Python OOP Basics

1. What is OOP?

OOP means Object-Oriented Programming.

In simple words:
👉 OOP is a way to write programs using objects
👉 Objects are made from classes
👉 It helps keep code clean, organized, and reusable

2. Real-Life Example (Easy)

Think about a car 🚗

• Car has properties → color, brand, speed

• Car has actions → start, stop, move

In Python:

• Properties = variables

• Actions = functions (methods)

3. What is a Class?

A class is a blueprint or template.

In simple words:
👉 Class tells how an object should look and work

Example: Create a Class

4. What is an Object?

An object is a real thing created from a class.

Example: Create an Object

5. Class with Function (Method)

A method is a function inside a class.

Example

👉 self means current object.

6. The __init__() Function (Constructor)

__init__() runs automatically when an object is created.

Example

7. Instance Variables vs Class Variables

Example

8. Modify Object Properties

Example

9. Delete Object Properties or Object

Example

10. Simple OOP Example (Calculator)

Example

11. Why Use OOP?

✔ Code is reusable
✔ Easy to understand
✔ Easy to maintain
✔ Used in real projects

12. Common Beginner Mistakes

❌ Forgetting self

❌ Wrong.

✔ Correct:

❌ Calling Method Without Object

❌ Wrong.

13. Simple Practice Examples

Example 1: Dog Class

Example 2: Bank Account

Example 3: Student Info

14. Summary (Python OOP Basics)

✔ OOP uses classes and objects
✔ Class is a blueprint
✔ Object is a real instance
✔ self refers to object
✔ __init__() initializes data

📘 Perfect for Beginner eBook

This chapter is ideal for:

• Python beginner books

• School & college students

• Self-learners

If you want next, I can write:

• OOP Pillars (Inheritance, Encapsulation, Polymorphism)

• Class vs Object (deep)

• Real OOP Projects

Just tell me 😊