Python <3.11 does not have the enum.EnumType metaclass

[stefanches7]

Evidence: https://docs.python.org/3.10/library/enum.html#data-types vs. https://docs.python.org/3.11/library/enum.html#data-types

Ran on Python 3.10:

Running in the same environment with Python 3.12 solves this.

[stefanches7]

One could add it to the environment.yml and for the pip users either in a README or something in the flavor of https://stackoverflow.com/a/68987487

[stefanches7]

@joshmoore

[joshmoore]

Doh! Thanks, @stefanches7. I'd be for supporting 3.10+ but we'll need to do something a bit smarter here. Do you know off-hand?

[stefanches7]

I was thinking in the direction of inherting from Enum: https://docs.python.org/3/library/functions.html#issubclass
Would it theoretically work? I might then open a PR @joshmoore

[joshmoore]

Off-hand it sounds fine.

[stefanches7]

Tested locally. My educated guess is that the metaclasses have a different class structure interface.
I did not check how does it work for python < 3.10, because obviously this won't be compatible with the most recent Python versions (>3.11) @joshmoore

[joshmoore]

One possibility maybe is to just use isinstance:

>>> import enum
>>> class Color(enum.Enum):
...     A=1
...
>>> Color.A
<Color.A: 1>
>>> isinstance(Color.A, enum.Enum)
True