class CarModel:
    mapping = {}
 
    @staticmethod
    def _key(key, mapping=mapping):
        def decorator(func):
            mapping[key] = func
        return decorator
 
    @classmethod
    def from_dict(cls, d: dict):
        instance = cls()
        for key, value in d.items():
            cls.mapping[key](instance, value)
        return instance
 
    def __init__(self):
        self.__wheel_count: int = 0
 
    @_key('wheelCount')
    def set_wheel_count(self, value: int) -> None:
        self.__wheel_count = value
 
class TruckModel(CarModel):
    def __init__(self):
        super().__init__()
        self.__load_in_kg: int = 0
 
    @CarModel._key('loadInKg')
    def set_load_in_kg(self, value: int) -> None:
        self.__load_in_kg= value
 
print(vars(CarModel.from_dict({'wheelCount': 4})))
print(vars(TruckModel.from_dict({'wheelCount': 6, 'loadInKg': 8000})))

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