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Showing content from https://github.com/pydantic/pydantic/releases/tag/v2.11.0b1 below:

Release v2.11.0b1 2025-03-06 · pydantic/pydantic · GitHub

What's Changed

Note

Addendum: 2.11 introduced a small behavior change with Final attributes with an underscore:

class Model(BaseModel):
    _var: Final[int] = 1

In 2.10, _var would be considered as a class variable, but as a private attribute in 2.11.
As documented in the blog post, you can make use of ClassVar instead of Final to keep it as a class variable.

Packaging

Add a check_pydantic_core_version() function by @Viicos in #11324
Remove greenlet development dependency by @Viicos in #11351
Use the typing-inspection library by @Viicos in #11479
Bump pydantic-core to v2.31.1 by @sydney-runkle in #11526

New Features

Support unsubstituted type variables with both a default and a bound or constraints by @FyZzyss in #10789
Add a default_factory_takes_validated_data property to FieldInfo by @Viicos in #11034
Raise a better error when a generic alias is used inside type[] by @Viicos in #11088
Properly support PEP 695 generics syntax by @Viicos in #11189
Properly support type variable defaults by @Viicos in #11332
Add support for validating v6, v7, v8 UUIDs by @astei in #11436
Improve alias configuration APIs by @sydney-runkle in #11468

Changes

Rework create_model field definitions format by @Viicos in #11032
Raise a deprecation warning when a field is annotated as final with a default value by @Viicos in #11168
Deprecate accessing model_fields and model_computed_fields on instances by @Viicos in #11169
Breaking Change: Move core schema generation logic for path types inside the GenerateSchema class by @sydney-runkle in #10846
Remove Python 3.8 Support by @sydney-runkle in #11258
Optimize calls to get_type_ref by @Viicos in #10863
Disable pydantic-core core schema validation by @sydney-runkle in #11271

Performance

Only evaluate FieldInfo annotations if required during schema building by @Viicos in #10769
Improve __setattr__ performance of Pydantic models by caching setter functions by @MarkusSintonen in #10868
Improve annotation application performance by @Viicos in #11186
Improve performance of _typing_extra module by @Viicos in #11255
Refactor and optimize schema cleaning logic by @Viicos in #11244
Create a single dictionary when creating a CoreConfig instance by @sydney-runkle in #11384
Bump pydantic-core and thus use SchemaValidator and SchemaSerializer caching by @sydney-runkle in #11402
Reuse cached core schemas for parametrized generic Pydantic models by @MarkusSintonen in #11434

Fixes

Improve TypeAdapter instance repr by @sydney-runkle in #10872
Use the correct frame when instantiating a parametrized TypeAdapter by @Viicos in #10893
Infer final fields with a default value as class variables in the mypy plugin by @Viicos in #11121
Recursively unpack Literal values if using PEP 695 type aliases by @Viicos in #11114
Override __subclasscheck__ on ModelMetaclass to avoid memory leak and performance issues by @Viicos in #11116
Remove unused _extract_get_pydantic_json_schema() parameter by @Viicos in #11155
Improve discriminated union error message for invalid union variants by @Viicos in #11161
Unpack PEP 695 type aliases if using the Annotated form by @Viicos in #11109
Add missing stacklevel in deprecated_instance_property warning by @Viicos in #11200
Copy WithJsonSchema schema to avoid sharing mutated data by @thejcannon in #11014
Do not cache parametrized models when in the process of parametrizing another model by @Viicos in #10704
Add discriminated union related metadata entries to the CoreMetadata definition by @Viicos in #11216
Consolidate schema definitions logic in the _Definitions class by @Viicos in #11208
Support initializing root model fields with values of the root type in the mypy plugin by @Viicos in #11212
Fix various issues with dataclasses and use_attribute_docstrings by @Viicos in #11246
Only compute normalized decimal places if necessary in decimal_places_validator by @misrasaurabh1 in #11281
Add support for validation_alias in the mypy plugin by @Viicos in #11295
Fix JSON Schema reference collection with "examples" keys by @Viicos in #11305
Do not transform model serializer functions as class methods in the mypy plugin by @Viicos in #11298
Simplify GenerateJsonSchema.literal_schema() implementation by @misrasaurabh1 in #11321
Add additional allowed schemes for ClickHouseDsn by @Maze21127 in #11319
Coerce decimal constraints to Decimal instances by @Viicos in #11350
Use the correct JSON Schema mode when handling function schemas by @Viicos in #11367
Improve exception message when encountering recursion errors during type evaluation by @Viicos in #11356
Always include additionalProperties: True for arbitrary dictionary schemas by @austinyu in #11392
Expose fallback parameter in serialization methods by @Viicos in #11398
Fix path serialization behavior by @sydney-runkle in #11416
Do not reuse validators and serializers during model rebuild by @Viicos in #11429
Collect model fields when rebuilding a model by @Viicos in #11388
Allow cached properties to be altered on frozen models by @Viicos in #11432
Fix tuple serialization for Sequence types by @sydney-runkle in #11435
Fix: do not check for __get_validators__ on classes where __get_pydantic_core_schema__ is also defined by @tlambert03 in #11444
Allow callable instances to be used as serializers by @Viicos in #11451
Improve error thrown when overriding field with a property by @sydney-runkle in #11459
Fix JSON Schema generation with referenceable core schemas holding JSON metadata by @Viicos in #11475
Support strict specification on union member types by @sydney-runkle in #11481
Implicitly set validate_by_name to True when validate_by_alias is False by @sydney-runkle in #11503
Change type of Any when synthesizing BaseSettings.__init__ signature in the mypy plugin by @Viicos in #11497
Support type variable defaults referencing other type variables by @Viicos in #11520
Fix ValueError on year zero by @davidhewitt in pydantic/pydantic-core#1583
dataclass InitVar shouldn't be required on serialization by @sydney-runkle in pydantic/pydantic-core#1602

New Contributors

@FyZzyss made their first contribution in #10789
@tamird made their first contribution in #10948
@felixxm made their first contribution in #11077
@alexprabhat99 made their first contribution in #11082
@Kharianne made their first contribution in #11111
@mdaffad made their first contribution in #11177
@thejcannon made their first contribution in #11014
@thomasfrimannkoren made their first contribution in #11251
@usernameMAI made their first contribution in #11275
@ananiavito made their first contribution in #11302
@pawamoy made their first contribution in #11311
@Maze21127 made their first contribution in #11319
@kauabh made their first contribution in #11369
@jaceklaskowski made their first contribution in #11353
@tmpbeing made their first contribution in #11375
@petyosi made their first contribution in #11405
@austinyu made their first contribution in #11392
@mikeedjones made their first contribution in #11402
@astei made their first contribution in #11436
@dsayling made their first contribution in #11522
@sobolevn made their first contribution in pydantic/pydantic-core#1645

Full Changelog: v2.10.6...v2.11.0b1

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