[Python-Dev] PEP 435: initial values must be specified? Yes (original) (raw)

Tim Delaney timothy.c.delaney at gmail.com
Tue May 7 04:58:42 CEST 2013

On 7 May 2013 12:29, Ethan Furman <ethan at stoneleaf.us> wrote:

On 05/05/2013 02:55 PM, Tim Delaney wrote:

So long as I can get one of the requirements documented to implement an auto-number syntax I'll be happy enough with stdlib enums I think. class Color(AutoIntEnum): red = ... green = ... blue = ... Will this do? class AutoNumber(Enum): def new(cls): value = len(cls.enuminfo) + 1 obj = object.new(cls) obj.value = value return obj def int(self): return self.value class Color(AutoNumber): red = () green = () blue = ()

Considering that doesn't actually work with the reference implementation (AutoNumber.new is never called) ... no.

print(Color.red._value) print(int(Color.red))

---------- Run Python3 ---------- () Traceback (most recent call last): File "D:\home\repos\mercurial\ref435\ref435.py", line 292, in print(int(Color.red)) TypeError: int returned non-int (type tuple)

Plus I would not want to use the empty tuple for the purpose - at least ... implies something ongoing.

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