Release Notes

Preview features

• [flake8-errmsg] Extend EM101 to support byte strings (#18867)
• [flake8-use-pathlib] Add autofix for PTH202 (#18763)
• [pygrep-hooks] Add AsyncMock methods to invalid-mock-access (PGH005) (#18547)
• [pylint] Ignore __init__.py files in (PLC0414) (#18400)
• [ruff] Trigger RUF037 for empty string and byte strings (#18862)
• [formatter] Fix missing blank lines before decorated classes in .pyi files (#18888)

Bug fixes

• Avoid generating diagnostics with per-file ignores (#18801)
• Handle parenthesized arguments in remove_argument (#18805)
• [flake8-logging] Avoid false positive for exc_info=True outside logger.exception (LOG014) (#18737)
• [flake8-pytest-style] Enforce pytest import for decorators (#18779)
• [flake8-pytest-style] Mark autofix for PT001 and PT023 as unsafe if there's comments in the decorator (#18792)
• [flake8-pytest-style] PT001/PT023 fix makes syntax error on parenthesized decorator (#18782)
• [flake8-raise] Make fix unsafe if it deletes comments (RSE102) (#18788)
• [flake8-simplify] Fix SIM911 autofix creating a syntax error (#18793)
• [flake8-simplify] Fix false negatives for shadowed bindings (SIM910, SIM911) (#18794)
• [flake8-simplify] Preserve original behavior for except () and bare except (SIM105) (#18213)
• [flake8-pyi] Fix PYI041's fix causing TypeError with None | None | ... (#18637)
• [perflint] Fix PERF101 autofix creating a syntax error and mark autofix as unsafe if there are comments in the list call expr (#18803)
• [perflint] Fix false negative in PERF401 (#18866)
• [pylint] Avoid flattening nested min/max when outer call has single argument (PLW3301) (#16885)
• [pylint] Fix PLC2801 autofix creating a syntax error (#18857)
• [pylint] Mark PLE0241 autofix as unsafe if there's comments in the base classes (#18832)
• [pylint] Suppress PLE2510/PLE2512/PLE2513/PLE2514/PLE2515 autofix if the text contains an odd number of backslashes (#18856)
• [refurb] Detect more exotic float literals in FURB164 (#18925)
• [refurb] Fix FURB163 autofix creating a syntax error for yield expressions (#18756)
• [refurb] Mark FURB129 autofix as unsafe if there's comments in the readlines call (#18858)
• [ruff] Fix false positives and negatives in RUF010 (#18690)
• Fix casing of analyze.direction variant names (#18892)

Rule changes

• Fix f-string interpolation escaping in generated fixes (#18882)
• [flake8-return] Mark RET501 fix unsafe if comments are inside (#18780)
• [flake8-async] Fix detection for large integer sleep durations in ASYNC116 rule (#18767)
• [flake8-async] Mark autofix for ASYNC115 as unsafe if the call expression contains comments (#18753)
• [flake8-bugbear] Mark autofix for B004 as unsafe if the hasattr call expr contains comments (#18755)
• [flake8-comprehension] Mark autofix for C420 as unsafe if there's comments inside the dict comprehension (#18768)
• [flake8-comprehensions] Handle template strings for comprehension fixes (#18710)
• [flake8-future-annotations] Add autofix (FA100) (#18903)
• [pyflakes] Mark F504/F522/F523 autofix as unsafe if there's a call with side effect (#18839)
• [pylint] Allow fix with comments and document performance implications (PLW3301) (#18936)
• [pylint] Detect more exotic NaN literals in PLW0177 (#18630)
• [pylint] Fix PLC1802 autofix creating a syntax error and mark autofix as unsafe if there's comments in the len call (#18836)
• [pyupgrade] Extend version detection to include sys.version_info.major (UP036) (#18633)
• [ruff] Add lint rule RUF064 for calling chmod with non-octal integers (#18541)
• [ruff] Added cls.__dict__.get('__annotations__') check (RUF063) (#18233)
• [ruff] Frozen dataclass default should be valid (RUF009) (#18735)

Server

• Consider virtual path for various server actions (#18910)

Documentation

• Add fix safety sections (#18940,#18841,#18802,#18837,#18800,#18415,#18853,#18842)
• Use updated pre-commit id (#18718)
• [perflint] Small docs improvement to PERF401 (#18786)
• [pyupgrade]: Use super(), not __super__ in error messages (UP008) (#18743)
• [flake8-pie] Small docs fix to PIE794 (#18829)
• [flake8-pyi] Correct collections-named-tuple example to use PascalCase assignment (#16884)
• [flake8-pie] Add note on type checking benefits to unnecessary-dict-kwargs (PIE804) (#18666)
• [pycodestyle] Clarify PEP 8 relationship to whitespace-around-operator rules (#18870)

Other changes

• Disallow newlines in format specifiers of single quoted f- or t-strings (#18708)
• [flake8-logging] Add fix safety section to LOG002 (#18840)
• [pyupgrade] Add fix safety section to UP010 (#18838)

Contributors

• @AlexWaygood
• @Andrej730
• @BurntSushi
• @GideonBear
• @InSyncWithFoo
• @JosiahKane
• @LaBatata101
• @LyricalToxic
• @MeGaGiGaGon
• @MichaReiser
• @RazerM
• @VascoSch92
• @alpaylan
• @carljm
• @charliermarsh
• @chirizxc
• @danparizher
• @dcreager
• @dericcrago
• @dhruvmanila
• @dylwil3
• @gopoto
• @hmvp
• @krikera
• @lubaskinc0de
• @mashehu
• @med1844
• @njhearp
• @ntBre
• @renovate
• @robsdedude
• @sharkdp
• @sobolevn
• @suneettipirneni
• @yunchipang
• @zanieb

Install ruff 0.12.1

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://github.com/astral-sh/ruff/releases/download/0.12.1/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://github.com/astral-sh/ruff/releases/download/0.12.1/ruff-installer.ps1 | iex"

Download ruff 0.12.1