release(langchain): v1.0.0a1 (#32718)

Also removing globals usage + static version

libs/langchain_v1/langchain/__init__.py

@@ -1,18 +1,15 @@
-"""Main entrypoint into package."""
+"""Main entrypoint into LangChain."""
 
-from importlib import metadata
 from typing import Any
 
-try:
+__version__ = "1.0.0a1"
-    __version__ = metadata.version(__package__)
-except metadata.PackageNotFoundError:
-    # Case where package metadata is not available.
-    __version__ = ""
-del metadata  # optional, avoids polluting the results of dir(__package__)
 
 
 def __getattr__(name: str) -> Any:  # noqa: ANN401
-    """Get an attribute from the package."""
+    """Get an attribute from the package.
+
+    TODO: will be removed in a future alpha version.
+    """
     if name == "verbose":
         from langchain.globals import _verbose
 

libs/langchain_v1/langchain/globals.py

@@ -0,0 +1,18 @@
+"""Global values and configuration that apply to all of LangChain.
+
+TODO: will be removed in a future alpha version.
+"""
+
+from typing import TYPE_CHECKING, Optional
+
+if TYPE_CHECKING:
+    from langchain_core.caches import BaseCache
+
+
+# DO NOT USE THESE VALUES DIRECTLY!
+# Use them only via `get_<X>()` and `set_<X>()` below,
+# or else your code may behave unexpectedly with other uses of these global settings:
+# https://github.com/langchain-ai/langchain/pull/11311#issuecomment-1743780004
+_verbose: bool = False
+_debug: bool = False
+_llm_cache: Optional["BaseCache"] = None

libs/langchain_v1/pyproject.toml

@@ -12,13 +12,16 @@ dependencies = [
     "langgraph>=0.6.0",
     "pydantic>=2.7.4",
 ]
-
+dynamic = ["version"]
 
 name = "langchain"
-version = "1.0.0dev1"
 description = "Building applications with LLMs through composability"
 readme = "README.md"
 
+[tool.pdm.version]
+source = "file"
+path = "langchain/__init__.py"
+
 [project.optional-dependencies]
 # community = ["langchain-community"]
 anthropic = ["langchain-anthropic"]