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CONTRIBUTING.md

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Contributing

During development you will also need the following system packages installed:

  • uv - for Python packaging.
  • Cargo - for Rust development. (These can be installed using rustup).

Local development

When making changes please remember to update the CHANGELOG.md, which follows the guidelines at keepachangelog. Add your changes to the [Unreleased] section when you create your PR.

Installation

Ensure one of the above Pythons is installed and used by the python executable:

python --version
Python 3.11.9   # or any of the supported versions

Ensure uv is installed as a system package. This can be done with pipx or Homebrew.

Then create and activate a virtual environment. If you don't have any other way of managing virtual environments this can be done by running:

uv venv
source .venv/bin/activate

You could also use virtualenvwrapper, direnv or any similar tool to help manage your virtual environments.

Once you are in an active virtual environment run

make dev

This will set up your local development environment, installing all development dependencies.

Testing (single Python version)

Run all Rust and Python tests (within your specific virtual environment) using this command:

make test

This will recompile the Rust code (if necessary) before running the tests.

Using pytest directly

You can also run tests using pytest directly (e.g. via your IDE), but you will need to recompile the Rust code after any changes, otherwise they won't get picked up. You can recompile by running:

maturin develop

Testing (all supported Python versions)

To test against multiple Python (and package) versions, we need to:

  • Have nox installed outside of the virtualenv. This is best done using pipx:

    pipx install nox

  • Ensure that all supported Python versions are installed and available on your system (as e.g. python3.10, python3.11 etc). This can be done with pyenv.

Then run nox with:

nox

Nox will create a separate virtual environment for each combination of Python and package versions defined in noxfile.py.

To list the available sessions, run:

nox --list-sessions

To run the test suite in a specific Nox session, use:

nox -s $SESSION_NAME

Static analysis

Run all static analysis tools with:

make lint

Auto formatting

Reformat code to conform with our conventions using:

make format

Dependencies

Package dependencies are declared in pyproject.toml.

  • package dependencies in the dependencies array in the [project] section.
  • development dependencies in the dev array in the [project.optional-dependencies] section.

For local development, the dependencies declared in pyproject.toml are pinned to specific versions using the requirements/development.txt lock file.

Adding a new dependency

To install a new Python dependency add it to the appropriate section in pyproject.toml and then run:

make dev

This will:

  1. Build a new version of the requirements/development.txt lock file containing the newly added package.
  2. Sync your installed packages with those pinned in requirements/development.txt.

This will not change the pinned versions of any packages already in any requirements file unless needed by the new packages, even if there are updated versions of those packages available.

Remember to commit your changed requirements/development.txt files alongside the changed pyproject.toml.

Removing a dependency

Removing Python dependencies works exactly the same way: edit pyproject.toml and then run make dev.

Updating all Python packages

To update the pinned versions of all packages simply run:

make update

This will update the pinned versions of every package in the requirements/development.txt lock file to the latest version which is compatible with the constraints in pyproject.toml.

You can then run:

make dev

to sync your installed packages with the updated versions pinned in requirements/development.txt.

Updating individual Python packages

Upgrade a single development dependency with:

uv pip compile -P $PACKAGE==$VERSION pyproject.toml --extra=dev --output-file=requirements/development.txt

You can then run:

make dev

to sync your installed packages with the updated versions pinned in requirements/development.txt.

How to release a new version to Pypi

  1. Create a new branch off the main branch.
  2. Double check that the Unreleased section of CHANGELOG.md is up to date. If it isn't, add a short summary of changes.
  3. Run the appropriate command, depending on which kind of release it is:
    • either make version_major
    • or make version_minor
    • or make version_patch.
  4. Review the commit that has just been made (note it will have updated the version based on SemVer).
  5. Push the commit, get it reviewed and merge it to main.
  6. Once it's merged, tag the merge commit and push tags:
    • git checkout main && git pull
    • git tag YOUR_VERSION (In the form v0.0.0.)
    • git push --tags
  7. Keep an eye on the release workflow which should have started. Check that it completes, and the latest version has made its way onto Pypi.