How to resolve 'HybridVehicle.init() missing 1 required positional argument' in Python 3.x?

Question

Created a Base class 'Vehicle' having attributes make, model, and year

class Vehicle:

    def __init__(self, make, model, year):
        self.make = make
        self.model = model
        self.year = year

    def start(self):
        print("Starting the vehicle.")

    def stop(self):
        print("Stopping the vehicle.")

    def accelerate(self):
        print("Accelerating the vehicle.")

    def brake(self):
        print("Applying brakes.")

Now Created a Sub-class named ElectricVehicle having attribute battery_capacity

class ElectricVehicle(Vehicle):

    def __init__(self, make, model, year, battery_capacity):
        super().__init__(make, model, year)
        self.battery_capacity = battery_capacity

    def charge(self):
        print("Charging the battery.")

    def check_battery(self):
        print("Checking the battery level.")

Now Created a Sub-class named HybridVehicle having attribute fuel_capacity

class HybridVehicle(Vehicle):

    def __init__(self, make, model, year, fuel_capacity):
        super().__init__(make, model, year)
        self.fuel_capacity = fuel_capacity

    def refuel(self):
        print("Refueling the vehicle.")

    def check_fuel(self):
        print("Checking the fuel level.")

Finally Created class HybridElectricVehicle and inherited ElectricVehicle and HybridVehicle

class HybridElectricVehicle(ElectricVehicle, HybridVehicle):

    def __init__(self, make, model, year, battery_capacity, fuel_capacity, additional_property):
        super().__init__(make, model, year, battery_capacity)
        HybridVehicle.__init__(self, make, model, year, fuel_capacity)
        self.additional_property = additional_property

Creating an instance of HybridElectricVehicle

hybrid_electric_car = HybridElectricVehicle("Tesla", "Model 3", 2023, 75, 10, 'additional_property')
`

In this code i'm facing this error:

Traceback (most recent call last):

  File "multiple inheritance 2.py", line 52, in <module>

hybrid_electric_car = HybridElectricVehicle("Tesla", "Model 3", 2023, 75, 10, 'additional_property')
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  File "multiple inheritance 2.py", line 46, in __init__
    super().__init__(make, model, year, battery_capacity)
  File multiple inheritance 2.py", line 22, in __init__
    super().__init__(make, model, year)

TypeError: HybridVehicle.__init__() missing 1 required positional argument: 'fuel_capacity'

Missing is additional_property should be added. – toyota Supra May 29 '23 at 13:50 — toyota Supra, May 29 '23 at 13:50

score 0 · Answer 1 · answered May 29 '23 at 12:40

The traceback is showing you that super().__init__ is calling HybridVehicle.__init__, which requires a fuel_capacity.

You've only passed make, model, year, and battery capacity

Both inherited class constructors will be called. What does 'super' do in Python? - difference between super().__init__() and explicit superclass __init__()

How to resolve 'HybridVehicle.__init__() missing 1 required positional argument' in Python 3.x?

1 Answers1

How to resolve 'HybridVehicle.init() missing 1 required positional argument' in Python 3.x?