Tirsvad-Udemy-100_days_of_code/008-caesar_cipher
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Add decrypt function to Caesar cipher

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- Implement decrypt function that reverses encryption with negative
  shift
- Export decrypt in package's public API
- Update tests with basic roundtrip and edge case tests
- Update documentation to reflect encryption/decryption support
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Tirsvad
2026-10-04 13:18:33 +08:00
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commit 621f5f7272
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README.md
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# 🔐 Caesar Cipher
A beginner-friendly Python program that encodes messages with the Caesar cipher.
A beginner-friendly Python program that encodes and decodes messages with the Caesar cipher.
## 📚 Table of Contents
@@ -14,7 +14,7 @@ A beginner-friendly Python program that encodes messages with the Caesar cipher.
## 🧭 Overview
The Caesar cipher shifts every letter by a fixed number of places (with a shift of 3, `E` becomes `H`). This project, from Udemy's *100 Days of Code: The Complete Python Pro Bootcamp* (Day 8), finds letter positions with `list.index` and wraps around the alphabet with the modulo operator. Part 1 covers encryption; decryption and a combined program follow in later parts. Code lives in `src/`, tests in `tests/`, docs in `docs/`.
The Caesar cipher shifts every letter by a fixed number of places (with a shift of 3, `E` becomes `H`). This project, from Udemy's *100 Days of Code: The Complete Python Pro Bootcamp* (Day 8), finds letter positions with `list.index` and wraps around the alphabet with the modulo operator. Parts 1 and 2 cover encryption and decryption; a combined program follows in Part 3. Code lives in `src/`, tests in `tests/`, docs in `docs/`.
## 📋 Requirements