🧠 Day 21 – OOP Mini Project in Python: Bank Account Management System

 In the last few days, we explored all the pillars of Object-Oriented Programming — from classes and constructors to inheritance and polymorphism.

Today, let's tie it all together with a mini-project that shows how OOP concepts work in real-life scenarios. We’re going to build a Bank Account Management System in Python!

                                            

🏦 What We'll Build

A small banking system where:

• You can create a bank account

• Deposit and withdraw money

• Check balance

• Use inheritance for different account types like SavingsAccount and CurrentAccount

• Use encapsulation to protect the balance

• Use polymorphism for account operations

🧱 Step 1: The Base Class – BankAccount




                        


🧬 Step 2: Using Inheritance – SavingsAccount and CurrentAccount

                


🧪 Step 3: Testing It Out

            

🔁 What You Learned in This Project

✔️ Encapsulation – balance is private
✔️ Inheritance – multiple account types extend base class
✔️ Polymorphism – withdraw behaves differently in child classes
✔️ Constructor – used to initialize each object

✔️ Objects – instances with their own data







Keep This In Mind:

                 🧡 "OOP is not just about code — it's about thinking in terms of real-world objects."