dataclass-enum (RUF049)

This rule is unstable and in preview. The --preview flag is required for use.

What it does

Checks for enum classes which are also decorated with @dataclass.

Decorating an enum with @dataclass() does not cause any errors at runtime, but may cause erroneous results:

@dataclass
class E(Enum):
    A = 1
    B = 2

print(E.A == E.B)  # True

from dataclasses import dataclass
from enum import Enum


@dataclass
class E(Enum): ...

Use instead:

from enum import Enum


class E(Enum): ...