] PEP 517 again

[Greg Ewing]

Nathaniel Smith wrote:
> I now think it should only be a defined return value
> for get_requires_for_build_sdist and build_sdist, and should have
> special "sorry I can't do that Dave" semantics that are different from
> e.g. a missing get_requires_for_build_sdist hook.

I don't think there's anything wrong with NotImplemented triggering
different actions in different circumstances. It already has very
context-dependent "fall back to something else" semantics for
binary operators.

-- 
Greg