🏦 Secure Bank Account Management System.
A secure, console-based banking system built with Python that allows users to manage their account balance, perform transactions, and securely authenticate using a 4-digit PIN.
This project demonstrates:
Object-Oriented Programming (OOP).
File persistence using JSON
Secure authentication logic
Input validation and error handling
Professional code structure
📌 Project Overview
This application simulates a simple banking system where users can:
View account balance
Deposit funds
Withdraw funds (with balance validation)
View full transaction history
Secure their account using a PIN
All account data is stored locally in a structured JSON file.
🚀 Features 🔐 Security
4-digit PIN authentication
3 login attempts before exit
PIN stored persistently
💰 Financial Operations
Accurate money calculations using Decimal
Deposit validation (positive amounts only)
Withdrawal validation (prevents overdraft)
📂 Data Persistence
Automatically saves:
Balance
Transaction history
PIN
Uses account.json
🧾 Transaction Logging
Each transaction stores:
Type (Deposit/Withdrawal)
Amount
Timestamp
Balance after transaction
🛡 Input Handling
Accepts:
$500
1,000
1000
Prevents invalid numeric input
🛠 Technologies Used
Python 3
json module
decimal module (for financial precision)
datetime
Object-Oriented Programming principles
📦 Installation & Setup 1️⃣ Clone the Repository git clone https://github.com/yourusername/bank-account-system.git
2️⃣ Navigate Into Project Folder cd bank-account-system
3️⃣ Run the Program python bank_account.py
Works perfectly in:
✅ PyCharm
✅ VS Code
✅ Command Prompt / Terminal
🖥 Program Flow
User sets or enters a 4-digit PIN
Main menu appears
User selects an option (1–5)
Data is automatically saved after every transaction
📁 Project Structure 📦 bank-account-system ┣ 📜 bank_account.py ┣ 📜 account.json ┗ 📜 README.md
🧠 What This Project Demonstrates
✔ Clean OOP design ✔ Real-world financial logic ✔ Data persistence ✔ Error handling ✔ User authentication ✔ Clean console UI formatting
This makes it a strong beginner-to-intermediate portfolio project.
🔮 Future Improvements
🔐 Hash PIN instead of storing plain text
🖥 Add graphical user interface (Tkinter)
🌐 Convert to web app (Flask/Django)
📊 Add spending analytics
🏦 Multi-user account support
📜 License
👨💻 Author.
Allan Kamau Aspiring Software Developer GitHub: https://github.com/Allankw-dev
This project is open-source and available under the MIT License..