How to override methods in Python

Override methods

Overriding is an important aspect of the inheritance mechanism in general. It occurs when a method from the base class has the same signature with the method from the child class.

class A: # from  w  ww .jav a  2s.c o m
    def hello(self): 
        print "Hello, I'm A." 

class B(A): 
    def hello(self): 
        print "Hello, I'm B." 

a = A() 
b = B() 
a.hello() 
b.hello() 

The code above generates the following result.

In the code above we create class B by inheriting from class A. In class A there is a method called hello. In class B we override hello method and change to display new message.