[issue38250] enum.Flag should be more set-like

[Vedran Čačić]

Vedran Čačić <vedgar at gmail.com> added the comment:

1. +0 _if_ the implementation is easy to explain. If backward compatibility is an issue, we can always add a property: 
for flag in flags.set:
(though set might imply unorderedness:)
2. -1. Guido said long ago that all lens should be O(1).
(Of course, if you do make it O(1), I have no objection.)
3. +1, absolutely.

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nosy: +veky

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<https://bugs.python.org/issue38250>
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