On Sun, Dec 31, 2017, at 00:33, Guido van Rossum wrote:
> I'm not keen on this recommendation. An argument that takes a Set[Foo]
> would mean that in order to specify:
> - no flags: you'd have to pass set() -- you can't use {} since that's an
> empty dict, not an empty set
Optional[Set[Foo]]?
> - one flag: you'd have to pass {Foo.BAR} rather than just Foo.BAR
> - two flags: you'd have to pass {Foo.BAR, Foo.BAZ} rather than Foo.BAR |
> Foo.BAZ
Maybe the flags themselves should be of a type that you can do both with (i.e.
each value is a set containing itself).
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