invalid-enum-extension / E0244

Message emitted:

Extending inherited Enum class "%s"

Description:

Used when a class tries to extend an inherited Enum class. Doing so will raise a TypeError at runtime.

Problematic code:

from enum import Enum


class Color(Enum):
    ORANGE = 1
    CHERRY = 2


class Fruit(Color):  # [invalid-enum-extension]
    APPLE = 3

Correct code:

from enum import Enum


class Color(Enum):
    ORANGE = 1
    CHERRY = 2


class Fruit(Enum):
    ORANGE = 1
    CHERRY = 2
    APPLE = 3

Created by the classes checker.