Skip to content


The latest release of formulaic is always published to the Python Package Index (PyPI), from which it is available to download @

If your Python environment is provisioned with pip, installing formulaic from the PyPI is as simple as running:

$ pip install formulaic


If you have a non-standard setup, ensure that pip above are replaced with the executables corresponding to the environment for which you are interested in installing formulaic. This is done automatically if you are using a virtual environment.

You are ready to use Formulaic. To get introduced to the concepts underpinning Formulaic, please review the Concepts documentation, or to jump straight to how to use Formulaic, please review the User Guides documentation.

Installing for development

If you are interested in developing formulaic, you should clone the source code repository, and install in editable mode from there (allowing your changes to be instantly available to all new Python sessions).

To clone the source code, run:

$ git clone


This requires you to have a GitHub account set up. If you do not have an account you can replace the SSH url above with Also, if you are planning to submit your work upstream, you may wish to fork the repository into your own namespace first, and clone from there.

To install in editable mode, run:

$ pip install -e <path_to_cloned_formulaic_repo>
You will need pip>=21.3 in order for this to work.

You can then make any changes you like to the repo, and have them be reflected in your local Python sessions. Happy hacking, and I look forward to your contributions!

Dependencies are managed using Poetry, and if you need to add a dependency, please use poetry add ..., which will ensure consistency of testing environments/etc.