Tutorial 3 : OOPs in Python — Inheritance

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In this tutorial we will cover following topics :

Terminologies

Three purposes of Inheritance

Examples

Multiple inheritance

Terminologies :

1) Inheritance

• one class inherits the attributes and methods of another class

2) Parent class

• the class whose properties and methods are inherited

3) Child/Derived class

• the class that inherits the properties from the parent class
• a child class can have its own properties and methods

Three purposes of Inheritance :

• overwriting the method of parent class in a derived class
• defining new method in a derived class
• calling the methods of parent class for a derived class object even if that method is not defined in a derived class

Example 1 :

Let’s first define a parent class and create it’s object :

Now let’s define a derived class and inherit the parent class methods in it and see if all the aforementioned purposes are really getting served :

So we can clearly see that all the purposes are served using inheritance.

Example 2 :

Let’s first define a parent class and create it’s object :

Now let’s define a derived class and inherit the parent class methods in it and see if all the aforementioned purposes are really getting served :

Example 3 :

Let’s first define a parent class and create it’s object :

Now let’s define a derived class and inherit the parent class methods in it and see if all the aforementioned purposes are really getting served :

Multiple inheritance :

Congratulations !!

You have completed third tutorial. We will learn Polymorphism in next tutorial.

Take a deep breathe and move to the next tutorial.