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[pylint] Avoid false positive on starred elements (PLE0643) - #29483
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pylint] Avoid false positive in potential-index-error for starred literals (PLE0643)pylint] Avoid false positive on starred elements (PLE0643)
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This PR contains the following updates: | Package | Type | Update | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) | |---|---|---|---|---|---| | [DavidAnson/markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) | repository | minor | `v0.23.3` → `v0.24.0` |  |  | | [ruff](https://docs.astral.sh/ruff) ([source](https://github.com/astral-sh/ruff), [changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)) | dependency-groups | patch | `==0.17.1` → `==0.17.3` |  |  | Note: The `pre-commit` manager in Renovate is not supported by the `pre-commit` maintainers or community. Please do not report any problems there, instead [create a Discussion in the Renovate repository](https://github.com/renovatebot/renovate/discussions/new) if you have any questions. --- ### Release Notes <details> <summary>DavidAnson/markdownlint-cli2</summary> ### [`v0.24.0`](DavidAnson/markdownlint-cli2@v0.23.3...v0.24.0) [Compare Source](DavidAnson/markdownlint-cli2@v0.23.3...v0.24.0) </details> <details> <summary>astral-sh/ruff (ruff)</summary> ### [`v0.17.3`](https://github.com/astral-sh/ruff/blob/HEAD/CHANGELOG.md#0173) [Compare Source](astral-sh/ruff@0.17.2...0.17.3) Released on 2026-10-26. ##### Preview features - \[`suspicious`] Add `shared-clock-mock` ([#​29074](astral-sh/ruff#29074)) ##### Bug fixes - \[`pyupgrade`] Avoid incorrect conversions to f-strings (`UP032`) ([#​25485](astral-sh/ruff#25485)) ##### Performance - Buffer stdout in `ruff format` ([#​29631](astral-sh/ruff#29631)) - Specialize ASCII identifier lexing ([#​29503](astral-sh/ruff#29503)) - Speed up identifier and keyword lexing ([#​29463](astral-sh/ruff#29463)) ##### Documentation - \[`flake8-bandit`] Describe what the rule actually checks for `httpx` (`S113`) ([#​27936](astral-sh/ruff#27936)) ##### Contributors - [@​itsvedantkumar](https://github.com/itsvedantkumar) - [@​charliermarsh](https://github.com/charliermarsh) - [@​anishgirianish](https://github.com/anishgirianish) ### [`v0.17.2`](https://github.com/astral-sh/ruff/blob/HEAD/CHANGELOG.md#0172) [Compare Source](astral-sh/ruff@0.17.1...0.17.2) Released on 2026-10-22. ##### Preview features - \[`complexity`] Add `unnecessary-regular-expression-compile` ([#​25533](astral-sh/ruff#25533)) ##### Bug fixes - Avoid syntax errors for type variables with starred constraints (`UP040`, `UP046`, `UP047`, `RUF053`) ([#​28362](astral-sh/ruff#28362)) - \[`pydocstyle`] Treat backslash-escaped `*args` and `**kwargs` as documented (`D417`) ([#​29536](astral-sh/ruff#29536)) - \[`pylint`] Avoid false positive on starred elements (`PLE0643`) ([#​29483](astral-sh/ruff#29483)) - \[`pylint`] Mark fixes unsafe when deleting comments (`PLR5501`, `PLW0120`) ([#​29414](astral-sh/ruff#29414)) - \[`pyupgrade`] Mark fix unsafe when deleting comments (`UP035`) ([#​29413](astral-sh/ruff#29413)) ##### Performance - Avoid intermediate names in lint name resolution ([#​29506](astral-sh/ruff#29506)) - Prefilter bidirectional Unicode checks by UTF-8 leading bytes ([#​29561](astral-sh/ruff#29561)) - Share postfix parsing and reduce expression copies ([#​29480](astral-sh/ruff#29480)) ##### Configuration - \[`pylint`] Add a configurable allowlist for `magic-value-comparison` (`PLR2004`) ([#​18961](astral-sh/ruff#18961)) ##### Documentation - Clarify documentation and correct stale guidance ([#​29374](astral-sh/ruff#29374)) - \[`pyupgrade`] Remove mentions of variance related to fix safety (`UP040`, `UP047`) ([#​29592](astral-sh/ruff#29592)) ##### Contributors - [@​fixfon](https://github.com/fixfon) - [@​MichaReiser](https://github.com/MichaReiser) - [@​zaniebot](https://github.com/zaniebot) - [@​FrancescoPezzella](https://github.com/FrancescoPezzella) - [@​anishgirianish](https://github.com/anishgirianish) - [@​rajveer3x](https://github.com/rajveer3x) - [@​charliermarsh](https://github.com/charliermarsh) - [@​LckyLike](https://github.com/LckyLke) - [@​DaniBodor](https://github.com/DaniBodor) </details> --- ### Configuration 📅 **Schedule**: (in timezone America/Denver) - Branch creation - Between 02:00 AM and 06:59 AM, only on Tuesday (`* 2-6 * * 2`) - 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. 👻 **Immortal**: This PR will be recreated if closed unmerged. Get [config help](https://github.com/renovatebot/renovate/discussions) if that's undesired. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate CLI](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0NC4xNDguMyIsInVwZGF0ZWRJblZlciI6IjQ0LjE0OC4zIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJyZW5vdmF0ZSJdfQ==--> Reviewed-on: https://git.lichtenwalter.site/rlichten/dir2text/pulls/100
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Summary
Closes #29343.
potential-index-error(PLE0643) statically calculates the length of sequence literals (lists and tuples) using the count of AST elements (elts.len()). When a sequence contains starred expressions (e.g.,(*a, 9)[2]or[*a, *a][2]), the starred element is counted as a single item, causingPLE0643to falsely flag valid indexing that will not raise anIndexErrorat runtime.This change skips
PLE0643whenever a sequence literal contains anyExpr::Starredelement, as its runtime length cannot be determined statically.Test Plan
Added regression test cases to
crates/ruff_linter/resources/test/fixtures/pylint/potential_index_error.pycovering unpacked elements in both tuples and lists. Verified locally withcargo test -p ruff_linter -- rules::pylint,cargo clippy,cargo fmt --check, and repository pre-commit hooks (prek).