class PetrolCar:
    def __init__(self, tank_capacity):
        self.__fuel_level = 0
        self.tank_capacity = tank_capacity


    def fill_up(self):
        self.__fuel_level = self.tank_capacity


    @property
    def fuel_level(self):
        return self.__fuel_level




class ElectricCar:
    def __init__(self, battery_capacity):
        self.__battery_level = 0
        self.battery_capacity = battery_capacity

    def recharge(self):
        self.__battery_level = self.battery_capacity

    @property
    def battery_level(self):
        return self.__battery_level


class HybridCar(PetrolCar, ElectricCar):
    def __init__(self, tank_capacity,
                 battery_capacity,
                 running_mode):
        PetrolCar.__init__(self, tank_capacity)
        ElectricCar.__init__(self, battery_capacity)
        self.__running_mode = running_mode

    def switch_mode(self):
        if self.__running_mode == 'petrol':
            self.__running_mode = 'electric'
        elif self.__running_mode == 'electric':
            self.__running_mode = 'petrol'

        print("Switched mode to ", self.__running_mode)



    @property
    def running_mode(self):
        return self.__runing_mode



#object_petrol_car = PetrolCar(30)
#print(object_petrol_car.fuel_level)
#object_petrol_car.fill_up()
#print(object_petrol_car.fuel_level)
######################################################
object_hybryd_car = HybridCar(30, 50000, 'petrol')
print(object_hybryd_car.fuel_level)
object_hybryd_car.fill_up()
print(object_hybryd_car.fuel_level)
print(object_hybryd_car.battery_level)
object_hybryd_car.recharge()
print(object_hybryd_car.battery_level)