from dataclasses import dataclass, InitVar


@dataclass
class MyList[T]:
    _internal_list: InitVar[list[T]]
    _length: InitVar[int]

    def __init__(self) -> None:
        self.__internal_list: list[T] = []
        self.__length = 0

    def add(self, item: T) -> None:
        self.__internal_list += [item]
        self.__length += 1

    @property
    def length(self) -> int:
        return self.__length


@dataclass
class GameObject:
    _position: InitVar[tuple[int, int]]

    def __post_init__(self, position: tuple[int, int]) -> None:
        assert (0, 0) <= position
        self.__position = position

    @property
    def position(self) -> tuple[int, int]:
        return self.__position

    @position.setter
    def position(self, position: tuple[int, int]) -> None:
        if (0, 0) > position:
            return
        self.__position = position


if __name__ == "__main__":
    xs: MyList[int] = MyList()
    xs.add(100)
    assert xs.length == 1
    position: tuple[int, int] = (0, 0)
    my_obj = GameObject(position)
    assert my_obj.position == (0, 0)
    try:
        GameObject((0, -1))
    except AssertionError:
        pass
    else:
        raise AssertionError(
            f"{my_obj} should have thrown a assertation error")
    my_obj.position = (-1, 0)
    assert my_obj.position == (0, 0)