ruff 0.15.18

on Python PyPI

Release Notes

Released on 2026-06-18.

Preview features

• Handle nested ruff:ignore comments (#25791)
• Stop displaying severity in output (#26050)
• Use human-readable names in CLI output (#25937)
• Use human-readable names in LSP and playground diagnostics (#26058)
• [pydocstyle] Prevent property docstrings starting with verbs (D421) (#23775)
• [flake8-pyi] Extend PYI033 to Python files (#26129)

Bug fixes

• Detect equivalent numeric mapping keys (#26009)
• Detect mapping keys equivalent to booleans (#25982)
• Detect repeated signed and complex dictionary keys (#26007)

Rule changes

• [flake8-pyi] Rename PYI033 to legacy-type-comment (#26131)

Performance

• Use ThinVec for call keywords (#25999)
• Inline parser recovery context checks (#26038)
• Match parser keywords as bytes (#26037)
• Move value parsing out of lexing (#25360)

Server

• Render subdiagnostics and secondary annotations as related information (#26011)

Documentation

• Update fix availability for always-fixable rules (#26091)
• [flake8-tidy-imports] Add fix safety section (TID252) (#17491)

Parser

• Reject __debug__ lambda parameters (#26022)
• Reject _ as a match-pattern target (#25977)
• Reject multiple starred names in sequence patterns (#25976)
• Reject parenthesized star imports (#26021)
• Reject starred comprehension targets (#26023)
• Reject unparenthesized generator expressions in class bases (#25978)
• Reject yield expressions after commas (#26024)
• Validate function type parameter default order (#25981)

Playground

• Make diagnostic links clickable (#26104)
• Use diagnostic tags (#26105)

Contributors

• @AlexWaygood
• @ntBre
• @gtkacz
• @MichaReiser
• @charliermarsh
• @Kalmaegi

Install ruff 0.15.18

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.18/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.18/ruff-installer.ps1 | iex"

Download ruff 0.15.18

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>