[Python-Dev] AutoNumber Enum (original) (raw)

Brett Cannon brett at python.org
Wed Jun 29 14:15:11 EDT 2016

On Wed, 29 Jun 2016 at 10:41 Ethan Furman <ethan at stoneleaf.us> 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 def isprimary(self): # typos in methods, etc, will raise return self in (self.Red, self.Grene, self.Blue) # typos after the initial definition stanza will raise BlueGreen = Blue + Grene There is, of course, the risk of typos during the initial member definition stanza, but since this magic only happens when the user explicitly asks for it (AutoNumberEnum), I think it is acceptable. The start parameter is still available, and assigning a number is supported (subsequent numbers will (re)start from the assigned number). Thoughts? Opinions? Flames?

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). -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.python.org/pipermail/python-dev/attachments/20160629/70490d9e/attachment.html>

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