A very small example package to demonstrate the flit build backend and a setup.py free python package.

Roughly in this order...

python3 -m venv venv

source venv/bin/activate

This is the build backend, nothing will work without this. This is INSTEAD of setuptools. The reason is it provides a much much much simpler configuration for basic python-only packages.

pip install flit

Use the flit init tool (or copy paste an existing pyproject.toml)

flit init

So that all code changes are present in the environment immediately without having to reinstall your package. This is the equivalent of the old pip install -e .

flit install

Add these to project.dependencies in the pyproject.toml.

Unittest will auto-discover test files that are named like test*.py. See here

python -m unittest