Method overriding in python

Method overriding:

• Defining a method in the Child class with same name and same set of arguments of Parent class method.
• When two methods in Parent and Child with the same identity, it gives the first priority to Child object.

class Parent:
    def fun(self):
        print("Parent's fun()")
        return

class Child(Parent):
    def fun(self): #override
        print("Child's fun()")
        return

class Inheritance:
    def main():
        obj = Child()
        obj.fun()
        return

Inheritance.main()

When we access the functionality using Child object, it is looking for Child object first, if it is not available in Child, then it looks into Parent class.

class Parent:
    def m1(self):
        print("Parent's m1()")
        return

    def m2(self):
        print("Parent's m2()")
        return

class Child(Parent):
    def m2(self): #override
        print("Child's m2()")
        return

class Inheritance:
    def main():
        obj = Child()
        obj.m1()
        obj.m2()
        return

Inheritance.main()

Advantage of overriding:

• Overriding is the concept of updating existing object functionality when it is not sufficient to extended object.
• Re-writing the function logic with the same identity.

Complete Inheritance with Code program:

# 1. Accessing existing functionality
# 2. Adding new features
# 3. Update(override) existing features

class Guru:
    def call(self):
        print("Guru - Call")
        return
    def camera(self):
        print("Guru - Camera - 2MP")
        return

class Galaxy(Guru):
    def videoCall(self):
        print("Galaxy - Video Call")
        return
    def camera(self):
        print("Galaxy - Camera - 8MP")
        return
    
class Inheritance:
    def main():
        g1 = Galaxy()
        g1.call()# Access existing
        g1.videoCall()# new feature
        g1.camera() #updated

        g2 = Guru()
        g2.call()
        g2.camera()
        g2.videoCall() # error:
        return

Inheritance.main()