codekingpro/portable-devtools

1import sys2from typing import Any3from warnings import warn4 5from langgraph._internal._constants import (6    CONF,7    CONFIG_KEY_CHECKPOINTER,8    TASKS,9)10from langgraph.warnings import LangGraphDeprecatedSinceV1011 12__all__ = (13    "TAG_NOSTREAM",14    "TAG_HIDDEN",15    "START",16    "END",17    # retained for backwards compatibility (mostly langgraph-api), should be removed in v2 (or earlier)18    "CONF",19    "TASKS",20    "CONFIG_KEY_CHECKPOINTER",21)22 23# --- Public constants ---24TAG_NOSTREAM = sys.intern("nostream")25"""Tag to disable streaming for a chat model."""26TAG_HIDDEN = sys.intern("langsmith:hidden")27"""Tag to hide a node/edge from certain tracing/streaming environments."""28END = sys.intern("__end__")29"""The last (maybe virtual) node in graph-style Pregel."""30START = sys.intern("__start__")31"""The first (maybe virtual) node in graph-style Pregel."""32 33 34def __getattr__(name: str) -> Any:35    if name in ["Send", "Interrupt"]:36        warn(37            f"Importing {name} from langgraph.constants is deprecated. "38            f"Please use 'from langgraph.types import {name}' instead.",39            LangGraphDeprecatedSinceV10,40            stacklevel=2,41        )42 43        from importlib import import_module44 45        module = import_module("langgraph.types")46        return getattr(module, name)47 48    try:49        from importlib import import_module50 51        private_constants = import_module("langgraph._internal._constants")52        attr = getattr(private_constants, name)53        warn(54            f"Importing {name} from langgraph.constants is deprecated. "55            f"This constant is now private and should not be used directly. "56            "Please let the LangGraph team know if you need this value.",57            LangGraphDeprecatedSinceV10,58            stacklevel=2,59        )60        return attr61    except AttributeError:62        pass63 64    raise AttributeError(f"module has no attribute '{name}'")65