ruff 0.12.0

[BrewTestBot]

Created by brew bump

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Created with brew bump-formula-pr.

release notes

## Release Notes
Check out the blog post for a migration guide and overview of the changes!
Breaking changes


Detection of more syntax errors
Ruff now detects version-related syntax errors, such as the use of the match

statement on Python versions before 3.10, and syntax errors emitted by

CPython's compiler, such as irrefutable match patterns before the final

case arm.


New default Python version handling for syntax errors
Ruff will default to the latest supported Python version (3.13) when

checking for the version-related syntax errors mentioned above to prevent

false positives in projects without a Python version configured. The default

in all other cases, like applying lint rules, is unchanged and remains at the

minimum supported Python version (3.9).


Updated f-string formatting
Ruff now formats multi-line f-strings with format specifiers to avoid adding a

line break after the format specifier. This addresses a change to the Python

grammar in version 3.13.4 that made such a line break a syntax error.


rust-toolchain.toml is no longer included in source distributions
The rust-toolchain.toml is used to specify a higher Rust version than Ruff's

minimum supported Rust version (MSRV) for development and building release

artifacts. However, when present in source distributions, it would also cause

downstream package maintainers to pull in the same Rust toolchain, even if

their available toolchain was MSRV-compatible.


Removed Rules
The following rules have been removed:

suspicious-xmle-tree-usage (S320)

Deprecated Rules
The following rules have been deprecated:

pandas-df-variable-name

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

for-loop-writes (FURB122)
check-and-remove-from-set (FURB132)
verbose-decimal-constructor (FURB157)
fromisoformat-replace-z (FURB162)
int-on-sliced-str (FURB166)
exc-info-outside-except-handler (LOG014)
import-outside-top-level (PLC0415)
unnecessary-dict-index-lookup (PLR1733)
nan-comparison (PLW0177)
eq-without-hash (PLW1641)
pytest-parameter-with-default-argument (PT028)
pytest-warns-too-broad (PT030)
pytest-warns-with-multiple-statements (PT031)
invalid-formatter-suppression-comment (RUF028)
dataclass-enum (RUF049)
class-with-mixed-type-vars (RUF053)
unnecessary-round (RUF057)
starmap-zip (RUF058)
non-pep604-annotation-optional (UP045)
non-pep695-generic-class (UP046)
non-pep695-generic-function (UP047)
private-type-parameter (UP049)

The following behaviors have been stabilized:

collection-literal-concatenation (RUF005) now recognizes slices, in

addition to list literals and variables.
The fix for readlines-in-for (FURB129) is now marked as always safe.
if-else-block-instead-of-if-exp (SIM108) will now further simplify

expressions to use or instead of an if expression, where possible.
unused-noqa (RUF100) now checks for file-level noqa comments as well

as inline comments.
subprocess-without-shell-equals-true (S603) now accepts literal strings,

as well as lists and tuples of literal strings, as trusted input.
boolean-type-hint-positional-argument (FBT001) now applies to types that

include bool, like bool | int or typing.Optional[bool], in addition to

plain bool annotations.
non-pep604-annotation-union (UP007) has now been split into two rules.

UP007 now applies only to typing.Union, while

non-pep604-annotation-optional (UP045) checks for use of

typing.Optional. UP045 has also been stabilized in this release, but you

may need to update existing include, ignore, or noqa settings to

accommodate this change.

Preview features

[ruff] Check for non-context-manager use of pytest.raises, pytest.warns, and pytest.deprecated_call (RUF061) (#17368)
[syntax-errors] Raise unsupported syntax error for template strings prior to Python 3.14 (#18664)

Bug fixes

Add syntax error when conversion flag does not immediately follow exclamation mark (#18706)
Add trailing space around readlines (#18542)
Fix \r and \r\n handling in t- and f-string debug texts (#18673)
Hug closing } when f-string expression has a format specifier (#18704)
[flake8-pyi] Avoid syntax error in the case of starred and keyword arguments (PYI059) (#18611)
[flake8-return] Fix RET504 autofix generating a syntax error (#18428)
[pep8-naming] Suppress fix for N804 and N805 if the recommended name is already used (#18472)
[pycodestyle] Avoid causing a syntax error in expressions spanning multiple lines (E731) (#18479)
[pyupgrade] Suppress UP008 if super is shadowed (#18688)
[refurb] Parenthesize lambda and ternary expressions (FURB122, FURB142) (#18592)
[ruff] Handle extra arguments to deque (RUF037) (#18614)
[ruff] Preserve parentheses around deque in fix for unnecessary-empty-iterable-within-deque-call (RUF037) (#18598)
[ruff] Validate arguments before offering a fix (RUF056) (#18631)
[ruff] Skip fix for RUF059 if dummy name is already bound (#18509)
[pylint] Fix PLW0128 to check assignment targets in square brackets and after asterisks (#18665)

Rule changes

Fix false positive on mutations in return statements (B909) (#18408)
Treat ty: comments as pragma comments (#18532)
[flake8-pyi] Apply custom-typevar-for-self to string annotations (PYI019) (#18311)
[pyupgrade] Don't offer a fix for Optional[None] (UP007, UP045) (#18545)
[pyupgrade] Fix super(__class__, self) detection (UP008) (#18478)
[refurb] Make the fix for FURB163 unsafe for log2, log10, *args, and deleted comments (#18645)

Server

Support cancellation requests (#18627)

Documentation

Drop confusing second * from glob pattern example for per-file-target-version (#18709)
Update Neovim configuration examples (#18491)
[pylint] De-emphasize __hash__ = Parent.__hash__ (PLW1641) (#18613)
[refurb] Add a note about float literal handling (FURB157) (#18615)

Contributors

@AlexWaygood
@BurntSushi
@DetachHead
@InSyncWithFoo
@K-dash
@LaBatata101
@MichaReiser
@RazerM
@abhijeetbodas2001
@benbaror
@carljm
@charliermarsh
@chirizxc
@close2code-palm
@dhruvmanila
@dylwil3
@felixscherz
@github-actions
@grievejia
@ibraheemdev
@mtshiba
@njhearp
@ntBre
@renovate
@robsdedude
@sharkdp
@shimies
@suneettipirneni
@thejchap
@twentyone212121

Install ruff 0.12.0
Install prebuilt binaries via shell script
curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/ruff/releases/download/0.12.0/ruff-installer.sh | sh
Install prebuilt binaries via powershell script
powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/ruff/releases/download/0.12.0/ruff-installer.ps1 | iex"
Download ruff 0.12.0



File
Platform
Checksum




ruff-aarch64-apple-darwin.tar.gz
Apple Silicon macOS
checksum


ruff-x86_64-apple-darwin.tar.gz
Intel macOS
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ruff-aarch64-pc-windows-msvc.zip
ARM64 Windows
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ruff-i686-pc-windows-msvc.zip
x86 Windows
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ruff-x86_64-pc-windows-msvc.zip
x64 Windows
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ruff-aarch64-unknown-linux-gnu.tar.gz
ARM64 Linux
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ruff-i686-unknown-linux-gnu.tar.gz
x86 Linux
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ruff-powerpc64-unknown-linux-gnu.tar.gz
PPC64 Linux
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ruff-powerpc64le-unknown-linux-gnu.tar.gz
PPC64LE Linux
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ruff-s390x-unknown-linux-gnu.tar.gz
S390x Linux
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ruff-x86_64-unknown-linux-gnu.tar.gz
x64 Linux
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ruff-armv7-unknown-linux-gnueabihf.tar.gz
ARMv7 Linux
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ruff-aarch64-unknown-linux-musl.tar.gz
ARM64 MUSL Linux
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ruff-i686-unknown-linux-musl.tar.gz
x86 MUSL Linux
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ruff-x86_64-unknown-linux-musl.tar.gz
x64 MUSL Linux
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ruff-arm-unknown-linux-musleabihf.tar.gz
ARMv6 MUSL Linux (Hardfloat)
checksum


ruff-armv7-unknown-linux-musleabihf.tar.gz
ARMv7 MUSL Linux
checksum

View the full release notes at https://github.com/astral-sh/ruff/releases/tag/0.12.0.

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