Hello good morning. I've decided to open a discussion of a topic that I consider should be part of dataclasses, but not sure how suggestions work and many threads recommend to check python dev first so-. Anyways, at the moment that I write this message in python3.10.1, It happens that when making a class with the dataclasses module, this class can't actually be used in Multiple inheritance for Enum purposes, this is mostly to avoid code repetition by having to write the methods over again. Here's an example from dataclasses import dataclass from enum import Enum @dataclass class Foo: a: int = 0 class Entries(Foo, Enum): ENTRY1 = Foo(1) ENTRY2 = Foo(2) ENTRY3 = Foo(3) assert Entries.ENTRY1.a == 1 This raises AssertionError, due to the values not being defined at that point, as the class is currently just using the default paremeters. This is why I think it'd be essential to implement __set__ in the module. Currently there's a workaround to have this work, which is defining a __set__ but doing this, in more complex cases, can get to be very tedious and repetitive coding wise from dataclasses import dataclass from enum import Enum @dataclass class Foo: a: int = 0 def __set__(self, instance, value: int): instance.a = value class Entries(Foo, Enum): ENTRY1 = Foo(1) ENTRY2 = Foo(2) ENTRY3 = Foo(3) assert Entries.ENTRY1.a == 1 Have a great day, and hopefully this post enables a good discussion.