Inheritance-like auto delegation via composition in Python

composed_inheritance.py

from typing import Dict, Any


class Engine:
    def __init__(self, name: str, sound: str) -> None:
        self.name = name
        self.sound = sound

    def noise(self) -> str:
        return f"Engine {self.name} goes {self.sound}!"


class Bugatti:
    def __init__(self, engine: Engine, tier: str, price: int) -> None:
        self.engine = engine
        self.tier = tier
        self.price = price

    def info(self) -> Dict[str, Any]:
        return {"tier": self.tier, "price": self.price}

    def __getattr__(self, attr: str) -> Any:
        return getattr(self.engine, attr)


if __name__ == "__main__":
    engine = Engine("w16", "vroom")
    chiron = Bugatti(engine, "supercar", 3_000_000)
    assert chiron.info() == {"tier": "supercar", "price": 3000000}
    assert chiron.noise() == "Engine w16 goes vroom!"