为什么我不能继承Enum的子类？

Question

Consider the following code:

from  enum import Enum

class SubclassOfEnum(Enum):
    x = 5
print(SubclassOfEnum.x)

class SubSubclassOfEnum(SubclassOfEnum):
    y = 6
print(SubSubclassOfEnum.y)

We get an error, TypeError: Cannot extend enumerations ,

from: Python36\\lib\\enum.py", line 436, in _get_mixins_

Answer 1

Because subclassing Enum s with members is specifically disallowed .

For general use-cases for Enum check out When and where to use... .

For extending Enum s (adding members to existing Enum s, not subclassing them)...