Why my_car can't be a instance of ElectricCar class

Question

class Car(object):
condition = "new"
def __init__(self, model, color, mpg):
self.model = model
self.color = color
self.mpg = mpg

def display_car(self):
return "This is a %s %s with %s MPG." %(self.color, self.model, str(self.mpg))

def drive_car(self):
self.condition = "used"

my_car = Car("DeLorean", "silver", 88)
print my_car.condition
my_car.drive_car()
print my_car.condition

class ElectricCar(Car):
def __init__(self, battery_type):
self.battery_type = battery_type

my_car = ElectricCar( "jaguar", "red", 52 ,"molten salt")

Answer 1

in your ElectricCar class you have to specify that you're inheriting and what you're inheriting from the car class. here's a simple explanation:

http://www.python-course.eu/python3_inheritance.php

Answer 2

when you redefine the __init__ method in the child class, you are modifying property of parent class method. my_car is a instance of ElecrticCar subclass but as you have modified the parent class method , you can't access those properties.