9. Car Class Inheritance

Write a child class of the Car class, ElectricCar.

Set the car’s make, model, year, colour.

The child class, ElectricCar, has a unique attribute, battery_size, and unique method, get_battery_info.

The child class, ElectricCar, has a method, fill_tank, which overrides the method of the same name in its parent’s class.

Output:

2019 Grey Tesla Model S

This car has a 90-kWh battery.

Electric car’s don’t have a tank.

Tasks

1. Write a ElectricCar class as a child class of the Car class using the scaffold below.

   class Car:
   
       def __init__(self, make, model, year, colour):
           self.make = make
           self.model = model
           self.year = year
           self.colour = colour
           self.odometer_reading = 0
   
       def get_info(self):
           return f"{self.year} {self.colour} {self.make} {self.model}".title()
   
       def get_odometer(self):
           print(f"{self.get_info()} has done {self.odometer_reading} km.")
   
       def update_odometer(self, km):
           if km >= self.odometer_reading:
               self.odometer_reading = km
           else:
               print("Km on an odometer can't be lowered.")
   
       def increment_odometer(self, km):
           if km >= 0:
               self.odometer += km
           else:
               print("Km on an odometer can't be lowered.")
   
       def fill_tank(self):
           print("Tank is full.")
   
   
   class ElectricCar(     ):
       """ElectricCar child of Car class."""
   
       def __init__(       , make, model, year, colour,          ):
           """
           Initialize attributes of the parent class.
           Then initialize attributes specific to an electric car.
           """
                  .__init__(make, model, year, colour)
           self.battery_size
   
       def get_battery_info(      ):
           print(f"This car has a {self.             }-kWh battery.")
   
       def fill_tank(     ):
           """Override parent method"""
           print("No tank in this electric car.")
   
   my_tesla = ElectricCar('tesla', 'model S', 2019, "grey", 90)
   print(my_tesla.get_info())
   my_tesla.get_battery_info()
   my_tesla.fill_tank()
   

Q1

Write an ElectricCar class as a child class of the Car class.

class Car:

    def __init__(self, make, model, year, colour):
        self.make = make
        self.model = model
        self.year = year
        self.colour = colour
        self.odometer_reading = 0

    def get_info(self):
        return f"{self.year} {self.colour} {self.make} {self.model}".title()

    def get_odometer(self):
        print(f"{self.get_info()} has done {self.odometer_reading} km.")

    def update_odometer(self, km):
        if km >= self.odometer_reading:
            self.odometer_reading = km
        else:
            print("Km on an odometer can't be lowered.")

    def increment_odometer(self, km):
        if km >= 0:
            self.odometer += km
        else:
            print("Km on an odometer can't be lowered.")

    def fill_tank(self):
        print("Tank is full.")


class ElectricCar(Car):
    """ElectricCar child of Car class."""

    def __init__(self, make, model, year, colour, battery_size):
        """
        Initialize attributes of the parent class.
        Then initialize attributes specific to an electric car.
        """
        super().__init__(make, model, year, colour)
        self.battery_size = battery_size

    def get_battery_info(self):
        print(f"This car has a {self.battery_size}-kWh battery.")

    def fill_tank(self):
        """Override parent method"""
        print("No tank in this electric car.")

my_tesla = ElectricCar('tesla', 'model S', 2019, "grey", 90)
print(my_tesla.get_info())
my_tesla.get_battery_info()
my_tesla.fill_tank()