How to create Haskell-like sum types in Python?

Question

If I have some simple sum type in Haskell, like

data Owner = Me | You

How do I express that in Python in a convenient way?

Answer 1

An Enum or a Union is the closest thing to a tagged union or sum type in Python.

Enum

from enum import Enum

class Owner(Enum):
    Me = 1
    You = 2

Union

https://docs.python.org/3/library/typing.html#typing.Union

import typing

class Me:
    pass
class You:
    pass

owner: typing.Union[Me, You] = Me