Update dependency ruff to v0.16.0

[renovate]

ℹ️ Note

This PR body was truncated due to platform limits.

This PR contains the following updates:

Package	Change	Age	Confidence
ruff (source, changelog)	0.14.14 → 0.16.0

---

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Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

---

Release Notes

astral-sh/ruff (ruff)

v0.16.0

Compare Source

Released on 2026-07-23.

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

Breaking changes

• Ruff now enables a much larger set of rules by default (413, up from 59). See the blog post for
  more details and the new Default Rules page for a
  full listing of the enabled rules.

• Ruff can now format Python code blocks in Markdown files and will do this by default. See the
  documentation for more details.

• Ruff now supports ruff: ignore comments at the ends of lines, like noqa comments, or on the line preceding a diagnostic. For example, these both suppress an unused-import (F401) diagnostic:

  import math  # ruff: ignore[F401]
  
  # ruff: ignore[F401]
  import os

• Fixes are now shown in check and format --check output:

  ❯ ruff format --check .
  unformatted: File would be reformatted
   --> try.md:1:1
    |
  1 | ```python
    - import   math
  2 + import math
  3 | ```
    |
  
  1 file would be reformatted

  This example also shows off the Markdown formatting.

• format --check now supports the same output formats as the linter, including the github and
  gitlab outputs for rendering annotations in CI:

  ❯ ruff format --check --output-format github .
  ::error title=ruff (unformatted),file=try.md,line=2,col=8,endLine=2,endColumn=10::try.md:2:8: unformatted: File would be reformatted

  See the CLI help or documentation for the
  full list of supported formats.

• The filename, location, end_location, fix.edits[].location, and fix.edits[].end_location
  fields in the JSON output format may now be null rather than defaulting to the empty string and
  row 1, column 1, respectively.

Stabilization

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

• airflow3-incompatible-function-signature
  (AIR303)
• missing-copyright-notice
  (CPY001)
• unnecessary-from-float (FURB164)
• sorted-min-max (FURB192)
• implicit-string-concatenation-in-collection-literal
  (ISC004)
• log-exception-outside-except-handler
  (LOG004)
• invalid-bool-return-type
  (PLE0304)
• too-many-positional-arguments
  (PLR0917)
• stop-iteration-return (PLR1708)
• none-not-at-end-of-union
  (RUF036)
• access-annotations-from-class-dict
  (RUF063)
• duplicate-entry-in-dunder-all
  (RUF068)

The following behaviors have been stabilized:

• blind-except (BLE001) is now suppressed when
  the exception is logged via logging methods other than critical, error and exception.
• future-required-type-annotation
  (FA102) now checks for additional PEP 585-compatible
  APIs, such as those from collections.abc.
• f-string-in-get-text-func-call
  (INT001),
  format-in-get-text-func-call
  (INT002), and
  printf-in-get-text-func-call
  (INT003) now check for additional common ways of using the gettext module, such as assigning
  it to builtins._.
• suspicious-url-open-usage
  (S310) now resolves local string literal bindings to avoid more false positives.
• snmp-insecure-version (S508) and
  snmp-weak-cryptography (S509) now
  support the recommended API from newer versions of PySNMP.
• typing-text-str-alias (UP019) now
  recognizes typing_extensions.Text in addition to typing.Text.

Preview features

• [pyupgrade] Fix false positive with TypeVar default before Python 3.13 (UP040) (#​26888)

Bug fixes

• [ruff] Fix missing check on unrecognized early bound (RUF016) (#​26986)

Rule changes

• Insert a space after the colon in Ruff suppression comments (#​27123)

Performance

• [pyupgrade] Speed up unnecessary-future-import (UP010) (#​27047)

Documentation

• [ruff] Add missing period in "Why is this bad?" section (RUF200) (#​26930)
• [flake8-simplify] Clarify os.environ behavior on Windows (SIM112) (#​26972)
• [pydocstyle] Document fix safety (D400) (#​26971)

Contributors

• @​jonathandung
• @​Joosboy
• @​MichaReiser
• @​Andrej730
• @​ntBre
• @​zaniebot

v0.15.22

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Release Notes

Released on 2026-07-16.

Preview features

• [pycodestyle] Add an autofix for E402 (#​22212)
• [refurb] Allow subclassing builtins in stub files (FURB189) (#​26812)
• [ruff] Add rule to replace noqa comments with ruff:ignore (RUF105) (#​26423)
• [ruff] Add rule to use human-readable names in ruff:ignore comments (RUF106) (#​26682)
• [ruff] Add rule to use human-readable names in configuration selectors (RUF201) (#​26772)

Bug fixes

• [flake8-pyi] Fix false positive in __all__ (PYI053) (#​26872)

Rule changes

• [pylint] Ignore mutable type updates in redefined-loop-name (PLW2901) (#​25733)

Performance

• Avoid redundant lexer token bookkeeping (#​26765)
• Avoid redundant pending-indentation writes (#​26774)
• Avoid unnecessary identifier lookahead (#​26525)
• Reuse parser scratch buffers (#​26798)

Documentation

• Document argfile support (#​26803)
• [flake8-datetimez] Clarify naming guidance for datetime.today (DTZ002) (#​26658)
• [pycodestyle] Document E731 fix safety (#​26847)
• [ruff] Clarify intentional async contexts for unused-async (RUF029) (#​26641)

Contributors

• @​dwego
• @​MichaReiser
• @​Joosboy
• @​KaufmanDmitriy
• @​PeterJCLaw
• @​ntBre
• @​charliermarsh

Install ruff 0.15.22

Install prebuilt binaries via shell script

curl --proto '=https' --tlsv1.2 -LsSf https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-installer.sh | sh

Install prebuilt binaries via powershell script

powershell -ExecutionPolicy Bypass -c "irm https://releases.astral.sh/github/ruff/releases/download/0.15.22/ruff-installer.ps1 | iex"

Download ruff 0.15.22

File	Platform	Checksum
ruff-aarch64-apple-darwin.tar.gz	Apple Silicon macOS	checksum
ruff-x86_64-apple-darwin.tar.gz	Intel macOS	checksum
ruff-aarch64-pc-windows-msvc.zip	ARM64 Windows	checksum
ruff-i686-pc-windows-msvc.zip	x86 Windows	checksum
ruff-x86_64-pc-windows-msvc.zip	x64 Windows	checksum
ruff-aarch64-unknown-linux-gnu.tar.gz	ARM64 Linux	checksum
ruff-i686-unknown-linux-gnu.tar.gz	x86 Linux	checksum
ruff-powerpc64-unknown-linux-gnu.tar.gz	PPC64 Linux	checksum
ruff-powerpc64le-unknown-linux-gnu.tar.gz	PPC64LE Linux	checksum
ruff-riscv64gc-unknown-linux-gnu.tar.gz	RISCV Linux	checksum
ruff-s390x-unknown-linux-gnu.tar.gz	S390x Linux	checksum
ruff-x86_64-unknown-linux-gnu.tar.gz	x64 Linux	checksum
ruff-armv7-unknown-linux-gnueabihf.tar.gz	ARMv7 Linux	checksum
ruff-aarch64-unknown-linux-musl.tar.gz	ARM64 MUSL Linux	checksum
ruff-i686-unknown-linux-musl.tar.gz	x86 MUSL Linux	checksum
ruff-x86_64-unknown-linux-musl.tar.gz	x64 MUSL Linux	checksum
ruff-arm-unknown-linux-musleabihf.tar.gz	ARMv6 MUSL Linux (Hardfloat)	checksum
ruff-armv7-unknown-linux-musleabihf.tar.gz	ARMv7 MUSL Linux	checksum

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:

gh attestation verify <file-path of downloaded artifact> --repo astral-sh/ruff

You can also download the attestation from GitHub and verify against that directly:

gh attestation verify <file-path of downloaded artifact> --bundle <file-path of downloaded attestation>

v0.15.21

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Released on 2026-07-09.

Preview features

• Add --add-ignore for adding ruff:ignore comments (#​26346)
• [flake8-comprehensions] Drop C409 tuple comprehension preview behavior (#​25707)
• Avoid whitespace normalization when formatting comments (#​26455)
• [pyupgrade] Lint and fix use of deprecated abc decorators (UP051) (#​26417)

Bug fixes

• Refine non-empty f-string detection (#​26526)
• Detect syntax errors in individual notebook cells (#​26419)
• [flake8-implicit-str-concat] Fix ISC003 autofix incorrectly stripping + from comments (#​26554)

Rule changes

• [flake8-executable] Mark EXE004 fix as unsafe (#​26033)
• [flake8-pyi] Mark PYI061 fixes as unsafe in Python files (#​26533)
• [pydocstyle] Skip overload-with-docstring in stub files (D418) (#​26318)

Performance

• Avoid per-token source index visitor calls (#​26506)
• Cache parenthesized expression boundaries in the formatter (#​26344)
• Improve performance of rendering edits in preview mode (#​26565)
• Inline fits_element in formatter (#​26429)
• Inline formatter printing hot paths (#​26504)
• Lazily create builtin bindings (#​26510)
• Skip empty trivia scans in the source indexer (#​26507)
• Use ICF for macOS release builds (#​25780)

Formatter

• Add --extend-exclude to ruff format (#​26372)

Documentation

• Add "How does Ruff's import sorting compare to isort?" link to README (#​26530)
• Fix Mozilla Firefox repository link in README (#​26537)
• [flake8-bandit] Fix misleading docstring for mako-templates (S702) (#​26432)
• [ruff] Fix non-triggering example for if-key-in-dict-del (RUF051) (#​26433)

Contributors

• @​EkriirkE
• @​tingerrr
• @​s-rigaud
• @​nikolauspschuetz
• @​Avasam
• @​ntBre
• @​omar-y-abdi
• @​AlexWaygood
• @​sylvestre
• @​shaanmajid
• @​lerebear
• @​baltasarblanco
• @​Sanjays2402
• @​ZedThree
• @​servusdei2018
• @​charliermarsh
• @​jesco-absolute
• @​velikodniy
• @​zaniebot
• @​epage

v0.15.20

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Released on 2026-06-25.

Preview features

• Allow human-readable names in rule selectors (#​25887)
• Emit a warning instead of an error for unknown rule selectors (#​26113)
• Match noqa shebang handling in ruff:ignore comments (#​26286)
• [ruff] Remove pytest-fixture-autouse (RUF076) (#​26240, #​26371)

Documentation

• Add versioning sections to custom crate READMEs (#​26317)
• Update ruff_python_parser README for crates.io (#​26315)
• [perflint] Clarify that PERF402 applies to any iterable (#​26242)

Contributors

• @​dhruvmanila
• @​MichaReiser
• @​ntBre
• @​trilamsr

v0.15.19

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Released on 2026-06-23.

Preview features

• Support human-readable names when hovering suppression comments and in code actions (#​26114)

Bug fixes

• Fall back to default settings when editor-only settings are invalid (#​26244)
• Fix panic when inserting text at a notebook cell boundary (#​26111)

Rule changes

• [pylint] Update fix suggestions for __floor__, __trunc__, __length_hint__, and __matmul__ variants (PLC2801) (#​26239)

Performance

• Avoid allocating when parsing single string literals (#​26200)
• Avoid reallocating singleton call arguments (#​26223)
• Lazily create source files for lint diagnostics (#​26226)
• Optimize formatter text width and indentation (#​26236)
• Reserve capacity for builtin bindings (#​26229)
• Skip repeated-key checks for singleton dictionaries (#​26228)
• Use ArrayVec for qualified name segments (#​26224)

Documentation

• [flake8-pyi] Note that PYI051 is an opinionated stylistic rule (#​26179)
• [pyupgrade] Clarify UP029 as a Python 2 compatibility rule (#​26243)

Other changes

• Publish Ruff crates to crates.io (#​26271)

Contributors

• @​MakenRosa
• @​MichaReiser
• @​trilamsr
• @​ntBre
• @​sanjibani
• @​charliermarsh

v0.15.18

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Released on 2026-06-18.

Preview features

• Handle nested ruff:ignore comments (#​25791)
• Stop displaying severity in output (#​26050)
• Use human-readable names in CLI output (#​25937)
• Use human-readable names in LSP and playground diagnostics (#​26058)
• [pydocstyle] Prevent property docstrings starting with verbs (D421) (#​23775)
• [flake8-pyi] Extend PYI033 to Python files (#​26129)

Bug fixes

• Detect equivalent numeric mapping keys (#​26009)
• Detect mapping keys equivalent to booleans (#​25982)
• Detect repeated signed and complex dictionary keys (#​26007)

Rule changes

• [flake8-pyi] Rename PYI033 to legacy-type-comment (#​26131)

Performance

• Use ThinVec for call keywords (#​25999)
• Inline parser recovery context checks (#​26038)
• Match parser keywords as bytes (#​26037)
• Move value parsing out of lexing (#​25360)

Server

• Render subdiagnostics and secondary annotations as related information (#​26011)

Documentation

• Update fix availability for always-fixable rules (#​26091)
• [flake8-tidy-imports] Add fix safety section (TID252) (#​17491)

Parser

• Reject __debug__ lambda parameters (#​26022)
• Reject _ as a match-pattern target (#​25977)
• Reject multiple starred names in sequence patterns (#​25976)
• Reject parenthesized star imports (#​26021)
• Reject starred comprehension targets (#​26023)
• Reject unparenthesized generator expressions in class bases (#​25978)
• Reject yield expressions after commas (#​26024)
• Validate function type parameter default order (#​25981)

Playground

• Make diagnostic links clickable (#​26104)
• Use diagnostic tags (#​26105)

Contributors

• @​AlexWaygood
• @​ntBre
• @​gtkacz
• @​MichaReiser
• @​charliermarsh
• @​Kalmaegi

v0.15.17

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Released on 2026-06-11.

Preview features

• Allow human-readable names in suppression comments (#​25614)
• Fix handling of ignore comments within a disable/enable pair (#​25845)
• Prioritize human-readable names in CLI output (#​25869)
• Respect diagnostic start and parent ranges and trailing comments in ruff:ignore suppressions (#​25673)
• [flake8-async] Add trio.as_safe_channel to safe decorators (ASYNC119) (#​25775)
• [flake8-pytest-style] Also check pytest_asyncio fixtures (#​25375)
• [ruff] Ban pytest autouse fixtures (RUF076) (#​25477)
• [pyupgrade] Add from __future__ import annotations automatically (UP007, UP045) (#​23259)

Bug fixes

• Fix diagnostic when ruff:enable or ruff:disable appears where ruff:ignore is expected (#​25700)
• [pyupgrade] Preserve leading empty literals to avoid syntax errors (UP032) (#​25491)

Rule changes

• [flake8-pytest-style] Clarify diagnostic message for single parameters (PT007) (#​25592)
• [numpy] Drop autofix for np.in1d (NPY201) (#​25612)
• [pylint] Exempt Python version comparisons (PLR2004) (#​25743)

Performance

• Reserve AST Vecs with correct capacity for common cases (#​25451)

Formatter

• Preserve whitespace for Quarto cell option comments (#​25641)

CLI

• Allow rule names in ruff rule (#​25640)

Other changes

• Fix playground diagnostics scrollbars (#​25642)

Contributors

• @​SuryanshSS1011
• @​anishgirianish
• @​romero-deshaw
• @​karlhillx
• @​carljm
• @​ntBre
• @​11happy
• @​Kilo59
• @​oconnor663
• @​LeonidasZhak
• @​DavisVaughan
• @​MeGaGiGaGon
• @​jonathandung
• @​MichaReiser
• @​brianmego

v0.15.16

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Released on 2026-06-04.

Preview features

• [flake8-async] Implement yield-in-context-manager-in-async-generator (ASYNC119) (#​24644)
• [pylint] Narrow diagnostic range and exclude cases without exception handlers (PLW0717) (#​25440)
• [ruff] Treat yield before break from a terminal loop as terminal (RUF075) (#​25447)

Bug fixes

• [eradicate] Avoid flagging ruff:ignore comments as code (ERA001) (#​25537)
• [eradicate] Fix ERA001/RUF100 conflict when noqa is on commented-out code (#​25414)
• [pyflakes] Avoid removing the format call when it would change behavior (F523) (#​25320)
• [pylint] Avoid syntax errors in invalid character replacements in f-strings before Python 3.12 (PLE2510, PLE2512, PLE2513, PLE2514, PLE2515) (#​25544)
• [pyupgrade] Avoid converting format calls with more kinds of side effects (UP032) (#​25484)

Rule changes

• [flake8-pytest-style] Avoid fixes for ambiguous argnames and argvalues combinations (PT006) (#​24776)

Performance

• Drop excess capacity from statement suites during parsing (#​25368)

Documentation

• [pydocstyle] Improve discoverability of rules enabled for each convention (#​24973)
• [ruff] Restore example code for Python versions before 3.15 (RUF017) (#​25439)
• Fix typo bin/active → bin/activate in tutorial (#​25473)

Other changes

• Shrink additional parser AST collections (#​25465)

Contributors

• @​Redslayer112
• @​koriyoshi2041
• @​George-Ogden
• @​TejasAmle
• @​anishgirianish
• @​ntBre
• @​MichaReiser
• @​loganrosen
• @​RafaelJohn9
• @​adityasingh2400

v0.15.15

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Released on 2026-05-28.

Preview features

• Fix Markdown closing fence handling (#​25310)
• [pyflakes] Report duplicate imports in typing.TYPE_CHECKING block (F811) (#​22560)

Bug fixes

• [pyflakes] Treat function-scope bare annotations as locals per PEP 526 (F821) (#​21540)

Performance

• Avoid redundant TokenValue drops in the lexer (#​25300)
• Reduce memory usage by dropping token-excess capacity and improve performance by approximating the initial tokens Vec size (#​25354)
• Use ThinVec in AST to shrink Stmt (#​25361)

Documentation

• Fix line-length example for --config option (#​25389)
• [flake8-comprehensions] Document RecursionError edge case in __len__ (C416) (#​25286)
• [mccabe] Improve example (C901) (#​25287)
• [pyupgrade] Clarify fix safety docs (UP007, UP045) (#​25288)
• [refurb] Document FURB192 exception change for empty sequences (#​25317)
• [ruff] Document false negative for user-defined types (RUF013) (#​25289)

Formatter

• Fix formatting of lambdas nested within f-strings (#​25398)

Server

• Return code action for codeAction/resolve requests that contain no or no valid URL (#​25365)

Other changes

• Expand semantic syntax errors for invalid walruses (#​25415)

Contributors

• @​chirizxc
• @​ntBre
• @​adityasingh2400
• @​charliermarsh
• @​fallintoplace
• @​martin-schlossarek
• @​MichaReiser
• @​Ruchir28

v0.15.14

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Released on 2026-05-21.

Preview features

• [airflow] Implement airflow-task-implicit-multiple-outputs (AIR202) (#​25152)
• [flake8-use-pathlib] Mark PTH101 fix as unsafe when first argument is a class attribute annotated as int (#​25086)
• [pylint] Implement too-many-try-statements (W0717) (#​23970)
• [ruff] Add incorrect-decorator-order (RUF074) (#​23461)
• [ruff] Add fallible-context-manager (RUF075) (#​22844)

Bug fixes

• Fix lambda formatting in interpolated string expressions (#​25144)
• Treat generic frozenset annotations as immutable (#​25251)
• [flake8-type-checking] Avoid strict behavior when future-annotations are enabled (TC001, TC002, TC003) (#​25035)
• [pylint] Avoid false positives in else clause (PLR1733) (#​25177)

Rule changes

• [flake8-comprehensions] Skip C417 for lambdas with positional-only parameters (#​25272)
• [flake8-simplify] Preserve f-string source verbatim in SIM101 fix (#​25061)

Performance

• Avoid unnecessary parser lookahead for operators (#​25290)

Documentation

• Update code example setting Neovim LSP log level (#​25284)

Other changes

• Add full PEP 798 support (#​25104)
• Add a parser recursion limit (#​24810)
• Update various ruff_python_stdlib APIs (#​25273)

Contributors

• @​ocaballeror
• @​lerebear
• @​samuelcolvin
• @​baltasarblanco
• @​aconal-com
• @​anishgirianish
• @​JelleZijlstra
• @​AlexWaygood
• @​ntBre
• @​adityasingh2400
• @​charliermarsh
• @​Dev-iL
• @​neutrinoceros
• @​shivamtiwari3
• @​Dev-X25874

v0.15.13

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Released on 2026-05-14.

Preview features

• Add a rule to flag lazy imports that are eagerly evaluated (#​25016)
• [pylint] Standardize diagnostic message (PLR0914, PLR0917) (#​24996)

Bug fixes

• Fix F811 false positive for class methods (#​24933)
• Fix setting selection for multi-folder workspace (#​24819)
• [eradicate] Fix false positive for lines with leading whitespace (ERA001) (#​25122)
• [flake8-pyi] Fix false positive for f-string debug specifier (PYI016) (#​24098)

Rule changes

• Always include panic payload in panic diagnostic message (#​24873)
• Restrict PYI034 for in-place operations to enclosing class (#​24511)
• Improve error message for parameters that are declared global (#​24902)
• Update known stdlib (#​25103)

Performance

• [isort] Avoid constructing glob::Patterns for literal known modules (#​25123)

CLI

• Add TOML examples to --config help text (#​25013)
• Colorize ruff check 'All checks passed' (#​25085)

Configuration

• Increase max allowed value of line-length setting (#​24962)

Documentation

• Add D203 to rules that conflict with the formatter (#​25044)
• Clarify COM819 and formatter interaction (#​25045)
• Clarify that NotImplemented is a value, not an exception (F901) (#​25054)
• Update number of lint rules supported (#​24942)

Other changes

• Simplify the playground's markdown template (#​24924)

Contributors

• @​MichaReiser
• @​brian-c11
• @​Andrej730
• @​denyszhak
• @​darestack
• @​sharkdp
• @​charliermarsh
• @​EkriirkE
• @​eyupcanakman
• @​Hrk84ya
• @​thernstig
• @​ntBre

v0.15.12

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Released on 2026-04-24.

Preview features

• Implement #ruff:file-ignore file-level suppressions (#​23599)
• Implement #ruff:ignore logical-line suppressions (#​23404)
• Revert preview changes to displayed diagnostic severity in LSP (#​24789)
• [airflow] Implement task-branch-as-short-circuit (AIR004) (#​23579)
• [flake8-bugbear] Fix break/continue handling in loop-iterator-mutation (B909) (#​24440)
• [pylint] Fix PLC2701 for type parameter scopes (#​24576)

Rule changes

• [pandas-vet] Suggest .array as well in PD011 (#​24805)

CLI

• Respect default Unix permissions for cache files (#​24794)

Documentation

• [pylint] Fix PLR0124 description not to claim self-comparison always returns the same value (#​24749)
• [pyupgrade] Expand docs on reusable TypeVars and scoping (UP046) (#​24153)
• Improve rules table accessibility (#​24711)

Contributors

• @​dylwil3
• @​AlexWaygood
• @​woodruffw
• @​avasis-ai
• @​Dev-iL
• @​denyszhak
• @​ShipItAndPray
• @​anishgirianish
• @​augustelalande
• @​amyreese
• @​majiayu000

v0.15.11

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Released on 2026-04-16.

Preview features

• [ruff] Ignore RUF029 when function is decorated with asynccontextmanager (#​24642)
• [airflow] Implement airflow-xcom-pull-in-template-string (AIR201) (#​23583)
• [flake8-bandit] Fix S103 false positives and negatives in mask analysis (#​24424)

Bug fixes

• [flake8-async] Omit overridden methods for ASYNC109 (#​24648)

Documentation

• [flake8-async] Add override mention to ASYNC109 docs (#​24666)
• Update Neovim config examples to use vim.lsp.config (#​24577)

Contributors

• @​augustelalande
• @​anishgirianish
• @​benberryallwood
• @​charliermarsh
• @​Dev-iL

v0.15.10

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Released on 2026-04-09.

Preview features

• [flake8-logging] Allow closures in except handlers (LOG004) (#​24464)
• [flake8-self] Make SLF diagnostics robust to non-self-named variables (#​24281)
• [flake8-simplify] Make the fix for collapsible-if safe in preview (SIM102) (#​24371)

Bug fixes

• Avoid emitting multi-line f-string elements before Python 3.12 (#​24377)
• Avoid syntax error from E502 fixes in f-strings and t-strings (#​24410)
• Strip form feeds from indent passed to dedent_to (#​24381)
• [pyupgrade] Fix panic caused by handling of octals (UP012) (#​24390)
• Reject multi-line f-string elements before Python 3.12 (#​24355)

Rule changes

• [ruff] Treat f-string interpolation as potential side effect (RUF019) (#​24426)

Server

• Add support for custom file extensions (#​24463)

Documentation

• Document adding fixes in CONTRIBUTING.md (#​24393)
• Fix JSON typo in settings example (#​24517)

Contributors

• @​charliermarsh
• @​dylwil3
• @​silverstein
• @​anishgirianish
• @​shizukushq
• @​zanieb
• @​AlexWaygood

v0.15.9

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Released on 2026-04-02.

Preview features

• [pyflakes] Flag annotated variable redeclarations as F811 in preview mode (#​24244)
• [ruff] Allow dunder-named assignments in non-strict mode for RUF067 (#​24089)

Bug fixes

• [flake8-errmsg] Avoid shadowing existing msg in fix for EM101 (#​24363)
• [flake8-simplify] Ignore pre-initialization references in SIM113 (#​24235)
• [pycodestyle] Fix W391 fixes for consecutive empty notebook cells (#​24236)
• [pyupgrade] Fix UP008 nested class matching (#​24273)
• [pyupgrade] Ignore strings with string-only escapes (UP012) (#​16058)
• [ruff] RUF072: skip formfeeds on dedent (#​24308)
• [ruff] Avoid re-using symbol in RUF024 fix (#​24316)
• [ruff] Parenthesize expression in RUF050 fix (#​24234)
• Disallow starred expressions as values of starred expressions (#​24280)

Rule changes

• [flake8-simplify] Suppress SIM105 for except* before Python 3.12 (#​23869)
• [pyflakes] Extend F507 to flag %-format strings with zero placeholders (#​24215)
• [pyupgrade] UP018 should detect more unnecessarily wrapped literals (UP018) (#​24093)
• [pyupgrade] Fix UP008 callable scope handling to support lambdas (#​24274)
• [ruff] RUF010: Mark fix as unsafe when it deletes a comment (#​24270)

Formatter

• Add nested-string-quote-style formatting option (#​24312)

Documentation

• [flake8-bugbear] Clarify RUF071 fix safety for non-path string comparisons (#​24149)
• [flake8-type-checking] Clarify import cycle wording for TC001/TC002/TC003 (#​24322)

Other changes

• Avoid rendering fix lines with trailing whitespace after | (#​24343)

Contributors

• @​charliermarsh
• @​MichaReiser
• @​tranhoangtu-it
• @​dylwil3
• @​zsol
• [@​renovate](https://redirect.github.com/reno

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