A console tool that spells a word with the NATO phonetic alphabet, the Day 26 assignment of Udemy's "100 Days of Code: The Complete Python Pro Bootcamp". It is written for fellow course participants and GitHub visitors who want a readable, tested, runnable solution that uses list and dictionary comprehensions and has no runtime dependencies.

🧭 Overview

You type a word, the program prints the NATO code word of each letter. A character that is not a letter makes it ask again.

Enter a word: Hello
Phonetic code words:
Hotel
Echo
Lima
Lima
Oscar

How it works, in the course's terms:

load_nato_dict reads the supplied CSV file and builds the letter-to-code-word dictionary with a dictionary comprehension.
generate_phonetic turns a word into its code words with a list comprehension.
The standard library csv module replaces Pandas, so the project has no runtime dependencies (see the architecture decision record ADR-0001).

The wiki explains installation, usage and development in English, Danish and Bahasa Malaysia: wiki.

📋 Requirements

Python 3.13 or newer, with the venv module.
Git, to clone the repository.
Optional: Doxygen to build the source documentation.

The program itself needs no packages. The development tools (pytest, ruff, mypy, import-linter) are installed by the dev extra.

🛠️ Setup

Clone the repository, then create a local virtual environment named .venv in its root, upgrade pip and install the project in editable mode with its development tools.

Windows PowerShell

git clone https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/026-nato-alphabet.git
cd 026-nato-alphabet
py -3.13 -m venv .venv
.\.venv\Scripts\Activate.ps1
python -m pip install --upgrade pip
python -m pip install -e ".[dev]"

If PowerShell refuses to run the activation script, allow it for this window only with Set-ExecutionPolicy -Scope Process RemoteSigned.

Linux Debian

sudo apt install git python3 python3-venv
git clone https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/026-nato-alphabet.git
cd 026-nato-alphabet
python3 -m venv .venv
source .venv/bin/activate
python -m pip install --upgrade pip
python -m pip install -e ".[dev]"

Debian 13 (trixie) ships Python 3.13. On an older release install Python 3.13 first (for example with pyenv).

MacOS

brew install python@3.13 git
git clone https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/026-nato-alphabet.git
cd 026-nato-alphabet
python3.13 -m venv .venv
source .venv/bin/activate
python -m pip install --upgrade pip
python -m pip install -e ".[dev]"

▶️ Run

With the virtual environment active:

python -m nato_alphabet

or, as the installed command:

nato-alphabet

An invalid character asks for the word again:

🧪 Tests

Run the tests with the virtual environment active:

python -m pytest

The same checks that CI runs:

python -m ruff check .
python -m mypy
lint-imports

🔄 Continuous integration

The workflow .gitea/workflows/ci.yml runs on every push to main or a mil-* branch and on every pull request that touches source, tests or configuration. It sets up Python 3.13, creates a virtual environment, installs the project with the dev extra, and runs ruff, mypy and pytest.

📖 Build the source documentation

The source is documented with Doxygen comments. From the repository root:

doxygen Doxyfile

Open build/html/index.html in a browser. The build/ folder is ignored by git.

🗂️ Project layout

src/nato_alphabet/
  constants.py        every literal of the program
  main.py             composition root and entry point
  __main__.py         python -m nato_alphabet
  domain/             the spelling rule (no input or output)
  application/        the use case and its ports
  adapters/           CSV reader and console
  data/               nato_phonetic_alphabet.csv
tests/                pytest tests, mirroring src/
docs/                 project documents (see the appendix)
wiki/                 wiki pages in en, da and ms
.gitea/workflows/     CI workflow
pyproject.toml        project configuration
Doxyfile              Doxygen configuration

📄 License

GNU Affero General Public License v3.0 or later. See LICENSE.

🔗 Links

📎 Appendix: Project documents

The documents a newcomer needs, in reading order.

Document	What it tells you
AGENTS.md	The rules AI agents follow in this repository
Business Case	Why the project exists, its scope and success criteria
Stakeholder Analysis	Who is involved; the stakeholder IDs used for owners and reviewers
Project Plan	The gateways and their schedule
Milestones	One document per gateway: Go/No-Go criteria and tasks
Architecture decisions	Why the data is read with the standard library and which analysis documents were skipped
Artifact registry	Where each artifact type lives, the next version, the PO language and domain
Traceability matrix	How the artifacts link and when each was last reviewed
Framework README	The framework this project uses
Framework changelog	What changed in each framework release