📘 Lesson · Lesson 86

Inheritance & Polymorphism

Two OOP Pillars

💡 At a Glance

Inheritance lets a class reuse another's code. Polymorphism lets the same method behave differently in different classes.

Inheritance

Python

class Animal:
    def sound(self):
        print("Some sound")

class Dog(Animal):       # Dog inherits Animal
    def sound(self):     # overrides parent
        print("Bark")

d = Dog()
d.sound()

Bark

Polymorphism

Python

class Cat:
    def sound(self): print("Meow")
class Cow:
    def sound(self): print("Moo")

for animal in [Cat(), Cow()]:
    animal.sound()   # same call, different result

Meow Moo

Summary

Inheritance reuses parent code; child can override methods.
Polymorphism = same method name, different behavior per class.

दो OOP स्तंभ

💡 एक नज़र में

Inheritance एक class को दूसरी का code reuse करने देता है। Polymorphism एक ही method को अलग classes में अलग व्यवहार करने देता है।

Inheritance

Python

class Animal:
    def sound(self):
        print("Some sound")

class Dog(Animal):       # Dog, Animal को inherit करता है
    def sound(self):     # override करता है
        print("Bark")

d = Dog()
d.sound()

Bark

Polymorphism

Python

class Cat:
    def sound(self): print("Meow")
class Cow:
    def sound(self): print("Moo")

for animal in [Cat(), Cow()]:
    animal.sound()   # एक ही call, अलग result

Meow Moo

सारांश

Inheritance parent code reuse करता; child methods override कर सकता है।
Polymorphism = एक method नाम, हर class में अलग व्यवहार।

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