Ruff

Highlights include:

- Initial support formatting f-strings (in `--preview`).
- Support for overriding arbitrary configuration options via the CLI through an expanded `--config` argument (e.g., `--config "lint.isort.combine-as-imports=false"`).
- Significant performance improvements in Ruff's lexer, parser, and lint rules.

Preview features

- Implement minimal f-string formatting ([9642](https://github.com/astral-sh/ruff/pull/9642))
- \[`pycodestyle`\] Add blank line(s) rules (`E301`, `E302`, `E303`, `E304`, `E305`, `E306`) ([9266](https://github.com/astral-sh/ruff/pull/9266))
- \[`refurb`\] Implement `readlines_in_for` (`FURB129`) ([9880](https://github.com/astral-sh/ruff/pull/9880))

Rule changes

- \[`ruff`\] Ensure closing parentheses for multiline sequences are always on their own line (`RUF022`, `RUF023`) ([9793](https://github.com/astral-sh/ruff/pull/9793))
- \[`numpy`\] Add missing deprecation violations (`NPY002`) ([9862](https://github.com/astral-sh/ruff/pull/9862))
- \[`flake8-bandit`\] Detect `mark_safe` usages in decorators ([9887](https://github.com/astral-sh/ruff/pull/9887))
- \[`ruff`\] Expand `asyncio-dangling-task` (`RUF006`) to include `new_event_loop` ([9976](https://github.com/astral-sh/ruff/pull/9976))
- \[`flake8-pyi`\] Ignore 'unused' private type dicts in class scopes ([9952](https://github.com/astral-sh/ruff/pull/9952))

Formatter

- Docstring formatting: Preserve tab indentation when using `indent-style=tabs` ([9915](https://github.com/astral-sh/ruff/pull/9915))
- Disable top-level docstring formatting for notebooks ([9957](https://github.com/astral-sh/ruff/pull/9957))
- Stabilize quote-style's `preserve` mode ([9922](https://github.com/astral-sh/ruff/pull/9922))

CLI

- Allow arbitrary configuration options to be overridden via the CLI ([9599](https://github.com/astral-sh/ruff/pull/9599))

Bug fixes

- Make `show-settings` filters directory-agnostic ([9866](https://github.com/astral-sh/ruff/pull/9866))
- Respect duplicates when rewriting type aliases ([9905](https://github.com/astral-sh/ruff/pull/9905))
- Respect tuple assignments in typing analyzer ([9969](https://github.com/astral-sh/ruff/pull/9969))
- Use atomic write when persisting cache ([9981](https://github.com/astral-sh/ruff/pull/9981))
- Use non-parenthesized range for `DebugText` ([9953](https://github.com/astral-sh/ruff/pull/9953))
- \[`flake8-simplify`\] Avoid false positive with `async` for loops (`SIM113`) ([9996](https://github.com/astral-sh/ruff/pull/9996))
- \[`flake8-trio`\] Respect `async with` in `timeout-without-await` ([9859](https://github.com/astral-sh/ruff/pull/9859))
- \[`perflint`\] Catch a wider range of mutations in `PERF101` ([9955](https://github.com/astral-sh/ruff/pull/9955))
- \[`pycodestyle`\] Fix `E30X` panics on blank lines with trailing white spaces ([9907](https://github.com/astral-sh/ruff/pull/9907))
- \[`pydocstyle`\] Allow using `parameters` as a subsection header (`D405`) ([9894](https://github.com/astral-sh/ruff/pull/9894))
- \[`pydocstyle`\] Fix blank-line docstring rules for module-level docstrings ([9878](https://github.com/astral-sh/ruff/pull/9878))
- \[`pylint`\] Accept 0.0 and 1.0 as common magic values (`PLR2004`) ([9964](https://github.com/astral-sh/ruff/pull/9964))
- \[`pylint`\] Avoid suggesting set rewrites for non-hashable types ([9956](https://github.com/astral-sh/ruff/pull/9956))
- \[`ruff`\] Avoid false negatives with string literals inside of method calls (`RUF027`) ([9865](https://github.com/astral-sh/ruff/pull/9865))
- \[`ruff`\] Fix panic on with f-string detection (`RUF027`) ([9990](https://github.com/astral-sh/ruff/pull/9990))
- \[`ruff`\] Ignore builtins when detecting missing f-strings ([9849](https://github.com/astral-sh/ruff/pull/9849))

Performance

- Use `memchr` for string lexing ([9888](https://github.com/astral-sh/ruff/pull/9888))
- Use `memchr` for tab-indentation detection ([9853](https://github.com/astral-sh/ruff/pull/9853))
- Reduce `Result<Tok, LexicalError>` size by using `Box<str>` instead of `String` ([9885](https://github.com/astral-sh/ruff/pull/9885))
- Reduce size of `Expr` from 80 to 64 bytes ([9900](https://github.com/astral-sh/ruff/pull/9900))
- Improve trailing comma rule performance ([9867](https://github.com/astral-sh/ruff/pull/9867))
- Remove unnecessary string cloning from the parser ([9884](https://github.com/astral-sh/ruff/pull/9884))

This release includes support for range formatting (i.e., the ability to format specific lines
within a source file).

Preview features

- \[`refurb`\] Implement `missing-f-string-syntax` (`RUF027`) ([9728](https://github.com/astral-sh/ruff/pull/9728))
- Format module-level docstrings ([9725](https://github.com/astral-sh/ruff/pull/9725))

Formatter

- Add `--range` option to `ruff format` ([9733](https://github.com/astral-sh/ruff/pull/9733))
- Don't trim last empty line in docstrings ([9813](https://github.com/astral-sh/ruff/pull/9813))

Bug fixes

- Skip empty lines when determining base indentation ([9795](https://github.com/astral-sh/ruff/pull/9795))
- Drop `__get__` and `__set__` from `unnecessary-dunder-call` ([9791](https://github.com/astral-sh/ruff/pull/9791))
- Respect generic `Protocol` in ellipsis removal ([9841](https://github.com/astral-sh/ruff/pull/9841))
- Revert "Use publicly available Apple Silicon runners (9726)" ([9834](https://github.com/astral-sh/ruff/pull/9834))

Performance

- Skip LibCST parsing for standard dedent adjustments ([9769](https://github.com/astral-sh/ruff/pull/9769))
- Remove CST-based fixer for `C408` ([9822](https://github.com/astral-sh/ruff/pull/9822))
- Add our own ignored-names abstractions ([9802](https://github.com/astral-sh/ruff/pull/9802))
- Remove CST-based fixers for `C400`, `C401`, `C410`, and `C418` ([9819](https://github.com/astral-sh/ruff/pull/9819))
- Use `AhoCorasick` to speed up quote match ([9773](https://github.com/astral-sh/ruff/pull/9773))
- Remove CST-based fixers for `C405` and `C409` ([9821](https://github.com/astral-sh/ruff/pull/9821))
- Add fast-path for comment detection ([9808](https://github.com/astral-sh/ruff/pull/9808))
- Invert order of checks in `zero-sleep-call` ([9766](https://github.com/astral-sh/ruff/pull/9766))
- Short-circuit typing matches based on imports ([9800](https://github.com/astral-sh/ruff/pull/9800))
- Run dunder method rule on methods directly ([9815](https://github.com/astral-sh/ruff/pull/9815))
- Track top-level module imports in the semantic model ([9775](https://github.com/astral-sh/ruff/pull/9775))
- Slight speed-up for lowercase and uppercase identifier checks ([9798](https://github.com/astral-sh/ruff/pull/9798))
- Remove LibCST-based fixer for `C403` ([9818](https://github.com/astral-sh/ruff/pull/9818))

Documentation

- Update `max-pos-args` example to `max-positional-args` ([9797](https://github.com/astral-sh/ruff/pull/9797))
- Fixed example code in `weak_cryptographic_key.rs` ([9774](https://github.com/astral-sh/ruff/pull/9774))
- Fix references to deprecated `ANN` rules in changelog ([9771](https://github.com/astral-sh/ruff/pull/9771))
- Fix default for `max-positional-args` ([9838](https://github.com/astral-sh/ruff/pull/9838))

Breaking changes

- The `NURSERY` selector cannot be used anymore
- Legacy selection of nursery rules by exact codes is no longer allowed without preview enabled

See also, the "Remapped rules" section which may result in disabled rules.

Deprecations

The following rules are now deprecated:

- [`missing-type-self`](https://docs.astral.sh/ruff/rules/missing-type-self/) (`ANN101`)
- [`missing-type-cls`](https://docs.astral.sh/ruff/rules/missing-type-cls/) (`ANN102`)

The following command line options are now deprecated:

- `--show-source`; use `--output-format full` instead
- `--no-show-source`; use `--output-format concise` instead
- `--output-format text`; use `full` or `concise` instead

The following settings have moved and the previous name is deprecated:

- `ruff.allowed-confusables` → [`ruff.lint.allowed-confusables`](https://docs.astral.sh//ruff/settings/#lint_allowed-confusables)
- `ruff.dummy-variable-rgx` → [`ruff.lint.dummy-variable-rgx`](https://docs.astral.sh//ruff/settings/#lint_dummy-variable-rgx)
- `ruff.explicit-preview-rules` → [`ruff.lint.explicit-preview-rules`](https://docs.astral.sh//ruff/settings/#lint_explicit-preview-rules)
- `ruff.extend-fixable` → [`ruff.lint.extend-fixable`](https://docs.astral.sh//ruff/settings/#lint_extend-fixable)
- `ruff.extend-ignore` → [`ruff.lint.extend-ignore`](https://docs.astral.sh//ruff/settings/#lint_extend-ignore)
- `ruff.extend-per-file-ignores` → [`ruff.lint.extend-per-file-ignores`](https://docs.astral.sh//ruff/settings/#lint_extend-per-file-ignores)
- `ruff.extend-safe-fixes` → [`ruff.lint.extend-safe-fixes`](https://docs.astral.sh//ruff/settings/#lint_extend-safe-fixes)
- `ruff.extend-select` → [`ruff.lint.extend-select`](https://docs.astral.sh//ruff/settings/#lint_extend-select)
- `ruff.extend-unfixable` → [`ruff.lint.extend-unfixable`](https://docs.astral.sh//ruff/settings/#lint_extend-unfixable)
- `ruff.extend-unsafe-fixes` → [`ruff.lint.extend-unsafe-fixes`](https://docs.astral.sh//ruff/settings/#lint_extend-unsafe-fixes)
- `ruff.external` → [`ruff.lint.external`](https://docs.astral.sh//ruff/settings/#lint_external)
- `ruff.fixable` → [`ruff.lint.fixable`](https://docs.astral.sh//ruff/settings/#lint_fixable)
- `ruff.flake8-annotations` → [`ruff.lint.flake8-annotations`](https://docs.astral.sh//ruff/settings/#lint_flake8-annotations)
- `ruff.flake8-bandit` → [`ruff.lint.flake8-bandit`](https://docs.astral.sh//ruff/settings/#lint_flake8-bandit)
- `ruff.flake8-bugbear` → [`ruff.lint.flake8-bugbear`](https://docs.astral.sh//ruff/settings/#lint_flake8-bugbear)
- `ruff.flake8-builtins` → [`ruff.lint.flake8-builtins`](https://docs.astral.sh//ruff/settings/#lint_flake8-builtins)
- `ruff.flake8-comprehensions` → [`ruff.lint.flake8-comprehensions`](https://docs.astral.sh//ruff/settings/#lint_flake8-comprehensions)
- `ruff.flake8-copyright` → [`ruff.lint.flake8-copyright`](https://docs.astral.sh//ruff/settings/#lint_flake8-copyright)
- `ruff.flake8-errmsg` → [`ruff.lint.flake8-errmsg`](https://docs.astral.sh//ruff/settings/#lint_flake8-errmsg)
- `ruff.flake8-gettext` → [`ruff.lint.flake8-gettext`](https://docs.astral.sh//ruff/settings/#lint_flake8-gettext)
- `ruff.flake8-implicit-str-concat` → [`ruff.lint.flake8-implicit-str-concat`](https://docs.astral.sh//ruff/settings/#lint_flake8-implicit-str-concat)
- `ruff.flake8-import-conventions` → [`ruff.lint.flake8-import-conventions`](https://docs.astral.sh//ruff/settings/#lint_flake8-import-conventions)
- `ruff.flake8-pytest-style` → [`ruff.lint.flake8-pytest-style`](https://docs.astral.sh//ruff/settings/#lint_flake8-pytest-style)
- `ruff.flake8-quotes` → [`ruff.lint.flake8-quotes`](https://docs.astral.sh//ruff/settings/#lint_flake8-quotes)
- `ruff.flake8-self` → [`ruff.lint.flake8-self`](https://docs.astral.sh//ruff/settings/#lint_flake8-self)
- `ruff.flake8-tidy-imports` → [`ruff.lint.flake8-tidy-imports`](https://docs.astral.sh//ruff/settings/#lint_flake8-tidy-imports)
- `ruff.flake8-type-checking` → [`ruff.lint.flake8-type-checking`](https://docs.astral.sh//ruff/settings/#lint_flake8-type-checking)
- `ruff.flake8-unused-arguments` → [`ruff.lint.flake8-unused-arguments`](https://docs.astral.sh//ruff/settings/#lint_flake8-unused-arguments)
- `ruff.ignore` → [`ruff.lint.ignore`](https://docs.astral.sh//ruff/settings/#lint_ignore)
- `ruff.ignore-init-module-imports` → [`ruff.lint.ignore-init-module-imports`](https://docs.astral.sh//ruff/settings/#lint_ignore-init-module-imports)
- `ruff.isort` → [`ruff.lint.isort`](https://docs.astral.sh//ruff/settings/#lint_isort)
- `ruff.logger-objects` → [`ruff.lint.logger-objects`](https://docs.astral.sh//ruff/settings/#lint_logger-objects)
- `ruff.mccabe` → [`ruff.lint.mccabe`](https://docs.astral.sh//ruff/settings/#lint_mccabe)
- `ruff.pep8-naming` → [`ruff.lint.pep8-naming`](https://docs.astral.sh//ruff/settings/#lint_pep8-naming)
- `ruff.per-file-ignores` → [`ruff.lint.per-file-ignores`](https://docs.astral.sh//ruff/settings/#lint_per-file-ignores)
- `ruff.pycodestyle` → [`ruff.lint.pycodestyle`](https://docs.astral.sh//ruff/settings/#lint_pycodestyle)
- `ruff.pydocstyle` → [`ruff.lint.pydocstyle`](https://docs.astral.sh//ruff/settings/#lint_pydocstyle)
- `ruff.pyflakes` → [`ruff.lint.pyflakes`](https://docs.astral.sh//ruff/settings/#lint_pyflakes)
- `ruff.pylint` → [`ruff.lint.pylint`](https://docs.astral.sh//ruff/settings/#lint_pylint)
- `ruff.pyupgrade` → [`ruff.lint.pyupgrade`](https://docs.astral.sh//ruff/settings/#lint_pyupgrade)
- `ruff.select` → [`ruff.lint.select`](https://docs.astral.sh//ruff/settings/#lint_select)
- `ruff.task-tags` → [`ruff.lint.task-tags`](https://docs.astral.sh//ruff/settings/#lint_task-tags)
- `ruff.typing-modules` → [`ruff.lint.typing-modules`](https://docs.astral.sh//ruff/settings/#lint_typing-modules)
- `ruff.unfixable` → [`ruff.lint.unfixable`](https://docs.astral.sh//ruff/settings/#lint_unfixable)

Remapped rules

The following rules have been remapped to new codes:

- [`raise-without-from-inside-except`](https://docs.astral.sh/ruff/rules/raise-without-from-inside-except/): `TRY200` to `B904`
- [`suspicious-eval-usage`](https://docs.astral.sh/ruff/rules/suspicious-eval-usage/): `PGH001` to `S307`
- [`logging-warn`](https://docs.astral.sh/ruff/rules/logging-warn/): `PGH002` to `G010`
- [`static-key-dict-comprehension`](https://docs.astral.sh/ruff/rules/static-key-dict-comprehension): `RUF011` to `B035`
- [`runtime-string-union`](https://docs.astral.sh/ruff/rules/runtime-string-union): `TCH006` to `TCH010`

Stabilizations

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

- [`trio-timeout-without-await`](https://docs.astral.sh/ruff/rules/trio-timeout-without-await) (`TRIO100`)
- [`trio-sync-call`](https://docs.astral.sh/ruff/rules/trio-sync-call) (`TRIO105`)
- [`trio-async-function-with-timeout`](https://docs.astral.sh/ruff/rules/trio-async-function-with-timeout) (`TRIO109`)
- [`trio-unneeded-sleep`](https://docs.astral.sh/ruff/rules/trio-unneeded-sleep) (`TRIO110`)
- [`trio-zero-sleep-call`](https://docs.astral.sh/ruff/rules/trio-zero-sleep-call) (`TRIO115`)
- [`unnecessary-escaped-quote`](https://docs.astral.sh/ruff/rules/unnecessary-escaped-quote) (`Q004`)
- [`enumerate-for-loop`](https://docs.astral.sh/ruff/rules/enumerate-for-loop) (`SIM113`)
- [`zip-dict-keys-and-values`](https://docs.astral.sh/ruff/rules/zip-dict-keys-and-values) (`SIM911`)
- [`timeout-error-alias`](https://docs.astral.sh/ruff/rules/timeout-error-alias) (`UP041`)
- [`flask-debug-true`](https://docs.astral.sh/ruff/rules/flask-debug-true) (`S201`)
- [`tarfile-unsafe-members`](https://docs.astral.sh/ruff/rules/tarfile-unsafe-members) (`S202`)
- [`ssl-insecure-version`](https://docs.astral.sh/ruff/rules/ssl-insecure-version) (`S502`)
- [`ssl-with-bad-defaults`](https://docs.astral.sh/ruff/rules/ssl-with-bad-defaults) (`S503`)
- [`ssl-with-no-version`](https://docs.astral.sh/ruff/rules/ssl-with-no-version) (`S504`)
- [`weak-cryptographic-key`](https://docs.astral.sh/ruff/rules/weak-cryptographic-key) (`S505`)
- [`ssh-no-host-key-verification`](https://docs.astral.sh/ruff/rules/ssh-no-host-key-verification) (`S507`)
- [`django-raw-sql`](https://docs.astral.sh/ruff/rules/django-raw-sql) (`S611`)
- [`mako-templates`](https://docs.astral.sh/ruff/rules/mako-templates) (`S702`)
- [`generator-return-from-iter-method`](https://docs.astral.sh/ruff/rules/generator-return-from-iter-method) (`PYI058`)
- [`runtime-string-union`](https://docs.astral.sh/ruff/rules/runtime-string-union) (`TCH006`)
- [`numpy2-deprecation`](https://docs.astral.sh/ruff/rules/numpy2-deprecation) (`NPY201`)
- [`quadratic-list-summation`](https://docs.astral.sh/ruff/rules/quadratic-list-summation) (`RUF017`)
- [`assignment-in-assert`](https://docs.astral.sh/ruff/rules/assignment-in-assert) (`RUF018`)
- [`unnecessary-key-check`](https://docs.astral.sh/ruff/rules/unnecessary-key-check) (`RUF019`)
- [`never-union`](https://docs.astral.sh/ruff/rules/never-union) (`RUF020`)
- [`direct-logger-instantiation`](https://docs.astral.sh/ruff/rules/direct-logger-instantiation) (`LOG001`)
- [`invalid-get-logger-argument`](https://docs.astral.sh/ruff/rules/invalid-get-logger-argument) (`LOG002`)
- [`exception-without-exc-info`](https://docs.astral.sh/ruff/rules/exception-without-exc-info) (`LOG007`)
- [`undocumented-warn`](https://docs.astral.sh/ruff/rules/undocumented-warn) (`LOG009`)

Fixes for the following rules have been stabilized and are now available without preview:

- [`triple-single-quotes`](https://docs.astral.sh/ruff/rules/triple-single-quotes) (`D300`)
- [`non-pep604-annotation`](https://docs.astral.sh/ruff/rules/non-pep604-annotation) (`UP007`)
- [`dict-get-with-none-default`](https://docs.astral.sh/ruff/rules/dict-get-with-none-default) (`SIM910`)
- [`in-dict-keys`](https://docs.astral.sh/ruff/rules/in-dict-keys) (`SIM118`)
- [`collapsible-else-if`](https://docs.astral.sh/ruff/rules/collapsible-else-if) (`PLR5501`)
- [`if-with-same-arms`](https://docs.astral.sh/ruff/rules/if-with-same-arms) (`SIM114`)
- [`useless-else-on-loop`](https://docs.astral.sh/ruff/rules/useless-else-on-loop) (`PLW0120`)
- [`unnecessary-literal-union`](https://docs.astral.sh/ruff/rules/unnecessary-literal-union) (`PYI030`)
- [`unnecessary-spread`](https://docs.astral.sh/ruff/rules/unnecessary-spread) (`PIE800`)
- [`error-instead-of-exception`](https://docs.astral.sh/ruff/rules/error-instead-of-exception) (`TRY400`)
- [`redefined-while-unused`](https://docs.astral.sh/ruff/rules/redefined-while-unused) (`F811`)
- [`duplicate-value`](https://docs.astral.sh/ruff/rules/duplicate-value) (`B033`)
- [`multiple-imports-on-one-line`](https://docs.astral.sh/ruff/rules/multiple-imports-on-one-line) (`E401`)
- [`non-pep585-annotation`](https://docs.astral.sh/ruff/rules/non-pep585-annotation) (`UP006`)

Fixes for the following rules have been promoted from unsafe to safe:

- [`unaliased-collections-abc-set-import`](https://docs.astral.sh/ruff/rules/unaliased-collections-abc-set-import) (`PYI025`)

The following behaviors have been stabilized:

- [`module-import-not-at-top-of-file`](https://docs.astral.sh/ruff/rules/module-import-not-at-top-of-file/) (`E402`) allows `sys.path` modifications between imports
- [`reimplemented-container-builtin`](https://docs.astral.sh/ruff/rules/reimplemented-container-builtin/) (`PIE807`) includes lambdas that can be replaced with `dict`
- [`unnecessary-placeholder`](https://docs.astral.sh/ruff/rules/unnecessary-placeholder/) (`PIE790`) applies to unnecessary ellipses (`...`)
- [`if-else-block-instead-of-dict-get`](https://docs.astral.sh/ruff/rules/if-else-block-instead-of-dict-get/) (`SIM401`) applies to `if-else` expressions

Preview features

- \[`refurb`\] Implement `metaclass_abcmeta` (`FURB180`) ([9658](https://github.com/astral-sh/ruff/pull/9658))
- Implement `blank_line_after_nested_stub_class` preview style ([9155](https://github.com/astral-sh/ruff/pull/9155))
- The preview rule [`and-or-ternary`](https://docs.astral.sh/ruff/rules/and-or-ternary) (`PLR1706`) was removed

Bug fixes

- \[`flake8-async`\] Take `pathlib.Path` into account when analyzing async functions ([9703](https://github.com/astral-sh/ruff/pull/9703))
- \[`flake8-return`\] - fix indentation syntax error (`RET505`) ([9705](https://github.com/astral-sh/ruff/pull/9705))
- Detect multi-statement lines in else removal ([9748](https://github.com/astral-sh/ruff/pull/9748))
- `RUF022`, `RUF023`: never add two trailing commas to the end of a sequence ([9698](https://github.com/astral-sh/ruff/pull/9698))
- `RUF023`: Don't sort `__match_args__`, only `__slots__` ([9724](https://github.com/astral-sh/ruff/pull/9724))
- \[`flake8-simplify`\] - Fix syntax error in autofix (`SIM114`) ([9704](https://github.com/astral-sh/ruff/pull/9704))
- \[`pylint`\] Show verbatim constant in `magic-value-comparison` (`PLR2004`) ([9694](https://github.com/astral-sh/ruff/pull/9694))
- Removing trailing whitespace inside multiline strings is unsafe ([9744](https://github.com/astral-sh/ruff/pull/9744))
- Support `IfExp` with dual string arms in `invalid-envvar-default` ([9734](https://github.com/astral-sh/ruff/pull/9734))
- \[`pylint`\] Add `__mro_entries__` to known dunder methods (`PLW3201`) ([9706](https://github.com/astral-sh/ruff/pull/9706))

Documentation

- Removed rules are now retained in the documentation ([9691](https://github.com/astral-sh/ruff/pull/9691))
- Deprecated rules are now indicated in the documentation ([9689](https://github.com/astral-sh/ruff/pull/9689))

Preview features

- Error when `NURSERY` selector is used with `--preview` ([9682](https://github.com/astral-sh/ruff/pull/9682))
- Preserve indentation around multiline strings in formatter ([9637](https://github.com/astral-sh/ruff/pull/9637))
- \[`flake8-return`\] Add fixes for all rules (`RET505`, `RET506`, `RET507`, `RET508`) ([9595](https://github.com/astral-sh/ruff/pull/9595))
- \[`flake8-simplify`\] Add fix for `if-with-same-arms` (`SIM114`) ([9591](https://github.com/astral-sh/ruff/pull/9591))
- \[`pycodestyle`\] Add fix for `multiple-imports-on-one-line` (`E401`) ([9518](https://github.com/astral-sh/ruff/pull/9518))
- \[`pylint`\] Add fix for `collapsible-else-if` (`PLR5501`) ([9594](https://github.com/astral-sh/ruff/pull/9594))
- \[`pylint`\] Add fix for `useless-else-on-loop` (`PLW0120`) ([9590](https://github.com/astral-sh/ruff/pull/9590))
- \[`pylint`\] Implement `assigning-non-slot` (`E0237`) ([9623](https://github.com/astral-sh/ruff/pull/9623))
- \[`pylint`\] Implement `potential-index-error` (`PLE0643`) ([9545](https://github.com/astral-sh/ruff/pull/9545))
- \[`pylint`\] Implement `too-many-nested-blocks` (`PLR1702`) ([9172](https://github.com/astral-sh/ruff/pull/9172))
- \[`ruff`\] Add rule to sort `__slots__` and `__match_args__` ([9564](https://github.com/astral-sh/ruff/pull/9564))
- \[`ruff`\] Detect unnecessary `dict` comprehensions for iterables (`RUF025`) ([9613](https://github.com/astral-sh/ruff/pull/9613))
- \[`ruff`\] Guard against use of `default_factory` as a keyword argument (`RUF026`) ([9651](https://github.com/astral-sh/ruff/pull/9651))
- \[`ruff`\] Implement `mutable-fromkeys-value` (`RUF024`) ([9597](https://github.com/astral-sh/ruff/pull/9597))

CLI

- Enable auto-wrapping of `--help` output ([9633](https://github.com/astral-sh/ruff/pull/9633))

Bug fixes

- Avoid rendering display-only rules as fixable ([9649](https://github.com/astral-sh/ruff/pull/9649))
- Detect automagic-like assignments in notebooks ([9653](https://github.com/astral-sh/ruff/pull/9653))
- Generate custom JSON schema for dynamic setting ([9632](https://github.com/astral-sh/ruff/pull/9632))
- \[`flake8-no-pep420`\] Include global `--config` when determining namespace packages ([9603](https://github.com/astral-sh/ruff/pull/9603))
- \[`flake8-pie`\] Omit bound tuples passed to `.startswith` or `.endswith` ([9661](https://github.com/astral-sh/ruff/pull/9661))
- \[`flake8-return`\] Avoid panic when fixing inlined else blocks ([9657](https://github.com/astral-sh/ruff/pull/9657))
- \[`flake8-return`\] Consider exception suppression in unnecessary assignment ([9673](https://github.com/astral-sh/ruff/pull/9673))
- \[`flake8-return`\] Take `NoReturn` annotation into account when analyzing implicit returns ([9636](https://github.com/astral-sh/ruff/pull/9636))
- \[`flake8-simplify`\] Support inverted returns in `needless-bool` (`SIM103`) ([9619](https://github.com/astral-sh/ruff/pull/9619))
- \[`flake8-type-checking`\] Add Pydantic's `BaseConfig` to default-copy list ([9650](https://github.com/astral-sh/ruff/pull/9650))
- \[`flake8-type-checking`\] Avoid marking `InitVar` as a typing-only annotation ([9688](https://github.com/astral-sh/ruff/pull/9688))
- \[`pycodestyle`\] Allow `dtype` comparisons in `type-comparison` ([9676](https://github.com/astral-sh/ruff/pull/9676))
- \[`pydocstyle`\] Re-implement `last-line-after-section` (`D413`) ([9654](https://github.com/astral-sh/ruff/pull/9654))

Documentation

- \[`flake8-pytest-style`\] Add fix safety documentation for `duplicate-parameterize-test-cases` ([9678](https://github.com/astral-sh/ruff/pull/9678))
- \[`pylint`\] Document `literal-membership` fix safety conditions ([9677](https://github.com/astral-sh/ruff/pull/9677))
- \[`isort`\] Fix reference to `isort` rule code ([9598](https://github.com/astral-sh/ruff/pull/9598))

Preview features

- \[`flake8-bugbear`\] Add fix for `duplicate-value` (`B033`) ([9510](https://github.com/astral-sh/ruff/pull/9510))
- \[`flake8-simplify`\] Implement `enumerate-for-loop` (`SIM113`) ([7777](https://github.com/astral-sh/ruff/pull/7777))
- \[`pygrep_hooks`\] Add fix for `deprecated-log-warn` (`PGH002`) ([9519](https://github.com/astral-sh/ruff/pull/9519))
- \[`pylint`\] Implement `import-private-name` (`C2701`) ([5920](https://github.com/astral-sh/ruff/pull/5920))
- \[`refurb`\] Implement `regex-flag-alias` with fix (`FURB167`) ([9516](https://github.com/astral-sh/ruff/pull/9516))
- \[`ruff`\] Add rule and fix to sort contents of `__all__` (`RUF022`) ([9474](https://github.com/astral-sh/ruff/pull/9474))
- \[`tryceratops`\] Add fix for `error-instead-of-exception` (`TRY400`) ([9520](https://github.com/astral-sh/ruff/pull/9520))

Rule changes

- \[`flake8-pyi`\] Fix `PYI047` false negatives on PEP-695 type aliases ([9566](https://github.com/astral-sh/ruff/pull/9566))
- \[`flake8-pyi`\] Fix `PYI049` false negatives on call-based `TypedDict`s ([9567](https://github.com/astral-sh/ruff/pull/9567))
- \[`pylint`\] Exclude `self` and `cls` when counting method arguments (`PLR0917`) ([9563](https://github.com/astral-sh/ruff/pull/9563))

CLI

- `--show-settings` displays active settings in a far more readable format ([9464](https://github.com/astral-sh/ruff/pull/9464))
- Add `--extension` support to the formatter ([9483](https://github.com/astral-sh/ruff/pull/9483))

Configuration

- Ignore preview status for fixable and unfixable selectors ([9538](https://github.com/astral-sh/ruff/pull/9538))
- \[`pycodestyle`\] Use the configured tab size when expanding indents ([9506](https://github.com/astral-sh/ruff/pull/9506))

Bug fixes

- Recursively visit deferred AST nodes ([9541](https://github.com/astral-sh/ruff/pull/9541))
- Visit deferred lambdas before type definitions ([9540](https://github.com/astral-sh/ruff/pull/9540))
- \[`flake8-simplify`\] Avoid some more `enumerate-for-loop` false positives (`SIM113`) ([9515](https://github.com/astral-sh/ruff/pull/9515))
- \[`pandas-vet`\] Limit inplace diagnostics to methods that accept inplace ([9495](https://github.com/astral-sh/ruff/pull/9495))
- \[`pylint`\] Add the `__prepare__` method to the list of recognized dunder method ([9529](https://github.com/astral-sh/ruff/pull/9529))
- \[`pylint`\] Ignore unnecessary dunder calls within dunder definitions ([9496](https://github.com/astral-sh/ruff/pull/9496))
- \[`refurb`\] Avoid bailing when `reimplemented-operator` is called on function (`FURB118`) ([9556](https://github.com/astral-sh/ruff/pull/9556))
- \[`ruff`\] Avoid treating named expressions as static keys (`RUF011`) ([9494](https://github.com/astral-sh/ruff/pull/9494))

Documentation

- Add instructions on using `noqa` with isort rules ([9555](https://github.com/astral-sh/ruff/pull/9555))
- Documentation update for URL giving 'page not found' ([9565](https://github.com/astral-sh/ruff/pull/9565))
- Fix admonition in dark mode ([9502](https://github.com/astral-sh/ruff/pull/9502))
- Update contributing docs to use `cargo bench -p ruff_benchmark` ([9535](https://github.com/astral-sh/ruff/pull/9535))
- Update emacs integration section to include `emacs-ruff-format` ([9403](https://github.com/astral-sh/ruff/pull/9403))
- \[`flake8-blind-except`\] Document exceptions to `blind-except` rule ([9580](https://github.com/astral-sh/ruff/pull/9580))

Bug fixes

- Include base pyproject when initializing cache settings ([9480](https://github.com/astral-sh/ruff/pull/9480))
- \[`flake8-simplify`\] Account for possibly-empty f-string values in truthiness logic ([9484](https://github.com/astral-sh/ruff/pull/9484))
- \[`pylint`\] Add the missing period in `unnecessary-dunder-call` ([9485](https://github.com/astral-sh/ruff/pull/9485))
- \[`pylint`\] Fix `__aenter__` message in `unnecessary-dunder-call` ([9492](https://github.com/astral-sh/ruff/pull/9492))