[ty] Add support for `types.new_class` by charliermarsh · Pull Request #23144 · astral-sh/ruff

charliermarsh · 2026-02-08T17:46:48Z

Summary

Generally straightforward given that we support type(...); however, I think the base class validation can be a bit looser, since types.new_class does proper metaclass resolution.

Closes astral-sh/ty#2399.

astral-sh-bot · 2026-02-08T17:48:34Z

Typing conformance results

No changes detected ✅

Current numbers

The percentage of diagnostics emitted that were expected errors held steady at 85.05%. The percentage of expected errors that received a diagnostic held steady at 78.05%. The number of fully passing files held steady at 63/132.

astral-sh-bot · 2026-02-08T20:21:59Z

`mypy_primer` results

Changes were detected when running on open source projects

attrs (https://github.com/python-attrs/attrs)
- src/attr/_cmp.py:98:9: error[unresolved-attribute] Object of type `type` has no attribute `_requirements`
- tests/test_make.py:1514:61: error[not-subscriptable] Cannot subscript object of type `type` with no `__class_getitem__` method
+ tests/test_make.py:1514:61: error[not-subscriptable] Cannot subscript object of type `<class 'MyParent'>` with no `__getitem__` method
- Found 671 diagnostics
+ Found 670 diagnostics

spack (https://github.com/spack/spack)
- lib/spack/spack/vendor/attr/_cmp.py:88:9: error[unresolved-attribute] Object of type `type` has no attribute `_requirements`
+ lib/spack/spack/vendor/jinja2/runtime.py:985:36: warning[unused-type-ignore-comment] Unused blanket `type: ignore` directive

pip (https://github.com/pypa/pip)
- src/pip/_vendor/urllib3/request.py:178:25: warning[unsupported-base] Unsupported class base with type `type[ModuleType]`
- Found 700 diagnostics
+ Found 699 diagnostics

jinja (https://github.com/pallets/jinja)
+ src/jinja2/runtime.py:943:36: warning[unused-type-ignore-comment] Unused blanket `type: ignore` directive
- Found 203 diagnostics
+ Found 204 diagnostics

werkzeug (https://github.com/pallets/werkzeug)
- src/werkzeug/test.py:819:32: warning[unsupported-dynamic-base] Unsupported class base: Has type `type[Response] & ~type[TestResponse]`
- Found 386 diagnostics
+ Found 385 diagnostics

scrapy (https://github.com/scrapy/scrapy)
+ scrapy/utils/deprecate.py:63:50: warning[unused-type-ignore-comment] Unused blanket `type: ignore` directive
- tests/test_utils_datatypes.py:152:22: warning[unsupported-base] Unsupported class base with type `type[MutableMapping[Unknown, Unknown]]`
- tests/test_utils_datatypes.py:163:22: warning[unsupported-base] Unsupported class base with type `type[MutableMapping[Unknown, Unknown]]`
- Found 1795 diagnostics
+ Found 1794 diagnostics

nox (https://github.com/wntrblm/nox)
+ nox/logger.py:84:62: warning[unused-type-ignore-comment] Unused blanket `type: ignore` directive
- Found 27 diagnostics
+ Found 28 diagnostics

schemathesis (https://github.com/schemathesis/schemathesis)
+ src/schemathesis/engine/run/stateful/_executor.py:90:54: warning[unused-type-ignore-comment] Unused blanket `type: ignore` directive
- Found 343 diagnostics
+ Found 344 diagnostics

pandera (https://github.com/pandera-dev/pandera)
- pandera/api/dataframe/model.py:306:55: warning[unsupported-dynamic-base] Unsupported class base: Has type `type[Self@__class_getitem__] & <Protocol with members '__parameters__'>`
- pandera/api/pyspark/model.py:211:55: warning[unsupported-dynamic-base] Unsupported class base: Has type `type[Self@__class_getitem__] & <Protocol with members '__parameters__'>`
- Found 1644 diagnostics
+ Found 1642 diagnostics

artigraph (https://github.com/artigraph/artigraph)
- tests/arti/views/test_views.py:23:15: warning[unsupported-base] Unsupported class base with type `type[View]`
- tests/arti/views/test_views.py:32:15: warning[unsupported-base] Unsupported class base with type `type[View]`
- tests/arti/views/test_views.py:35:16: warning[unsupported-base] Unsupported class base with type `type[View]`
- tests/arti/views/test_views.py:39:15: warning[unsupported-base] Unsupported class base with type `type[View]`
- tests/arti/views/test_views.py:49:16: warning[unsupported-base] Unsupported class base with type `type[View]`
- tests/arti/views/test_views.py:60:16: warning[unsupported-base] Unsupported class base with type `type[View]`
- Found 156 diagnostics
+ Found 150 diagnostics

operator (https://github.com/canonical/operator)
- ops/_private/harness.py:431:25: warning[unsupported-base] Unsupported class base with type `Unknown | type[CharmType@Harness]`
- Found 124 diagnostics
+ Found 123 diagnostics

speedrun.com_global_scoreboard_webapp (https://github.com/Avasam/speedrun.com_global_scoreboard_webapp)
- backend/models/game_search_models.py:9:18: warning[unsupported-base] Unsupported class base with type `type[Model]`
- backend/models/tournament_scheduler_models.py:16:16: warning[unsupported-base] Unsupported class base with type `type[Model]`
- backend/models/tournament_scheduler_models.py:83:21: warning[unsupported-base] Unsupported class base with type `type[Model]`
- backend/models/tournament_scheduler_models.py:120:16: warning[unsupported-base] Unsupported class base with type `type[Model]`
- backend/models/tournament_scheduler_models.py:198:20: warning[unsupported-base] Unsupported class base with type `type[Model]`
- backend/models/tournament_scheduler_models.py:228:19: warning[unsupported-base] Unsupported class base with type `type[Model]`
- Found 20 diagnostics
+ Found 14 diagnostics

trio (https://github.com/python-trio/trio)
+ src/trio/_tests/test_exports.py:86:44: warning[unsupported-dynamic-base] Unsupported class base: Has type `type`
- Found 469 diagnostics
+ Found 470 diagnostics

meson (https://github.com/mesonbuild/meson)
- mesonbuild/_pathlib.py:42:16: warning[unsupported-base] Unsupported class base with type `type[Path]`
- Found 2356 diagnostics
+ Found 2355 diagnostics

strawberry (https://github.com/strawberry-graphql/strawberry)
- strawberry/tools/create_type.py:71:12: error[invalid-return-type] Return type does not match returned value: expected `type`, found `<decorator produced by dataclass-like function>`
- Found 342 diagnostics
+ Found 341 diagnostics

sphinx (https://github.com/sphinx-doc/sphinx)
+ sphinx/domains/__init__.py:194:49: warning[unused-type-ignore-comment] Unused blanket `type: ignore` directive
- Found 407 diagnostics
+ Found 408 diagnostics

setuptools (https://github.com/pypa/setuptools)
- setuptools/_vendor/wheel/macosx_libfile.py:300:29: warning[unsupported-base] Unsupported class base with type `type[Structure]`
- setuptools/_vendor/wheel/macosx_libfile.py:306:31: warning[unsupported-base] Unsupported class base with type `type[Structure]`
- setuptools/_vendor/wheel/macosx_libfile.py:311:31: warning[unsupported-base] Unsupported class base with type `type[Structure]`
- setuptools/_vendor/wheel/macosx_libfile.py:363:23: warning[unsupported-base] Unsupported class base with type `type[Structure]`
- setuptools/_vendor/wheel/macosx_libfile.py:368:26: warning[unsupported-base] Unsupported class base with type `type[Structure]`
- setuptools/_vendor/wheel/macosx_libfile.py:373:26: warning[unsupported-base] Unsupported class base with type `type[Structure]`
- setuptools/_vendor/wheel/macosx_libfile.py:383:37: warning[unsupported-base] Unsupported class base with type `type[Structure]`
- setuptools/_vendor/wheel/macosx_libfile.py:390:32: warning[unsupported-base] Unsupported class base with type `type[Structure]`
- Found 1177 diagnostics
+ Found 1169 diagnostics

scikit-build-core (https://github.com/scikit-build/scikit-build-core)
+ src/scikit_build_core/build/wheel.py:99:20: error[no-matching-overload] No overload of bound method `__init__` matches arguments
- Found 59 diagnostics
+ Found 60 diagnostics

pandas (https://github.com/pandas-dev/pandas)
+ pandas/io/formats/style.py:4050:31: warning[unused-type-ignore-comment] Unused blanket `type: ignore` directive
- Found 4583 diagnostics
+ Found 4584 diagnostics

charliermarsh · 2026-02-11T15:23:46Z

I'll mark as draft pending #22792.

astral-sh-bot · 2026-02-14T19:58:00Z

Memory usage report

Memory usage unchanged ✅

carljm · 2026-02-24T17:18:40Z

Closing and reopening this to test the PR auto-assignment workflow.

carljm · 2026-03-11T18:26:18Z

Sorry I haven't got to this yet, it is on the list...

charliermarsh · 2026-03-11T23:39:20Z

Don't worry, it's not urgent, I'm just trying to rebase all my stuff semi-regularly.

charliermarsh added the ty Multi-file analysis & type inference label Feb 8, 2026

charliermarsh force-pushed the charlie/new branch 2 times, most recently from 4f5f14c to 876eead Compare February 8, 2026 20:18

charliermarsh force-pushed the charlie/new branch 2 times, most recently from d90ba3d to 171e68c Compare February 9, 2026 02:01

charliermarsh marked this pull request as ready for review February 9, 2026 02:01

charliermarsh requested review from AlexWaygood, carljm, dcreager and sharkdp as code owners February 9, 2026 02:01

charliermarsh marked this pull request as draft February 9, 2026 02:15

charliermarsh force-pushed the charlie/new branch from 171e68c to 5ec4d35 Compare February 9, 2026 02:20

charliermarsh marked this pull request as ready for review February 9, 2026 02:27

charliermarsh marked this pull request as draft February 11, 2026 15:23

charliermarsh force-pushed the charlie/new branch from 5ec4d35 to dce1aba Compare February 14, 2026 19:54

charliermarsh force-pushed the charlie/new branch 3 times, most recently from ac8a81b to db7116d Compare February 15, 2026 19:23

charliermarsh marked this pull request as ready for review February 15, 2026 19:23

charliermarsh requested a review from ibraheemdev as a code owner February 15, 2026 19:23

charliermarsh force-pushed the charlie/new branch 2 times, most recently from fdac492 to 15d3318 Compare February 18, 2026 16:21

carljm closed this Feb 24, 2026

carljm reopened this Feb 24, 2026

astral-sh-bot bot assigned carljm Feb 24, 2026

charliermarsh force-pushed the charlie/new branch 2 times, most recently from 580f562 to fe529c8 Compare March 4, 2026 14:05

charliermarsh added 3 commits March 11, 2026 11:04

Add support for types.new_class

141c7a5

Change supported bases

14f2bef

Fix deferred

a3a688a

charliermarsh force-pushed the charlie/new branch from fe529c8 to a3a688a Compare March 11, 2026 15:13

Provide feedback

Saved searches

Use saved searches to filter your results more quickly

[ty] Add support for `types.new_class`#23144

[ty] Add support for `types.new_class`#23144
charliermarsh wants to merge 3 commits intomainfrom
charlie/new

charliermarsh commented Feb 8, 2026 •

edited

Loading

Uh oh!

astral-sh-bot bot commented Feb 8, 2026 •

edited

Loading

Uh oh!

astral-sh-bot bot commented Feb 8, 2026 •

edited

Loading

Uh oh!

charliermarsh commented Feb 11, 2026

Uh oh!

astral-sh-bot bot commented Feb 14, 2026 •

edited

Loading

Uh oh!

carljm commented Feb 24, 2026

Uh oh!

carljm commented Mar 11, 2026

Uh oh!

charliermarsh commented Mar 11, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

2 participants

Conversation

charliermarsh commented Feb 8, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Summary

Uh oh!

astral-sh-bot bot commented Feb 8, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Typing conformance results

No changes detected ✅

Uh oh!

astral-sh-bot bot commented Feb 8, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

mypy_primer results

Uh oh!

charliermarsh commented Feb 11, 2026

Uh oh!

astral-sh-bot bot commented Feb 14, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Memory usage report

Uh oh!

carljm commented Feb 24, 2026

Uh oh!

carljm commented Mar 11, 2026

Uh oh!

charliermarsh commented Mar 11, 2026

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

2 participants

charliermarsh commented Feb 8, 2026 •

edited

Loading

astral-sh-bot bot commented Feb 8, 2026 •

edited

Loading

astral-sh-bot bot commented Feb 8, 2026 •

edited

Loading

`mypy_primer` results

astral-sh-bot bot commented Feb 14, 2026 •

edited

Loading