An end-to-end Object-Oriented Programming (OOP) based command-line e-commerce simulator, built with Python. This project demonstrates encapsulation, inheritance, polymorphism, and file handling, creating a complete e-commerce simulation.

A. Features:

• View available products
• Add products to a shopping cart
• Apply discounts (Flat / Percentage)
• Process payments (Credit Card / PayPal)
• Load products from a .txt file
• Save orders to an order log file
• Exception handling for stock availability and invalid inputs

B. OOP Concepts Used: Concepts:

• Encapsulation: Private product, order, and customer data in classes
• Inheritance: CreditCardPayment, PayPalPayment inherit from Payment
• Polymorphism: apply_discount() and process_payment() method overriding
• Abstraction: Simplified CLI hiding internal class structure

C. Project Structure:

E-shopping/
├── main.py               # Main CLI program
├── product.py             # Product class + file loader
├── customer.py            # Customer & Cart classes
├── payment.py             # Payment classes
├── discount.py            # Discount strategy classes
├── order.py               # Order generation & saving
├── products.txt           # Product database
└── orders.txt             # Auto-generated order summaries

D. Example Products (products.txt)

101,Laptop,60000,10,Electronics,High-end gaming laptop
102,Python Book,500,50,Books,Programming basics
103,Headphones,1500,20,Electronics,Noise cancelling
104,Smartphone,45000,8,Electronics,Latest model with 5G support

E. ▶️ Getting Started

1. Clone the Repo:

git clone https://github.com/your-username/e-shopping-simulator.git
cd e-shopping-simulator

2. Run the Application:

python main.py

F. Example CLI Usage:

--- E-Commerce CLI Menu ---
1. View Products
2. Add to Cart
3. View Cart
4. Checkout
5. Exit

Enter your choice: 1

G. Order History Example (orders.txt)

Customer: Pearl, Total: ₹54000.0, Payment: PayPal
Laptop x 1
Headphones x 2

H. Built With:

1. Python 3.x
2. Object-Oriented Programming (OOP)
3. File I/O
4. Simple CLI Interface