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

Tim Delaney timothy.c.delaney at gmail.com
Tue May 7 07🔞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 class Color(AutoNumber): File "D:\home\repos\mercurial\ref435\ref435.py", line 184, in new enumitem = new(enumclass, *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: ()>

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