Banking System — OOP Prototype (main branch)

A terminal-based banking system built with pure Python OOP — no database, no external dependencies. All data lives in memory during the session.

Project Structure

banking-system/
├── main.py          # Entry point — CLI menu
├── bank.py          # Bank class — manages users in memory
├── user.py          # User, Client, Admin classes
├── account.py       # Account class — deposit / withdraw / balance
└── exceptions.py    # Custom exceptions

Class Diagram

User
├── Client  →  has one Account
└── Admin

Bank  →  manages a list of Users

Features

• Create clients
• Create bank accounts per client
• Deposit and withdraw funds
• Check balance
• List all registered users
• Custom exception handling for all edge cases

How to Run

python main.py

No installation required — uses only the Python standard library.

OOP Concepts Applied

Concept	Where
Inheritance	Client, Admin extend User
Encapsulation	Bank._users is private; access via methods
Custom Exceptions	exceptions.py
Composition	Client contains an Account

Notes

• This is a prototype — data is not persisted between runs.
• See the database branch for the full version with MySQL persistence.