Python

Ruff Commands

Extremely fast Python linter and formatter written in Rust. Replaces Flake8, isort, and Black with 10-100x faster performance.

9 commands

Pro Tips

Use 'ruff check --fix' to automatically fix all safe issues.

Configure rules in pyproject.toml under [tool.ruff] section.

Use 'ruff check --watch' during development for instant feedback.

Common Mistakes

Use '--unsafe-fixes' carefully - these fixes may change code behavior.

Ruff format is opinionated like Black - configure minimal options only.

Commands

Check code

$ ruff check .

Lint all files in current directory.

Check and fix

$ ruff check . --fix

Lint and auto-fix all safe issues.

Fix with unsafe

$ ruff check . --fix --unsafe-fixes

Apply all fixes including potentially unsafe ones.

Format code

$ ruff format .

Format all files (like Black).

Check formatting

$ ruff format --check .

Check if files are formatted without changing.

Watch mode

$ ruff check . --watch

Re-lint on file changes.

Select rules

$ ruff check . --select E,F,W

Check only specific rule categories.

Ignore rules

$ ruff check . --ignore E501

Ignore specific rules during check.

Add noqa comments

$ ruff check . --add-noqa

Add suppression comments for all violations.