initial commit

venv/Lib/site-packages/langgraph/constants.py

@@ -0,0 +1,64 @@
+import sys
+from typing import Any
+from warnings import warn
+
+from langgraph._internal._constants import (
+    CONF,
+    CONFIG_KEY_CHECKPOINTER,
+    TASKS,
+)
+from langgraph.warnings import LangGraphDeprecatedSinceV10
+
+__all__ = (
+    "TAG_NOSTREAM",
+    "TAG_HIDDEN",
+    "START",
+    "END",
+    # retained for backwards compatibility (mostly langgraph-api), should be removed in v2 (or earlier)
+    "CONF",
+    "TASKS",
+    "CONFIG_KEY_CHECKPOINTER",
+)
+
+# --- Public constants ---
+TAG_NOSTREAM = sys.intern("nostream")
+"""Tag to disable streaming for a chat model."""
+TAG_HIDDEN = sys.intern("langsmith:hidden")
+"""Tag to hide a node/edge from certain tracing/streaming environments."""
+END = sys.intern("__end__")
+"""The last (maybe virtual) node in graph-style Pregel."""
+START = sys.intern("__start__")
+"""The first (maybe virtual) node in graph-style Pregel."""
+
+
+def __getattr__(name: str) -> Any:
+    if name in ["Send", "Interrupt"]:
+        warn(
+            f"Importing {name} from langgraph.constants is deprecated. "
+            f"Please use 'from langgraph.types import {name}' instead.",
+            LangGraphDeprecatedSinceV10,
+            stacklevel=2,
+        )
+
+        from importlib import import_module
+
+        module = import_module("langgraph.types")
+        return getattr(module, name)
+
+    try:
+        from importlib import import_module
+
+        private_constants = import_module("langgraph._internal._constants")
+        attr = getattr(private_constants, name)
+        warn(
+            f"Importing {name} from langgraph.constants is deprecated. "
+            f"This constant is now private and should not be used directly. "
+            "Please let the LangGraph team know if you need this value.",
+            LangGraphDeprecatedSinceV10,
+            stacklevel=2,
+        )
+        return attr
+    except AttributeError:
+        pass
+
+    raise AttributeError(f"module has no attribute '{name}'")