astral-sh/ruff 0.15.9

on GitHub

Release Notes

Released on 2026-04-02.

Preview features

• [pyflakes] Flag annotated variable redeclarations as F811 in preview mode (#24244)
• [ruff] Allow dunder-named assignments in non-strict mode for RUF067 (#24089)

Bug fixes

• [flake8-errmsg] Avoid shadowing existing msg in fix for EM101 (#24363)
• [flake8-simplify] Ignore pre-initialization references in SIM113 (#24235)
• [pycodestyle] Fix W391 fixes for consecutive empty notebook cells (#24236)
• [pyupgrade] Fix UP008 nested class matching (#24273)
• [pyupgrade] Ignore strings with string-only escapes (UP012) (#16058)
• [ruff] RUF072: skip formfeeds on dedent (#24308)
• [ruff] Avoid re-using symbol in RUF024 fix (#24316)
• [ruff] Parenthesize expression in RUF050 fix (#24234)
• Disallow starred expressions as values of starred expressions (#24280)

Rule changes

• [flake8-simplify] Suppress SIM105 for except* before Python 3.12 (#23869)
• [pyflakes] Extend F507 to flag %-format strings with zero placeholders (#24215)
• [pyupgrade] UP018 should detect more unnecessarily wrapped literals (UP018) (#24093)
• [pyupgrade] Fix UP008 callable scope handling to support lambdas (#24274)
• [ruff] RUF010: Mark fix as unsafe when it deletes a comment (#24270)

Formatter

• Add nested-string-quote-style formatting option (#24312)

Documentation

• [flake8-bugbear] Clarify RUF071 fix safety for non-path string comparisons (#24149)
• [flake8-type-checking] Clarify import cycle wording for TC001/TC002/TC003 (#24322)

Other changes

• Avoid rendering fix lines with trailing whitespace after | (#24343)

Contributors

• @charliermarsh
• @MichaReiser
• @tranhoangtu-it
• @dylwil3
• @zsol
• @renovate
• @bitloi
• @danparizher
• @chinar-amrutkar
• @second-ed
• @getehen
• @Redovo1
• @matthewlloyd
• @zanieb
• @InSyncWithFoo
• @RenzoMXD

Install ruff 0.15.9

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.9/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.9/ruff-installer.ps1 | iex"

Download ruff 0.15.9

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>