On Fri, Mar 12, 2021 at 4:52 PM Ethan Furman <[email protected]> wrote:
> A question that comes up quite a bit on Stackoverflow is how to test to
> see if a value will result in an Enum member, preferably without having to
> go through the whole try/except machinery.
>
> A couple versions ago one could use a containment check:
>
> if 1 in Color:
>
> but than was removed as Enums are considered containers of members, not
> containers of the member values. It was also possible to define one's own
> `_missing_` method and have it return None or the value passed in, but that
> has also been locked down to either return a member or raise an exception.
>
> At this point I see three options:
>
> 1) add a `get(value, default=None)` to EnumMeta (similar to `dict.get()`
>
> 2) add a recipe to the docs
>
> 3) do nothing
>
> Thoughts?
>
> --
> ~Ethan~
Could this be an instance where match-case might become the canonical
solution?
I'm probably getting the syntax wrong, but maybe it would be something like:
match value:
case MyEnum():
assert isinstance(value, MyEnum)
case _:
assert not isinstance(value, MyEnum)
---
Ricky.
"I've never met a Kentucky man who wasn't either thinking about going home
or actually going home." - Happy Chandler
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