10. Car Class Composition

Write a child class of the Car class, ElectricCar.

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

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

The child class, ElectricCar, assigns an instance of the Battery class to the battery attribute.

Complete the code to output:

2019 Grey Tesla Model S

This car has a 90-kWh battery.

This car can go about 480 km on a full charge.

Tasks

1. Write a Battery class to be assigned to a variable in the ElectricCar 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 Battery:
       """To be assigned to an attribute in the ElectricCar class"""
   
       def __init__(self, battery_size=75):
           """Initialize the battery's attributes."""
           self.battery_size = battery_size
   
       def get_battery_info(self):
           print(f"This car has a {self.battery_size}-kWh battery.")
   
       def get_range(self):
           if self.battery_size == 75:
               range = 430
           elif self.battery_size == 90:
               range = 480
           elif self.battery_size == 100:
               range = 500
           print(f"This car can go about {range} km on a full charge.")
   
   
   class ElectricCar(Car):
       """ElectricCar child of Car class."""
   
       def __init__(self, make, model, year, colour,          ):
           super().__init__(make, model, year, colour)
           self.battery =
   
       def fill_tank(self):
           """Override parent method"""
           print("No tank in this electric car.")
   
   my_tesla = ElectricCar(make='tesla', model='model S', year=2019, c=olour"grey", battery_size=90)
   print(my_tesla.get_info())
   my_tesla.battery.get_battery_info()
   my_tesla.battery.get_range()
   

Q1

Write a Battery class to be assigned to a variable in the ElectricCar 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 Battery:
    """To be assigned to an attribute in the ElectricCar class"""

    def __init__(self, battery_size=75):
        """Initialize the battery's attributes."""
        self.battery_size = battery_size

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

    def get_range(self):
        if self.battery_size == 75:
            range = 430
        elif self.battery_size == 90:
            range = 480
        elif self.battery_size == 100:
            range = 500
        print(f"This car can go about {range} km on a full charge.")


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

    def __init__(self, make, model, year, colour, battery_size):
        super().__init__(make, model, year, colour)
        self.battery = Battery(battery_size)

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

my_tesla = ElectricCar(make='tesla', model='model S', year=2019, c=olour"grey", battery_size=90)
print(my_tesla.get_info())
my_tesla.battery.get_battery_info()
my_tesla.battery.get_range()