[Python-Dev] enum discussion: can someone please summarize open issues? (original) (raw)

Steven D'Aprano steve at pearwood.info
Mon Apr 29 10:30:13 CEST 2013

On Sun, Apr 28, 2013 at 11:50:16PM -0700, Ethan Furman wrote:

In other words, currently:

class Color(Enum): red = 1 green = 2 blue = 3 class MoreColor(Color): cyan = 4 magenta = 5 yellow = 6 black = 7 MoreColor.red is Color.red # True

Correct.

But as soon as:

type(Color.red) is Color # True type(MoreColor.red) is MoreColor # True

I don't believe this is correct. As I understand it, the proposal is the weaker guarantee:

isinstance(Color.red, Color) # True, possibly using instancecheck

Since red is not defined by MoreColor, there's no reason to expect that it will be a MoreColor instance. As far as I understand it, there is no guarantee that

isinstance(MoreColor.red, MoreColor)

will be true, even if that is possible using instancecheck.

-- Steven

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