[flake8-bugbear] Clarify RUF071 fix safety for non-path string comparisons#24149
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MichaReiser merged 3 commits intoMar 27, 2026
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Thanks! This also looks good to me overall, but I had a couple of suggestions.
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@ntBre Thanks for the review! I have addressed all three points:
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Add documentation explaining that os.path.commonprefix is valid for non-path string comparisons (e.g., version numbers, identifiers) and that RUF071 should be ignored in such cases. Adds a 'Fix safety' section documenting the semantic differences between commonprefix and commonpath with examples. Fixes astral-sh#24028
- Remove redundant non-path note (redundant with Fix safety section) - Link to general suppression docs instead of specific mechanisms - Fix incorrect ValueError claim: commonpath returns empty string
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Typing conformance resultsNo changes detected ✅Current numbersThe percentage of diagnostics emitted that were expected errors held steady at 86.59%. The percentage of expected errors that received a diagnostic held steady at 80.96%. The number of fully passing files held steady at 68/132. |
Memory usage reportMemory usage unchanged ✅ |
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| Lint rule | Added | Removed | Changed |
|---|---|---|---|
invalid-await |
40 | 0 | 0 |
invalid-return-type |
1 | 0 | 0 |
| Total | 41 | 0 | 0 |
Changes in flaky projects detected. Raw diff output excludes flaky projects; see the HTML report for details.
carljm
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* main: (40 commits) [ty] resolve union-likes in emitting union attribute errors (#24263) [ty] Improve support for `Callable` type context (#23888) [ty] Propagate type context through `await` expressions (#24256) [`pyflakes`] Flag annotated variable redeclarations as `F811` in preview mode (#24244) [ty] Preserve `Divergent` when materializing recursive aliases (#24245) Fix W391 fixes for consecutive empty notebook cells (#24236) [flake8-bugbear] Clarify RUF071 fix safety for non-path string comparisons (#24149) [ty] Ban type qualifiers in PEP-695 type aliases (#24242) [ty] Include keyword-prefixed symbols in completions for attributes (#24232) [ty] Add tests for TypedDict method overloads on unions (#24230) [ty] report unused bindings as unnecessary hint diagnostics (#23305) Remove unused `non_root` variable (#24238) Extend F507 to flag %-format strings with zero placeholders (#24215) [`flake8-simplify`] Suppress `SIM105` for `except*` before Python 3.12 (#23869) Ignore pre-initialization references in SIM113 (#24235) Parenthesize expression in RUF050 fix (#24234) Publish playgrounds using the `release-playground` environment (#24223) [ty] Fix instance-attribute lookup in methods of protocol classes (#24213) [ty] Used shared expression cache during generic call inference (#24219) [ty] make `Type::BoundMethod` include instances of same-named methods bound to a subclass (#24039) ...
nicopauss
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##### [\`v0.15.10\`](https://github.com/astral-sh/ruff/blob/HEAD/CHANGELOG.md#01510) Released on 2026-04-09. ##### Preview features - \[`flake8-logging`] Allow closures in except handlers (`LOG004`) ([#24464](astral-sh/ruff#24464)) - \[`flake8-self`] Make `SLF` diagnostics robust to non-self-named variables ([#24281](astral-sh/ruff#24281)) - \[`flake8-simplify`] Make the fix for `collapsible-if` safe in `preview` (`SIM102`) ([#24371](astral-sh/ruff#24371)) ##### Bug fixes - Avoid emitting multi-line f-string elements before Python 3.12 ([#24377](astral-sh/ruff#24377)) - Avoid syntax error from `E502` fixes in f-strings and t-strings ([#24410](astral-sh/ruff#24410)) - Strip form feeds from indent passed to `dedent_to` ([#24381](astral-sh/ruff#24381)) - \[`pyupgrade`] Fix panic caused by handling of octals (`UP012`) ([#24390](astral-sh/ruff#24390)) - Reject multi-line f-string elements before Python 3.12 ([#24355](astral-sh/ruff#24355)) ##### Rule changes - \[`ruff`] Treat f-string interpolation as potential side effect (`RUF019`) ([#24426](astral-sh/ruff#24426)) ##### Server - Add support for custom file extensions ([#24463](astral-sh/ruff#24463)) ##### Documentation - Document adding fixes in CONTRIBUTING.md ([#24393](astral-sh/ruff#24393)) - Fix JSON typo in settings example ([#24517](astral-sh/ruff#24517)) ##### Contributors - [@charliermarsh](https://github.com/charliermarsh) - [@dylwil3](https://github.com/dylwil3) - [@silverstein](https://github.com/silverstein) - [@anishgirianish](https://github.com/anishgirianish) - [@shizukushq](https://github.com/shizukushq) - [@zanieb](https://github.com/zanieb) - [@AlexWaygood](https://github.com/AlexWaygood) ##### [\`v0.15.9\`](https://github.com/astral-sh/ruff/blob/HEAD/CHANGELOG.md#0159) Released on 2026-04-02. ##### Preview features - \[`pyflakes`] Flag annotated variable redeclarations as `F811` in preview mode ([#24244](astral-sh/ruff#24244)) - \[`ruff`] Allow dunder-named assignments in non-strict mode for `RUF067` ([#24089](astral-sh/ruff#24089)) ##### Bug fixes - \[`flake8-errmsg`] Avoid shadowing existing `msg` in fix for `EM101` ([#24363](astral-sh/ruff#24363)) - \[`flake8-simplify`] Ignore pre-initialization references in `SIM113` ([#24235](astral-sh/ruff#24235)) - \[`pycodestyle`] Fix `W391` fixes for consecutive empty notebook cells ([#24236](astral-sh/ruff#24236)) - \[`pyupgrade`] Fix `UP008` nested class matching ([#24273](astral-sh/ruff#24273)) - \[`pyupgrade`] Ignore strings with string-only escapes (`UP012`) ([#16058](astral-sh/ruff#16058)) - \[`ruff`] `RUF072`: skip formfeeds on dedent ([#24308](astral-sh/ruff#24308)) - \[`ruff`] Avoid re-using symbol in `RUF024` fix ([#24316](astral-sh/ruff#24316)) - \[`ruff`] Parenthesize expression in `RUF050` fix ([#24234](astral-sh/ruff#24234)) - Disallow starred expressions as values of starred expressions ([#24280](astral-sh/ruff#24280)) ##### Rule changes - \[`flake8-simplify`] Suppress `SIM105` for `except*` before Python 3.12 ([#23869](astral-sh/ruff#23869)) - \[`pyflakes`] Extend `F507` to flag `%`-format strings with zero placeholders ([#24215](astral-sh/ruff#24215)) - \[`pyupgrade`] `UP018` should detect more unnecessarily wrapped literals (UP018) ([#24093](astral-sh/ruff#24093)) - \[`pyupgrade`] Fix `UP008` callable scope handling to support lambdas ([#24274](astral-sh/ruff#24274)) - \[`ruff`] `RUF010`: Mark fix as unsafe when it deletes a comment ([#24270](astral-sh/ruff#24270)) ##### Formatter - Add `nested-string-quote-style` formatting option ([#24312](astral-sh/ruff#24312)) ##### Documentation - \[`flake8-bugbear`] Clarify RUF071 fix safety for non-path string comparisons ([#24149](astral-sh/ruff#24149)) - \[`flake8-type-checking`] Clarify import cycle wording for `TC001`/`TC002`/`TC003` ([#24322](astral-sh/ruff#24322)) ##### Other changes - Avoid rendering fix lines with trailing whitespace after `|` ([#24343](astral-sh/ruff#24343)) ##### Contributors - [@charliermarsh](https://github.com/charliermarsh) - [@MichaReiser](https://github.com/MichaReiser) - [@tranhoangtu-it](https://github.com/tranhoangtu-it) - [@dylwil3](https://github.com/dylwil3) - [@zsol](https://github.com/zsol) - [@renovate](https://github.com/renovate) - [@bitloi](https://github.com/bitloi) - [@danparizher](https://github.com/danparizher) - [@chinar-amrutkar](https://github.com/chinar-amrutkar) - [@second-ed](https://github.com/second-ed) - [@getehen](https://github.com/getehen) - [@Redovo1](https://github.com/Redovo1) - [@matthewlloyd](https://github.com/matthewlloyd) - [@zanieb](https://github.com/zanieb) - [@InSyncWithFoo](https://github.com/InSyncWithFoo) - [@RenzoMXD](https://github.com/RenzoMXD) Renovate-Branch: renovate/2024.6-ruff-0.15.x Change-Id: Id4bd542d4f128b509284d9dcda312f2b39c29964 Priv-Id: 28ebcacdeffa50cec7a52eee59091a75ca5e9539
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Summary
Fixes #24028
Added documentation explaining that
os.path.commonprefixis valid for non-path string comparisons (e.g., finding a common prefix among version numbers or identifiers), and thatos.path.commonpathcannot be used as a drop-in replacement in those cases since it raisesValueErroron non-path strings.Added a "Fix safety" section explaining why the fix is marked as unsafe, with concrete examples showing the semantic difference between
commonprefix(character-by-character) andcommonpath(path-component-level).Test Plan
Existing tests pass. Documentation change only (rule definition in
os_path_commonprefix.rs).