BaseModel

Pydantic 模型只是继承自 BaseModel 并将字段定义为注解属性的类。

pydantic.BaseModel

用法文档

模型

用于创建 Pydantic 模型的基础类。

属性

名称	类型	描述
__class_vars__	set[str]	模型上定义的类变量的名称。
__private_attributes__	Dict[str, ModelPrivateAttr]	关于模型私有属性的元数据。
__signature__	签名	模型合成的 __init__ Signature。
__pydantic_complete__	bool	模型构建是否完成，或者是否还有未定义的字段。
__pydantic_core_schema__	CoreSchema	模型的核心模式。
__pydantic_custom_init__	bool	模型是否具有自定义的 __init__ 函数。
__pydantic_decorators__	DecoratorInfos	包含模型上定义的装饰器的元数据。这取代了 Pydantic V1 中的 Model.__validators__ 和 Model.__root_validators__。
__pydantic_generic_metadata__	PydanticGenericMetadata	泛型模型的元数据；包含用于类似于 typing-module 泛型中的 args、origin、parameters 的目的的数据。最终可能会被这些取代。
__pydantic_parent_namespace__	Dict[str, Any] | None	模型的父命名空间，用于模型的自动重建。
__pydantic_post_init__	None | Literal['model_post_init']	模型 post-init 方法的名称（如果已定义）。
__pydantic_root_model__	bool	模型是否为 RootModel。
__pydantic_serializer__	SchemaSerializer	用于转储模型实例的 pydantic-core SchemaSerializer。
__pydantic_validator__	SchemaValidator | PluggableSchemaValidator	用于验证模型实例的 pydantic-core SchemaValidator。
__pydantic_fields__	Dict[str, FieldInfo]	字段名称及其对应的 FieldInfo 对象的字典。
__pydantic_computed_fields__	Dict[str, ComputedFieldInfo]	计算字段名称及其对应的 ComputedFieldInfo 对象的字典。
__pydantic_extra__	dict[str, Any] | None	如果 extra 设置为 'allow'，则包含额外值的字典。
__pydantic_fields_set__	set[str]	在实例化期间显式设置的字段的名称。
__pydantic_private__	dict[str, Any] | None	在模型实例上设置的私有属性的值。

源代码在 pydantic/main.py 中

class BaseModel(metaclass=_model_construction.ModelMetaclass):
    """!!! abstract "Usage Documentation"
        [Models](../concepts/models.md)

    A base class for creating Pydantic models.

    Attributes:
        __class_vars__: The names of the class variables defined on the model.
        __private_attributes__: Metadata about the private attributes of the model.
        __signature__: The synthesized `__init__` [`Signature`][inspect.Signature] of the model.

        __pydantic_complete__: Whether model building is completed, or if there are still undefined fields.
        __pydantic_core_schema__: The core schema of the model.
        __pydantic_custom_init__: Whether the model has a custom `__init__` function.
        __pydantic_decorators__: Metadata containing the decorators defined on the model.
            This replaces `Model.__validators__` and `Model.__root_validators__` from Pydantic V1.
        __pydantic_generic_metadata__: Metadata for generic models; contains data used for a similar purpose to
            __args__, __origin__, __parameters__ in typing-module generics. May eventually be replaced by these.
        __pydantic_parent_namespace__: Parent namespace of the model, used for automatic rebuilding of models.
        __pydantic_post_init__: The name of the post-init method for the model, if defined.
        __pydantic_root_model__: Whether the model is a [`RootModel`][pydantic.root_model.RootModel].
        __pydantic_serializer__: The `pydantic-core` `SchemaSerializer` used to dump instances of the model.
        __pydantic_validator__: The `pydantic-core` `SchemaValidator` used to validate instances of the model.

        __pydantic_fields__: A dictionary of field names and their corresponding [`FieldInfo`][pydantic.fields.FieldInfo] objects.
        __pydantic_computed_fields__: A dictionary of computed field names and their corresponding [`ComputedFieldInfo`][pydantic.fields.ComputedFieldInfo] objects.

        __pydantic_extra__: A dictionary containing extra values, if [`extra`][pydantic.config.ConfigDict.extra]
            is set to `'allow'`.
        __pydantic_fields_set__: The names of fields explicitly set during instantiation.
        __pydantic_private__: Values of private attributes set on the model instance.
    """

    # Note: Many of the below class vars are defined in the metaclass, but we define them here for type checking purposes.

    model_config: ClassVar[ConfigDict] = ConfigDict()
    """
    Configuration for the model, should be a dictionary conforming to [`ConfigDict`][pydantic.config.ConfigDict].
    """

    __class_vars__: ClassVar[set[str]]
    """The names of the class variables defined on the model."""

    __private_attributes__: ClassVar[Dict[str, ModelPrivateAttr]]  # noqa: UP006
    """Metadata about the private attributes of the model."""

    __signature__: ClassVar[Signature]
    """The synthesized `__init__` [`Signature`][inspect.Signature] of the model."""

    __pydantic_complete__: ClassVar[bool] = False
    """Whether model building is completed, or if there are still undefined fields."""

    __pydantic_core_schema__: ClassVar[CoreSchema]
    """The core schema of the model."""

    __pydantic_custom_init__: ClassVar[bool]
    """Whether the model has a custom `__init__` method."""

    # Must be set for `GenerateSchema.model_schema` to work for a plain `BaseModel` annotation.
    __pydantic_decorators__: ClassVar[_decorators.DecoratorInfos] = _decorators.DecoratorInfos()
    """Metadata containing the decorators defined on the model.
    This replaces `Model.__validators__` and `Model.__root_validators__` from Pydantic V1."""

    __pydantic_generic_metadata__: ClassVar[_generics.PydanticGenericMetadata]
    """Metadata for generic models; contains data used for a similar purpose to
    __args__, __origin__, __parameters__ in typing-module generics. May eventually be replaced by these."""

    __pydantic_parent_namespace__: ClassVar[Dict[str, Any] | None] = None  # noqa: UP006
    """Parent namespace of the model, used for automatic rebuilding of models."""

    __pydantic_post_init__: ClassVar[None | Literal['model_post_init']]
    """The name of the post-init method for the model, if defined."""

    __pydantic_root_model__: ClassVar[bool] = False
    """Whether the model is a [`RootModel`][pydantic.root_model.RootModel]."""

    __pydantic_serializer__: ClassVar[SchemaSerializer]
    """The `pydantic-core` `SchemaSerializer` used to dump instances of the model."""

    __pydantic_validator__: ClassVar[SchemaValidator | PluggableSchemaValidator]
    """The `pydantic-core` `SchemaValidator` used to validate instances of the model."""

    __pydantic_fields__: ClassVar[Dict[str, FieldInfo]]  # noqa: UP006
    """A dictionary of field names and their corresponding [`FieldInfo`][pydantic.fields.FieldInfo] objects.
    This replaces `Model.__fields__` from Pydantic V1.
    """

    __pydantic_setattr_handlers__: ClassVar[Dict[str, Callable[[BaseModel, str, Any], None]]]  # noqa: UP006
    """`__setattr__` handlers. Memoizing the handlers leads to a dramatic performance improvement in `__setattr__`"""

    __pydantic_computed_fields__: ClassVar[Dict[str, ComputedFieldInfo]]  # noqa: UP006
    """A dictionary of computed field names and their corresponding [`ComputedFieldInfo`][pydantic.fields.ComputedFieldInfo] objects."""

    __pydantic_extra__: dict[str, Any] | None = _model_construction.NoInitField(init=False)
    """A dictionary containing extra values, if [`extra`][pydantic.config.ConfigDict.extra] is set to `'allow'`."""

    __pydantic_fields_set__: set[str] = _model_construction.NoInitField(init=False)
    """The names of fields explicitly set during instantiation."""

    __pydantic_private__: dict[str, Any] | None = _model_construction.NoInitField(init=False)
    """Values of private attributes set on the model instance."""

    if not TYPE_CHECKING:
        # Prevent `BaseModel` from being instantiated directly
        # (defined in an `if not TYPE_CHECKING` block for clarity and to avoid type checking errors):
        __pydantic_core_schema__ = _mock_val_ser.MockCoreSchema(
            'Pydantic models should inherit from BaseModel, BaseModel cannot be instantiated directly',
            code='base-model-instantiated',
        )
        __pydantic_validator__ = _mock_val_ser.MockValSer(
            'Pydantic models should inherit from BaseModel, BaseModel cannot be instantiated directly',
            val_or_ser='validator',
            code='base-model-instantiated',
        )
        __pydantic_serializer__ = _mock_val_ser.MockValSer(
            'Pydantic models should inherit from BaseModel, BaseModel cannot be instantiated directly',
            val_or_ser='serializer',
            code='base-model-instantiated',
        )

    __slots__ = '__dict__', '__pydantic_fields_set__', '__pydantic_extra__', '__pydantic_private__'

    def __init__(self, /, **data: Any) -> None:
        """Create a new model by parsing and validating input data from keyword arguments.

        Raises [`ValidationError`][pydantic_core.ValidationError] if the input data cannot be
        validated to form a valid model.

        `self` is explicitly positional-only to allow `self` as a field name.
        """
        # `__tracebackhide__` tells pytest and some other tools to omit this function from tracebacks
        __tracebackhide__ = True
        validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self)
        if self is not validated_self:
            warnings.warn(
                'A custom validator is returning a value other than `self`.\n'
                "Returning anything other than `self` from a top level model validator isn't supported when validating via `__init__`.\n"
                'See the `model_validator` docs (https://docs.pydantic.org.cn/latest/concepts/validators/#model-validators) for more details.',
                stacklevel=2,
            )

    # The following line sets a flag that we use to determine when `__init__` gets overridden by the user
    __init__.__pydantic_base_init__ = True  # pyright: ignore[reportFunctionMemberAccess]

    @_utils.deprecated_instance_property
    @classmethod
    def model_fields(cls) -> dict[str, FieldInfo]:
        """A mapping of field names to their respective [`FieldInfo`][pydantic.fields.FieldInfo] instances.

        !!! warning
            Accessing this attribute from a model instance is deprecated, and will not work in Pydantic V3.
            Instead, you should access this attribute from the model class.
        """
        return getattr(cls, '__pydantic_fields__', {})

    @_utils.deprecated_instance_property
    @classmethod
    def model_computed_fields(cls) -> dict[str, ComputedFieldInfo]:
        """A mapping of computed field names to their respective [`ComputedFieldInfo`][pydantic.fields.ComputedFieldInfo] instances.

        !!! warning
            Accessing this attribute from a model instance is deprecated, and will not work in Pydantic V3.
            Instead, you should access this attribute from the model class.
        """
        return getattr(cls, '__pydantic_computed_fields__', {})

    @property
    def model_extra(self) -> dict[str, Any] | None:
        """Get extra fields set during validation.

        Returns:
            A dictionary of extra fields, or `None` if `config.extra` is not set to `"allow"`.
        """
        return self.__pydantic_extra__

    @property
    def model_fields_set(self) -> set[str]:
        """Returns the set of fields that have been explicitly set on this model instance.

        Returns:
            A set of strings representing the fields that have been set,
                i.e. that were not filled from defaults.
        """
        return self.__pydantic_fields_set__

    @classmethod
    def model_construct(cls, _fields_set: set[str] | None = None, **values: Any) -> Self:  # noqa: C901
        """Creates a new instance of the `Model` class with validated data.

        Creates a new model setting `__dict__` and `__pydantic_fields_set__` from trusted or pre-validated data.
        Default values are respected, but no other validation is performed.

        !!! note
            `model_construct()` generally respects the `model_config.extra` setting on the provided model.
            That is, if `model_config.extra == 'allow'`, then all extra passed values are added to the model instance's `__dict__`
            and `__pydantic_extra__` fields. If `model_config.extra == 'ignore'` (the default), then all extra passed values are ignored.
            Because no validation is performed with a call to `model_construct()`, having `model_config.extra == 'forbid'` does not result in
            an error if extra values are passed, but they will be ignored.

        Args:
            _fields_set: A set of field names that were originally explicitly set during instantiation. If provided,
                this is directly used for the [`model_fields_set`][pydantic.BaseModel.model_fields_set] attribute.
                Otherwise, the field names from the `values` argument will be used.
            values: Trusted or pre-validated data dictionary.

        Returns:
            A new instance of the `Model` class with validated data.
        """
        m = cls.__new__(cls)
        fields_values: dict[str, Any] = {}
        fields_set = set()

        for name, field in cls.__pydantic_fields__.items():
            if field.alias is not None and field.alias in values:
                fields_values[name] = values.pop(field.alias)
                fields_set.add(name)

            if (name not in fields_set) and (field.validation_alias is not None):
                validation_aliases: list[str | AliasPath] = (
                    field.validation_alias.choices
                    if isinstance(field.validation_alias, AliasChoices)
                    else [field.validation_alias]
                )

                for alias in validation_aliases:
                    if isinstance(alias, str) and alias in values:
                        fields_values[name] = values.pop(alias)
                        fields_set.add(name)
                        break
                    elif isinstance(alias, AliasPath):
                        value = alias.search_dict_for_path(values)
                        if value is not PydanticUndefined:
                            fields_values[name] = value
                            fields_set.add(name)
                            break

            if name not in fields_set:
                if name in values:
                    fields_values[name] = values.pop(name)
                    fields_set.add(name)
                elif not field.is_required():
                    fields_values[name] = field.get_default(call_default_factory=True, validated_data=fields_values)
        if _fields_set is None:
            _fields_set = fields_set

        _extra: dict[str, Any] | None = values if cls.model_config.get('extra') == 'allow' else None
        _object_setattr(m, '__dict__', fields_values)
        _object_setattr(m, '__pydantic_fields_set__', _fields_set)
        if not cls.__pydantic_root_model__:
            _object_setattr(m, '__pydantic_extra__', _extra)

        if cls.__pydantic_post_init__:
            m.model_post_init(None)
            # update private attributes with values set
            if hasattr(m, '__pydantic_private__') and m.__pydantic_private__ is not None:
                for k, v in values.items():
                    if k in m.__private_attributes__:
                        m.__pydantic_private__[k] = v

        elif not cls.__pydantic_root_model__:
            # Note: if there are any private attributes, cls.__pydantic_post_init__ would exist
            # Since it doesn't, that means that `__pydantic_private__` should be set to None
            _object_setattr(m, '__pydantic_private__', None)

        return m

    def model_copy(self, *, update: Mapping[str, Any] | None = None, deep: bool = False) -> Self:
        """!!! abstract "Usage Documentation"
            [`model_copy`](../concepts/serialization.md#model_copy)

        Returns a copy of the model.

        !!! note
            The underlying instance's [`__dict__`][object.__dict__] attribute is copied. This
            might have unexpected side effects if you store anything in it, on top of the model
            fields (e.g. the value of [cached properties][functools.cached_property]).

        Args:
            update: Values to change/add in the new model. Note: the data is not validated
                before creating the new model. You should trust this data.
            deep: Set to `True` to make a deep copy of the model.

        Returns:
            New model instance.
        """
        copied = self.__deepcopy__() if deep else self.__copy__()
        if update:
            if self.model_config.get('extra') == 'allow':
                for k, v in update.items():
                    if k in self.__pydantic_fields__:
                        copied.__dict__[k] = v
                    else:
                        if copied.__pydantic_extra__ is None:
                            copied.__pydantic_extra__ = {}
                        copied.__pydantic_extra__[k] = v
            else:
                copied.__dict__.update(update)
            copied.__pydantic_fields_set__.update(update.keys())
        return copied

    def model_dump(
        self,
        *,
        mode: Literal['json', 'python'] | str = 'python',
        include: IncEx | None = None,
        exclude: IncEx | None = None,
        context: Any | None = None,
        by_alias: bool | None = None,
        exclude_unset: bool = False,
        exclude_defaults: bool = False,
        exclude_none: bool = False,
        round_trip: bool = False,
        warnings: bool | Literal['none', 'warn', 'error'] = True,
        fallback: Callable[[Any], Any] | None = None,
        serialize_as_any: bool = False,
    ) -> dict[str, Any]:
        """!!! abstract "Usage Documentation"
            [`model_dump`](../concepts/serialization.md#modelmodel_dump)

        Generate a dictionary representation of the model, optionally specifying which fields to include or exclude.

        Args:
            mode: The mode in which `to_python` should run.
                If mode is 'json', the output will only contain JSON serializable types.
                If mode is 'python', the output may contain non-JSON-serializable Python objects.
            include: A set of fields to include in the output.
            exclude: A set of fields to exclude from the output.
            context: Additional context to pass to the serializer.
            by_alias: Whether to use the field's alias in the dictionary key if defined.
            exclude_unset: Whether to exclude fields that have not been explicitly set.
            exclude_defaults: Whether to exclude fields that are set to their default value.
            exclude_none: Whether to exclude fields that have a value of `None`.
            round_trip: If True, dumped values should be valid as input for non-idempotent types such as Json[T].
            warnings: How to handle serialization errors. False/"none" ignores them, True/"warn" logs errors,
                "error" raises a [`PydanticSerializationError`][pydantic_core.PydanticSerializationError].
            fallback: A function to call when an unknown value is encountered. If not provided,
                a [`PydanticSerializationError`][pydantic_core.PydanticSerializationError] error is raised.
            serialize_as_any: Whether to serialize fields with duck-typing serialization behavior.

        Returns:
            A dictionary representation of the model.
        """
        return self.__pydantic_serializer__.to_python(
            self,
            mode=mode,
            by_alias=by_alias,
            include=include,
            exclude=exclude,
            context=context,
            exclude_unset=exclude_unset,
            exclude_defaults=exclude_defaults,
            exclude_none=exclude_none,
            round_trip=round_trip,
            warnings=warnings,
            fallback=fallback,
            serialize_as_any=serialize_as_any,
        )

    def model_dump_json(
        self,
        *,
        indent: int | None = None,
        include: IncEx | None = None,
        exclude: IncEx | None = None,
        context: Any | None = None,
        by_alias: bool | None = None,
        exclude_unset: bool = False,
        exclude_defaults: bool = False,
        exclude_none: bool = False,
        round_trip: bool = False,
        warnings: bool | Literal['none', 'warn', 'error'] = True,
        fallback: Callable[[Any], Any] | None = None,
        serialize_as_any: bool = False,
    ) -> str:
        """!!! abstract "Usage Documentation"
            [`model_dump_json`](../concepts/serialization.md#modelmodel_dump_json)

        Generates a JSON representation of the model using Pydantic's `to_json` method.

        Args:
            indent: Indentation to use in the JSON output. If None is passed, the output will be compact.
            include: Field(s) to include in the JSON output.
            exclude: Field(s) to exclude from the JSON output.
            context: Additional context to pass to the serializer.
            by_alias: Whether to serialize using field aliases.
            exclude_unset: Whether to exclude fields that have not been explicitly set.
            exclude_defaults: Whether to exclude fields that are set to their default value.
            exclude_none: Whether to exclude fields that have a value of `None`.
            round_trip: If True, dumped values should be valid as input for non-idempotent types such as Json[T].
            warnings: How to handle serialization errors. False/"none" ignores them, True/"warn" logs errors,
                "error" raises a [`PydanticSerializationError`][pydantic_core.PydanticSerializationError].
            fallback: A function to call when an unknown value is encountered. If not provided,
                a [`PydanticSerializationError`][pydantic_core.PydanticSerializationError] error is raised.
            serialize_as_any: Whether to serialize fields with duck-typing serialization behavior.

        Returns:
            A JSON string representation of the model.
        """
        return self.__pydantic_serializer__.to_json(
            self,
            indent=indent,
            include=include,
            exclude=exclude,
            context=context,
            by_alias=by_alias,
            exclude_unset=exclude_unset,
            exclude_defaults=exclude_defaults,
            exclude_none=exclude_none,
            round_trip=round_trip,
            warnings=warnings,
            fallback=fallback,
            serialize_as_any=serialize_as_any,
        ).decode()

    @classmethod
    def model_json_schema(
        cls,
        by_alias: bool = True,
        ref_template: str = DEFAULT_REF_TEMPLATE,
        schema_generator: type[GenerateJsonSchema] = GenerateJsonSchema,
        mode: JsonSchemaMode = 'validation',
    ) -> dict[str, Any]:
        """Generates a JSON schema for a model class.

        Args:
            by_alias: Whether to use attribute aliases or not.
            ref_template: The reference template.
            schema_generator: To override the logic used to generate the JSON schema, as a subclass of
                `GenerateJsonSchema` with your desired modifications
            mode: The mode in which to generate the schema.

        Returns:
            The JSON schema for the given model class.
        """
        return model_json_schema(
            cls, by_alias=by_alias, ref_template=ref_template, schema_generator=schema_generator, mode=mode
        )

    @classmethod
    def model_parametrized_name(cls, params: tuple[type[Any], ...]) -> str:
        """Compute the class name for parametrizations of generic classes.

        This method can be overridden to achieve a custom naming scheme for generic BaseModels.

        Args:
            params: Tuple of types of the class. Given a generic class
                `Model` with 2 type variables and a concrete model `Model[str, int]`,
                the value `(str, int)` would be passed to `params`.

        Returns:
            String representing the new class where `params` are passed to `cls` as type variables.

        Raises:
            TypeError: Raised when trying to generate concrete names for non-generic models.
        """
        if not issubclass(cls, typing.Generic):
            raise TypeError('Concrete names should only be generated for generic models.')

        # Any strings received should represent forward references, so we handle them specially below.
        # If we eventually move toward wrapping them in a ForwardRef in __class_getitem__ in the future,
        # we may be able to remove this special case.
        param_names = [param if isinstance(param, str) else _repr.display_as_type(param) for param in params]
        params_component = ', '.join(param_names)
        return f'{cls.__name__}[{params_component}]'

    def model_post_init(self, context: Any, /) -> None:
        """Override this method to perform additional initialization after `__init__` and `model_construct`.
        This is useful if you want to do some validation that requires the entire model to be initialized.
        """
        pass

    @classmethod
    def model_rebuild(
        cls,
        *,
        force: bool = False,
        raise_errors: bool = True,
        _parent_namespace_depth: int = 2,
        _types_namespace: MappingNamespace | None = None,
    ) -> bool | None:
        """Try to rebuild the pydantic-core schema for the model.

        This may be necessary when one of the annotations is a ForwardRef which could not be resolved during
        the initial attempt to build the schema, and automatic rebuilding fails.

        Args:
            force: Whether to force the rebuilding of the model schema, defaults to `False`.
            raise_errors: Whether to raise errors, defaults to `True`.
            _parent_namespace_depth: The depth level of the parent namespace, defaults to 2.
            _types_namespace: The types namespace, defaults to `None`.

        Returns:
            Returns `None` if the schema is already "complete" and rebuilding was not required.
            If rebuilding _was_ required, returns `True` if rebuilding was successful, otherwise `False`.
        """
        if not force and cls.__pydantic_complete__:
            return None

        for attr in ('__pydantic_core_schema__', '__pydantic_validator__', '__pydantic_serializer__'):
            if attr in cls.__dict__:
                # Deleting the validator/serializer is necessary as otherwise they can get reused in
                # pydantic-core. Same applies for the core schema that can be reused in schema generation.
                delattr(cls, attr)

        cls.__pydantic_complete__ = False

        if _types_namespace is not None:
            rebuild_ns = _types_namespace
        elif _parent_namespace_depth > 0:
            rebuild_ns = _typing_extra.parent_frame_namespace(parent_depth=_parent_namespace_depth, force=True) or {}
        else:
            rebuild_ns = {}

        parent_ns = _model_construction.unpack_lenient_weakvaluedict(cls.__pydantic_parent_namespace__) or {}

        ns_resolver = _namespace_utils.NsResolver(
            parent_namespace={**rebuild_ns, **parent_ns},
        )

        if not cls.__pydantic_fields_complete__:
            typevars_map = _generics.get_model_typevars_map(cls)
            try:
                cls.__pydantic_fields__ = _fields.rebuild_model_fields(
                    cls,
                    ns_resolver=ns_resolver,
                    typevars_map=typevars_map,
                )
            except NameError as e:
                exc = PydanticUndefinedAnnotation.from_name_error(e)
                _mock_val_ser.set_model_mocks(cls, f'`{exc.name}`')
                if raise_errors:
                    raise exc from e

            if not raise_errors and not cls.__pydantic_fields_complete__:
                # No need to continue with schema gen, it is guaranteed to fail
                return False

            assert cls.__pydantic_fields_complete__

        return _model_construction.complete_model_class(
            cls,
            _config.ConfigWrapper(cls.model_config, check=False),
            raise_errors=raise_errors,
            ns_resolver=ns_resolver,
        )

    @classmethod
    def model_validate(
        cls,
        obj: Any,
        *,
        strict: bool | None = None,
        from_attributes: bool | None = None,
        context: Any | None = None,
        by_alias: bool | None = None,
        by_name: bool | None = None,
    ) -> Self:
        """Validate a pydantic model instance.

        Args:
            obj: The object to validate.
            strict: Whether to enforce types strictly.
            from_attributes: Whether to extract data from object attributes.
            context: Additional context to pass to the validator.
            by_alias: Whether to use the field's alias when validating against the provided input data.
            by_name: Whether to use the field's name when validating against the provided input data.

        Raises:
            ValidationError: If the object could not be validated.

        Returns:
            The validated model instance.
        """
        # `__tracebackhide__` tells pytest and some other tools to omit this function from tracebacks
        __tracebackhide__ = True

        if by_alias is False and by_name is not True:
            raise PydanticUserError(
                'At least one of `by_alias` or `by_name` must be set to True.',
                code='validate-by-alias-and-name-false',
            )

        return cls.__pydantic_validator__.validate_python(
            obj, strict=strict, from_attributes=from_attributes, context=context, by_alias=by_alias, by_name=by_name
        )

    @classmethod
    def model_validate_json(
        cls,
        json_data: str | bytes | bytearray,
        *,
        strict: bool | None = None,
        context: Any | None = None,
        by_alias: bool | None = None,
        by_name: bool | None = None,
    ) -> Self:
        """!!! abstract "Usage Documentation"
            [JSON Parsing](../concepts/json.md#json-parsing)

        Validate the given JSON data against the Pydantic model.

        Args:
            json_data: The JSON data to validate.
            strict: Whether to enforce types strictly.
            context: Extra variables to pass to the validator.
            by_alias: Whether to use the field's alias when validating against the provided input data.
            by_name: Whether to use the field's name when validating against the provided input data.

        Returns:
            The validated Pydantic model.

        Raises:
            ValidationError: If `json_data` is not a JSON string or the object could not be validated.
        """
        # `__tracebackhide__` tells pytest and some other tools to omit this function from tracebacks
        __tracebackhide__ = True

        if by_alias is False and by_name is not True:
            raise PydanticUserError(
                'At least one of `by_alias` or `by_name` must be set to True.',
                code='validate-by-alias-and-name-false',
            )

        return cls.__pydantic_validator__.validate_json(
            json_data, strict=strict, context=context, by_alias=by_alias, by_name=by_name
        )

    @classmethod
    def model_validate_strings(
        cls,
        obj: Any,
        *,
        strict: bool | None = None,
        context: Any | None = None,
        by_alias: bool | None = None,
        by_name: bool | None = None,
    ) -> Self:
        """Validate the given object with string data against the Pydantic model.

        Args:
            obj: The object containing string data to validate.
            strict: Whether to enforce types strictly.
            context: Extra variables to pass to the validator.
            by_alias: Whether to use the field's alias when validating against the provided input data.
            by_name: Whether to use the field's name when validating against the provided input data.

        Returns:
            The validated Pydantic model.
        """
        # `__tracebackhide__` tells pytest and some other tools to omit this function from tracebacks
        __tracebackhide__ = True

        if by_alias is False and by_name is not True:
            raise PydanticUserError(
                'At least one of `by_alias` or `by_name` must be set to True.',
                code='validate-by-alias-and-name-false',
            )

        return cls.__pydantic_validator__.validate_strings(
            obj, strict=strict, context=context, by_alias=by_alias, by_name=by_name
        )

    @classmethod
    def __get_pydantic_core_schema__(cls, source: type[BaseModel], handler: GetCoreSchemaHandler, /) -> CoreSchema:
        # This warning is only emitted when calling `super().__get_pydantic_core_schema__` from a model subclass.
        # In the generate schema logic, this method (`BaseModel.__get_pydantic_core_schema__`) is special cased to
        # *not* be called if not overridden.
        warnings.warn(
            'The `__get_pydantic_core_schema__` method of the `BaseModel` class is deprecated. If you are calling '
            '`super().__get_pydantic_core_schema__` when overriding the method on a Pydantic model, consider using '
            '`handler(source)` instead. However, note that overriding this method on models can lead to unexpected '
            'side effects.',
            PydanticDeprecatedSince211,
            stacklevel=2,
        )
        # Logic copied over from `GenerateSchema._model_schema`:
        schema = cls.__dict__.get('__pydantic_core_schema__')
        if schema is not None and not isinstance(schema, _mock_val_ser.MockCoreSchema):
            return cls.__pydantic_core_schema__

        return handler(source)

    @classmethod
    def __get_pydantic_json_schema__(
        cls,
        core_schema: CoreSchema,
        handler: GetJsonSchemaHandler,
        /,
    ) -> JsonSchemaValue:
        """Hook into generating the model's JSON schema.

        Args:
            core_schema: A `pydantic-core` CoreSchema.
                You can ignore this argument and call the handler with a new CoreSchema,
                wrap this CoreSchema (`{'type': 'nullable', 'schema': current_schema}`),
                or just call the handler with the original schema.
            handler: Call into Pydantic's internal JSON schema generation.
                This will raise a `pydantic.errors.PydanticInvalidForJsonSchema` if JSON schema
                generation fails.
                Since this gets called by `BaseModel.model_json_schema` you can override the
                `schema_generator` argument to that function to change JSON schema generation globally
                for a type.

        Returns:
            A JSON schema, as a Python object.
        """
        return handler(core_schema)

    @classmethod
    def __pydantic_init_subclass__(cls, **kwargs: Any) -> None:
        """This is intended to behave just like `__init_subclass__`, but is called by `ModelMetaclass`
        only after the class is actually fully initialized. In particular, attributes like `model_fields` will
        be present when this is called.

        This is necessary because `__init_subclass__` will always be called by `type.__new__`,
        and it would require a prohibitively large refactor to the `ModelMetaclass` to ensure that
        `type.__new__` was called in such a manner that the class would already be sufficiently initialized.

        This will receive the same `kwargs` that would be passed to the standard `__init_subclass__`, namely,
        any kwargs passed to the class definition that aren't used internally by pydantic.

        Args:
            **kwargs: Any keyword arguments passed to the class definition that aren't used internally
                by pydantic.
        """
        pass

    def __class_getitem__(
        cls, typevar_values: type[Any] | tuple[type[Any], ...]
    ) -> type[BaseModel] | _forward_ref.PydanticRecursiveRef:
        cached = _generics.get_cached_generic_type_early(cls, typevar_values)
        if cached is not None:
            return cached

        if cls is BaseModel:
            raise TypeError('Type parameters should be placed on typing.Generic, not BaseModel')
        if not hasattr(cls, '__parameters__'):
            raise TypeError(f'{cls} cannot be parametrized because it does not inherit from typing.Generic')
        if not cls.__pydantic_generic_metadata__['parameters'] and typing.Generic not in cls.__bases__:
            raise TypeError(f'{cls} is not a generic class')

        if not isinstance(typevar_values, tuple):
            typevar_values = (typevar_values,)

        # For a model `class Model[T, U, V = int](BaseModel): ...` parametrized with `(str, bool)`,
        # this gives us `{T: str, U: bool, V: int}`:
        typevars_map = _generics.map_generic_model_arguments(cls, typevar_values)
        # We also update the provided args to use defaults values (`(str, bool)` becomes `(str, bool, int)`):
        typevar_values = tuple(v for v in typevars_map.values())

        if _utils.all_identical(typevars_map.keys(), typevars_map.values()) and typevars_map:
            submodel = cls  # if arguments are equal to parameters it's the same object
            _generics.set_cached_generic_type(cls, typevar_values, submodel)
        else:
            parent_args = cls.__pydantic_generic_metadata__['args']
            if not parent_args:
                args = typevar_values
            else:
                args = tuple(_generics.replace_types(arg, typevars_map) for arg in parent_args)

            origin = cls.__pydantic_generic_metadata__['origin'] or cls
            model_name = origin.model_parametrized_name(args)
            params = tuple(
                {param: None for param in _generics.iter_contained_typevars(typevars_map.values())}
            )  # use dict as ordered set

            with _generics.generic_recursion_self_type(origin, args) as maybe_self_type:
                cached = _generics.get_cached_generic_type_late(cls, typevar_values, origin, args)
                if cached is not None:
                    return cached

                if maybe_self_type is not None:
                    return maybe_self_type

                # Attempt to rebuild the origin in case new types have been defined
                try:
                    # depth 2 gets you above this __class_getitem__ call.
                    # Note that we explicitly provide the parent ns, otherwise
                    # `model_rebuild` will use the parent ns no matter if it is the ns of a module.
                    # We don't want this here, as this has unexpected effects when a model
                    # is being parametrized during a forward annotation evaluation.
                    parent_ns = _typing_extra.parent_frame_namespace(parent_depth=2) or {}
                    origin.model_rebuild(_types_namespace=parent_ns)
                except PydanticUndefinedAnnotation:
                    # It's okay if it fails, it just means there are still undefined types
                    # that could be evaluated later.
                    pass

                submodel = _generics.create_generic_submodel(model_name, origin, args, params)

                # Cache the generated model *only* if not in the process of parametrizing
                # another model. In some valid scenarios, we miss the opportunity to cache
                # it but in some cases this results in `PydanticRecursiveRef` instances left
                # on `FieldInfo` annotations:
                if len(_generics.recursively_defined_type_refs()) == 1:
                    _generics.set_cached_generic_type(cls, typevar_values, submodel, origin, args)

        return submodel

    def __copy__(self) -> Self:
        """Returns a shallow copy of the model."""
        cls = type(self)
        m = cls.__new__(cls)
        _object_setattr(m, '__dict__', copy(self.__dict__))
        _object_setattr(m, '__pydantic_extra__', copy(self.__pydantic_extra__))
        _object_setattr(m, '__pydantic_fields_set__', copy(self.__pydantic_fields_set__))

        if not hasattr(self, '__pydantic_private__') or self.__pydantic_private__ is None:
            _object_setattr(m, '__pydantic_private__', None)
        else:
            _object_setattr(
                m,
                '__pydantic_private__',
                {k: v for k, v in self.__pydantic_private__.items() if v is not PydanticUndefined},
            )

        return m

    def __deepcopy__(self, memo: dict[int, Any] | None = None) -> Self:
        """Returns a deep copy of the model."""
        cls = type(self)
        m = cls.__new__(cls)
        _object_setattr(m, '__dict__', deepcopy(self.__dict__, memo=memo))
        _object_setattr(m, '__pydantic_extra__', deepcopy(self.__pydantic_extra__, memo=memo))
        # This next line doesn't need a deepcopy because __pydantic_fields_set__ is a set[str],
        # and attempting a deepcopy would be marginally slower.
        _object_setattr(m, '__pydantic_fields_set__', copy(self.__pydantic_fields_set__))

        if not hasattr(self, '__pydantic_private__') or self.__pydantic_private__ is None:
            _object_setattr(m, '__pydantic_private__', None)
        else:
            _object_setattr(
                m,
                '__pydantic_private__',
                deepcopy({k: v for k, v in self.__pydantic_private__.items() if v is not PydanticUndefined}, memo=memo),
            )

        return m

    if not TYPE_CHECKING:
        # We put `__getattr__` in a non-TYPE_CHECKING block because otherwise, mypy allows arbitrary attribute access
        # The same goes for __setattr__ and __delattr__, see: https://github.com/pydantic/pydantic/issues/8643

        def __getattr__(self, item: str) -> Any:
            private_attributes = object.__getattribute__(self, '__private_attributes__')
            if item in private_attributes:
                attribute = private_attributes[item]
                if hasattr(attribute, '__get__'):
                    return attribute.__get__(self, type(self))  # type: ignore

                try:
                    # Note: self.__pydantic_private__ cannot be None if self.__private_attributes__ has items
                    return self.__pydantic_private__[item]  # type: ignore
                except KeyError as exc:
                    raise AttributeError(f'{type(self).__name__!r} object has no attribute {item!r}') from exc
            else:
                # `__pydantic_extra__` can fail to be set if the model is not yet fully initialized.
                # See `BaseModel.__repr_args__` for more details
                try:
                    pydantic_extra = object.__getattribute__(self, '__pydantic_extra__')
                except AttributeError:
                    pydantic_extra = None

                if pydantic_extra:
                    try:
                        return pydantic_extra[item]
                    except KeyError as exc:
                        raise AttributeError(f'{type(self).__name__!r} object has no attribute {item!r}') from exc
                else:
                    if hasattr(self.__class__, item):
                        return super().__getattribute__(item)  # Raises AttributeError if appropriate
                    else:
                        # this is the current error
                        raise AttributeError(f'{type(self).__name__!r} object has no attribute {item!r}')

        def __setattr__(self, name: str, value: Any) -> None:
            if (setattr_handler := self.__pydantic_setattr_handlers__.get(name)) is not None:
                setattr_handler(self, name, value)
            # if None is returned from _setattr_handler, the attribute was set directly
            elif (setattr_handler := self._setattr_handler(name, value)) is not None:
                setattr_handler(self, name, value)  # call here to not memo on possibly unknown fields
                self.__pydantic_setattr_handlers__[name] = setattr_handler  # memoize the handler for faster access

        def _setattr_handler(self, name: str, value: Any) -> Callable[[BaseModel, str, Any], None] | None:
            """Get a handler for setting an attribute on the model instance.

            Returns:
                A handler for setting an attribute on the model instance. Used for memoization of the handler.
                Memoizing the handlers leads to a dramatic performance improvement in `__setattr__`
                Returns `None` when memoization is not safe, then the attribute is set directly.
            """
            cls = self.__class__
            if name in cls.__class_vars__:
                raise AttributeError(
                    f'{name!r} is a ClassVar of `{cls.__name__}` and cannot be set on an instance. '
                    f'If you want to set a value on the class, use `{cls.__name__}.{name} = value`.'
                )
            elif not _fields.is_valid_field_name(name):
                if (attribute := cls.__private_attributes__.get(name)) is not None:
                    if hasattr(attribute, '__set__'):
                        return lambda model, _name, val: attribute.__set__(model, val)
                    else:
                        return _SIMPLE_SETATTR_HANDLERS['private']
                else:
                    _object_setattr(self, name, value)
                    return None  # Can not return memoized handler with possibly freeform attr names

            attr = getattr(cls, name, None)
            # NOTE: We currently special case properties and `cached_property`, but we might need
            # to generalize this to all data/non-data descriptors at some point. For non-data descriptors
            # (such as `cached_property`), it isn't obvious though. `cached_property` caches the value
            # to the instance's `__dict__`, but other non-data descriptors might do things differently.
            if isinstance(attr, cached_property):
                return _SIMPLE_SETATTR_HANDLERS['cached_property']

            _check_frozen(cls, name, value)

            # We allow properties to be set only on non frozen models for now (to match dataclasses).
            # This can be changed if it ever gets requested.
            if isinstance(attr, property):
                return lambda model, _name, val: attr.__set__(model, val)
            elif cls.model_config.get('validate_assignment'):
                return _SIMPLE_SETATTR_HANDLERS['validate_assignment']
            elif name not in cls.__pydantic_fields__:
                if cls.model_config.get('extra') != 'allow':
                    # TODO - matching error
                    raise ValueError(f'"{cls.__name__}" object has no field "{name}"')
                elif attr is None:
                    # attribute does not exist, so put it in extra
                    self.__pydantic_extra__[name] = value
                    return None  # Can not return memoized handler with possibly freeform attr names
                else:
                    # attribute _does_ exist, and was not in extra, so update it
                    return _SIMPLE_SETATTR_HANDLERS['extra_known']
            else:
                return _SIMPLE_SETATTR_HANDLERS['model_field']

        def __delattr__(self, item: str) -> Any:
            cls = self.__class__

            if item in self.__private_attributes__:
                attribute = self.__private_attributes__[item]
                if hasattr(attribute, '__delete__'):
                    attribute.__delete__(self)  # type: ignore
                    return

                try:
                    # Note: self.__pydantic_private__ cannot be None if self.__private_attributes__ has items
                    del self.__pydantic_private__[item]  # type: ignore
                    return
                except KeyError as exc:
                    raise AttributeError(f'{cls.__name__!r} object has no attribute {item!r}') from exc

            # Allow cached properties to be deleted (even if the class is frozen):
            attr = getattr(cls, item, None)
            if isinstance(attr, cached_property):
                return object.__delattr__(self, item)

            _check_frozen(cls, name=item, value=None)

            if item in self.__pydantic_fields__:
                object.__delattr__(self, item)
            elif self.__pydantic_extra__ is not None and item in self.__pydantic_extra__:
                del self.__pydantic_extra__[item]
            else:
                try:
                    object.__delattr__(self, item)
                except AttributeError:
                    raise AttributeError(f'{type(self).__name__!r} object has no attribute {item!r}')

        # Because we make use of `@dataclass_transform()`, `__replace__` is already synthesized by
        # type checkers, so we define the implementation in this `if not TYPE_CHECKING:` block:
        def __replace__(self, **changes: Any) -> Self:
            return self.model_copy(update=changes)

    def __getstate__(self) -> dict[Any, Any]:
        private = self.__pydantic_private__
        if private:
            private = {k: v for k, v in private.items() if v is not PydanticUndefined}
        return {
            '__dict__': self.__dict__,
            '__pydantic_extra__': self.__pydantic_extra__,
            '__pydantic_fields_set__': self.__pydantic_fields_set__,
            '__pydantic_private__': private,
        }

    def __setstate__(self, state: dict[Any, Any]) -> None:
        _object_setattr(self, '__pydantic_fields_set__', state.get('__pydantic_fields_set__', {}))
        _object_setattr(self, '__pydantic_extra__', state.get('__pydantic_extra__', {}))
        _object_setattr(self, '__pydantic_private__', state.get('__pydantic_private__', {}))
        _object_setattr(self, '__dict__', state.get('__dict__', {}))

    if not TYPE_CHECKING:

        def __eq__(self, other: Any) -> bool:
            if isinstance(other, BaseModel):
                # When comparing instances of generic types for equality, as long as all field values are equal,
                # only require their generic origin types to be equal, rather than exact type equality.
                # This prevents headaches like MyGeneric(x=1) != MyGeneric[Any](x=1).
                self_type = self.__pydantic_generic_metadata__['origin'] or self.__class__
                other_type = other.__pydantic_generic_metadata__['origin'] or other.__class__

                # Perform common checks first
                if not (
                    self_type == other_type
                    and getattr(self, '__pydantic_private__', None) == getattr(other, '__pydantic_private__', None)
                    and self.__pydantic_extra__ == other.__pydantic_extra__
                ):
                    return False

                # We only want to compare pydantic fields but ignoring fields is costly.
                # We'll perform a fast check first, and fallback only when needed
                # See GH-7444 and GH-7825 for rationale and a performance benchmark

                # First, do the fast (and sometimes faulty) __dict__ comparison
                if self.__dict__ == other.__dict__:
                    # If the check above passes, then pydantic fields are equal, we can return early
                    return True

                # We don't want to trigger unnecessary costly filtering of __dict__ on all unequal objects, so we return
                # early if there are no keys to ignore (we would just return False later on anyway)
                model_fields = type(self).__pydantic_fields__.keys()
                if self.__dict__.keys() <= model_fields and other.__dict__.keys() <= model_fields:
                    return False

                # If we reach here, there are non-pydantic-fields keys, mapped to unequal values, that we need to ignore
                # Resort to costly filtering of the __dict__ objects
                # We use operator.itemgetter because it is much faster than dict comprehensions
                # NOTE: Contrary to standard python class and instances, when the Model class has a default value for an
                # attribute and the model instance doesn't have a corresponding attribute, accessing the missing attribute
                # raises an error in BaseModel.__getattr__ instead of returning the class attribute
                # So we can use operator.itemgetter() instead of operator.attrgetter()
                getter = operator.itemgetter(*model_fields) if model_fields else lambda _: _utils._SENTINEL
                try:
                    return getter(self.__dict__) == getter(other.__dict__)
                except KeyError:
                    # In rare cases (such as when using the deprecated BaseModel.copy() method),
                    # the __dict__ may not contain all model fields, which is how we can get here.
                    # getter(self.__dict__) is much faster than any 'safe' method that accounts
                    # for missing keys, and wrapping it in a `try` doesn't slow things down much
                    # in the common case.
                    self_fields_proxy = _utils.SafeGetItemProxy(self.__dict__)
                    other_fields_proxy = _utils.SafeGetItemProxy(other.__dict__)
                    return getter(self_fields_proxy) == getter(other_fields_proxy)

            # other instance is not a BaseModel
            else:
                return NotImplemented  # delegate to the other item in the comparison

    if TYPE_CHECKING:
        # We put `__init_subclass__` in a TYPE_CHECKING block because, even though we want the type-checking benefits
        # described in the signature of `__init_subclass__` below, we don't want to modify the default behavior of
        # subclass initialization.

        def __init_subclass__(cls, **kwargs: Unpack[ConfigDict]):
            """This signature is included purely to help type-checkers check arguments to class declaration, which
            provides a way to conveniently set model_config key/value pairs.

            ```python
            from pydantic import BaseModel

            class MyModel(BaseModel, extra='allow'): ...
            ```

            However, this may be deceiving, since the _actual_ calls to `__init_subclass__` will not receive any
            of the config arguments, and will only receive any keyword arguments passed during class initialization
            that are _not_ expected keys in ConfigDict. (This is due to the way `ModelMetaclass.__new__` works.)

            Args:
                **kwargs: Keyword arguments passed to the class definition, which set model_config

            Note:
                You may want to override `__pydantic_init_subclass__` instead, which behaves similarly but is called
                *after* the class is fully initialized.
            """

    def __iter__(self) -> TupleGenerator:
        """So `dict(model)` works."""
        yield from [(k, v) for (k, v) in self.__dict__.items() if not k.startswith('_')]
        extra = self.__pydantic_extra__
        if extra:
            yield from extra.items()

    def __repr__(self) -> str:
        return f'{self.__repr_name__()}({self.__repr_str__(", ")})'

    def __repr_args__(self) -> _repr.ReprArgs:
        # Eagerly create the repr of computed fields, as this may trigger access of cached properties and as such
        # modify the instance's `__dict__`. If we don't do it now, it could happen when iterating over the `__dict__`
        # below if the instance happens to be referenced in a field, and would modify the `__dict__` size *during* iteration.
        computed_fields_repr_args = [
            (k, getattr(self, k)) for k, v in self.__pydantic_computed_fields__.items() if v.repr
        ]

        for k, v in self.__dict__.items():
            field = self.__pydantic_fields__.get(k)
            if field and field.repr:
                if v is not self:
                    yield k, v
                else:
                    yield k, self.__repr_recursion__(v)
        # `__pydantic_extra__` can fail to be set if the model is not yet fully initialized.
        # This can happen if a `ValidationError` is raised during initialization and the instance's
        # repr is generated as part of the exception handling. Therefore, we use `getattr` here
        # with a fallback, even though the type hints indicate the attribute will always be present.
        try:
            pydantic_extra = object.__getattribute__(self, '__pydantic_extra__')
        except AttributeError:
            pydantic_extra = None

        if pydantic_extra is not None:
            yield from ((k, v) for k, v in pydantic_extra.items())
        yield from computed_fields_repr_args

    # take logic from `_repr.Representation` without the side effects of inheritance, see #5740
    __repr_name__ = _repr.Representation.__repr_name__
    __repr_recursion__ = _repr.Representation.__repr_recursion__
    __repr_str__ = _repr.Representation.__repr_str__
    __pretty__ = _repr.Representation.__pretty__
    __rich_repr__ = _repr.Representation.__rich_repr__

    def __str__(self) -> str:
        return self.__repr_str__(' ')

    # ##### Deprecated methods from v1 #####
    @property
    @typing_extensions.deprecated(
        'The `__fields__` attribute is deprecated, use `model_fields` instead.', category=None
    )
    def __fields__(self) -> dict[str, FieldInfo]:
        warnings.warn(
            'The `__fields__` attribute is deprecated, use `model_fields` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        return getattr(type(self), '__pydantic_fields__', {})

    @property
    @typing_extensions.deprecated(
        'The `__fields_set__` attribute is deprecated, use `model_fields_set` instead.',
        category=None,
    )
    def __fields_set__(self) -> set[str]:
        warnings.warn(
            'The `__fields_set__` attribute is deprecated, use `model_fields_set` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        return self.__pydantic_fields_set__

    @typing_extensions.deprecated('The `dict` method is deprecated; use `model_dump` instead.', category=None)
    def dict(  # noqa: D102
        self,
        *,
        include: IncEx | None = None,
        exclude: IncEx | None = None,
        by_alias: bool = False,
        exclude_unset: bool = False,
        exclude_defaults: bool = False,
        exclude_none: bool = False,
    ) -> Dict[str, Any]:  # noqa UP006
        warnings.warn(
            'The `dict` method is deprecated; use `model_dump` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        return self.model_dump(
            include=include,
            exclude=exclude,
            by_alias=by_alias,
            exclude_unset=exclude_unset,
            exclude_defaults=exclude_defaults,
            exclude_none=exclude_none,
        )

    @typing_extensions.deprecated('The `json` method is deprecated; use `model_dump_json` instead.', category=None)
    def json(  # noqa: D102
        self,
        *,
        include: IncEx | None = None,
        exclude: IncEx | None = None,
        by_alias: bool = False,
        exclude_unset: bool = False,
        exclude_defaults: bool = False,
        exclude_none: bool = False,
        encoder: Callable[[Any], Any] | None = PydanticUndefined,  # type: ignore[assignment]
        models_as_dict: bool = PydanticUndefined,  # type: ignore[assignment]
        **dumps_kwargs: Any,
    ) -> str:
        warnings.warn(
            'The `json` method is deprecated; use `model_dump_json` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        if encoder is not PydanticUndefined:
            raise TypeError('The `encoder` argument is no longer supported; use field serializers instead.')
        if models_as_dict is not PydanticUndefined:
            raise TypeError('The `models_as_dict` argument is no longer supported; use a model serializer instead.')
        if dumps_kwargs:
            raise TypeError('`dumps_kwargs` keyword arguments are no longer supported.')
        return self.model_dump_json(
            include=include,
            exclude=exclude,
            by_alias=by_alias,
            exclude_unset=exclude_unset,
            exclude_defaults=exclude_defaults,
            exclude_none=exclude_none,
        )

    @classmethod
    @typing_extensions.deprecated('The `parse_obj` method is deprecated; use `model_validate` instead.', category=None)
    def parse_obj(cls, obj: Any) -> Self:  # noqa: D102
        warnings.warn(
            'The `parse_obj` method is deprecated; use `model_validate` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        return cls.model_validate(obj)

    @classmethod
    @typing_extensions.deprecated(
        'The `parse_raw` method is deprecated; if your data is JSON use `model_validate_json`, '
        'otherwise load the data then use `model_validate` instead.',
        category=None,
    )
    def parse_raw(  # noqa: D102
        cls,
        b: str | bytes,
        *,
        content_type: str | None = None,
        encoding: str = 'utf8',
        proto: DeprecatedParseProtocol | None = None,
        allow_pickle: bool = False,
    ) -> Self:  # pragma: no cover
        warnings.warn(
            'The `parse_raw` method is deprecated; if your data is JSON use `model_validate_json`, '
            'otherwise load the data then use `model_validate` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        from .deprecated import parse

        try:
            obj = parse.load_str_bytes(
                b,
                proto=proto,
                content_type=content_type,
                encoding=encoding,
                allow_pickle=allow_pickle,
            )
        except (ValueError, TypeError) as exc:
            import json

            # try to match V1
            if isinstance(exc, UnicodeDecodeError):
                type_str = 'value_error.unicodedecode'
            elif isinstance(exc, json.JSONDecodeError):
                type_str = 'value_error.jsondecode'
            elif isinstance(exc, ValueError):
                type_str = 'value_error'
            else:
                type_str = 'type_error'

            # ctx is missing here, but since we've added `input` to the error, we're not pretending it's the same
            error: pydantic_core.InitErrorDetails = {
                # The type: ignore on the next line is to ignore the requirement of LiteralString
                'type': pydantic_core.PydanticCustomError(type_str, str(exc)),  # type: ignore
                'loc': ('__root__',),
                'input': b,
            }
            raise pydantic_core.ValidationError.from_exception_data(cls.__name__, [error])
        return cls.model_validate(obj)

    @classmethod
    @typing_extensions.deprecated(
        'The `parse_file` method is deprecated; load the data from file, then if your data is JSON '
        'use `model_validate_json`, otherwise `model_validate` instead.',
        category=None,
    )
    def parse_file(  # noqa: D102
        cls,
        path: str | Path,
        *,
        content_type: str | None = None,
        encoding: str = 'utf8',
        proto: DeprecatedParseProtocol | None = None,
        allow_pickle: bool = False,
    ) -> Self:
        warnings.warn(
            'The `parse_file` method is deprecated; load the data from file, then if your data is JSON '
            'use `model_validate_json`, otherwise `model_validate` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        from .deprecated import parse

        obj = parse.load_file(
            path,
            proto=proto,
            content_type=content_type,
            encoding=encoding,
            allow_pickle=allow_pickle,
        )
        return cls.parse_obj(obj)

    @classmethod
    @typing_extensions.deprecated(
        'The `from_orm` method is deprecated; set '
        "`model_config['from_attributes']=True` and use `model_validate` instead.",
        category=None,
    )
    def from_orm(cls, obj: Any) -> Self:  # noqa: D102
        warnings.warn(
            'The `from_orm` method is deprecated; set '
            "`model_config['from_attributes']=True` and use `model_validate` instead.",
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        if not cls.model_config.get('from_attributes', None):
            raise PydanticUserError(
                'You must set the config attribute `from_attributes=True` to use from_orm', code=None
            )
        return cls.model_validate(obj)

    @classmethod
    @typing_extensions.deprecated('The `construct` method is deprecated; use `model_construct` instead.', category=None)
    def construct(cls, _fields_set: set[str] | None = None, **values: Any) -> Self:  # noqa: D102
        warnings.warn(
            'The `construct` method is deprecated; use `model_construct` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        return cls.model_construct(_fields_set=_fields_set, **values)

    @typing_extensions.deprecated(
        'The `copy` method is deprecated; use `model_copy` instead. '
        'See the docstring of `BaseModel.copy` for details about how to handle `include` and `exclude`.',
        category=None,
    )
    def copy(
        self,
        *,
        include: AbstractSetIntStr | MappingIntStrAny | None = None,
        exclude: AbstractSetIntStr | MappingIntStrAny | None = None,
        update: Dict[str, Any] | None = None,  # noqa UP006
        deep: bool = False,
    ) -> Self:  # pragma: no cover
        """Returns a copy of the model.

        !!! warning "Deprecated"
            This method is now deprecated; use `model_copy` instead.

        If you need `include` or `exclude`, use:

        ```python {test="skip" lint="skip"}
        data = self.model_dump(include=include, exclude=exclude, round_trip=True)
        data = {**data, **(update or {})}
        copied = self.model_validate(data)
        ```

        Args:
            include: Optional set or mapping specifying which fields to include in the copied model.
            exclude: Optional set or mapping specifying which fields to exclude in the copied model.
            update: Optional dictionary of field-value pairs to override field values in the copied model.
            deep: If True, the values of fields that are Pydantic models will be deep-copied.

        Returns:
            A copy of the model with included, excluded and updated fields as specified.
        """
        warnings.warn(
            'The `copy` method is deprecated; use `model_copy` instead. '
            'See the docstring of `BaseModel.copy` for details about how to handle `include` and `exclude`.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        from .deprecated import copy_internals

        values = dict(
            copy_internals._iter(
                self, to_dict=False, by_alias=False, include=include, exclude=exclude, exclude_unset=False
            ),
            **(update or {}),
        )
        if self.__pydantic_private__ is None:
            private = None
        else:
            private = {k: v for k, v in self.__pydantic_private__.items() if v is not PydanticUndefined}

        if self.__pydantic_extra__ is None:
            extra: dict[str, Any] | None = None
        else:
            extra = self.__pydantic_extra__.copy()
            for k in list(self.__pydantic_extra__):
                if k not in values:  # k was in the exclude
                    extra.pop(k)
            for k in list(values):
                if k in self.__pydantic_extra__:  # k must have come from extra
                    extra[k] = values.pop(k)

        # new `__pydantic_fields_set__` can have unset optional fields with a set value in `update` kwarg
        if update:
            fields_set = self.__pydantic_fields_set__ | update.keys()
        else:
            fields_set = set(self.__pydantic_fields_set__)

        # removing excluded fields from `__pydantic_fields_set__`
        if exclude:
            fields_set -= set(exclude)

        return copy_internals._copy_and_set_values(self, values, fields_set, extra, private, deep=deep)

    @classmethod
    @typing_extensions.deprecated('The `schema` method is deprecated; use `model_json_schema` instead.', category=None)
    def schema(  # noqa: D102
        cls, by_alias: bool = True, ref_template: str = DEFAULT_REF_TEMPLATE
    ) -> Dict[str, Any]:  # noqa UP006
        warnings.warn(
            'The `schema` method is deprecated; use `model_json_schema` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        return cls.model_json_schema(by_alias=by_alias, ref_template=ref_template)

    @classmethod
    @typing_extensions.deprecated(
        'The `schema_json` method is deprecated; use `model_json_schema` and json.dumps instead.',
        category=None,
    )
    def schema_json(  # noqa: D102
        cls, *, by_alias: bool = True, ref_template: str = DEFAULT_REF_TEMPLATE, **dumps_kwargs: Any
    ) -> str:  # pragma: no cover
        warnings.warn(
            'The `schema_json` method is deprecated; use `model_json_schema` and json.dumps instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        import json

        from .deprecated.json import pydantic_encoder

        return json.dumps(
            cls.model_json_schema(by_alias=by_alias, ref_template=ref_template),
            default=pydantic_encoder,
            **dumps_kwargs,
        )

    @classmethod
    @typing_extensions.deprecated('The `validate` method is deprecated; use `model_validate` instead.', category=None)
    def validate(cls, value: Any) -> Self:  # noqa: D102
        warnings.warn(
            'The `validate` method is deprecated; use `model_validate` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        return cls.model_validate(value)

    @classmethod
    @typing_extensions.deprecated(
        'The `update_forward_refs` method is deprecated; use `model_rebuild` instead.',
        category=None,
    )
    def update_forward_refs(cls, **localns: Any) -> None:  # noqa: D102
        warnings.warn(
            'The `update_forward_refs` method is deprecated; use `model_rebuild` instead.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        if localns:  # pragma: no cover
            raise TypeError('`localns` arguments are not longer accepted.')
        cls.model_rebuild(force=True)

    @typing_extensions.deprecated(
        'The private method `_iter` will be removed and should no longer be used.', category=None
    )
    def _iter(self, *args: Any, **kwargs: Any) -> Any:
        warnings.warn(
            'The private method `_iter` will be removed and should no longer be used.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        from .deprecated import copy_internals

        return copy_internals._iter(self, *args, **kwargs)

    @typing_extensions.deprecated(
        'The private method `_copy_and_set_values` will be removed and should no longer be used.',
        category=None,
    )
    def _copy_and_set_values(self, *args: Any, **kwargs: Any) -> Any:
        warnings.warn(
            'The private method `_copy_and_set_values` will be removed and should no longer be used.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        from .deprecated import copy_internals

        return copy_internals._copy_and_set_values(self, *args, **kwargs)

    @classmethod
    @typing_extensions.deprecated(
        'The private method `_get_value` will be removed and should no longer be used.',
        category=None,
    )
    def _get_value(cls, *args: Any, **kwargs: Any) -> Any:
        warnings.warn(
            'The private method `_get_value` will be removed and should no longer be used.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        from .deprecated import copy_internals

        return copy_internals._get_value(cls, *args, **kwargs)

    @typing_extensions.deprecated(
        'The private method `_calculate_keys` will be removed and should no longer be used.',
        category=None,
    )
    def _calculate_keys(self, *args: Any, **kwargs: Any) -> Any:
        warnings.warn(
            'The private method `_calculate_keys` will be removed and should no longer be used.',
            category=PydanticDeprecatedSince20,
            stacklevel=2,
        )
        from .deprecated import copy_internals

        return copy_internals._calculate_keys(self, *args, **kwargs)

__init__

__init__(**data: Any) -> None

如果输入数据无法验证以形成有效的模型，则引发 ValidationError。

self 显式地仅为位置参数，以允许将 self 用作字段名称。

源代码在 pydantic/main.py 中

def __init__(self, /, **data: Any) -> None:
    """Create a new model by parsing and validating input data from keyword arguments.

    Raises [`ValidationError`][pydantic_core.ValidationError] if the input data cannot be
    validated to form a valid model.

    `self` is explicitly positional-only to allow `self` as a field name.
    """
    # `__tracebackhide__` tells pytest and some other tools to omit this function from tracebacks
    __tracebackhide__ = True
    validated_self = self.__pydantic_validator__.validate_python(data, self_instance=self)
    if self is not validated_self:
        warnings.warn(
            'A custom validator is returning a value other than `self`.\n'
            "Returning anything other than `self` from a top level model validator isn't supported when validating via `__init__`.\n"
            'See the `model_validator` docs (https://docs.pydantic.org.cn/latest/concepts/validators/#model-validators) for more details.',
            stacklevel=2,
        )

model_config class-attribute

model_config: ConfigDict = ConfigDict()

模型的配置，应该是一个符合 ConfigDict 的字典。

model_fields classmethod

model_fields() -> dict[str, FieldInfo]

字段名称到其各自的 FieldInfo 实例的映射。

警告

从模型实例访问此属性已被弃用，并且在 Pydantic V3 中将不起作用。相反，您应该从模型类访问此属性。

源代码在 pydantic/main.py 中

@_utils.deprecated_instance_property
@classmethod
def model_fields(cls) -> dict[str, FieldInfo]:
    """A mapping of field names to their respective [`FieldInfo`][pydantic.fields.FieldInfo] instances.

    !!! warning
        Accessing this attribute from a model instance is deprecated, and will not work in Pydantic V3.
        Instead, you should access this attribute from the model class.
    """
    return getattr(cls, '__pydantic_fields__', {})

model_computed_fields classmethod

model_computed_fields() -> dict[str, ComputedFieldInfo]

计算字段名称到其各自的 ComputedFieldInfo 实例的映射。

警告

从模型实例访问此属性已被弃用，并且在 Pydantic V3 中将不起作用。相反，您应该从模型类访问此属性。

源代码在 pydantic/main.py 中

@_utils.deprecated_instance_property
@classmethod
def model_computed_fields(cls) -> dict[str, ComputedFieldInfo]:
    """A mapping of computed field names to their respective [`ComputedFieldInfo`][pydantic.fields.ComputedFieldInfo] instances.

    !!! warning
        Accessing this attribute from a model instance is deprecated, and will not work in Pydantic V3.
        Instead, you should access this attribute from the model class.
    """
    return getattr(cls, '__pydantic_computed_fields__', {})

__pydantic_core_schema__ class-attribute

__pydantic_core_schema__: CoreSchema

模型的核心模式。

model_extra property

model_extra: dict[str, Any] | None

获取在验证期间设置的额外字段。

返回

类型	描述
dict[str, Any] | None	额外字段的字典，如果 config.extra 未设置为 "allow"，则返回 None。

model_fields_set property

model_fields_set: set[str]

返回在此模型实例上已显式设置的字段的集合。

返回

类型	描述
set[str]	表示已设置字段的字符串集合，即未从默认值填充的字段。

model_construct classmethod

model_construct(
    _fields_set: set[str] | None = None, **values: Any
) -> Self

使用已验证的数据创建 Model 类的新实例。

创建一个新的模型，从受信任或预验证的数据设置 __dict__ 和 __pydantic_fields_set__。默认值将被遵循，但不会执行其他验证。

注意

model_construct() 通常遵循所提供模型上的 model_config.extra 设置。也就是说，如果 model_config.extra == 'allow'，则所有传递的额外值都将添加到模型实例的 __dict__ 和 __pydantic_extra__ 字段。如果 model_config.extra == 'ignore'（默认值），则所有传递的额外值都将被忽略。由于调用 model_construct() 不执行验证，因此如果传递了额外值，则具有 model_config.extra == 'forbid' 不会导致错误，但它们将被忽略。

参数

名称	类型	描述	默认
_fields_set	set[str] | None	在实例化期间最初显式设置的字段名称集合。如果提供，这将直接用于 model_fields_set 属性。否则，将使用 values 参数中的字段名称。	None
values	Any	受信任或预验证的数据字典。	{}

返回

类型	描述
Self	使用已验证的数据的 Model 类的新实例。

源代码在 pydantic/main.py 中

@classmethod
def model_construct(cls, _fields_set: set[str] | None = None, **values: Any) -> Self:  # noqa: C901
    """Creates a new instance of the `Model` class with validated data.

    Creates a new model setting `__dict__` and `__pydantic_fields_set__` from trusted or pre-validated data.
    Default values are respected, but no other validation is performed.

    !!! note
        `model_construct()` generally respects the `model_config.extra` setting on the provided model.
        That is, if `model_config.extra == 'allow'`, then all extra passed values are added to the model instance's `__dict__`
        and `__pydantic_extra__` fields. If `model_config.extra == 'ignore'` (the default), then all extra passed values are ignored.
        Because no validation is performed with a call to `model_construct()`, having `model_config.extra == 'forbid'` does not result in
        an error if extra values are passed, but they will be ignored.

    Args:
        _fields_set: A set of field names that were originally explicitly set during instantiation. If provided,
            this is directly used for the [`model_fields_set`][pydantic.BaseModel.model_fields_set] attribute.
            Otherwise, the field names from the `values` argument will be used.
        values: Trusted or pre-validated data dictionary.

    Returns:
        A new instance of the `Model` class with validated data.
    """
    m = cls.__new__(cls)
    fields_values: dict[str, Any] = {}
    fields_set = set()

    for name, field in cls.__pydantic_fields__.items():
        if field.alias is not None and field.alias in values:
            fields_values[name] = values.pop(field.alias)
            fields_set.add(name)

        if (name not in fields_set) and (field.validation_alias is not None):
            validation_aliases: list[str | AliasPath] = (
                field.validation_alias.choices
                if isinstance(field.validation_alias, AliasChoices)
                else [field.validation_alias]
            )

            for alias in validation_aliases:
                if isinstance(alias, str) and alias in values:
                    fields_values[name] = values.pop(alias)
                    fields_set.add(name)
                    break
                elif isinstance(alias, AliasPath):
                    value = alias.search_dict_for_path(values)
                    if value is not PydanticUndefined:
                        fields_values[name] = value
                        fields_set.add(name)
                        break

        if name not in fields_set:
            if name in values:
                fields_values[name] = values.pop(name)
                fields_set.add(name)
            elif not field.is_required():
                fields_values[name] = field.get_default(call_default_factory=True, validated_data=fields_values)
    if _fields_set is None:
        _fields_set = fields_set

    _extra: dict[str, Any] | None = values if cls.model_config.get('extra') == 'allow' else None
    _object_setattr(m, '__dict__', fields_values)
    _object_setattr(m, '__pydantic_fields_set__', _fields_set)
    if not cls.__pydantic_root_model__:
        _object_setattr(m, '__pydantic_extra__', _extra)

    if cls.__pydantic_post_init__:
        m.model_post_init(None)
        # update private attributes with values set
        if hasattr(m, '__pydantic_private__') and m.__pydantic_private__ is not None:
            for k, v in values.items():
                if k in m.__private_attributes__:
                    m.__pydantic_private__[k] = v

    elif not cls.__pydantic_root_model__:
        # Note: if there are any private attributes, cls.__pydantic_post_init__ would exist
        # Since it doesn't, that means that `__pydantic_private__` should be set to None
        _object_setattr(m, '__pydantic_private__', None)

    return m

model_copy

model_copy(
    *,
    update: Mapping[str, Any] | None = None,
    deep: bool = False
) -> Self

用法文档

model_copy

返回模型的副本。

注意

底层实例的 __dict__ 属性被复制。如果您在其中存储任何内容，除了模型字段之外（例如，cached properties 的值），这可能会产生意外的副作用。

参数

名称	类型	描述	默认
update	Mapping[str, Any] | None	要更改/添加到新模型中的值。注意：在创建新模型之前，数据未经过验证。您应该信任此数据。	None
deep	bool	设置为 True 以创建模型的深层副本。	False

返回

类型	描述
Self	新模型实例。

源代码在 pydantic/main.py 中

def model_copy(self, *, update: Mapping[str, Any] | None = None, deep: bool = False) -> Self:
    """!!! abstract "Usage Documentation"
        [`model_copy`](../concepts/serialization.md#model_copy)

    Returns a copy of the model.

    !!! note
        The underlying instance's [`__dict__`][object.__dict__] attribute is copied. This
        might have unexpected side effects if you store anything in it, on top of the model
        fields (e.g. the value of [cached properties][functools.cached_property]).

    Args:
        update: Values to change/add in the new model. Note: the data is not validated
            before creating the new model. You should trust this data.
        deep: Set to `True` to make a deep copy of the model.

    Returns:
        New model instance.
    """
    copied = self.__deepcopy__() if deep else self.__copy__()
    if update:
        if self.model_config.get('extra') == 'allow':
            for k, v in update.items():
                if k in self.__pydantic_fields__:
                    copied.__dict__[k] = v
                else:
                    if copied.__pydantic_extra__ is None:
                        copied.__pydantic_extra__ = {}
                    copied.__pydantic_extra__[k] = v
        else:
            copied.__dict__.update(update)
        copied.__pydantic_fields_set__.update(update.keys())
    return copied

model_dump

model_dump(
    *,
    mode: Literal["json", "python"] | str = "python",
    include: IncEx | None = None,
    exclude: IncEx | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    exclude_unset: bool = False,
    exclude_defaults: bool = False,
    exclude_none: bool = False,
    round_trip: bool = False,
    warnings: (
        bool | Literal["none", "warn", "error"]
    ) = True,
    fallback: Callable[[Any], Any] | None = None,
    serialize_as_any: bool = False
) -> dict[str, Any]

用法文档

model_dump

生成模型的字典表示，可选择指定要包含或排除的字段。

参数

名称	类型	描述	默认
mode	Literal['json', 'python'] | str	to_python 应该运行的模式。如果 mode 是 'json'，则输出将仅包含 JSON 可序列化类型。如果 mode 是 'python'，则输出可能包含非 JSON 可序列化的 Python 对象。	'python'
include	IncEx | None	要在输出中包含的字段集合。	None
exclude	IncEx | None	要从输出中排除的字段集合。	None
context	Any | None	要传递给序列化器的其他上下文。	None
by_alias	bool | None	是否在字典键中使用字段的别名（如果已定义）。	None
exclude_unset	bool	是否排除尚未显式设置的字段。	False
exclude_defaults	bool	是否排除设置为其默认值的字段。	False
exclude_none	bool	是否排除值为 None 的字段。	False
round_trip	bool	如果为 True，则转储的值应作为 Json[T] 等非幂等类型的输入有效。	False
warnings	bool | Literal['none', 'warn', 'error']	如何处理序列化错误。False/"none" 忽略它们，True/"warn" 记录错误，"error" 引发 PydanticSerializationError。	True
fallback	Callable[[Any], Any] | None	遇到未知值时要调用的函数。如果未提供，则会引发 PydanticSerializationError 错误。	None
serialize_as_any	bool	是否使用鸭子类型序列化行为序列化字段。	False

返回

类型	描述
dict[str, Any]	模型的字典表示。

源代码在 pydantic/main.py 中

def model_dump(
    self,
    *,
    mode: Literal['json', 'python'] | str = 'python',
    include: IncEx | None = None,
    exclude: IncEx | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    exclude_unset: bool = False,
    exclude_defaults: bool = False,
    exclude_none: bool = False,
    round_trip: bool = False,
    warnings: bool | Literal['none', 'warn', 'error'] = True,
    fallback: Callable[[Any], Any] | None = None,
    serialize_as_any: bool = False,
) -> dict[str, Any]:
    """!!! abstract "Usage Documentation"
        [`model_dump`](../concepts/serialization.md#modelmodel_dump)

    Generate a dictionary representation of the model, optionally specifying which fields to include or exclude.

    Args:
        mode: The mode in which `to_python` should run.
            If mode is 'json', the output will only contain JSON serializable types.
            If mode is 'python', the output may contain non-JSON-serializable Python objects.
        include: A set of fields to include in the output.
        exclude: A set of fields to exclude from the output.
        context: Additional context to pass to the serializer.
        by_alias: Whether to use the field's alias in the dictionary key if defined.
        exclude_unset: Whether to exclude fields that have not been explicitly set.
        exclude_defaults: Whether to exclude fields that are set to their default value.
        exclude_none: Whether to exclude fields that have a value of `None`.
        round_trip: If True, dumped values should be valid as input for non-idempotent types such as Json[T].
        warnings: How to handle serialization errors. False/"none" ignores them, True/"warn" logs errors,
            "error" raises a [`PydanticSerializationError`][pydantic_core.PydanticSerializationError].
        fallback: A function to call when an unknown value is encountered. If not provided,
            a [`PydanticSerializationError`][pydantic_core.PydanticSerializationError] error is raised.
        serialize_as_any: Whether to serialize fields with duck-typing serialization behavior.

    Returns:
        A dictionary representation of the model.
    """
    return self.__pydantic_serializer__.to_python(
        self,
        mode=mode,
        by_alias=by_alias,
        include=include,
        exclude=exclude,
        context=context,
        exclude_unset=exclude_unset,
        exclude_defaults=exclude_defaults,
        exclude_none=exclude_none,
        round_trip=round_trip,
        warnings=warnings,
        fallback=fallback,
        serialize_as_any=serialize_as_any,
    )

model_dump_json

model_dump_json(
    *,
    indent: int | None = None,
    include: IncEx | None = None,
    exclude: IncEx | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    exclude_unset: bool = False,
    exclude_defaults: bool = False,
    exclude_none: bool = False,
    round_trip: bool = False,
    warnings: (
        bool | Literal["none", "warn", "error"]
    ) = True,
    fallback: Callable[[Any], Any] | None = None,
    serialize_as_any: bool = False
) -> str

用法文档

model_dump_json

使用 Pydantic 的 to_json 方法生成模型的 JSON 表示。

参数

名称	类型	描述	默认
indent	int | None	要在 JSON 输出中使用的缩进。如果传递 None，则输出将是紧凑的。	None
include	IncEx | None	要在 JSON 输出中包含的字段。	None
exclude	IncEx | None	要从 JSON 输出中排除的字段。	None
context	Any | None	要传递给序列化器的其他上下文。	None
by_alias	bool | None	是否使用字段别名进行序列化。	None
exclude_unset	bool	是否排除尚未显式设置的字段。	False
exclude_defaults	bool	是否排除设置为其默认值的字段。	False
exclude_none	bool	是否排除值为 None 的字段。	False
round_trip	bool	如果为 True，则转储的值应作为 Json[T] 等非幂等类型的输入有效。	False
warnings	bool | Literal['none', 'warn', 'error']	如何处理序列化错误。False/"none" 忽略它们，True/"warn" 记录错误，"error" 引发 PydanticSerializationError。	True
fallback	Callable[[Any], Any] | None	遇到未知值时要调用的函数。如果未提供，则会引发 PydanticSerializationError 错误。	None
serialize_as_any	bool	是否使用鸭子类型序列化行为序列化字段。	False

返回

类型	描述
str	模型的 JSON 字符串表示。

源代码在 pydantic/main.py 中

def model_dump_json(
    self,
    *,
    indent: int | None = None,
    include: IncEx | None = None,
    exclude: IncEx | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    exclude_unset: bool = False,
    exclude_defaults: bool = False,
    exclude_none: bool = False,
    round_trip: bool = False,
    warnings: bool | Literal['none', 'warn', 'error'] = True,
    fallback: Callable[[Any], Any] | None = None,
    serialize_as_any: bool = False,
) -> str:
    """!!! abstract "Usage Documentation"
        [`model_dump_json`](../concepts/serialization.md#modelmodel_dump_json)

    Generates a JSON representation of the model using Pydantic's `to_json` method.

    Args:
        indent: Indentation to use in the JSON output. If None is passed, the output will be compact.
        include: Field(s) to include in the JSON output.
        exclude: Field(s) to exclude from the JSON output.
        context: Additional context to pass to the serializer.
        by_alias: Whether to serialize using field aliases.
        exclude_unset: Whether to exclude fields that have not been explicitly set.
        exclude_defaults: Whether to exclude fields that are set to their default value.
        exclude_none: Whether to exclude fields that have a value of `None`.
        round_trip: If True, dumped values should be valid as input for non-idempotent types such as Json[T].
        warnings: How to handle serialization errors. False/"none" ignores them, True/"warn" logs errors,
            "error" raises a [`PydanticSerializationError`][pydantic_core.PydanticSerializationError].
        fallback: A function to call when an unknown value is encountered. If not provided,
            a [`PydanticSerializationError`][pydantic_core.PydanticSerializationError] error is raised.
        serialize_as_any: Whether to serialize fields with duck-typing serialization behavior.

    Returns:
        A JSON string representation of the model.
    """
    return self.__pydantic_serializer__.to_json(
        self,
        indent=indent,
        include=include,
        exclude=exclude,
        context=context,
        by_alias=by_alias,
        exclude_unset=exclude_unset,
        exclude_defaults=exclude_defaults,
        exclude_none=exclude_none,
        round_trip=round_trip,
        warnings=warnings,
        fallback=fallback,
        serialize_as_any=serialize_as_any,
    ).decode()

model_json_schema classmethod

model_json_schema(
    by_alias: bool = True,
    ref_template: str = DEFAULT_REF_TEMPLATE,
    schema_generator: type[
        GenerateJsonSchema
    ] = GenerateJsonSchema,
    mode: JsonSchemaMode = "validation",
) -> dict[str, Any]

为模型类生成 JSON 模式。

参数

名称	类型	描述	默认
by_alias	bool	是否使用属性别名。	True
ref_template	str	引用模板。	DEFAULT_REF_TEMPLATE
schema_generator	type[GenerateJsonSchema]	要覆盖用于生成 JSON 模式的逻辑，作为 GenerateJsonSchema 的子类，并进行您期望的修改	GenerateJsonSchema
mode	JsonSchemaMode	生成模式的模式。	'validation'

返回

类型	描述
dict[str, Any]	给定模型类的 JSON 模式。

源代码在 pydantic/main.py 中

@classmethod
def model_json_schema(
    cls,
    by_alias: bool = True,
    ref_template: str = DEFAULT_REF_TEMPLATE,
    schema_generator: type[GenerateJsonSchema] = GenerateJsonSchema,
    mode: JsonSchemaMode = 'validation',
) -> dict[str, Any]:
    """Generates a JSON schema for a model class.

    Args:
        by_alias: Whether to use attribute aliases or not.
        ref_template: The reference template.
        schema_generator: To override the logic used to generate the JSON schema, as a subclass of
            `GenerateJsonSchema` with your desired modifications
        mode: The mode in which to generate the schema.

    Returns:
        The JSON schema for the given model class.
    """
    return model_json_schema(
        cls, by_alias=by_alias, ref_template=ref_template, schema_generator=schema_generator, mode=mode
    )

model_parametrized_name classmethod

model_parametrized_name(
    params: tuple[type[Any], ...]
) -> str

计算泛型类的参数化类名。

可以覆盖此方法，以实现泛型 BaseModel 的自定义命名方案。

参数

名称	类型	描述	默认
params	tuple[type[Any], ...]	类的类型元组。给定一个具有 2 个类型变量的泛型类 Model 和一个具体模型 Model[str, int]，值 (str, int) 将传递给 params。	required

返回

类型	描述
str	表示新类的字符串，其中 params 作为类型变量传递给 cls。

Raises

类型	描述
TypeError	尝试为非泛型模型生成具体名称时引发。

源代码在 pydantic/main.py 中

@classmethod
def model_parametrized_name(cls, params: tuple[type[Any], ...]) -> str:
    """Compute the class name for parametrizations of generic classes.

    This method can be overridden to achieve a custom naming scheme for generic BaseModels.

    Args:
        params: Tuple of types of the class. Given a generic class
            `Model` with 2 type variables and a concrete model `Model[str, int]`,
            the value `(str, int)` would be passed to `params`.

    Returns:
        String representing the new class where `params` are passed to `cls` as type variables.

    Raises:
        TypeError: Raised when trying to generate concrete names for non-generic models.
    """
    if not issubclass(cls, typing.Generic):
        raise TypeError('Concrete names should only be generated for generic models.')

    # Any strings received should represent forward references, so we handle them specially below.
    # If we eventually move toward wrapping them in a ForwardRef in __class_getitem__ in the future,
    # we may be able to remove this special case.
    param_names = [param if isinstance(param, str) else _repr.display_as_type(param) for param in params]
    params_component = ', '.join(param_names)
    return f'{cls.__name__}[{params_component}]'

model_post_init

model_post_init(context: Any) -> None

覆盖此方法以在 __init__ 和 model_construct 之后执行额外的初始化。如果您想进行一些需要整个模型初始化的验证，这将非常有用。

源代码在 pydantic/main.py 中

def model_post_init(self, context: Any, /) -> None:
    """Override this method to perform additional initialization after `__init__` and `model_construct`.
    This is useful if you want to do some validation that requires the entire model to be initialized.
    """
    pass

model_rebuild classmethod

model_rebuild(
    *,
    force: bool = False,
    raise_errors: bool = True,
    _parent_namespace_depth: int = 2,
    _types_namespace: MappingNamespace | None = None
) -> bool | None

尝试重建模型的 pydantic-core 模式。

当其中一个注解是 ForwardRef，在最初尝试构建模式期间无法解析，并且自动重建失败时，这可能是必要的。

参数

名称	类型	描述	默认
force	bool	是否强制重建模型模式，默认为 False。	False
raise_errors	bool	是否引发错误，默认为 True。	True
_parent_namespace_depth	int	父命名空间的深度级别，默认为 2。	2
_types_namespace	MappingNamespace | None	类型命名空间，默认为 None。	None

返回

类型	描述
bool | None	如果模式已“完成”且不需要重建，则返回 None。
bool | None	如果需要重建，则如果重建成功，则返回 True，否则返回 False。

源代码在 pydantic/main.py 中

@classmethod
def model_rebuild(
    cls,
    *,
    force: bool = False,
    raise_errors: bool = True,
    _parent_namespace_depth: int = 2,
    _types_namespace: MappingNamespace | None = None,
) -> bool | None:
    """Try to rebuild the pydantic-core schema for the model.

    This may be necessary when one of the annotations is a ForwardRef which could not be resolved during
    the initial attempt to build the schema, and automatic rebuilding fails.

    Args:
        force: Whether to force the rebuilding of the model schema, defaults to `False`.
        raise_errors: Whether to raise errors, defaults to `True`.
        _parent_namespace_depth: The depth level of the parent namespace, defaults to 2.
        _types_namespace: The types namespace, defaults to `None`.

    Returns:
        Returns `None` if the schema is already "complete" and rebuilding was not required.
        If rebuilding _was_ required, returns `True` if rebuilding was successful, otherwise `False`.
    """
    if not force and cls.__pydantic_complete__:
        return None

    for attr in ('__pydantic_core_schema__', '__pydantic_validator__', '__pydantic_serializer__'):
        if attr in cls.__dict__:
            # Deleting the validator/serializer is necessary as otherwise they can get reused in
            # pydantic-core. Same applies for the core schema that can be reused in schema generation.
            delattr(cls, attr)

    cls.__pydantic_complete__ = False

    if _types_namespace is not None:
        rebuild_ns = _types_namespace
    elif _parent_namespace_depth > 0:
        rebuild_ns = _typing_extra.parent_frame_namespace(parent_depth=_parent_namespace_depth, force=True) or {}
    else:
        rebuild_ns = {}

    parent_ns = _model_construction.unpack_lenient_weakvaluedict(cls.__pydantic_parent_namespace__) or {}

    ns_resolver = _namespace_utils.NsResolver(
        parent_namespace={**rebuild_ns, **parent_ns},
    )

    if not cls.__pydantic_fields_complete__:
        typevars_map = _generics.get_model_typevars_map(cls)
        try:
            cls.__pydantic_fields__ = _fields.rebuild_model_fields(
                cls,
                ns_resolver=ns_resolver,
                typevars_map=typevars_map,
            )
        except NameError as e:
            exc = PydanticUndefinedAnnotation.from_name_error(e)
            _mock_val_ser.set_model_mocks(cls, f'`{exc.name}`')
            if raise_errors:
                raise exc from e

        if not raise_errors and not cls.__pydantic_fields_complete__:
            # No need to continue with schema gen, it is guaranteed to fail
            return False

        assert cls.__pydantic_fields_complete__

    return _model_construction.complete_model_class(
        cls,
        _config.ConfigWrapper(cls.model_config, check=False),
        raise_errors=raise_errors,
        ns_resolver=ns_resolver,
    )

model_validate classmethod

model_validate(
    obj: Any,
    *,
    strict: bool | None = None,
    from_attributes: bool | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    by_name: bool | None = None
) -> Self

验证一个 pydantic 模型实例。

参数

名称	类型	描述	默认
obj	Any	要验证的对象。	required
strict	bool | None	是否严格执行类型。	None
from_attributes	bool | None	是否从对象属性中提取数据。	None
context	Any | None	要传递给验证器的其他上下文。	None
by_alias	bool | None	验证提供的输入数据时是否使用字段的别名。	None
by_name	bool | None	验证提供的输入数据时是否使用字段的名称。	None

Raises

类型	描述
ValidationError	如果对象无法验证。

返回

类型	描述
Self	已验证的模型实例。

源代码在 pydantic/main.py 中

@classmethod
def model_validate(
    cls,
    obj: Any,
    *,
    strict: bool | None = None,
    from_attributes: bool | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    by_name: bool | None = None,
) -> Self:
    """Validate a pydantic model instance.

    Args:
        obj: The object to validate.
        strict: Whether to enforce types strictly.
        from_attributes: Whether to extract data from object attributes.
        context: Additional context to pass to the validator.
        by_alias: Whether to use the field's alias when validating against the provided input data.
        by_name: Whether to use the field's name when validating against the provided input data.

    Raises:
        ValidationError: If the object could not be validated.

    Returns:
        The validated model instance.
    """
    # `__tracebackhide__` tells pytest and some other tools to omit this function from tracebacks
    __tracebackhide__ = True

    if by_alias is False and by_name is not True:
        raise PydanticUserError(
            'At least one of `by_alias` or `by_name` must be set to True.',
            code='validate-by-alias-and-name-false',
        )

    return cls.__pydantic_validator__.validate_python(
        obj, strict=strict, from_attributes=from_attributes, context=context, by_alias=by_alias, by_name=by_name
    )

model_validate_json classmethod

model_validate_json(
    json_data: str | bytes | bytearray,
    *,
    strict: bool | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    by_name: bool | None = None
) -> Self

用法文档

JSON 解析

根据 Pydantic 模型验证给定的 JSON 数据。

参数

名称	类型	描述	默认
json_data	str | bytes | bytearray	要验证的 JSON 数据。	required
strict	bool | None	是否严格执行类型。	None
context	Any | None	要传递给验证器的额外变量。	None
by_alias	bool | None	验证提供的输入数据时是否使用字段的别名。	None
by_name	bool | None	验证提供的输入数据时是否使用字段的名称。	None

返回

类型	描述
Self	已验证的 Pydantic 模型。

Raises

类型	描述
ValidationError	如果 json_data 不是 JSON 字符串或对象无法验证。

源代码在 pydantic/main.py 中

@classmethod
def model_validate_json(
    cls,
    json_data: str | bytes | bytearray,
    *,
    strict: bool | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    by_name: bool | None = None,
) -> Self:
    """!!! abstract "Usage Documentation"
        [JSON Parsing](../concepts/json.md#json-parsing)

    Validate the given JSON data against the Pydantic model.

    Args:
        json_data: The JSON data to validate.
        strict: Whether to enforce types strictly.
        context: Extra variables to pass to the validator.
        by_alias: Whether to use the field's alias when validating against the provided input data.
        by_name: Whether to use the field's name when validating against the provided input data.

    Returns:
        The validated Pydantic model.

    Raises:
        ValidationError: If `json_data` is not a JSON string or the object could not be validated.
    """
    # `__tracebackhide__` tells pytest and some other tools to omit this function from tracebacks
    __tracebackhide__ = True

    if by_alias is False and by_name is not True:
        raise PydanticUserError(
            'At least one of `by_alias` or `by_name` must be set to True.',
            code='validate-by-alias-and-name-false',
        )

    return cls.__pydantic_validator__.validate_json(
        json_data, strict=strict, context=context, by_alias=by_alias, by_name=by_name
    )

model_validate_strings classmethod

model_validate_strings(
    obj: Any,
    *,
    strict: bool | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    by_name: bool | None = None
) -> Self

根据 Pydantic 模型验证具有字符串数据的给定对象。

参数

名称	类型	描述	默认
obj	Any	包含要验证的字符串数据的对象。	required
strict	bool | None	是否严格执行类型。	None
context	Any | None	要传递给验证器的额外变量。	None
by_alias	bool | None	验证提供的输入数据时是否使用字段的别名。	None
by_name	bool | None	验证提供的输入数据时是否使用字段的名称。	None

返回

类型	描述
Self	已验证的 Pydantic 模型。

源代码在 pydantic/main.py 中

@classmethod
def model_validate_strings(
    cls,
    obj: Any,
    *,
    strict: bool | None = None,
    context: Any | None = None,
    by_alias: bool | None = None,
    by_name: bool | None = None,
) -> Self:
    """Validate the given object with string data against the Pydantic model.

    Args:
        obj: The object containing string data to validate.
        strict: Whether to enforce types strictly.
        context: Extra variables to pass to the validator.
        by_alias: Whether to use the field's alias when validating against the provided input data.
        by_name: Whether to use the field's name when validating against the provided input data.

    Returns:
        The validated Pydantic model.
    """
    # `__tracebackhide__` tells pytest and some other tools to omit this function from tracebacks
    __tracebackhide__ = True

    if by_alias is False and by_name is not True:
        raise PydanticUserError(
            'At least one of `by_alias` or `by_name` must be set to True.',
            code='validate-by-alias-and-name-false',
        )

    return cls.__pydantic_validator__.validate_strings(
        obj, strict=strict, context=context, by_alias=by_alias, by_name=by_name
    )

pydantic.create_model

create_model(
    model_name: str,
    /,
    *,
    __config__: ConfigDict | None = None,
    __doc__: str | None = None,
    __base__: None = None,
    __module__: str = __name__,
    __validators__: (
        dict[str, Callable[..., Any]] | None
    ) = None,
    __cls_kwargs__: dict[str, Any] | None = None,
    **field_definitions: Any | tuple[str, Any],
) -> type[BaseModel]

create_model(
    model_name: str,
    /,
    *,
    __config__: ConfigDict | None = None,
    __doc__: str | None = None,
    __base__: type[ModelT] | tuple[type[ModelT], ...],
    __module__: str = __name__,
    __validators__: (
        dict[str, Callable[..., Any]] | None
    ) = None,
    __cls_kwargs__: dict[str, Any] | None = None,
    **field_definitions: Any | tuple[str, Any],
) -> type[ModelT]

create_model(
    model_name: str,
    /,
    *,
    __config__: ConfigDict | None = None,
    __doc__: str | None = None,
    __base__: (
        type[ModelT] | tuple[type[ModelT], ...] | None
    ) = None,
    __module__: str | None = None,
    __validators__: (
        dict[str, Callable[..., Any]] | None
    ) = None,
    __cls_kwargs__: dict[str, Any] | None = None,
    **field_definitions: Any | tuple[str, Any],
) -> type[ModelT]

用法文档

动态模型创建

动态创建并返回一个新的 Pydantic 模型，换句话说，create_model 动态地创建 BaseModel 的子类。

参数

名称	类型	描述	默认
model_name	str	新创建的模型的名称。	required
__config__	ConfigDict | None	新模型的配置。	None
__doc__	str | None	新模型的文档字符串。	None
__base__	type[ModelT] | tuple[type[ModelT], ...] | None	新模型的基础类或基类。	None
__module__	str | None	模型所属模块的名称；如果 None，则该值取自 sys._getframe(1)	None
__validators__	dict[str, Callable[..., Any]] | None	验证字段的方法字典。键是要添加到模型中的验证方法的名称，值是验证方法本身。您可以在此处阅读有关功能验证器的更多信息。	None
__cls_kwargs__	dict[str, Any] | None	用于类创建的关键字参数字典，例如 metaclass。	None
**field_definitions	Any | tuple[str, Any]	新模型的字段定义。可以是 单个元素，表示字段的类型注解。 二元组，第一个元素是类型，第二个元素是赋值（默认值或 Field() 函数）。	{}

返回

类型	描述
type[ModelT]	新的 model。

Raises

类型	描述
PydanticUserError	如果同时传递 __base__ 和 __config__。

源代码在 pydantic/main.py 中

def create_model(  # noqa: C901
    model_name: str,
    /,
    *,
    __config__: ConfigDict | None = None,
    __doc__: str | None = None,
    __base__: type[ModelT] | tuple[type[ModelT], ...] | None = None,
    __module__: str | None = None,
    __validators__: dict[str, Callable[..., Any]] | None = None,
    __cls_kwargs__: dict[str, Any] | None = None,
    # TODO PEP 747: replace `Any` by the TypeForm:
    **field_definitions: Any | tuple[str, Any],
) -> type[ModelT]:
    """!!! abstract "Usage Documentation"
        [Dynamic Model Creation](../concepts/models.md#dynamic-model-creation)

    Dynamically creates and returns a new Pydantic model, in other words, `create_model` dynamically creates a
    subclass of [`BaseModel`][pydantic.BaseModel].

    Args:
        model_name: The name of the newly created model.
        __config__: The configuration of the new model.
        __doc__: The docstring of the new model.
        __base__: The base class or classes for the new model.
        __module__: The name of the module that the model belongs to;
            if `None`, the value is taken from `sys._getframe(1)`
        __validators__: A dictionary of methods that validate fields. The keys are the names of the validation methods to
            be added to the model, and the values are the validation methods themselves. You can read more about functional
            validators [here](https://docs.pydantic.org.cn/2.9/concepts/validators/#field-validators).
        __cls_kwargs__: A dictionary of keyword arguments for class creation, such as `metaclass`.
        **field_definitions: Field definitions of the new model. Either:

            - a single element, representing the type annotation of the field.
            - a two-tuple, the first element being the type and the second element the assigned value
              (either a default or the [`Field()`][pydantic.Field] function).

    Returns:
        The new [model][pydantic.BaseModel].

    Raises:
        PydanticUserError: If `__base__` and `__config__` are both passed.
    """
    if __base__ is not None:
        if __config__ is not None:
            raise PydanticUserError(
                'to avoid confusion `__config__` and `__base__` cannot be used together',
                code='create-model-config-base',
            )
        if not isinstance(__base__, tuple):
            __base__ = (__base__,)
    else:
        __base__ = (cast('type[ModelT]', BaseModel),)

    __cls_kwargs__ = __cls_kwargs__ or {}

    fields: dict[str, Any] = {}
    annotations: dict[str, Any] = {}

    for f_name, f_def in field_definitions.items():
        if isinstance(f_def, tuple):
            if len(f_def) != 2:
                raise PydanticUserError(
                    f'Field definition for {f_name!r} should a single element representing the type or a two-tuple, the first element '
                    'being the type and the second element the assigned value (either a default or the `Field()` function).',
                    code='create-model-field-definitions',
                )

            annotations[f_name] = f_def[0]
            fields[f_name] = f_def[1]
        else:
            annotations[f_name] = f_def

    if __module__ is None:
        f = sys._getframe(1)
        __module__ = f.f_globals['__name__']

    namespace: dict[str, Any] = {'__annotations__': annotations, '__module__': __module__}
    if __doc__:
        namespace.update({'__doc__': __doc__})
    if __validators__:
        namespace.update(__validators__)
    namespace.update(fields)
    if __config__:
        namespace['model_config'] = _config.ConfigWrapper(__config__).config_dict
    resolved_bases = types.resolve_bases(__base__)
    meta, ns, kwds = types.prepare_class(model_name, resolved_bases, kwds=__cls_kwargs__)
    if resolved_bases is not __base__:
        ns['__orig_bases__'] = __base__
    namespace.update(ns)

    return meta(
        model_name,
        resolved_bases,
        namespace,
        __pydantic_reset_parent_namespace__=False,
        _create_model_module=__module__,
        **kwds,
    )