Why can't I subclass a subclass of Enum?

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 Enums with members is specifically disallowed.

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

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