[issue23591] Add Flags and IntFlags

[Vedran Čačić]

Vedran Čačić added the comment:

So, in fact, your Flags are simply an overlayed namespace over int (the way to give some ints sticky names), and any int is accessible from any Flags, no matter whether it has a name or not? I must say that to me it seems radically different than (Int)Enum philosophy.

    class MyIntEnum(IntEnum):
        A = 1

    >>> MyIntEnum(0)
    ValueError: 0 is not a valid MyIntEnum

So, flags are not enums, nor they share the same principles (identity, exclusiveness). Why are they in the enum module at all?

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<http://bugs.python.org/issue23591>
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