Caesar Cipher

A simple command-line Caesar Cipher tool built in Python, as part of my hands-on practice while learning to code.

What it does

Shifts each letter in a message forward or backward through the alphabet by a chosen number of positions, encrypting or decrypting the text. Non-letter characters (spaces, numbers, punctuation) stay unchanged.

What I practiced

• Loops and string iteration
• Modular arithmetic (wrapping letters around the alphabet)
• Handling uppercase and lowercase letters separately
• Basic input/output and simple CLI interaction
• Writing small, reusable functions

How to run

python caesar_cipher.py

You'll be asked to enter a message, a shift value, and whether to encrypt or decrypt.

Example