How to override class methods in Python?

Overriding is the property of a class to change the implementation of a method provided by one of its base classes.

Overriding is a very important part of OOP since it makes inheritance utilize its full power. By using method overriding a class may "copy" another class, avoiding duplicated code, and at the same time enhance or customize part of it. Method overriding is thus a part of the inheritance mechanism.

In Python method overriding occurs by simply defining in the child class  a method with the same name of a method in the parent class. When you  define a method in the object you make this latter able to satisfy that  method call, so the implementations of its ancestors do not come in  play.

class Parent(object):
     def __init__(self):
         self.value = 4
     def get_value(self):
         return self.value
 
class Child(Parent):
     def get_value(self):
         return self.value + 1
 

Now Child objects behave differently

>>> c = Child()
>>> c.get_value()
5

Rajendra Dharmkar

Published on 16-Jan-2018 14:09:06

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