Sandbox::https://redirect.github.com/astral-sh/ruff/pull/27877

ntBre · 2026-08-19T13:36:39Z

Summary

These are the last five commits from #27666 that update the preview default selectors based on the new categorization:

add current preview rules to the default selectors
add third-party rules to the default selectors
add preview rules stabilized in 0.15 to the default selectors (oops)
incorporate the DTZ and F406 changes from Feedback on new default rules #27213
adjust 4 categories that genuinely differ between my previous and current categorizations

Test Plan

Updated default rules snapshot

astral-sh-bot · 2026-08-19T13:44:30Z

`ruff-ecosystem` results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+1245 -125 violations, +0 -0 fixes in 14 projects; 45 projects unchanged)

aiven/aiven-client (+13 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ aiven/client/argx.py:199:14: subclass-builtin Subclassing `dict` can be error prone, use `collections.UserDict` instead
+ aiven/client/argx.py:74:22: if-exp-instead-of-or-operator [*] Replace ternary `if` expression with `or` operator
+ aiven/client/cli.py:4501:46: unnecessary-dict-comprehension-for-iterable [*] Unnecessary dict comprehension for iterable; use `dict.fromkeys` instead
+ aiven/client/cli.py:6654:34: unnecessary-dict-comprehension-for-iterable [*] Unnecessary dict comprehension for iterable; use `dict.fromkeys` instead
+ aiven/client/cli.py:6765:34: unnecessary-dict-comprehension-for-iterable [*] Unnecessary dict comprehension for iterable; use `dict.fromkeys` instead
+ aiven/client/client.py:142:54: if-exp-instead-of-or-operator [*] Replace ternary `if` expression with `or` operator
+ aiven/client/client.py:856:20: if-exp-instead-of-or-operator [*] Replace ternary `if` expression with `or` operator
+ aiven/client/client.py:880:20: if-exp-instead-of-or-operator [*] Replace ternary `if` expression with `or` operator
+ aiven/client/connection_info/_utils.py:47:13: repeated-append Use `bits.extend((":", urllib.parse.quote(password)))` instead of repeatedly calling `bits.append()`
+ tests/test_cli.py:1505:5: pytest-raises-with-multiple-statements `pytest.raises()` block should contain a single simple statement
... 3 additional changes omitted for project

PlasmaPy/PlasmaPy (+26 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ docs/_author_list_from_cff.py:97:9: missing-f-string-syntax Possible f-string without an `f` prefix
+ docs/notebooks/formulary/ExB_drift.ipynb:cell 15:3:24: missing-f-string-syntax Possible f-string without an `f` prefix
+ docs/notebooks/formulary/ExB_drift.ipynb:cell 15:4:30: missing-f-string-syntax Possible f-string without an `f` prefix
+ src/plasmapy/analysis/fit_functions.py:584:12: float-equality-comparison Unreliable floating point equality comparison `m == 0.0`
+ src/plasmapy/analysis/swept_langmuir/floating_potential.py:243:17: float-equality-comparison Unreliable floating point equality comparison `current == 0.0`
+ src/plasmapy/formulary/quantum.py:123:10: float-equality-comparison Unreliable floating point equality comparison `0 * u.m / u.s == V`
+ src/plasmapy/plasma/grids.py:1373:26: float-equality-comparison Unreliable floating point equality comparison `norms == 0.0`
+ tests/analysis/test_fit_functions.py:534:16: float-equality-comparison Unreliable floating point equality comparison `root == np.log(5.0 / 3.0) / 0.5`
+ tests/formulary/test_fusion.py:326:16: float-equality-comparison Unreliable floating point equality comparison `sigma.unit == u.m**3 / u.s`
... 17 additional changes omitted for rule float-equality-comparison
+ tests/formulary/test_quantum.py:122:9: missing-f-string-syntax Possible f-string without an `f` prefix
... 16 additional changes omitted for project

docker/docker-py (+47 -5 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ docker/api/build.py:20:9: escape-sequence-in-docstring Use `r"""` if any backslashes in a docstring
+ docker/api/client.py:472:35: float-equality-comparison Unreliable floating point equality comparison `timeout == 0.0`
+ docker/auth.py:75:18: subclass-builtin Subclassing `dict` can be error prone, use `collections.UserDict` instead
+ docker/context/context.py:76:16: unnecessary-dunder-call Unnecessary dunder call to `__call__`
+ docker/models/containers.py:537:9: escape-sequence-in-docstring Use `r"""` if any backslashes in a docstring
+ docker/types/base.py:1:16: subclass-builtin Subclassing `dict` can be error prone, use `collections.UserDict` instead
+ docker/types/containers.py:264:18: subclass-builtin Subclassing `dict` can be error prone, use `collections.UserDict` instead
+ docker/types/containers.py:688:23: subclass-builtin Subclassing `dict` can be error prone, use `collections.UserDict` instead
+ docker/types/networks.py:54:24: subclass-builtin Subclassing `dict` can be error prone, use `collections.UserDict` instead
+ docker/types/networks.py:5:22: subclass-builtin Subclassing `dict` can be error prone, use `collections.UserDict` instead
... 22 additional changes omitted for rule subclass-builtin
... 42 additional changes omitted for project

facebookresearch/chameleon (+5 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ chameleon/inference/chameleon.py:387:26: slice-copy [*] Prefer `copy` method over slicing
+ chameleon/inference/stopping_criteria.py:16:28: subclass-builtin Subclassing `list` can be error prone, use `collections.UserList` instead
+ chameleon/inference/vqgan.py:92:32: float-equality-comparison Unreliable floating point equality comparison `temp == 1.0`
+ chameleon/viewer/backend/models/chameleon_distributed.py:394:17: logging-eager-conversion Unnecessary `str()` conversion when formatting with `%s`
+ chameleon/viewer/backend/models/chameleon_distributed.py:475:17: logging-eager-conversion Unnecessary `str()` conversion when formatting with `%s`

ing-bank/probatus (+6 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ probatus/feature_elimination/feature_elimination.py:1006:40: unnecessary-dict-comprehension-for-iterable [*] Unnecessary dict comprehension for iterable; use `dict.fromkeys` instead
+ probatus/utils/arrayfuncs.py:96:42: pandas-use-of-dot-is-null `.isna` is preferred to `.isnull`; functionality is equivalent
+ probatus/utils/shap_helpers.py:83:13: needless-else [*] Empty `else` clause
+ tests/feature_elimination/test_feature_elimination.py:135:5: pytest-raises-with-multiple-statements `pytest.raises()` block should contain a single simple statement
+ tests/sample_similarity/test_resemblance_model.py:213:12: float-equality-comparison Unreliable floating point equality comparison `train_score == 0.5`
+ tests/sample_similarity/test_resemblance_model.py:214:12: float-equality-comparison Unreliable floating point equality comparison `test_score == 0.5`

prefecthq/prefect (+746 -102 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ benches/bench_count_flow_runs.py:190:12: blocking-path-method-in-async-function Async functions should not use os.path methods, use trio.Path or anyio.path
+ benches/bench_count_flow_runs.py:1:1: escape-sequence-in-docstring Use `r"""` if any backslashes in a docstring
+ benches/bench_import.py:1:1: escape-sequence-in-docstring Use `r"""` if any backslashes in a docstring
+ client/client_deploy.py:32:20: blocking-path-method-in-async-function Async functions should not use pathlib.Path methods, use trio.Path or anyio.path
+ docs/conftest.py:61:12: unnecessary-dict-comprehension-for-iterable [*] Unnecessary dict comprehension for iterable; use `dict.fromkeys` instead
+ examples/simple_web_scraper.py:103:19: if-exp-instead-of-or-operator [*] Replace ternary `if` expression with `or` operator
+ integration-tests/test_nested_cancellation.py:120:12: blocking-path-method-in-async-function Async functions should not use pathlib.Path methods, use trio.Path or anyio.path
+ integration-tests/test_nested_cancellation.py:53:5: blocking-path-method-in-async-function Async functions should not use pathlib.Path methods, use trio.Path or anyio.path
+ integration-tests/test_nested_cancellation.py:64:5: blocking-path-method-in-async-function Async functions should not use pathlib.Path methods, use trio.Path or anyio.path
+ integration-tests/test_nested_cancellation.py:69:9: blocking-path-method-in-async-function Async functions should not use pathlib.Path methods, use trio.Path or anyio.path
... 84 additional changes omitted for rule blocking-path-method-in-async-function
+ scripts/backfill_release_notes.py:139:20: unnecessary-enumerate `enumerate` index is unused, use `for x in y` instead
+ scripts/backfill_release_notes.py:228:13: repeated-append Use `filtered_lines.extend((f"**{header_text}**", ""))` instead of repeatedly calling `filtered_lines.append()`
+ scripts/backfill_release_notes.py:240:13: repeated-append Use `filtered_lines.extend((f"**{header_text}**", ""))` instead of repeatedly calling `filtered_lines.append()`
- scripts/backfill_release_notes.py:319:20: call-datetime-strptime-without-zone Naive datetime constructed using `datetime.datetime.strptime()` without %z
+ scripts/generate-lower-bounds.py:2:1: escape-sequence-in-docstring Use `r"""` if any backslashes in a docstring
+ scripts/generate_settings_ref.py:10:40: missing-maxsplit-arg [*] String is split more times than necessary
+ scripts/generate_settings_ref.py:117:9: repeated-append Use `docs.extend(...)` instead of repeatedly calling `docs.append()`
+ scripts/prepare_integration_release_notes.py:240:23: missing-maxsplit-arg [*] String is split more times than necessary
- scripts/prepare_integration_release_notes.py:246:53: call-datetime-now-without-tzinfo `datetime.datetime.now()` called without a `tz` argument
- scripts/prepare_integration_release_notes.py:250:36: call-datetime-now-without-tzinfo `datetime.datetime.now()` called without a `tz` argument
+ scripts/prepare_integration_release_notes.py:255:13: repeated-append Use `notes.extend((f"**{category}**", ""))` instead of repeatedly calling `notes.append()`
- scripts/prepare_release_notes.py:113:12: call-datetime-now-without-tzinfo `datetime.datetime.now()` called without a `tz` argument
+ scripts/prepare_release_notes.py:147:20: unnecessary-enumerate `enumerate` index is unused, use `for x in y` instead
+ scripts/prepare_release_notes.py:236:13: repeated-append Use `filtered_lines.extend((f"**{header_text}**", ""))` instead of repeatedly calling `filtered_lines.append()`
+ scripts/prepare_release_notes.py:248:13: repeated-append Use `filtered_lines.extend((f"**{header_text}**", ""))` instead of repeatedly calling `filtered_lines.append()`
... 23 additional changes omitted for rule repeated-append
- scripts/prepare_release_notes.py:337:20: call-datetime-strptime-without-zone Naive datetime constructed using `datetime.datetime.strptime()` without %z
+ scripts/verify_test_selection.py:81:5: reimplemented-builtin Use `return all(not fnmatch.fnmatch(filepath, pattern) for pattern in ignore_globs)` instead of `for` loop
+ src/integrations/prefect-aws/prefect_aws/_cli/utils.py:198:20: single-item-membership-test Membership test against single-item container
+ src/integrations/prefect-aws/prefect_aws/observers/ecs.py:589:15: missing-maxsplit-arg [*] String is split more times than necessary
+ src/integrations/prefect-aws/prefect_aws/workers/ecs_worker.py:758:14: if-exp-instead-of-or-operator [*] Replace ternary `if` expression with `or` operator
... 818 additional changes omitted for project

pypa/cibuildwheel (+1 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

+ cibuildwheel/environment.py:24:5: escape-sequence-in-docstring Use `r"""` if any backslashes in a docstring

pypa/setuptools (+32 -5 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --no-fix --output-format concise --preview

- setuptools/build_meta.py:317:35: noqa-comments [*] `noqa` comment used instead of `ruff: ignore`
+ setuptools/build_meta.py:317:35: unused-noqa [*] Unused `noqa` directive (non-enabled: `S102`)
+ setuptools/command/bdist_wheel.py:112:15: missing-maxsplit-arg [*] String is split more times than necessary
+ setuptools/config/expand.py:116:5: escape-sequence-in-docstring Use `r"""` if any backslashes in a docstring
+ setuptools/depends.py:116:10: none-not-at-end-of-union [*] `None` not at the end of the type union.
+ setuptools/depends.py:146:10: none-not-at-end-of-union [*] `None` not at the end of the type union.
+ setuptools/depends.py:60:10: none-not-at-end-of-union [*] `None` not at the end of the type union.
+ setuptools/dist.py:605:13: unnecessary-dunder-call Unnecessary dunder call to `__init__`. Instantiate class directly.
- setuptools/launch.py:32:28: noqa-comments [*] `noqa` comment used instead of `ruff: ignore`
+ setuptools/launch.py:32:28: unused-noqa [*] Unused `noqa` directive (non-enabled: `S102`)
... 27 additional changes omitted for project

... Truncated remaining completed project reports due to GitHub comment length restrictions

Changes by rule (45 rules affected)

code	total	+ violation	- violation
pytest-raises-with-multiple-statements	232	232	0
float-equality-comparison	148	148	0
pytest-raises-ambiguous-pattern	143	143	0
numpy-legacy-random	97	97	0
blocking-path-method-in-async-function	89	89	0
unnecessary-dunder-call	75	75	0
call-datetime-without-tzinfo	74	0	74
if-exp-instead-of-or-operator	59	59	0
missing-f-string-syntax	39	39	0
subclass-builtin	38	38	0
unnecessary-lambda	38	38	0
legacy-form-pytest-raises	36	36	0
repeated-append	33	33	0
call-datetime-now-without-tzinfo	27	0	27
slice-copy	26	26	0
none-not-at-end-of-union	23	23	0
unnecessary-dict-comprehension-for-iterable	21	21	0
escape-sequence-in-docstring	15	15	0
math-constant	15	15	0
missing-maxsplit-arg	11	11	0
fallible-context-manager	10	10	0
for-loop-set-mutations	10	10	0
logging-eager-conversion	9	9	0
pytest-patch-with-lambda	9	9	0
exec-builtin	9	0	9
meta-class-abc-meta	8	8	0
reimplemented-builtin	7	7	0
single-item-membership-test	7	7	0
useless-finally	7	7	0
unused-noqa	7	7	0
noqa-comments	7	0	7
needless-else	6	6	0
unnecessary-enumerate	6	6	0
return-in-generator	5	5	0
hardcoded-string-charset	5	5	0
call-datetime-strptime-without-zone	5	0	5
redundant-bool-literal	3	3	0
falsy-dict-get-fallback	2	2	0
fast-api-non-annotated-dependency	2	2	0
call-date-today	2	0	2
pandas-use-of-dot-is-null	1	1	0
abstract-base-class-without-abstract-method	1	1	0
empty-method-without-abstract-decorator	1	1	0
implicit-class-var-in-dataclass	1	1	0
call-datetime-fromtimestamp	1	0	1

MichaReiser · 2026-08-26T08:24:28Z

 /// [F841]: https://docs.astral.sh/ruff/rules/unused-variable/
 #[derive(ViolationMetadata)]
-#[violation_metadata(stable_since = "0.13.0", category = Category::Correctness)]
+#[violation_metadata(stable_since = "0.13.0", category = Category::Suspicious)]


Was this based on the previous discussion when we split out the rule from unused variable?

Yes: #8884. Alex even called it "stylistic," so we could go lower if you want. I'd personally still consider it a correctness issue like unused-variable, but the _ dummy variable convention doesn't seem widely accepted enough in Python, at least based on our ecosystem results.

Co-authored-by: Brent Westbrook <36778786+ntBre@users.noreply.github.com>

…p.rs

## Summary These are the last five commits from #27666 that update the preview default selectors based on the new categorization: - add current preview rules to the default selectors - add third-party rules to the default selectors - add preview rules stabilized in 0.15 to the default selectors (oops) - incorporate the DTZ and F406 changes from #27213 - adjust 4 categories that genuinely differ between my previous and current categorizations ## Test Plan Updated default rules snapshot

ntBre added preview Related to preview-mode features rule-selection Related to enabling or disabling rules labels Aug 19, 2026

ntBre mentioned this pull request Aug 19, 2026

Introduce category selectors #27666

Merged

ntBre commented Aug 19, 2026

View reviewed changes

Comment thread crates/ruff_linter/src/rules/airflow/rules/suggested_to_move_to_provider_in_3.rs Resolved

ntBre commented Aug 19, 2026

View reviewed changes

Comment thread crates/ruff_linter/src/rules/airflow/rules/removal_in_3.rs Resolved

ntBre force-pushed the brent/update-preview-category-defaults branch 2 times, most recently from af972d1 to e5074e2 Compare August 19, 2026 20:21

ntBre changed the base branch from brent/category-selectors to brent/category-docs August 19, 2026 20:23

ntBre changed the base branch from brent/category-docs to brent/rule-acceptance-guidelines August 19, 2026 22:39

ntBre force-pushed the brent/update-preview-category-defaults branch from e5074e2 to 7f26ad4 Compare August 20, 2026 13:56

ntBre force-pushed the brent/update-preview-category-defaults branch 2 times, most recently from af813a2 to c87c347 Compare August 20, 2026 14:55

ntBre force-pushed the brent/update-preview-category-defaults branch 2 times, most recently from a1b5d00 to 1e0e0a3 Compare August 20, 2026 19:01

ntBre force-pushed the brent/update-preview-category-defaults branch from 1e0e0a3 to e0ba694 Compare August 21, 2026 17:12

ntBre force-pushed the brent/update-preview-category-defaults branch from e0ba694 to 3e8471a Compare August 21, 2026 17:45

ntBre force-pushed the brent/update-preview-category-defaults branch from 3e8471a to cd035c5 Compare August 21, 2026 19:21

ntBre force-pushed the brent/update-preview-category-defaults branch 3 times, most recently from cec6e47 to e5252dc Compare August 24, 2026 14:01

ntBre force-pushed the brent/update-preview-category-defaults branch from e5252dc to e5d5674 Compare August 25, 2026 18:51

ntBre marked this pull request as ready for review August 25, 2026 19:20

ntBre force-pushed the brent/update-preview-category-defaults branch from e5d5674 to 458df37 Compare August 25, 2026 21:05

MichaReiser approved these changes Aug 26, 2026

View reviewed changes

ntBre force-pushed the brent/update-preview-category-defaults branch from 458df37 to c221ce5 Compare August 26, 2026 18:57

ntBre force-pushed the brent/update-preview-category-defaults branch from f9aafcb to eb0752a Compare August 26, 2026 22:48

ntBre and others added 8 commits August 27, 2026 09:17

Add preview rules to preview defaults

2c1dcfc

Add third-party rules to preview defaults

2c38538

Add formerly preview rules to preview defaults

c3495cb

Adjust preview defaults based on default-rule feedback

424bf24

Adjust recategorized rules in preview defaults

efad90c

Apply suggestions from code review

bff8564

Co-authored-by: Brent Westbrook <36778786+ntBre@users.noreply.github.com>

update snapshot

9c03b0a

Update crates/ruff_linter/src/rules/flake8_simplify/rules/ast_unary_o…

8e03ca8

…p.rs

ntBre force-pushed the brent/update-preview-category-defaults branch from 97de6bc to 8e03ca8 Compare August 27, 2026 13:20

ntBre merged commit 5fdab73 into main Aug 27, 2026
65 checks passed

ntBre deleted the brent/update-preview-category-defaults branch August 27, 2026 15:26

BrewTestBot mentioned this pull request Aug 27, 2026

ruff 0.16.5 Homebrew/homebrew-core#301006

Merged

ntBre mentioned this pull request Aug 31, 2026

Old rules are now default in 0.16.5 #28190

Closed

scottames-github-bot Bot mentioned this pull request Sep 1, 2026

chore(deps): update ⬆️ mise-packages scottames/dots#1045

Merged

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Update preview default rules and categories - #27877

Update preview default rules and categories#27877
ntBre merged 8 commits into
brent/rule-acceptance-guidelinesfrom
brent/update-preview-category-defaults

ntBre commented Aug 19, 2026

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ntBre commented Aug 19, 2026

Summary

Test Plan

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ruff-ecosystem results

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MichaReiser Aug 26, 2026

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astral-sh-bot Bot commented Aug 19, 2026 •

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`ruff-ecosystem` results