[Python-Dev] PEP 435: initial values must be specified? Yes

Tue May 7 07:18:41 CEST 2013

On 7 May 2013 15:14, Tim Delaney <timothy.c.delaney at gmail.com> wrote:
> Unfortunately, if you subclass AutoNumber from IntEnum it breaks.
>> ---------- Run Python3 ----------
> Traceback (most recent call last):
> File "D:\home\repos\mercurial\ref435\ref435.py", line 346, in <module>
> class Color(AutoNumber):
> File "D:\home\repos\mercurial\ref435\ref435.py", line 184, in __new__
> enum_item = __new__(enum_class, *args)
> TypeError: int() argument must be a string or a number, not 'ellipsis'
>
Or using your exact implementation, but subclassing AutoNumber from IntEnum:
 class AutoNumber(IntEnum):
 def __new__(cls):
 value = len(cls.__enum_info__) + 1
 obj = object.__new__(cls)
 obj._value = value
 return obj
 def __int__(self):
 return self._value
 class Color(AutoNumber):
 red = ()
 green = ()
 blue = ()
 print(repr(Color.red))
---------- Run Python3 ----------
<Color.red: ()>
Tim Delaney
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