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Ruff is a linter for Python or Jupiter Notebooks.

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Files

Ruff will run on files with the following extensions:
  • .py
  • .ipynb (using nbqa)

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Configuration

Ruff supports the following config files:
  • pyproject.toml
  • ruff.toml
  • .ruff.toml
CodeRabbit will use the default settings based on the profile selected if no config file is found.

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When we skip Ruff

CodeRabbit will skip running Ruff when:
  • Ruff is already running in GitHub workflows.

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Ignored codes

The following Ruff codes are automatically ignored:
  • I001 - unsorted imports
  • F401 - unused imports
  • W291 - trailing whitespace
  • W293 - blank line contains whitespace
  • Q000 - bad quotes
  • ANN001 - missing type annotation
  • ANN201 - missing return type annotation
  • UP006 - deprecated type alias
  • UP045 - deprecated import
  • E501 - line too long
  • S101 - use of assert detected
  • EXE001 - Shebang is present but file is not executable

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Profile behavior

In Chill mode, Ruff uses a focused set of rule codes including Pyflakes (F), flake8-bugbear (B), flake8-bandit (S), and other essential checks. In Assertive mode, Ruff additionally enables:
  • ANN - flake8-annotations (type annotations)
  • ASYNC - flake8-async (async/await issues)
  • FBT - flake8-boolean-trap
  • C4 - flake8-comprehensions
  • DTZ - flake8-datetimez (timezone issues)
  • DJ - flake8-django
  • ISC - flake8-implicit-str-concat
  • LOG - flake8-logging
  • G - flake8-logging-format
  • PIE - flake8-pie
  • PT - flake8-pytest-style
  • FLY - flynt (f-string opportunities)
  • UP - pyupgrade (upgrade opportunities)
Additionally, in Assertive mode, S101 (use of assert) is ignored in test files.