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

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ntBre merged 2 commits intoastral-sh:mainfrom
Dev-iL:2602/airflow/runtime
Mar 9, 2026
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[airflow] Flag runtime-varying values in DAG/task constructor arguments (AIR304)#23631
ntBre merged 2 commits intoastral-sh:mainfrom
Dev-iL:2602/airflow/runtime

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@Dev-iL Dev-iL commented Feb 28, 2026

Summary

Add rule AIR304 that flags runtime-varying function calls (e.g., datetime.now(), pendulum.now(), random.randint(), uuid.uuid4()) used as arguments in Airflow DAG/task constructors. These calls cause the serialized DAG hash to change on every parse, creating infinite DAG versions in the dag_version and serialized_dag tables, leading to unbounded database growth and eventual OOM conditions.

Reference: apache/airflow#59430

The rule checks:

  • DAG(...) constructors and @dag(...) decorator calls
  • Operator and sensor constructors (via is_airflow_builtin_or_provider)
  • @task(...) decorator calls

It recursively inspects keyword argument values through binary/unary ops, dicts, lists, sets, tuples, and f-strings to find calls to known runtime-varying functions from datetime, pendulum, time, uuid, and random.

Test Plan

cargo test -p ruff_linter -- airflow::tests — all 43 tests pass, including the new AIR304 test case with 17 violation and 6 non-violation scenarios covering direct calls, binary ops, default_args dicts, f-strings, operators, sensors, decorators, and non-airflow calls.

Related: apache/airflow#43176
CC: @Lee-W @sjyangkevin @wjddn279

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astral-sh-bot bot commented Feb 28, 2026 •
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ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+97 -0 violations, +0 -0 fixes in 1 projects; 55 projects unchanged)

apache/airflow (+97 -0 violations, +0 -0 fixes) 

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

+ airflow-core/src/airflow/example_dags/example_params_ui_tutorial.py:89:16: AIR304 `date.today()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3116:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3161:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3172:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3197:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3215:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3230:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3258:64: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3326:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3335:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3347:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3370:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3394:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3420:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3439:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3450:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3481:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3510:63: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/models/test_dag.py:3524:60: AIR304 `pendulum.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/serialization/test_dag_serialization.py:1859:56: AIR304 `datetime.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/serialization/test_serialized_objects.py:254:52: AIR304 `datetime.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ airflow-core/tests/unit/serialization/test_serialized_objects.py:366:55: AIR304 `datetime.now()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1069:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1093:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1217:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1247:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1277:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1303:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1325:82: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1329:47: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1358:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1403:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:1469:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:183:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:200:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:219:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:236:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:251:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:268:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:289:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:311:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:332:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:352:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:374:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:393:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:415:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:494:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:517:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:550:29: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
+ kubernetes-tests/tests/kubernetes_tests/test_kubernetes_pod_operator.py:627:25: AIR304 `uuid.uuid4()` produces a value that changes at runtime; using it in a Dag or task argument causes infinite Dag version creation
... 47 additional changes omitted for project

Changes by rule (1 rules affected)

code total + violation - violation + fix - fix
AIR304 97 97 0 0 0

@ntBre ntBre added rule Implementing or modifying a lint rule preview Related to preview mode features labels Mar 2, 2026
@Dev-iL Dev-iL force-pushed the 2602/airflow/runtime branch from cfc0bce to 0a4d03a Compare March 3, 2026 20:17
Lee-W
Lee-W reviewed Mar 5, 2026
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a few nits, but looks good in general!

@Dev-iL Dev-iL force-pushed the 2602/airflow/runtime branch 2 times, most recently from 18756ae to 2e8e72c Compare March 5, 2026 08:17
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yep, looks good to me. @ntBre could you please take a look when you have a moment? thanks a lots!

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Thank you! This looks good to me. I just had one suggestion to compare to an existing helper method to see if there are any other cases you want to handle in find_runtime_varying_call.

Dev-iL and others added 2 commits March 8, 2026 17:17
@Dev-iL @claude
Add AIR304: flag runtime-varying values in DAG/task constructor args
08cef31 
Using runtime-varying values (like `datetime.now()`) as arguments to
Airflow DAG or task constructors causes the serialized DAG hash to change
on every parse, creating infinite DAG versions in the database. This rule
detects such calls in DAG constructors, @dag decorators, operator/sensor
constructors, and @task decorators, recursively checking through binary
ops, dicts, lists, sets, tuples, and f-strings.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
@Dev-iL
Standardize DAG/dag/Dag capitalization in AIR301 & AIR302 docs
c48870d
@Dev-iL Dev-iL force-pushed the 2602/airflow/runtime branch from 2e8e72c to c48870d Compare March 8, 2026 15:17
@ntBre ntBre changed the title [airflow] Flag runtime-varying values in DAG/task constructor arguments (AIR304) [airflow] Flag runtime-varying values in DAG/task constructor arguments (AIR304) Mar 9, 2026
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ntBre commented Mar 9, 2026

I guess one more quick question before landing: is this behavior specific to Airflow 3? I think so far we've used the AIR3 prefix for things that changed in Airflow 3, but it seems like this could affect other versions (to my naive understanding).

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Dev-iL commented Mar 9, 2026 •
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I guess one more quick question before landing: is this behavior specific to Airflow 3? I think so far we've used the AIR3 prefix for things that changed in Airflow 3, but it seems like this could affect other versions (to my naive understanding).

Good question! Yes, this only affects Airflow3. This is because Dag versioning was introduced in Airflow 3, so these patterns weren't problematic before.

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ntBre commented Mar 9, 2026

Sounds good, thank you! I'll land this then!

@ntBre ntBre merged commit b82853f into astral-sh:main Mar 9, 2026
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@Dev-iL Dev-iL deleted the 2602/airflow/runtime branch March 9, 2026 18:01
@BrewTestBot BrewTestBot mentioned this pull request Mar 12, 2026
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chore(deps): update dependency ruff to v0.15.7 (2024.6)
3383d17 
Released on 2026-03-19.

- Display output severity in preview ([#23845](astral-sh/ruff#23845))
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- \[`pycodestyle`] Recognize `pyrefly:` as a pragma comment (`E501`) ([#24019](astral-sh/ruff#24019))

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- Reject semantic syntax errors for lazy imports ([#23757](astral-sh/ruff#23757))
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- \[`airflow`] Flag `Variable.get()` calls outside of task execution context (`AIR003`) ([#23584](astral-sh/ruff#23584))
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- \[`flake8-bandit`] Don't flag `BaseLoader`/`CBaseLoader` as unsafe (`S506`) ([#23510](astral-sh/ruff#23510))

- Avoid infinite loop between `I002` and `PYI025` ([#23352](astral-sh/ruff#23352))
- \[`pyflakes`] Fix false positive for `@overload` from `lint.typing-modules` (`F811`) ([#23357](astral-sh/ruff#23357))
- \[`pyupgrade`] Fix false positive for `TypeVar` default before Python 3.12 (`UP046`) ([#23540](astral-sh/ruff#23540))
- \[`pyupgrade`] Fix handling of `\N` in raw strings (`UP032`) ([#22149](astral-sh/ruff#22149))

- Render sub-diagnostics in the GitHub output format ([#23455](astral-sh/ruff#23455))

- \[`flake8-bugbear`] Tag certain `B007` diagnostics as unnecessary ([#23453](astral-sh/ruff#23453))

- \[`ruff`] Ignore unknown rule codes in `RUF100` ([#23531](astral-sh/ruff#23531))

  These are now flagged by [`RUF102`](https://docs.astral.sh/ruff/rules/invalid-rule-code/) instead.

- Fix missing settings links for several linters ([#23519](astral-sh/ruff#23519))
- Update isort action comments heading ([#23515](astral-sh/ruff#23515))
- \[`pydocstyle`] Fix double comma in description of `D404` ([#23440](astral-sh/ruff#23440))

- Update the Python module (notably `find_ruff_bin`) for parity with uv ([#23406](astral-sh/ruff#23406))

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Released on 2026-02-19.

- Expand the default rule set ([#23385](astral-sh/ruff#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`](https://docs.astral.sh/ruff/rules/multiple-imports-on-one-line) (`E401`)
  - [`module-import-not-at-top-of-file`](https://docs.astral.sh/ruff/rules/module-import-not-at-top-of-file) (`E402`)
  - [`module-import-not-at-top-of-file`](https://docs.astral.sh/ruff/rules/module-import-not-at-top-of-file) (`E701`)
  - [`multiple-statements-on-one-line-semicolon`](https://docs.astral.sh/ruff/rules/multiple-statements-on-one-line-semicolon) (`E702`)
  - [`useless-semicolon`](https://docs.astral.sh/ruff/rules/useless-semicolon) (`E703`)
  - [`none-comparison`](https://docs.astral.sh/ruff/rules/none-comparison) (`E711`)
  - [`true-false-comparison`](https://docs.astral.sh/ruff/rules/true-false-comparison) (`E712`)
  - [`not-in-test`](https://docs.astral.sh/ruff/rules/not-in-test) (`E713`)
  - [`not-is-test`](https://docs.astral.sh/ruff/rules/not-is-test) (`E714`)
  - [`type-comparison`](https://docs.astral.sh/ruff/rules/type-comparison) (`E721`)
  - [`lambda-assignment`](https://docs.astral.sh/ruff/rules/lambda-assignment) (`E731`)
  - [`ambiguous-variable-name`](https://docs.astral.sh/ruff/rules/ambiguous-variable-name) (`E741`)
  - [`ambiguous-class-name`](https://docs.astral.sh/ruff/rules/ambiguous-class-name) (`E742`)
  - [`ambiguous-function-name`](https://docs.astral.sh/ruff/rules/ambiguous-function-name) (`E743`)
  - [`undefined-local-with-import-star`](https://docs.astral.sh/ruff/rules/undefined-local-with-import-star) (`F403`)
  - [`undefined-local-with-import-star-usage`](https://docs.astral.sh/ruff/rules/undefined-local-with-import-star-usage) (`F405`)
  - [`undefined-local-with-nested-import-star-usage`](https://docs.astral.sh/ruff/rules/undefined-local-with-nested-import-star-usage) (`F406`)
  - [`forward-annotation-syntax-error`](https://docs.astral.sh/ruff/rules/forward-annotation-syntax-error) (`F722`)

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

  ```toml

  # 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](astral-sh/ruff#23203)!

- \[`flake8-pyi`] Also check string annotations (`PYI041`) ([#19023](astral-sh/ruff#19023))

- \[`flake8-async`] Fix `in_async_context` logic ([#23426](astral-sh/ruff#23426))
- \[`ruff`] Fix for `RUF102` should delete entire comment ([#23380](astral-sh/ruff#23380))
- \[`ruff`] Suppress diagnostic for strings with backslashes in interpolations before Python 3.12 (`RUF027`) ([#21069](astral-sh/ruff#21069))
- \[`flake8-bugbear`] Fix `B023` false positive for immediately-invoked lambdas ([#23294](astral-sh/ruff#23294))
- \[parser] Fix false syntax error for match-like annotated assignments ([#23297](astral-sh/ruff#23297))
- \[parser] Fix indentation tracking after line continuations ([#23417](astral-sh/ruff#23417))

- \[`flake8-executable`] Allow global flags in uv shebangs (`EXE003`) ([#22582](astral-sh/ruff#22582))
- \[`pyupgrade`] Fix handling of `typing.{io,re}` (`UP035`) ([#23131](astral-sh/ruff#23131))
- \[`ruff`] Detect `PLC0207` on chained `str.split()` calls ([#23275](astral-sh/ruff#23275))

- Remove invalid inline `noqa` warning ([#23270](astral-sh/ruff#23270))

- Add extension mapping to configuration file options ([#23384](astral-sh/ruff#23384))

- Add `Q004` to the list of conflicting rules ([#23340](astral-sh/ruff#23340))
- \[`ruff`] Expand `lint.external` docs and add sub-diagnostic (`RUF100`, `RUF102`) ([#23268](astral-sh/ruff#23268))

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Released on 2026-02-12.

- \[`airflow`] Add ruff rules to catch deprecated Airflow imports for Airflow 3.1 (`AIR321`) ([#22376](astral-sh/ruff#22376))
- \[`airflow`] Third positional parameter not named `ti_key` should be flagged for `BaseOperatorLink.get_link` (`AIR303`) ([#22828](astral-sh/ruff#22828))
- \[`flake8-gettext`] Fix false negatives for plural argument of `ngettext` (`INT001`, `INT002`, `INT003`) ([#21078](astral-sh/ruff#21078))
- \[`pyflakes`] Fix infinite loop in preview fix for `unused-import` (`F401`) ([#23038](astral-sh/ruff#23038))
- \[`pygrep-hooks`] Detect non-existent mock methods in standalone expressions (`PGH005`) ([#22830](astral-sh/ruff#22830))
- \[`pylint`] Allow dunder submodules and improve diagnostic range (`PLC2701`) ([#22804](astral-sh/ruff#22804))
- \[`pyupgrade`] Improve diagnostic range for tuples (`UP024`) ([#23013](astral-sh/ruff#23013))
- \[`refurb`] Check subscripts in tuple do not use lambda parameters in `reimplemented-operator` (`FURB118`) ([#23079](astral-sh/ruff#23079))
- \[`ruff`] Detect mutable defaults in `field` calls (`RUF008`) ([#23046](astral-sh/ruff#23046))
- \[`ruff`] Ignore std `cmath.inf` (`RUF069`) ([#23120](astral-sh/ruff#23120))
- \[`ruff`] New rule `float-equality-comparison` (`RUF069`) ([#20585](astral-sh/ruff#20585))
- Don't format unlabeled Markdown code blocks ([#23106](astral-sh/ruff#23106))
- Markdown formatting support in LSP ([#23063](astral-sh/ruff#23063))
- Support Quarto Markdown language markers ([#22947](astral-sh/ruff#22947))
- Support formatting `pycon` Markdown code blocks ([#23112](astral-sh/ruff#23112))
- Use extension mapping to select Markdown code block language ([#22934](astral-sh/ruff#22934))

- Avoid false positive for undefined variables in `FAST001` ([#23224](astral-sh/ruff#23224))
- Avoid introducing syntax errors for `FAST003` autofix ([#23227](astral-sh/ruff#23227))
- Avoid suggesting `InitVar` for `__post_init__` that references PEP 695 type parameters ([#23226](astral-sh/ruff#23226))
- Deduplicate type variables in generic functions ([#23225](astral-sh/ruff#23225))
- Fix exception handler parenthesis removal for Python 3.14+ ([#23126](astral-sh/ruff#23126))
- Fix f-string middle panic when parsing t-strings ([#23232](astral-sh/ruff#23232))
- Wrap `RUF020` target for multiline fixes ([#23210](astral-sh/ruff#23210))
- Wrap `UP007` target for multiline fixes ([#23208](astral-sh/ruff#23208))
- Fix missing diagnostics for last range suppression in file ([#23242](astral-sh/ruff#23242))
- \[`pyupgrade`] Fix syntax error on string with newline escape and comment (`UP037`) ([#22968](astral-sh/ruff#22968))

- Use `ruff` instead of `Ruff` as the program name in GitHub output format ([#23240](astral-sh/ruff#23240))
- \[`PT006`] Fix syntax error when unpacking nested tuples in `parametrize` fixes ([#22441](astral-sh/ruff#22441)) ([#22464](astral-sh/ruff#22464))
- \[`airflow`] Catch deprecated attribute access from context key for Airflow 3.0 (`AIR301`) ([#22850](astral-sh/ruff#22850))
- \[`airflow`] Capture deprecated arguments and a decorator (`AIR301`) ([#23170](astral-sh/ruff#23170))
- \[`flake8-boolean-trap`] Add `multiprocessing.Value` to excluded functions for `FBT003` ([#23010](astral-sh/ruff#23010))
- \[`flake8-bugbear`] Add a secondary annotation showing the previous occurrence (`B033`) ([#22634](astral-sh/ruff#22634))
- \[`flake8-type-checking`] Add sub-diagnostic showing the runtime use of an annotation (`TC004`) ([#23091](astral-sh/ruff#23091))
- \[`isort`] Support configurable import section heading comments ([#23151](astral-sh/ruff#23151))
- \[`ruff`] Improve the diagnostic for `RUF012` ([#23202](astral-sh/ruff#23202))

- Suppress diagnostic output for `format --check --silent` ([#17736](astral-sh/ruff#17736))

- Add tabbed shell completion documentation ([#23169](astral-sh/ruff#23169))
- Explain how to enable Markdown formatting for pre-commit hook ([#23077](astral-sh/ruff#23077))
- Fixed import in `runtime-evaluated-decorators` example ([#23187](astral-sh/ruff#23187))
- Update ruff server contributing guide ([#23060](astral-sh/ruff#23060))

- Exclude WASM artifacts from GitHub releases ([#23221](astral-sh/ruff#23221))

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Released on 2026-02-03.

Check out the [blog post](https://astral.sh/blog/ruff-v0.15.0) 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:

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

  See the [documentation](https://docs.astral.sh/ruff/linter/#block-level) 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 `extend`ed 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`](https://docs.astral.sh/ruff/rules/blocking-http-call-httpx-in-async-function)
  (`ASYNC212`)
- [`blocking-path-method-in-async-function`](https://docs.astral.sh/ruff/rules/blocking-path-method-in-async-function)
  (`ASYNC240`)
- [`blocking-input-in-async-function`](https://docs.astral.sh/ruff/rules/blocking-input-in-async-function)
  (`ASYNC250`)
- [`map-without-explicit-strict`](https://docs.astral.sh/ruff/rules/map-without-explicit-strict)
  (`B912`)
- [`if-exp-instead-of-or-operator`](https://docs.astral.sh/ruff/rules/if-exp-instead-of-or-operator)
  (`FURB110`)
- [`single-item-membership-test`](https://docs.astral.sh/ruff/rules/single-item-membership-test)
  (`FURB171`)
- [`missing-maxsplit-arg`](https://docs.astral.sh/ruff/rules/missing-maxsplit-arg) (`PLC0207`)
- [`unnecessary-lambda`](https://docs.astral.sh/ruff/rules/unnecessary-lambda) (`PLW0108`)
- [`unnecessary-empty-iterable-within-deque-call`](https://docs.astral.sh/ruff/rules/unnecessary-empty-iterable-within-deque-call)
  (`RUF037`)
- [`in-empty-collection`](https://docs.astral.sh/ruff/rules/in-empty-collection) (`RUF060`)
- [`legacy-form-pytest-raises`](https://docs.astral.sh/ruff/rules/legacy-form-pytest-raises)
  (`RUF061`)
- [`non-octal-permissions`](https://docs.astral.sh/ruff/rules/non-octal-permissions) (`RUF064`)
- [`invalid-rule-code`](https://docs.astral.sh/ruff/rules/invalid-rule-code) (`RUF102`)
- [`invalid-suppression-comment`](https://docs.astral.sh/ruff/rules/invalid-suppression-comment)
  (`RUF103`)
- [`unmatched-suppression-comment`](https://docs.astral.sh/ruff/rules/unmatched-suppression-comment)
  (`RUF104`)
- [`replace-str-enum`](https://docs.astral.sh/ruff/rules/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`](https://docs.astral.sh/ruff/rules/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`](https://docs.astral.sh/ruff/rules/duplicate-union-member/) (`PYI016`) now considers `typing.Optional` when searching for duplicate union members.
- [`split-static-string`](https://docs.astral.sh/ruff/rules/split-static-string/) (`SIM905`) now offers an autofix when the `maxsplit` argument is provided, even without a `sep` argument.
- [`dict-get-with-none-default`](https://docs.astral.sh/ruff/rules/dict-get-with-none-default/) (`SIM910`) now applies to more types of key expressions.
- [`super-call-with-parameters`](https://docs.astral.sh/ruff/rules/super-call-with-parameters/) (`UP008`) now has a safe fix when it will not delete comments.
- [`unnecessary-default-type-args`](https://docs.astral.sh/ruff/rules/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](astral-sh/ruff#21385))
- Parentheses around tuples of exceptions in `except` clauses will now be removed on Python 3.14 and
  later ([#20768](astral-sh/ruff#20768))
- A single empty line is now permitted at the beginning of function bodies ([#21110](astral-sh/ruff#21110))
- Parentheses are avoided for long `as` captures in `match` statements ([#21176](astral-sh/ruff#21176))
- Extra spaces between escaped quotes and ending triple quotes can now be omitted ([#17216](astral-sh/ruff#17216))
- Blank lines are now enforced before classes with decorators in stub files ([#18888](astral-sh/ruff#18888))

- Apply formatting to Markdown code blocks ([#22470](astral-sh/ruff#22470), [#22990](astral-sh/ruff#22990), [#22996](astral-sh/ruff#22996))

  See the [documentation](https://docs.astral.sh/ruff/formatter/#markdown-code-formatting) for more details.

- Fix suppression indentation matching ([#22903](astral-sh/ruff#22903))

- Customize where the `fix_title` sub-diagnostic appears ([#23044](astral-sh/ruff#23044))
- \[`FastAPI`] Add sub-diagnostic explaining why a fix was unavailable (`FAST002`) ([#22565](astral-sh/ruff#22565))
- \[`flake8-annotations`] Don't suggest `NoReturn` for functions raising `NotImplementedError` (`ANN201`, `ANN202`, `ANN205`, `ANN206`) ([#21311](astral-sh/ruff#21311))
- \[`pyupgrade`] Make fix unsafe if it deletes comments (`UP017`) ([#22873](astral-sh/ruff#22873))
- \[`pyupgrade`] Make fix unsafe if it deletes comments (`UP020`) ([#22872](astral-sh/ruff#22872))
- \[`pyupgrade`] Make fix unsafe if it deletes comments (`UP033`) ([#22871](astral-sh/ruff#22871))
- \[`refurb`] Do not add `abc.ABC` if already present (`FURB180`) ([#22234](astral-sh/ruff#22234))
- \[`refurb`] Make fix unsafe if it deletes comments (`FURB110`) ([#22768](astral-sh/ruff#22768))
- \[`ruff`] Add sub-diagnostics with permissions (`RUF064`) ([#22972](astral-sh/ruff#22972))

- Identify notebooks by LSP `didOpen` instead of `.ipynb` file extension ([#22810](astral-sh/ruff#22810))

- Add `--color` CLI option to force colored output ([#22806](astral-sh/ruff#22806))

- Document `-` stdin convention in CLI help text ([#22817](astral-sh/ruff#22817))
- \[`refurb`] Change example to `re.search` with `^` anchor (`FURB167`) ([#22984](astral-sh/ruff#22984))
- Fix link to Sphinx code block directives ([#23041](astral-sh/ruff#23041))
- \[`pydocstyle`] Clarify which quote styles are allowed (`D300`) ([#22825](astral-sh/ruff#22825))
- \[`flake8-bugbear`] Improve docs for `no-explicit-stacklevel` (`B028`) ([#22538](astral-sh/ruff#22538))

- Update MSRV to 1.91 ([#22874](astral-sh/ruff#22874))

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