[Python-Dev] enum discussion: can someone please summarize open issues?
Guido van Rossum
guido at python.org
Sun Apr 28 22:02:11 CEST 2013
My opinions added
On Sun, Apr 28, 2013 at 12:32 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> Example enumeration:
> class Seasons(Enum):
> SPRING = 1
> SUMMER = 2
> AUTUMN = 3
> WINTER = 4
> days_in_year = 365
> def avg_temp(self):
> return (75, 92, 66, 33)[int(self)+1] # enums are 1-based
> Definite Issues:
> - should enum items be of the type of the Enum class? (i.e. type(SPRING)
> is Seasons)
> - should an enum item be selectable via __call__ instead of __getitem__
> (i.e. Seasons(3) is AUTUMN)
> - should days_in_year be enumerated?
Yes. (If you don't want it to be, and it's not a method/descriptor,
move it out of the class.)
> - should avg_temp be enumerated?
> - for the above two, how should they be included/excluded?
IMO Everything should be enumerated except
(a) things with a __get__() method (i.e. descriptors)
(b) __dunder__ names
Also, I believe there's still an issue on the order in which items are
returned by iter(Seasons), but I don't know which way this is heading.
--Guido van Rossum (python.org/~guido)
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