[Python-Dev] PEP 435 -- Adding an Enum type to the Python standard library

Guido van Rossum guido at python.org
Fri Apr 26 00:19:48 CEST 2013

On Thu, Apr 25, 2013 at 3:02 PM, Barry Warsaw <barry at python.org> wrote:
> On Apr 25, 2013, at 02:54 PM, Guido van Rossum wrote:
>>I don't know what's going on,
> Mostly that this is my first opportunity to chime in on the subject.
>>but it feels like we had this same discussion a week ago, and I still
>>disagree. Disregarding, the C[i] notation, I feel quite strongly that in the
>>following example:
>>class Color(Enum):
>>    red = 1
>>    white = 2
>>    blue = 3
>>    orange = 4
>>the values Color.red etc. should be instances of Color. This is how
>>things work in all other languages that I am aware of that let you
>>define enums.
> Is it enough that isinstance(Color.red, Color) returns True, or do you
> really-and-truly want them to be instances of Color?
> I still think it's weird, but I could accept the former if you're flexible on
> the latter, which in some sense is just an implementation detail anyway.

Clearly this is a trick question. :-)

I was told when this was brought up previously (a week ago?) that it
would be simple to make it truly the same class.

I suppose you were going to propose to use isinstance() overloading,
but I honestly think that Color.red.__class__ should be the same
object as Color.

--Guido van Rossum (python.org/~guido)

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