Try pattern matching + dataclass in python 3.10

matching_for_dataclasses.py

import dataclasses


@dataclasses.dataclass
class User:
    name: str
    age: int = 0

if __name__ == "__main__":
    u = User("taro", 32)


    match u:
        case User(name, age):
            print(f"{name}, {age}")

use_abstract_with matching.py

from abc import ABC
from dataclasses import dataclass

@dataclass
class AbstractDataclass(ABC):
    def __new__(cls, *args, **kwargs):
        if cls == AbstractDataclass or cls.__bases__[0] == AbstractDataclass:
            raise TypeError("Cannot instantiate abstract class.")
        return super().__new__(cls)


@dataclass
class User(AbstractDataclass):
    name: str
    age: int = 0

@dataclass
class PaidUser(User):
    plan: str = "starter"

@dataclass
class FreeUser(User):
   pass

if __name__ == "__main__":
    u = PaidUser("taro", 32)


    match u:
        case PaidUser(name, age, plan):
            print(f"PaidUser: {name}, {age}, {plan}")
        case FreeUser(name, age):
            print(f"FreeUser: {name}, {age}")