post_mixin_enum

The post_mixin_enum() class decorator is used to add a new base class to an existing Enum:

from enum import Enum
from extendableenum import post_mixin_enum

class Animal(Enum):
    ANT = 1
    BEE = 2
    CAT = 3
    DOG = 4

@post_mixin_enum(Animal)
class SpeakMixin:
    def speak(self):
        if self is Animal.ANT:
            return ''
        elif self is Animal.BEE:
            return 'buzz buzz'
        elif self is Animal.CAT:
            return 'Meow'
        elif self is Animal.DOG:
            return 'Woof'
        else:
            return '???'

Animal.__bases__
isinstance(Animal.ANT, SpeakMixin)
Animal.BEE.speak()

>>> (<class '__main__.SpeakMixin'>, <enum 'Enum'>)
>>> True
>>> buzz buzz

Note

The mixin class can subclass Enum, however, it cannot not define any members, as extending an enum with the post_mixin_enum is not supported. Doing so will raise a TypeError. This can be bypassed if the mixin Enum is inheritable.