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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.
[flake8-return] Add support for functions returning typing.Never (RET503) (#15298)
Server
Improve the observability by removing the need for the "trace" value to turn on or off logging. The server logging is solely controlled using the logLevel server setting
which defaults to info. This addresses the issue where users were notified about an error and told to consult the log, but it didn’t contain any messages. (#15232)
Ignore diagnostics from other sources for code action requests (#15373)
CLI
Improve the error message for --config key=value when the key is for a table and it’s a simple value
Bug fixes
[eradicate] Ignore metadata blocks directly followed by normal blocks (ERA001) (#15330)
[flake8-django] Recognize other magic methods (DJ012) (#15365)
[pycodestyle] Avoid false positives related to type aliases (E252) (#15356)
[pydocstyle] Avoid treating newline-separated sections as sub-sections (D405) (#15311)
[pyflakes] Remove call when removing final argument from format (F523) (#15309)
[refurb] Mark fix as unsafe when the right-hand side is a string (FURB171) (#15273)
[ruff] Treat ) as a regex metacharacter (RUF043, RUF055) (#15318)
[ruff] Parenthesize the int-call argument when removing the int call would change semantics (RUF046) (#15277)
Configuration
📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
If you want to rebase/retry this PR, check this box
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This PR contains the following updates:
0.8.6->0.9.0Release Notes
astral-sh/ruff (ruff)
v0.9.0Compare Source
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): Detectpytest.parametrizecalls outside decorators and calls with keyword arguments.module-import-not-at-top-of-file(E402): Ignorepytest.importorskipcalls between import statements.mutable-dataclass-default(RUF008) andfunction-call-in-dataclass-default-argument(RUF009): Add support forattrs.bad-version-info-comparison(PYI006): Extend the rule to check non-stub files.The following fixes or improvements to fixes have been stabilized:
redundant-numeric-union(PYI041)duplicate-union-members(PYI016)Formatter
This release introduces the new 2025 stable style (#13371), stabilizing the following changes:
ISC001incompatibility warning (#15123)assertmessage over breaking the assertion expression (#9457)ifguards inmatchcaseclauses (#13513)matchcasepatterns (#6933)ifkeyword for comprehensions where the condition has a leading comment (#12282)withstatements with a single context manager for Python 3.8 or older (#10276)max-doc-code-line-length = "dynamic"(#13523)Preview features
flake8-bugbear] Implementclass-as-data-structure(B903) (#9601)flake8-type-checking] Applyquoted-type-aliasmore eagerly inTYPE_CHECKINGblocks and ignore it in stubs (TC008) (#15180)pylint] Ignoreeq-without-hashin stub files (PLW1641) (#15310)pyupgrade] SplitUP007into two individual rules:UP007forUnionandUP045forOptional(UP007,UP045) (#15313)ruff] New rule that detects classes that are both an enum and adataclass(RUF049) (#15299)ruff] RecodeRUF025toRUF037(RUF037) (#15258)Rule changes
flake8-builtins] Ignorestdlib-module-shadowingin stub files(A005) (#15350)flake8-return] Add support for functions returningtyping.Never(RET503) (#15298)Server
logLevelserver settingwhich defaults to
info. This addresses the issue where users were notified about an error and told to consult the log, but it didn’t contain any messages. (#15232)CLI
--config key=valuewhen thekeyis for a table and it’s a simplevalueBug fixes
eradicate] Ignore metadata blocks directly followed by normal blocks (ERA001) (#15330)flake8-django] Recognize other magic methods (DJ012) (#15365)pycodestyle] Avoid false positives related to type aliases (E252) (#15356)pydocstyle] Avoid treating newline-separated sections as sub-sections (D405) (#15311)pyflakes] Remove call when removing final argument fromformat(F523) (#15309)refurb] Mark fix as unsafe when the right-hand side is a string (FURB171) (#15273)ruff] Treat)as a regex metacharacter (RUF043,RUF055) (#15318)ruff] Parenthesize theint-call argument when removing theintcall would change semantics (RUF046) (#15277)Configuration
📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).
🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.
♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.
🔕 Ignore: Close this PR and you won't be reminded about this update again.
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