Sourced from ruff's releases.

0.15.9

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

... (truncated)

Sourced from ruff's changelog.

0.15.9

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

... (truncated)

• 724ccc1 Bump 0.15.9 (#24369)
• 96d9e09 [ty] Move the deferred submodule inside infer/builder (#24368)
• 130da28 [ty] Infer the extra_items keyword argument to class-based TypedDicts as an...
• a617c54 [ty] Validate type qualifiers in functional TypedDict fields and the `extra_i...
• d851708 [ty] Improve robustness of various type-qualifier-related checks (#24251)
• aecb587 Only run the release-gate on workflow dispatch (#24366)
• b889571 [ty] Use infer_type_expression for parsing parameter annotations and return...
• 3286a62 Add a "release-gate" step to the release workflow (#24365)
• 5f88756 Disallow starred expressions as values of starred expressions (#24280)
• 5c59f8a [pyupgrade] Ignore strings with string-only escapes (UP012) (#16058)
• Additional commits viewable in compare view