venv/lib/python3.12/site-packages/langchain/callbacks/human.py

from typing import TYPE_CHECKING, Any

from langchain._api import create_importer

if TYPE_CHECKING:
    from langchain_community.callbacks.human import (
        AsyncHumanApprovalCallbackHandler,
        HumanApprovalCallbackHandler,
        HumanRejectedException,
    )

# Create a way to dynamically look up deprecated imports.
# Used to consolidate logic for raising deprecation warnings and
# handling optional imports.
DEPRECATED_LOOKUP = {
    "HumanRejectedException": "langchain_community.callbacks.human",
    "HumanApprovalCallbackHandler": "langchain_community.callbacks.human",
    "AsyncHumanApprovalCallbackHandler": "langchain_community.callbacks.human",
}

_import_attribute = create_importer(__file__, deprecated_lookups=DEPRECATED_LOOKUP)


def __getattr__(name: str) -> Any:
    """Look up attributes dynamically."""
    return _import_attribute(name)


__all__ = [
    "HumanRejectedException",
    "HumanApprovalCallbackHandler",
    "AsyncHumanApprovalCallbackHandler",
]