none_schema

Returns a schema that matches a None value, e.g.:

from pydantic_core import SchemaValidator, core_schema

schema = core_schema.none_schema()
v = SchemaValidator(schema)
assert v.validate_python(None) is None

def none_schema(
    ref: str | None = None,
    metadata: dict[str, Any] | None = None,
    serialization: SerSchema | None = None
) - > NoneSchema

Returns a schema that matches a None value.

Parameters

Name	Type	Description
ref	`str	None` = None
metadata	`dict[str, Any]	None` = None
serialization	`SerSchema	None` = None

Returns

Type	Description
NoneSchema	A core schema object that validates and serializes None values.