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ruff 0.17.0 - #316849
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ruff 0.17.0#316849
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p-linnane
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Oct 9, 2026
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Created by
brew bumpCreated with
brew bump-formula-pr.Details
release notes
Update the default and latest Python versions for 3.15 (#28792)
Ruff now defaults to Python 3.11 instead of 3.10 when no Python version is configured through
target-versionorrequires-python. When checking for syntax errors without a configured Python version, Ruff now defaults to Python 3.15 instead of 3.14.Update the default rule set (#28786)
Several of the
flake8-datetimezrules (DTZ001,DTZ005,DTZ006,DTZ007,DTZ011,DTZ012, andDTZ901) are no longer enabled by default, whileundefined-local-with-nested-import-star-usage(F406), which corresponds to a syntax error, is now enabled by default.Update Rust crate quick-junit to 0.8.0 (#27295)
JUnit output now uses a
skippedattribute instead ofdisabledon<testsuite>elements and includes askippedattribute on the root<testsuites>element.[
flake8-import-conventions] Adddatetime as dtas a conventional alias (ICN001) (#28790)Support Unicode dummy variable names (#28722)
The default
lint.dummy-variable-rgxnow recognizes underscore-prefixed Unicode names, such as_次, as dummy variables.Update to Unicode 17 (#21229, #28784)
Ruff now uses Unicode 17 data for identifier normalization and named character escapes (
"\N{...}").Always show unsafe and display-only fixes in the CLI (#27810)
The default
fulloutput format now shows unsafe fixes and suggestions requiring manual review, regardless of theunsafe-fixessetting. Actually applying unsafe fixes still requires explicit opt-in.Remove the Python dependency from conda-forge builds (conda-forge/ruff-feedstock#361)
The conda-forge build no longer depends on Python, now supports linux-riscv64, win-arm64, and linux-ppc64le platforms, and now includes shell completions. However, no longer depending on Python means that
python -m ruffandimport ruffwill no longer work. Useruffdirectly fromPATHinstead. PyPI installations and those from the standalone installer are unaffected.Remove support for ruff-lsp (#28750)
Support for
ruff-lsp, the legacy Python language server deprecated in Ruff v0.9.5, has been removed. The Ruff VS Code extension now always uses the native language server;ruff.nativeServeris deprecated and ignored. See the migration guide.Stabilization
The following rules have been stabilized and are no longer in preview:
lazy-import-mismatch(TID254)lazy-import-immediately-resolved(TID255)os-path-commonprefix(RUF071)The following behaviors have been stabilized:
unsorted-imports(I001),line-too-long(E501), anddoc-line-too-long(W505) now consistently ignore trailing pragma comments when computing line length. This resolved several bugs involving interactions between these rules (#27313) but may also cause existing imports to be reformatted and was thus classified as a breaking change.Preview features
flake8-bugbear] Report the method name and a more precise range (B005) (#27050)refurb] Mark fix unsafe and move tosuspicious(FURB152) (#28405)ruff] Allow docstrings in strict mode (RUF067) (#28679)Bug fixes
flake8-builtins] Expand checks in class scopes (A001) (#29076)flake8-self] Allow private access onobject.__new__(cls)instances (SLF001) (#29001)flake8-tidy-imports] Skiplazy-import-mismatchin stubs (TID254) (#29095)flake8-type-checking] Add the notion of runtime-ambiguous references (#26508)flake8-type-checking] Never flag annotations in function scopes (#29183)pyflakes] Mark the fix as unsafe when it creates a docstring (F541) (#28258)pylint] Preserve trailing comments inuseless-returnfix (PLR1711) (#29180)ruff] Avoid false positive whenpytest.raisesis used in awithstatement (RUF061) (#28186)Rule changes
pyupgrade] Suggesttyping.TypeFormon Python 3.15 (UP035) (#29084)Contributors
Install ruff 0.17.0
Install prebuilt binaries via shell script
Install prebuilt binaries via powershell script
powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.17.0/ruff-installer.ps1 | iex"Download ruff 0.17.0
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:
You can also download the attestation from GitHub and verify against that directly:
View the full release notes at https://github.com/astral-sh/ruff/releases/tag/0.17.0.