[Python-Dev] AutoNumber Enum

Ethan Furman ethan at stoneleaf.us
Wed Jun 29 15:13:40 EDT 2016

On 06/29/2016 11:15 AM, Brett Cannon wrote:
> On Wed, 29 Jun 2016 at 10:41 Ethan Furman wrote:

>> There is a several-month-old request to add aenum's [1] AutoNumberEnum
>> to the stdlib [2].
>> The requester and two of the three developers of Enum are in favor (the
>> third hasn't chimed in yet).
>> This new addition would enable the following:
>>         from Enum import AutoNumberEnum
>>         class Color(AutoNumberEnum):
>>             # auto-number magic is on
>>             Red
>>             Green
>>             Blue
>>             Cyan
>>             # magic turns off when non-enum is defined
> Is it going to subclass Enum or IntEnum?


> Personally I would be quite
> happy to never have to specify a value for enums ever again, but only if
> they subclass Enum (since IntEnum is for compatibility with C stuff
> where a specific value is needed I don't think users need to mess that
> up by having the automatic numbering not work how they would expect).

If a user really wants that they can, of course, specify both 
AutoNuberEnum and IntEnum in the class header.


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