Contributions are welcome, and they are greatly appreciated! Every little bit helps, and credit will always be given.

You can contribute in many ways:

Types of Contributions

Report Bugs

Report bugs at

If possible, provide a minimal derex project to trigger the bug.

Submit Feedback

The best way to send feedback is to file an issue at

If you are proposing a feature:

  • Explain in detail how it would work.

  • Keep the scope as narrow as possible, to make it easier to implement.

  • Remember that this is a volunteer-driven project, and that contributions are welcome :)

Get Started!

Ready to contribute? Here’s how to set up derex.runner for local development.

  1. Fork the derex.runner repo on GitHub.

  2. Clone your fork locally:

    $ git clone
  3. Activate a virtualenv for this project (we recommend direnv) and install derex.runner there:

    $ cd derex.runner/
    $ direnv allow  # Or, alternatively, activate a pristine python>=3.6 virtualenv
    $ pip install -r requirements_dev.txt -e .
    $ python develop
  4. Install git pre commit hooks:

    $ pre-commit install
  5. Create a branch for local development:

    $ git checkout -b name-of-your-bugfix-or-feature

    Now you can make your changes locally.

  6. When you’re done making changes, check that all tests still pass:

    $ pytest -m "not slowtest"  # will run only the faster tests
    $ pytest -m "slowtest"  # will run only the slow tests
  7. Commit your changes and push your branch to GitHub:

    $ git add .
    $ git commit -m "Your detailed description of your changes."
    $ git push origin name-of-your-bugfix-or-feature
  1. Submit a pull request through the GitHub website.

Pull Request Guidelines

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

  1. The pull request should include tests.

  2. If the pull request adds functionality, the docs should be updated. Put your new functionality into a function with a docstring, and add the feature to the list in README.rst.


A reminder for the maintainers on how to deploy. Make sure all your changes are committed (including an entry in HISTORY.rst). Then run:

$ bumpversion patch # possible: major / minor / patch
$ git push
$ git push --tags