A Turtle Crossing game, the Day 23 capstone of Udemy's 100 Days of Code: The Complete Python Pro Bootcamp. Steer the turtle north across a busy road of randomly generated cars. Each crossing raises the level and the car speed; one collision ends the game. Written with the Python standard library only.

Requirements

Python 3.13 or newer, with tkinter (the turtle module needs it).
git to clone the repository.
pytest for the tests (development only; the game has no runtime dependencies).
Optional: Doxygen to build the source documentation.

Set up

Clone the repository and create a local virtual environment named .venv in the project folder. Upgrade pip first, then install the development dependencies from pyproject.toml.

Windows powershell

git clone https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/023-turtle-crossing.git
cd 023-turtle-crossing
py -3.13 -m venv .venv
.\.venv\Scripts\Activate.ps1
python -m pip install --upgrade pip
python -m pip install --group dev

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

Linux debian

sudo apt update && sudo apt install -y git python3.13 python3.13-venv python3-tk
git clone https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/023-turtle-crossing.git
cd 023-turtle-crossing
python3.13 -m venv .venv
source .venv/bin/activate
python -m pip install --upgrade pip
python -m pip install --group dev

If python3.13 is not in your distribution, install Python 3.13 with your preferred tool (for example pyenv) and run the same venv command with it.

MacOS

brew install python@3.13 python-tk@3.13 git
git clone https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/023-turtle-crossing.git
cd 023-turtle-crossing
python3.13 -m venv .venv
source .venv/bin/activate
python -m pip install --upgrade pip
python -m pip install --group dev

Run

Activate the .venv, then start the game from the project root:

python src/main.py

Press the Up arrow key to move the turtle forward. Reaching the top edge returns the turtle to the start and speeds up the cars. A collision shows GAME OVER; click the window to close it.

Run the tests

With the .venv active:

python -m pytest

Tests that need a window are skipped automatically when no display is available. On a headless Linux machine run xvfb-run python -m pytest.

Continuous integration

.gitea/workflows/ci.yml runs on every push to main and on every pull request. It sets up Python 3.13, upgrades pip, installs the development dependencies and runs pytest under a virtual display.

Build the source documentation

The source uses Doxygen comments and the Doxyfile in the project root.

doxygen Doxyfile

Open docs/api/html/index.html in a browser.

Project layout

.
├── src/            game source
│   ├── main.py         screen, objects and the game loop
│   ├── constants.py    every constant
│   ├── player.py       Player
│   ├── car_manager.py  CarManager
│   ├── car_shape.py    how a car is drawn
│   ├── collision.py    collision test
│   └── scoreboard.py   Scoreboard
├── tests/          pytest tests
├── docs/           planning and review documents (business case, plan, milestones, reviews)
│   └── images/         screenshots used by the README and the wiki
├── wiki/           wiki pages in English, Danish (-da) and Bahasa Malaysia (-ms)
├── Doxyfile        Doxygen configuration
├── pyproject.toml  project configuration and development dependencies
└── .gitea/         continuous integration workflow

All constants live in src/constants.py.

License

GNU Affero General Public License v3.0, see LICENSE.