What is Inheritance (Is-A Relation)?
It is a concept of Object-Oriented Programming. Inheritance is a mechanism that allows us to inherit all the properties from another class. The class from which the properties and functionalities are utilized is called the parent class (also called as Base Class). The class which uses the properties from another class is called as Child Class (also known as Derived class). Inheritance is also called an Is-A Relation.
Inheritance – diagrammatic representation
In the figure above, classes are represented as boxes. The inheritance relationship is represented by an arrow pointing from Derived Class(Child Class) to Base Class(Parent Class). The extends keyword denotes that the Child Class is inherited or derived from Parent Class.
Syntax :
# Parent class
class Parent :
# Constructor
# Variables of Parent class
# Methods
...
...
# Child class inheriting Parent class
class Child(Parent) :
# constructor of child class
# variables of child class
# methods of child class
...
...
Example :
Python3
# parent class class Parent: # parent class method def m1(self): print('Parent Class Method called...') # child class inheriting parent class class Child(Parent): # child class constructor def __init__(self): print('Child Class object created...') # child class method def m2(self): print('Child Class Method called...') # creating object of child class obj = Child() # calling parent class m1() method obj.m1() # calling child class m2() method obj.m2() |
Child Class object created... Parent Class Method called... Child Class Method called...
Inheritance and Composition in Python
Prerequisite – Classes and Objects in Python
This article will compare and highlight the features of is-a relation and has-a relation in Python.
Contact Us