ruff 0.17.1

on Python PyPI

Release Notes

Released on 2026-10-15.

Preview features

• [pycodestyle] Don't treat None, True, or False as keywords (E271-E274) (#29322)

Bug fixes

• Fix dedent with multiple leading comments (#29382)
• [flake8-pyi] Detect legacy positional-only parameters in __new__ methods (PYI063) (#28502)
• [flake8-pyi] Fix false positives on quoted annotations (PYI036) (#29274)
• [perflint] Avoid invalid comprehension suggestions (PERF401, PERF403) (#29366)

Rule changes

• Treat more collections and weakref containers as mutable (#29213)

Documentation

• [flake8-import-conventions] Update default and example aliases (#29333)

Contributors

• @fixfon
• @mmaxjr
• @joshuavetos
• @nekomario28
• @ntBre
• @shan3520

Install ruff 0.17.1

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.17.1/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.17.1/ruff-installer.ps1 | iex"

Download ruff 0.17.1

Verifying GitHub Artifact Attestations

The artifacts in this release have attestations generated with GitHub Artifact Attestations. These can be verified by using the GitHub CLI:

gh attestation verify <file-path of downloaded artifact> --repo astral-sh/ruff

You can also download the attestation from GitHub and verify against that directly:

gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>