Polymorphism through inheritance in Python - Mini Project: Build & Apply

Polymorphism through inheritance

📖 Scenario: Imagine you are creating a simple program to describe different types of animals and their sounds. Each animal makes a unique sound, but they all share the ability to make a sound.

🎯 Goal: You will build a small program using inheritance where different animal classes share a common method name but behave differently. This shows polymorphism in action.

📋 What You'll Learn

Create a base class called Animal with a method make_sound.

Create two subclasses Dog and Cat that inherit from Animal.

Override the make_sound method in each subclass to print the correct animal sound.

Create instances of Dog and Cat and call their make_sound methods.

💡 Why This Matters

🌍 Real World

Polymorphism helps programmers write flexible code that can work with different types of objects in a uniform way, like handling different animals making sounds without checking their exact type.

💼 Career

Understanding polymorphism and inheritance is essential for software development jobs, especially when designing systems that need to be easily extended and maintained.

1

Create the base class Animal

Create a class called Animal with a method make_sound that prints 'Some generic sound'.

Python

# Create class Animal with method make_sound
# Your code here

Need a hint?

Use class Animal: to start the class and define make_sound with def make_sound(self):.

2

Create subclasses Dog and Cat

Create two classes called Dog and Cat that inherit from Animal. Do not add any methods yet.

Python

# Create class Dog inheriting Animal
# Create class Cat inheriting Animal
# Your code here

Need a hint?

Use class Dog(Animal): and class Cat(Animal): to inherit from Animal.

3

Override make_sound in Dog and Cat

In the Dog class, override make_sound to print 'Woof!'. In the Cat class, override make_sound to print 'Meow!'.

Python

# Override make_sound in Dog to print 'Woof!'
# Override make_sound in Cat to print 'Meow!'
# Your code here

Need a hint?

Define make_sound inside each subclass with the correct print statement.

4

Create instances and call make_sound

Create an instance called dog of class Dog and an instance called cat of class Cat. Call dog.make_sound() and cat.make_sound() to print their sounds.

Python

# Create dog and cat instances
# Call make_sound on both
# Your code here

Need a hint?

Create objects with dog = Dog() and cat = Cat(). Then call dog.make_sound() and cat.make_sound().