[Python-ideas] Should nested classes in an Enum be Enum members?

[Guido van Rossum]

Sounds to me really strange that the nested class would become a member.
Probably because everything becomes a member unless it's a function (maybe
decorated)?

On Wed, Jun 27, 2018 at 7:47 AM Ethan Furman <ethan at stoneleaf.us> wrote:

> Consider the following Enum definition:
>
>    class Color(Enum):
>        RED = 1
>        GREEN = 2
>        BLUE = 3
>        @property
>        def lower(self):
>            return self.name.lower()
>        def spam(self):
>            return "I like %s eggs and spam!" % self.lower
>        class SomeClass:
>            pass
>
> Which of the above Color attributes are enums, and which aren't?
>
>
> .
>
>
> .
>
>
> .
>
> Answer:
>
>    - RED, GREEN, and BLUE are members
>
>    - lower and spam() are not
>
>    - SomeClass /is/ a member (but not its instances)
>
>
> Question:
>
>    Should `SomeClass` be an enum member?  When would it be useful to have
> an embedded class in an Enum be an enum member?
>
>
> The only example I have seen so far of nested classes in an Enum is when
> folks want to make an Enum of Enums, and the
> nested Enum should not itself be an enum member.  Since the
> counter-example already works I haven't seen any requests
> for it.  ;)
>
> So I'm asking the community:  What real-world examples can you offer for
> either behavior?  Cases where nested classes
> should be enum members, and cases where nested classes should not be
> members.
>
> Thanks!
>
> --
> ~Ethan~
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-- 
--Guido van Rossum (python.org/~guido)
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