Object-Oriented Programming (OOP) is a paradigm built around classes (blueprints) and objects (instances). It organizes code to make it modular, reusable, and scalable.
Key Concepts of OOPS
Class: A blueprint or template for creating objects (defines attributes and methods).
Object: An instance of a class containing real values instead of placeholders.
__init__() Method: The constructor method automatically executed when an object is created.
self Parameter: Refers to the current instance of the class, allowing access to its attributes and methods.
The 4 Core Pillars
Encapsulation: Restricting direct access to data by bundling data (attributes) and methods into a single unit.
Abstraction: Hiding complex implementation details and showing only the essential features to the user.
Inheritance: Allowing a child class to inherit properties and methods from a parent class to promote code reuse.
Polymorphism: Allowing different classes to use the same method name while responding in their own specific way (e.g., method overriding).
Why Use OOP?
Modularity: Code is organized into neat, independent sections.
Reusability: Inheritance allows you to reuse code without rewriting it.
Maintainability: Easier to debug, update, and scale large projects.
Why OOPS in Python?
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OOPS (Object-Oriented Programming System) is used in Python to make code organized, reusable, secure, and easy to maintain. It groups data and functions into classes and objects, reducing code duplication and making programs easier to develop and manage.
Why Use OOP in Python?
Code Reusability: Inheritance avoids duplicate code by letting new classes use existing logic.
Easy Maintenance & Security: Encapsulation keeps bugs isolated and protects sensitive data from unintended access.
Simplified Complexity: Abstraction hides internal implementation details so you only work with what matters.
Flexibility & Scalability: Polymorphism allows a single interface for different types, making large applications easier to expand and manage.
Functions (Methods) in OOPS
The main functions (methods) used in OOPS are:
__init__() (Constructor) – Initializes an object when it is created.
ex: class Student:
def __init__(self, name):
self.name = name
Instance Method — Works with object data using the self parameter.
Class Method — Works with class variables using the @classmethod decorator.
Static Method — Performs utility tasks and does not use self or cls.
