Errors

Pydantic-specific errors.

PydanticErrorMixin

PydanticErrorMixin(
    message: str, *, code: PydanticErrorCodes | None
)

A mixin class for common functionality shared by all Pydantic-specific errors.

Attributes:

Name	Type	Description
message		A message describing the error.
code		An optional error code from PydanticErrorCodes enum.

Source code in pydantic/errors.py

def __init__(self, message: str, *, code: PydanticErrorCodes | None) -> None:
    self.message = message
    self.code = code

PydanticUserError

PydanticUserError(
    message: str, *, code: PydanticErrorCodes | None
)

Bases: PydanticErrorMixin, RuntimeError

An error raised due to incorrect use of Pydantic.

Source code in pydantic/errors.py

def __init__(self, message: str, *, code: PydanticErrorCodes | None) -> None:
    self.message = message
    self.code = code

PydanticUndefinedAnnotation

PydanticUndefinedAnnotation(name: str | None, message: str)

Bases: PydanticErrorMixin, NameError

A subclass of NameError raised when handling undefined annotations during CoreSchema generation.

Attributes:

Name	Type	Description
name		Name of the error, of None if not available.
message		Description of the error.

Source code in pydantic/errors.py

def __init__(self, name: str | None, message: str) -> None:
    self.name = name
    super().__init__(message=message, code='undefined-annotation')

from_name_error classmethod

from_name_error(name_error: NameError) -> Self

Convert a NameError to a PydanticUndefinedAnnotation error.

Parameters:

Name	Type	Description	Default
name_error	NameError	NameError to be converted.	required

Returns:

Type	Description
Self	Converted PydanticUndefinedAnnotation error.

Source code in pydantic/errors.py

@classmethod
def from_name_error(cls, name_error: NameError) -> Self:
    """Convert a `NameError` to a `PydanticUndefinedAnnotation` error.

    Args:
        name_error: `NameError` to be converted.

    Returns:
        Converted `PydanticUndefinedAnnotation` error.
    """
    return cls(name=name_error.name, message=str(name_error))

PydanticImportError

PydanticImportError(message: str)

Bases: PydanticErrorMixin, ImportError

An error raised when an import fails due to module changes between V1 and V2.

Attributes:

Name	Type	Description
message		Description of the error.

Source code in pydantic/errors.py

def __init__(self, message: str) -> None:
    super().__init__(message, code='import-error')

PydanticSchemaGenerationError

PydanticSchemaGenerationError(message: str)

Bases: PydanticUserError

An error raised during failures to generate a CoreSchema for some type.

Attributes:

Name	Type	Description
message		Description of the error.

Source code in pydantic/errors.py

def __init__(self, message: str) -> None:
    super().__init__(message, code='schema-for-unknown-type')

PydanticInvalidForJsonSchema

PydanticInvalidForJsonSchema(message: str)

Bases: PydanticUserError

An error raised during failures to generate a JSON schema for some CoreSchema.

Attributes:

Name	Type	Description
message		Description of the error.

Source code in pydantic/errors.py

def __init__(self, message: str) -> None:
    super().__init__(message, code='invalid-for-json-schema')

PydanticForbiddenQualifier

PydanticForbiddenQualifier(
    qualifier: Qualifier, annotation: Any
)

Bases: PydanticUserError

An error raised if a forbidden type qualifier is found in a type annotation.

Source code in pydantic/errors.py

def __init__(self, qualifier: Qualifier, annotation: Any) -> None:
    super().__init__(
        message=(
            f'The annotation {_repr.display_as_type(annotation)!r} contains the {self._qualifier_repr_map[qualifier]!r} '
            f'type qualifier, which is invalid in the context it is defined.'
        ),
        code=None,
    )