Sourced from ruff's releases.

0.9.1

Release Notes

Preview features

• [pycodestyle] Run too-many-newlines-at-end-of-file on each cell in notebooks (W391) (#15308)
• [ruff] Omit diagnostic for shadowed private function parameters in used-dummy-variable (RUF052) (#15376)

Rule changes

• [flake8-bugbear] Improve assert-raises-exception message (B017) (#15389)

Formatter

• Preserve trailing end-of line comments for the last string literal in implicitly concatenated strings (#15378)

Server

• Fix a bug where the server and client notebooks were out of sync after reordering cells (#15398)

Bug fixes

• [flake8-pie] Correctly remove wrapping parentheses (PIE800) (#15394)
• [pyupgrade] Handle comments and multiline expressions correctly (UP037) (#15337)

Contributors

• @​AntoineD
• @​InSyncWithFoo
• @​MichaReiser
• @​calumy
• @​dcreager
• @​dhruvmanila
• @​dylwil3
• @​sharkdp
• @​tjkuson

Install ruff 0.9.1

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/ruff/releases/download/0.9.1/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy ByPass -c "irm https://github.com/astral-sh/ruff/releases/download/0.9.1/ruff-installer.ps1 | iex"

... (truncated)

Sourced from ruff's changelog.

0.9.1

Preview features

• [pycodestyle] Run too-many-newlines-at-end-of-file on each cell in notebooks (W391) (#15308)
• [ruff] Omit diagnostic for shadowed private function parameters in used-dummy-variable (RUF052) (#15376)

Rule changes

• [flake8-bugbear] Improve assert-raises-exception message (B017) (#15389)

Formatter

• Preserve trailing end-of line comments for the last string literal in implicitly concatenated strings (#15378)

Server

• Fix a bug where the server and client notebooks were out of sync after reordering cells (#15398)

Bug fixes

• [flake8-pie] Correctly remove wrapping parentheses (PIE800) (#15394)
• [pyupgrade] Handle comments and multiline expressions correctly (UP037) (#15337)

0.9.0

Check out the blog post for a migration guide and overview of the changes!

Breaking changes

Ruff now formats your code according to the 2025 style guide. As a result, your code might now get formatted differently. See the formatter section for a detailed list of changes.

This release doesn’t remove or remap any existing stable rules.

Stabilization

The following rules have been stabilized and are no longer in preview:

• stdlib-module-shadowing (A005). This rule has also been renamed: previously, it was called builtin-module-shadowing.
• builtin-lambda-argument-shadowing (A006)
• slice-to-remove-prefix-or-suffix (FURB188)
• boolean-chained-comparison (PLR1716)
• decimal-from-float-literal (RUF032)
• post-init-default (RUF033)
• useless-if-else (RUF034)

The following behaviors have been stabilized:

• pytest-parametrize-names-wrong-type (PT006): Detect pytest.parametrize calls outside decorators and calls with keyword arguments.

... (truncated)

• 12f86f3 Ruff 0.9.1 (#15407)
• 2b28d56 Associate a trailing end-of-line comment in a parenthesized implicit concaten...
• adca7bd Remove pygments pin (#15404)
• 6b98a26 [red-knot] Support assert_type (#15194)
• c874638 [red-knot] Move tuple-containing-Never tests to Markdown (#15402)
• c364b58 [flake8-pie] Correctly remove wrapping parentheses (PIE800) (#15394)
• 73d424e Fix outdated doc for handling the default file types with the pre-commit hook...
• 6e9ff44 Insert the cells from the start position (#15398)
• f2c3ddc [red-knot] Move intersection type tests to Markdown (#15396)
• b861551 Remove unnecessary backticks (#15393)
• Additional commits viewable in compare view

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