And how would you implement that without support from the compiler?
Does it use a hook that catches the NameError?
On Wed, Jun 29, 2016 at 11:15 AM, Brett Cannon
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
def is_primary(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).
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