The uncompromising code formatter

“Any color you like.”

By using Black, you agree to cede control over minutiae of hand-formatting. In return, Black gives you speed, determinism, and freedom from pycodestyle nagging about formatting. You will save time and mental energy for more important matters.

Black makes code review faster by producing the smallest diffs possible. Blackened code looks the same regardless of the project you’re reading. Formatting becomes transparent after a while and you can focus on the content instead.

Try it out now using the Black Playground.

Note - Black is now stable!

Black is successfully used by many projects, small and big. Black has a comprehensive test suite, with efficient parallel tests, our own auto formatting and parallel Continuous Integration runner. Now that we have become stable, you should not expect large changes to formatting in the future. Stylistic changes will mostly be responses to bug reports and support for new Python syntax.

Also, as a safety measure which slows down processing, Black will check that the reformatted code still produces a valid AST that is effectively equivalent to the original (see the Pragmatism section for details). If you’re feeling confident, use --fast.

Note

Black is licensed under the MIT license.

Testimonials

Mike Bayer, author of SQLAlchemy:

I can’t think of any single tool in my entire programming career that has given me a bigger productivity increase by its introduction. I can now do refactorings in about 1% of the keystrokes that it would have taken me previously when we had no way for code to format itself.

Dusty Phillips, writer:

Black is opinionated so you don’t have to be.

Hynek Schlawack, creator of attrs, core developer of Twisted and CPython:

An auto-formatter that doesn’t suck is all I want for Xmas!

Carl Meyer, Django core developer:

At least the name is good.

Kenneth Reitz, creator of requests and pipenv:

This vastly improves the formatting of our code. Thanks a ton!

Show your style

Use the badge in your project’s README.md:

[![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)

Using the badge in README.rst:

.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
   :target: https://github.com/psf/black

Looks like this:

https://img.shields.io/badge/code%20style-black-000000.svg

Contents

User Guide

Development

Indices and tables