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# Patsy
**Notice:** `patsy` is no longer under active development. As of August 2021,
Matthew Wardrop (@matthewwardrop) and Tomás Capretto (@tomicapretto) have taken
on responsibility from Nathaniel Smith (@njsmith) for keeping the lights on, but
no new feature development is planned. The spiritual successor of this project
is [Formulaic](https://github.com/matthewwardrop/formulaic), and we
recommend that users [migrate](https://matthewwardrop.github.io/formulaic/migration/)
when possible. For the time being, until major software packages have successfully
transitioned, we will attempt to keep `patsy` working in its current state with
current releases in the Python ecosystem.
---
Patsy is a Python library for describing statistical models
(especially linear models, or models that have a linear component) and
building design matrices. Patsy brings the convenience of [R](http://www.r-project.org/) "formulas" to Python.
[](https://pypi.org/project/spec-classes/)
[](https://coveralls.io/github/pydata/patsy)
- **Documentation:** <https://patsy.readthedocs.io/>
- **Downloads:** <http://pypi.python.org/pypi/patsy/>
- **Code and issues:** <https://github.com/pydata/patsy>
- **Mailing list:** <pydata@googlegroups.com> (<http://groups.google.com/group/pydata>)
## Dependencies
* Python (3.6+)
* numpy
* Optional:
* pytest/pytest-cov: needed to run tests
* scipy: needed for spline-related functions like ``bs``
## Installation
``pip install patsy`` (or, for traditionalists: ``python setup.py install``)
## License
2-clause BSD, see LICENSE.txt for details.
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