[refurb] Fix FURB101 and FURB103 false positives when I/O variable is used later by chirizxc · Pull Request #23542 · astral-sh/ruff (original) (raw)

added 2 commits

February 24, 2026 20:06

chirizxc changed the title[refurb] Fix FURB101, FURB103 [refurb] Fix FURB101 and FURB103 false positives when I/O variable is used later

Feb 24, 2026

chirizxc changed the title[refurb] Fix FURB101 and FURB103 false positives when I/O variable is used later [refurb] Fix FURB101 and FURB103 false positives when I/O variable is used later

Feb 24, 2026

amyreese added the fixes

Related to suggested fixes for violations

label

Feb 24, 2026

chirizxc marked this pull request as ready for review

February 26, 2026 18:55

carljm added a commit that referenced this pull request

Mar 16, 2026

• main: [ty] Split up types/class.rs (#23714) [ty] Rework module resolution to be breadth-first instead of depth-first (#22449) [ty] Move tests and type-alias-related code out of types.rs (#23711) [ty] Move TypeVar-related code to a types::typevar submodule (#23710) Fail CI on new linter ecosystem panics (#23597) [ty] Fix handling of non-Python text documents [ty] Move CallableType, and related methods/types, to a new types::callable submodule (#23707) [ty] Avoid stack overflow with recursive typevar (#23652) [ty] Add a diagnostic for an unused awaitable (#23650) [ty] Fix union *args binding for optional positional parameters (#23124) [refurb] Fix FURB101 and FURB103 false positives when I/O variable is used later (#23542) [ty] Fix type checking for multi-member enums within in a function block (#23683) [ty] Improve folding for decorators (#23543) [airflow] Extract common utilities for use in new rules (#23630)

nicopauss pushed a commit to Intersec/lib-common that referenced this pull request

Apr 1, 2026

Released on 2026-03-19.

• Display output severity in preview (#23845)

• Don't show noqa hover for non-Python documents (#24040)

• [pycodestyle] Recognize pyrefly: as a pragma comment (E501) (#24019)

• Don't return code actions for non-Python documents (#23905)

• Add company AI policy to contributing guide (#24021)

• Document editor features for Markdown code formatting (#23924)

• [pylint] Improve phrasing (PLC0208) (#24033)

• Use PEP 639 license information (#19661)

• @tmimmanuel

• @DimitriPapadopoulos

• @amyreese

• @statxc

• @dylwil3

• @hunterhogan

• @renovate

Released on 2026-03-12.

• Add support for lazy import parsing (#23755)

• Add support for star-unpacking of comprehensions (PEP 798) (#23788)

• Reject semantic syntax errors for lazy imports (#23757)

• Drop a few rules from the preview default set (#23879)

• [airflow] Flag Variable.get() calls outside of task execution context (AIR003) (#23584)

• [airflow] Flag runtime-varying values in DAG/task constructor arguments (AIR304) (#23631)

• [flake8-bugbear] Implement delattr-with-constant (B043) (#23737)

• [flake8-tidy-imports] Add TID254 to enforce lazy imports (#23777)

• [flake8-tidy-imports] Allow users to ban lazy imports with TID254 (#23847)

• [isort] Retain lazy keyword when sorting imports (#23762)

• [pyupgrade] Add from __future__ import annotations automatically (UP006) (#23260)

• [refurb] Support newline parameter in FURB101 for Python 3.13+ (#23754)

• [ruff] Add os-path-commonprefix (RUF071) (#23814)

• [ruff] Add unsafe fix for os-path-commonprefix (RUF071) (#23852)

• [ruff] Limit RUF036 to typing contexts; make it unsafe for non-typing-only (#23765)

• [ruff] Use starred unpacking for RUF017 in Python 3.15+ (#23789)

• Fix --add-noqa creating unwanted leading whitespace (#23773)

• Fix --add-noqa breaking shebangs (#23577)

• [formatter] Fix lambda body formatting for multiline calls and subscripts (#23866)

• [formatter] Preserve required annotation parentheses in annotated assignments (#23865)

• [formatter] Preserve type-expression parentheses in the formatter (#23867)

• [flake8-annotations] Fix stack overflow in ANN401 on quoted annotations with escape sequences (#23912)

• [pep8-naming] Check naming conventions in match pattern bindings (N806, N815, N816) (#23899)

• [perflint] Fix comment duplication in fixes (PERF401, PERF403) (#23729)

• [pyupgrade] Properly trigger super change in nested class (UP008) (#22677)

• [ruff] Avoid syntax errors in RUF036 fixes (#23764)

• [flake8-bandit] Flag S501 with requests.request (#23873)

• [flake8-executable] Fix WSL detection in non-Docker containers (#22879)

• [flake8-print] Ignore pprint calls with stream= (#23787)

• Update docs for Markdown code block formatting (#23871)

• [flake8-bugbear] Fix misleading description for B904 (#23731)

• @zsol

• @carljm

• @ntBre

• @Bortlesboat

• @sososonia-cyber

• @chirizxc

• @leandrobbraga

• @11happy

• @Acelogic

• @anishgirianish

• @amyreese

• @xvchris

• @charliermarsh

• @getehen

• @Dev-iL

Released on 2026-03-05.

• Discover Markdown files by default in preview mode (#23434)

• [perflint] Extend PERF102 to comprehensions and generators (#23473)

• [refurb] Fix FURB101 and FURB103 false positives when I/O variable is used later (#23542)

• [ruff] Add fix for none-not-at-end-of-union (RUF036) (#22829)

• [ruff] Fix false positive for re.split with empty string pattern (RUF055) (#23634)

• [fastapi] Handle callable class dependencies with __call__ method (FAST003) (#23553)

• [pydocstyle] Fix numpy section ordering (D420) (#23685)

• [pyflakes] Fix false positive for names shadowing re-exports (F811) (#23356)

• [pyupgrade] Avoid inserting redundant None elements in UP045 (#23459)

• Document extension mapping for Markdown code formatting (#23574)

• Update default Python version examples (#23605)

• Publish releases to Astral mirror (#23616)

• @amyreese

• @stakeswky

• @chirizxc

• @anishgirianish

• @bxff

• @zsol

• @charliermarsh

• @ntBre

• @kar-ganap

Released on 2026-02-26.

This is a follow-up release to 0.15.3 that resolves a panic when the new rule PLR1712 was enabled with any rule that analyzes definitions, such as many of the ANN or D rules.

• Fix panic on access to definitions after analyzing definitions (#23588)

• [pyflakes] Suppress false positive in F821 for names used before del in stub files (#23550)

• Clarify first-party import detection in Ruff (#23591)

• Fix incorrect import-heading example (#23568)

• @stakeswky

• @ntBre

• @thejcannon

• @GeObts

Released on 2026-02-26.

• Drop explicit support for .qmd file extension (#23572)

  This can now be enabled instead by setting the extension option:

  # ruff.toml
  extension = { qmd = "markdown" }
  
  # pyproject.toml
  [tool.ruff]
  extension = { qmd = "markdown" }

• Include configured extensions in file discovery (#23400)

• [flake8-bandit] Allow suspicious imports in TYPE_CHECKING blocks (S401-S415) (#23441)

• [flake8-bugbear] Allow B901 in pytest hook wrappers (#21931)

• [flake8-import-conventions] Add missing conventions from upstream (ICN001, ICN002) (#21373)

• [pydocstyle] Add rule to enforce docstring section ordering (D420) (#23537)

• [pylint] Implement swap-with-temporary-variable (PLR1712) (#22205)

• [ruff] Add unnecessary-assign-before-yield (RUF070) (#23300)

• [ruff] Support file-level noqa in RUF102 (#23535)

• [ruff] Suppress diagnostic for invalid f-strings before Python 3.12 (RUF027) (#23480)

• [flake8-bandit] Don't flag BaseLoader/CBaseLoader as unsafe (S506) (#23510)

• Avoid infinite loop between I002 and PYI025 (#23352)

• [pyflakes] Fix false positive for @overload from lint.typing-modules (F811) (#23357)

• [pyupgrade] Fix false positive for TypeVar default before Python 3.12 (UP046) (#23540)

• [pyupgrade] Fix handling of \N in raw strings (UP032) (#22149)

• Render sub-diagnostics in the GitHub output format (#23455)

• [flake8-bugbear] Tag certain B007 diagnostics as unnecessary (#23453)

• [ruff] Ignore unknown rule codes in RUF100 (#23531)

  These are now flagged by RUF102 instead.

• Fix missing settings links for several linters (#23519)

• Update isort action comments heading (#23515)

• [pydocstyle] Fix double comma in description of D404 (#23440)

• Update the Python module (notably find_ruff_bin) for parity with uv (#23406)

• @zanieb

• @o1x3

• @assadyousuf

• @kar-ganap

• @denyszhak

• @amyreese

• @carljm

• @anishgirianish

• @Bnyro

• @danparizher

• @ntBre

• @gcomneno

• @jaap3

• @stakeswky

Released on 2026-02-19.

• Expand the default rule set (#23385)

  In preview, Ruff now enables a significantly expanded default rule set of 412 rules, up from the stable default set of 59 rules. The new rules are mostly a superset of the stable defaults, with the exception of these rules, which are removed from the preview defaults:

  • multiple-imports-on-one-line (E401)
  • module-import-not-at-top-of-file (E402)
  • module-import-not-at-top-of-file (E701)
  • multiple-statements-on-one-line-semicolon (E702)
  • useless-semicolon (E703)
  • none-comparison (E711)
  • true-false-comparison (E712)
  • not-in-test (E713)
  • not-is-test (E714)
  • type-comparison (E721)
  • lambda-assignment (E731)
  • ambiguous-variable-name (E741)
  • ambiguous-class-name (E742)
  • ambiguous-function-name (E743)
  • undefined-local-with-import-star (F403)
  • undefined-local-with-import-star-usage (F405)
  • undefined-local-with-nested-import-star-usage (F406)
  • forward-annotation-syntax-error (F722)

  If you use preview and prefer the old defaults, you can restore them with configuration like:

  
  # ruff.toml
  
  [lint]
  select = ["E4", "E7", "E9", "F"]
  
  # pyproject.toml
  
  [tool.ruff.lint]
  select = ["E4", "E7", "E9", "F"]

  If you do give them a try, feel free to share your feedback in the GitHub discussion!

• [flake8-pyi] Also check string annotations (PYI041) (#19023)

• [flake8-async] Fix in_async_context logic (#23426)

• [ruff] Fix for RUF102 should delete entire comment (#23380)

• [ruff] Suppress diagnostic for strings with backslashes in interpolations before Python 3.12 (RUF027) (#21069)

• [flake8-bugbear] Fix B023 false positive for immediately-invoked lambdas (#23294)

• [parser] Fix false syntax error for match-like annotated assignments (#23297)

• [parser] Fix indentation tracking after line continuations (#23417)

• [flake8-executable] Allow global flags in uv shebangs (EXE003) (#22582)

• [pyupgrade] Fix handling of typing.{io,re} (UP035) (#23131)

• [ruff] Detect PLC0207 on chained str.split() calls (#23275)

• Remove invalid inline noqa warning (#23270)

• Add extension mapping to configuration file options (#23384)

• Add Q004 to the list of conflicting rules (#23340)

• [ruff] Expand lint.external docs and add sub-diagnostic (RUF100, RUF102) (#23268)

• @dylwil3

• @Jkhall81

• @danparizher

• @dhruvmanila

• @harupy

• @ngnpope

• @amyreese

• @kar-ganap

• @robsdedude

• @shaanmajid

• @ntBre

• @toslunar

Released on 2026-02-12.

• [airflow] Add ruff rules to catch deprecated Airflow imports for Airflow 3.1 (AIR321) (#22376)

• [airflow] Third positional parameter not named ti_key should be flagged for BaseOperatorLink.get_link (AIR303) (#22828)

• [flake8-gettext] Fix false negatives for plural argument of ngettext (INT001, INT002, INT003) (#21078)

• [pyflakes] Fix infinite loop in preview fix for unused-import (F401) (#23038)

• [pygrep-hooks] Detect non-existent mock methods in standalone expressions (PGH005) (#22830)

• [pylint] Allow dunder submodules and improve diagnostic range (PLC2701) (#22804)

• [pyupgrade] Improve diagnostic range for tuples (UP024) (#23013)

• [refurb] Check subscripts in tuple do not use lambda parameters in reimplemented-operator (FURB118) (#23079)

• [ruff] Detect mutable defaults in field calls (RUF008) (#23046)

• [ruff] Ignore std cmath.inf (RUF069) (#23120)

• [ruff] New rule float-equality-comparison (RUF069) (#20585)

• Don't format unlabeled Markdown code blocks (#23106)

• Markdown formatting support in LSP (#23063)

• Support Quarto Markdown language markers (#22947)

• Support formatting pycon Markdown code blocks (#23112)

• Use extension mapping to select Markdown code block language (#22934)

• Avoid false positive for undefined variables in FAST001 (#23224)

• Avoid introducing syntax errors for FAST003 autofix (#23227)

• Avoid suggesting InitVar for __post_init__ that references PEP 695 type parameters (#23226)

• Deduplicate type variables in generic functions (#23225)

• Fix exception handler parenthesis removal for Python 3.14+ (#23126)

• Fix f-string middle panic when parsing t-strings (#23232)

• Wrap RUF020 target for multiline fixes (#23210)

• Wrap UP007 target for multiline fixes (#23208)

• Fix missing diagnostics for last range suppression in file (#23242)

• [pyupgrade] Fix syntax error on string with newline escape and comment (UP037) (#22968)

• Use ruff instead of Ruff as the program name in GitHub output format (#23240)

• [PT006] Fix syntax error when unpacking nested tuples in parametrize fixes (#22441) (#22464)

• [airflow] Catch deprecated attribute access from context key for Airflow 3.0 (AIR301) (#22850)

• [airflow] Capture deprecated arguments and a decorator (AIR301) (#23170)

• [flake8-boolean-trap] Add multiprocessing.Value to excluded functions for FBT003 (#23010)

• [flake8-bugbear] Add a secondary annotation showing the previous occurrence (B033) (#22634)

• [flake8-type-checking] Add sub-diagnostic showing the runtime use of an annotation (TC004) (#23091)

• [isort] Support configurable import section heading comments (#23151)

• [ruff] Improve the diagnostic for RUF012 (#23202)

• Suppress diagnostic output for format --check --silent (#17736)

• Add tabbed shell completion documentation (#23169)

• Explain how to enable Markdown formatting for pre-commit hook (#23077)

• Fixed import in runtime-evaluated-decorators example (#23187)

• Update ruff server contributing guide (#23060)

• Exclude WASM artifacts from GitHub releases (#23221)

• @mkniewallner

• @bxff

• @dylwil3

• @Avasam

• @amyreese

• @charliermarsh

• @Alex-ley-scrub

• @Kalmaegi

• @danparizher

• @AiyionPrime

• @eureka928

• @11happy

• @Jkhall81

• @chirizxc

• @leandrobbraga

• @tvatter

• @anishgirianish

• @shaanmajid

• @ntBre

• @sjyangkevin

Released on 2026-02-03.

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

• Ruff now formats your code according to the 2026 style guide. See the formatter section below or in the blog post for a detailed list of changes.

• The linter now supports block suppression comments. For example, to suppress N803 for all parameters in this function:

  # ruff: disable[N803]
  def foo(
      legacyArg1,
      legacyArg2,
      legacyArg3,
      legacyArg4,
  ): ...
  # ruff: enable[N803]

  See the documentation for more details.

• The ruff:alpine Docker image is now based on Alpine 3.23 (up from 3.21).

• The ruff:debian and ruff:debian-slim Docker images are now based on Debian 13 "Trixie" instead of Debian 12 "Bookworm."

• Binaries for the ppc64 (64-bit big-endian PowerPC) architecture are no longer included in our releases. It should still be possible to build Ruff manually for this platform, if needed.

• Ruff now resolves all extended configuration files before falling back on a default Python version.

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

• blocking-http-call-httpx-in-async-function (ASYNC212)
• blocking-path-method-in-async-function (ASYNC240)
• blocking-input-in-async-function (ASYNC250)
• map-without-explicit-strict (B912)
• if-exp-instead-of-or-operator (FURB110)
• single-item-membership-test (FURB171)
• missing-maxsplit-arg (PLC0207)
• unnecessary-lambda (PLW0108)
• unnecessary-empty-iterable-within-deque-call (RUF037)
• in-empty-collection (RUF060)
• legacy-form-pytest-raises (RUF061)
• non-octal-permissions (RUF064)
• invalid-rule-code (RUF102)
• invalid-suppression-comment (RUF103)
• unmatched-suppression-comment (RUF104)
• replace-str-enum (UP042)

The following behaviors have been stabilized:

• The --output-format flag is now respected when running Ruff in --watch mode, and the full output format is now used by default, matching the regular CLI output.
• builtin-attribute-shadowing (A003) now detects the use of shadowed built-in names in additional contexts like decorators, default arguments, and other attribute definitions.
• duplicate-union-member (PYI016) now considers typing.Optional when searching for duplicate union members.
• split-static-string (SIM905) now offers an autofix when the maxsplit argument is provided, even without a sep argument.
• dict-get-with-none-default (SIM910) now applies to more types of key expressions.
• super-call-with-parameters (UP008) now has a safe fix when it will not delete comments.
• unnecessary-default-type-args (UP043) now applies to stub (.pyi) files on Python versions before 3.13.

This release introduces the new 2026 style guide, with the following changes:

• Lambda parameters are now kept on the same line and lambda bodies will be parenthesized to let them break across multiple lines (#21385)

• Parentheses around tuples of exceptions in except clauses will now be removed on Python 3.14 and later (#20768)

• A single empty line is now permitted at the beginning of function bodies (#21110)

• Parentheses are avoided for long as captures in match statements (#21176)

• Extra spaces between escaped quotes and ending triple quotes can now be omitted (#17216)

• Blank lines are now enforced before classes with decorators in stub files (#18888)

• Apply formatting to Markdown code blocks (#22470, #22990, #22996)

  See the documentation for more details.

• Fix suppression indentation matching (#22903)

• Customize where the fix_title sub-diagnostic appears (#23044)

• [FastAPI] Add sub-diagnostic explaining why a fix was unavailable (FAST002) (#22565)

• [flake8-annotations] Don't suggest NoReturn for functions raising NotImplementedError (ANN201, ANN202, ANN205, ANN206) (#21311)

• [pyupgrade] Make fix unsafe if it deletes comments (UP017) (#22873)

• [pyupgrade] Make fix unsafe if it deletes comments (UP020) (#22872)

• [pyupgrade] Make fix unsafe if it deletes comments (UP033) (#22871)

• [refurb] Do not add abc.ABC if already present (FURB180) (#22234)

• [refurb] Make fix unsafe if it deletes comments (FURB110) (#22768)

• [ruff] Add sub-diagnostics with permissions (RUF064) (#22972)

• Identify notebooks by LSP didOpen instead of .ipynb file extension (#22810)

• Add --color CLI option to force colored output (#22806)

• Document - stdin convention in CLI help text (#22817)

• [refurb] Change example to re.search with ^ anchor (FURB167) (#22984)

• Fix link to Sphinx code block directives (#23041)

• [pydocstyle] Clarify which quote styles are allowed (D300) (#22825)

• [flake8-bugbear] Improve docs for no-explicit-stacklevel (B028) (#22538)

• Update MSRV to 1.91 (#22874)

• @danparizher

• @chirizxc

• @amyreese

• @Jkhall81

• @cwkang1998

• @manzt

• @11happy

• @hugovk

• @caiquejjx

• @ntBre

• @akawd

• @konstin

Renovate-Branch: renovate/2024.6-ruff-0.x Change-Id: I8f8e865435fde1fc736fe2528261a604acb46215 Priv-Id: f7e1d99008e3617149c4b639a9a2bbc06212d064

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