ruff/crates/ruff_python_formatter
Micha Reiser 515de2d062
Move `Token`, `TokenKind` and `Tokens` to `ruff-python-ast` (#21760)
2025-12-02 20:10:46 +01:00
..
resources/test/fixtures Respect `fmt: skip` for compound statements on single line (#20633) 2025-11-18 12:02:09 -06:00
src Move `Token`, `TokenKind` and `Tokens` to `ruff-python-ast` (#21760) 2025-12-02 20:10:46 +01:00
tests Respect `fmt: skip` for compound statements on single line (#20633) 2025-11-18 12:02:09 -06:00
CONTRIBUTING.md Use `npm ci --ignore-scripts` everywhere (#21742) 2025-12-01 17:13:52 -05:00
Cargo.toml [`ruff`] Update schemars to v1 (#20942) 2025-10-20 08:59:52 +02:00
README.md Add f-string formatting to the docs (#15367) 2025-01-09 10:20:06 +01:00
generate.py Implement template strings (#17851) 2025-05-30 15:00:56 -05:00
orphan_rules_in_the_formatter.svg Generate FormatRule definitions (#4724) 2023-06-01 08:38:53 +02:00

README.md

Ruff Formatter

The Ruff formatter is an extremely fast Python code formatter that ships as part of the ruff CLI.

Goals

The formatter is designed to be a drop-in replacement for Black, but with an excessive focus on performance and direct integration with Ruff.

Specifically, the formatter is intended to emit near-identical output when run over Black-formatted code. When run over extensive Black-formatted projects like Django and Zulip, > 99.9% of lines are formatted identically. When migrating an existing project from Black to Ruff, you should expect to see a few differences on the margins, but the vast majority of your code should be unchanged.

If you identify deviations in your project, spot-check them against the intentional deviations enumerated below, as well as the unintentional deviations filed in the issue tracker. If you've identified a new deviation, please file an issue.

When run over non-Black-formatted code, the formatter makes some different decisions than Black, and so more deviations should be expected, especially around the treatment of end-of-line comments. For details, see Style Guide.

Getting started

Head to The Ruff Formatter for usage instructions and a comparison to Black.