Simple ATM System - Python CLI Project

This is a simple ATM System simulation built in Python. The user logs in using a secure 4-digit PIN and can perform basic banking operations like checking balance, depositing, and withdrawing money — all through a command-line interface.

Great for beginners to practice Python functions, loops, and input validation in a real-world simulation.

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Features

• Secure PIN-based login (with 3 attempt limit)
• Balance inquiry
• Deposit money
• Withdraw money (with balance validation)
• Menu repeats until user chooses to exit
• Input validation and error handling

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Requirements

• Python 3.6 or higher

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Concepts Used

• if-else conditions
• while loops
• User-defined functions
• try-except for input validation
• f-string formatting (e.g., ₹{balance:.2f})

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How to Run

1. Make sure Python is installed.
2. Clone or download this repository.
3. Open terminal or command prompt.
4. Navigate to the project folder and run:

python main.py

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Example Output

Enter your 4-digit PIN: 1234 Login successful!

------ ATM Menu ------

1. Check Balance
2. Deposit Money
3. Withdraw Money
4. Exit

Enter your choice (1-4): 2 Enter amount to deposit: ₹500 ₹500.00 deposited successfully.

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Author

Sandesh Salokhe
GitHub: @Sandesh-008