Is enum iteration order guaranteed?

Steven D'Aprano steve+comp.lang.python at pearwood.info
Tue Jan 10 01:22:34 EST 2017


On Tuesday 10 January 2017 16:55, Ethan Furman wrote:

> On 01/09/2017 09:18 PM, Steven D'Aprano wrote:
> 
>> The docs say that enums can be iterated over, but it isn't clear to me
>> whether they are iterated over in definition order or value order.
>>
>> If I have:
>>
>> class MarxBros(Enum):
>>      GROUCHO = 999
>>      CHICO = 5
>>      HARPO = 11
>>      ZEPPO = auto()
>>      GUMMO = -1
>>
>> GROUCHO, CHICO, HARPO, ZEPPO, GUMMO = list(MarxBros)
> 
> In Python 3 it is always definition order.

I only care about Python 3 for this.

Did I miss something in the docs, or should this be added?


[...]
>> On that related note, how would people feel about a method that injects
>> enums into the given namespace?
[...]
> Or you can do globals().update(MarxBros.__members__).

Sweet!



-- 
Steven
"Ever since I learned about confirmation bias, I've been seeing 
it everywhere." - Jon Ronson



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