🐍 Introduction to OOP

Last Updated: 05 Sept 2025

OOP = Object-Oriented Programming
👉 It is a way of writing code where we organize everything into objects (real-life entities) and classes (blueprints).

  • Class = Blueprint (design/template)
  • Object = Real entity created from that class

Hinglish Tip 🗣: class ek "ghar ka naksha" (blueprint) hai, aur Object us naksha se banaya hua asli "ghar" hai.

✏ Why OOP?

OOP helps in:

  1. Reusability → Code can be reused easily.
  2. Organization → Code is structured and easy to understand.
  3. Scalability → Easy to add new features.
  4. Real-world mapping → Works like real objects (Car, Student, BankAccount).

Six Pillars of OOP

  1. Class → Blueprint
  2. Object → Real entity
  3. Polymorphism → Different behavior
  4. Abstraction → Hide complex logic
  5. Inheritance → Reuse code
  6. Encapsulation → Data hiding

💡 Example: Without OOP vs With OOP

❌ Without OOP

# Managing student details
student1_name = "Amit"
student1_age = 20

student2_name = "Neha"
student2_age = 22

✅ With OOP

# Using class and object
class Student:
    name =""
    age = 0

# Creating objects
s1 = Student()
s2 = Student()

# Assigning values
s1.name = "Amit"
s1.age = 20

s2.name = "Neha"
s2.age = 22

print(s1.name, s1.age)  # Amit 20
print(s2.name, s2.age)  # Neha 22

Don't worry about the implementation details, we will cover in upcoming sections.

💡 Quick Practice

  • Create a class called "Person" with attributes "name" and "age".
  • Create two objects of the "Person" class and assign values to their attributes.
  • Print the values of the "name" and "age" attributes for each object.
  • Exercises
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