This practical book is for Python learners who want to deeply understand Object Oriented Programming. You will work through 200 exercises that guide you from the basics to more advanced OOP topics, including classes, methods, inheritance, method overloading, serialization, and class methods. Each chapter includes examples, clear explanations, and exercises with solutions. This is not just a theory book, it is a workbook for anyone who wants to use OOP in real Python projects, improve their coding structure, or prepare for technical interviews.