is_instance_schema

Returns a schema that checks if a value is an instance of a class, equivalent to python's isinstance method, e.g.:

from pydantic_core import SchemaValidator, core_schema

class A:
    pass

schema = core_schema.is_instance_schema(cls=A)
v = SchemaValidator(schema)
v.validate_python(A())

def is_instance_schema(
    cls: Any,
    cls_repr: str | None = None,
    ref: str | None = None,
    metadata: dict[str, Any] | None = None,
    serialization: SerSchema | None = None
) - > IsInstanceSchema

Returns a schema that checks if a value is an instance of a class, equivalent to python's isinstance method.

Parameters

Name	Type	Description
cls	Any	The class type that the input value must be an instance of.
cls_repr	`str	None` = None
ref	`str	None` = None
metadata	`dict[str, Any]	None` = None
serialization	`SerSchema	None` = None

Returns

Type	Description
IsInstanceSchema	A dictionary-based schema configuration used by pydantic-core to perform instance checks during validation.