Contributing

Contributions are welcome, and they are greatly appreciated!

You can contribute in many ways:

Types of Contributions

Report Bugs

Report bugs at https://github.com/PyO3/maturin/issues.

Fix Bugs

Look through the GitHub issues for bugs. Anything tagged with bug and help wanted is open to whoever wants to implement it.

Implement Features

Look through the GitHub issues for features.

Write Documentation

Maturin could always use more documentation, whether as part of the official guide, in docstrings or even on the web in blog posts, articles and such.

Submit Feedback

The best way to send feedback is to start a new discussion at https://github.com/PyO3/maturin/discussions.

Get Started!

Ready to contribute? Here's how to setup maturin for local development.

1. Fork the maturin repository on GitHub.
2. Clone your fork locally:

   $ git clone git@github.com:your_name_here/maturin.git
   

3. Install a stable Rust toolchain and of course Python 3.6 or later is also required.
4. Create a branch for local development:

   $ cd maturin
   $ git checkout -b branch-name
   

   Now you can make your changes locally.
5. When you're done making changes, ensure the tests pass by running

   $ cargo test
   

   Note that in order to run tests you need to install virtualenv and cffi (pip3 install cffi virtualenv).
6. make sure your changes are well formatted and pass the linting checks by installing pre-commit and running

   $ pre-commit run --hook-stage manual --all
   

   running pre-commit install will enable running the checks automatically before every commit (except for the slow checks: cargo check and cargo clippy which are only run manually). You can also look at .pre-commit-config.yaml and run the individual checks yourself if you prefer.
7. Commit your changes and push your branch to GitHub:

   $ git add .
   $ git Commit
   $ git push origin branch-name
   

8. Submit a pull request through the GitHub website.

We provide a pre-configured dev container that could be used in Github Codespaces, VSCode, JetBrains, JuptyerLab.

Pull Request Guidelines

Before you submit a pull request, check that it meets these guidelines:

1. The pull request should include tests if it adds or changes functionalities.
2. Add a changelog entry.
3. When command line interface changes, run python3 test-crates/update_readme.py to update related documentation.

Code

The main part is the maturin library, which is completely documented and should be well integrable. The accompanying main.rs takes care username and password for the pypi upload and otherwise calls into the library.

The sysconfig folder contains the output of python -m sysconfig for different python versions and platform, which is helpful during development.

You need to install cffi and virtualenv (pip install cffi virtualenv) to run the tests.

You can set the MATURIN_TEST_PYTHON environment variable to run the tests against a specific Python version, for example MATURIN_TEST_PYTHON=python3.11 cargo test will run the tests against Python 3.11.

There are some optional hacks that can speed up the tests (over 80s to 17s on my machine).

1. By running cargo build --release --manifest-path test-crates/cargo-mock/Cargo.toml you can activate a cargo cache avoiding to rebuild the pyo3 test crates with every python version.
2. Delete target/test-cache to clear the cache (e.g. after changing a test crate) or remove test-crates/cargo-mock/target/release/cargo to deactivate it.
3. By running the tests with the faster-tests feature, binaries are stripped and wheels are only stored and not compressed.