_function_annotations_are_pydantic_v1() — langchain Function Reference

Source Code

libs/core/langchain_core/tools/base.py lines 247–276

def _function_annotations_are_pydantic_v1(
    signature: inspect.Signature, func: Callable
) -> bool:
    """Check if all Pydantic annotations in a function are from v1.

    Args:
        signature: The function signature to check.
        func: The function being checked.

    Returns:
        True if all Pydantic annotations are from v1, `False` otherwise.

    Raises:
        NotImplementedError: If the function contains mixed v1 and v2 annotations.
    """
    any_v1_annotations = any(
        _is_pydantic_annotation(parameter.annotation, pydantic_version="v1")
        for parameter in signature.parameters.values()
    )
    any_v2_annotations = any(
        _is_pydantic_annotation(parameter.annotation, pydantic_version="v2")
        for parameter in signature.parameters.values()
    )
    if any_v1_annotations and any_v2_annotations:
        msg = (
            f"Function {func} contains a mix of Pydantic v1 and v2 annotations. "
            "Only one version of Pydantic annotations per function is supported."
        )
        raise NotImplementedError(msg)
    return any_v1_annotations and not any_v2_annotations