Merge pull request #2492 from langchain-ai/wfh/accept_313

[CLI] Accept 3.13 in build

libs/cli/langgraph_cli/cli.py

@@ -45,7 +45,7 @@
     - "graphs": mapping from graph ID to path where the compiled graph is defined, i.e. ./your_package/your_file.py:variable, where
         "variable" is an instance of langgraph.graph.graph.CompiledGraph
     - "env": (optional) path to .env file or a mapping from environment variable to its value
-    - "python_version": (optional) 3.11 or 3.12. Defaults to 3.11
+    - "python_version": (optional) 3.11, 3.12, or 3.13. Defaults to 3.11
     - "pip_config_file": (optional) path to pip config file
     - "dockerfile_lines": (optional) array of additional lines to add to Dockerfile following the import from parent image
 

libs/cli/langgraph_cli/config.py

@@ -17,6 +17,18 @@ class Config(TypedDict):
     env: Union[dict[str, str], str]
 
 
+MIN_PYTHON_VERSION = "3.11"
+
+
+def _parse_version(version_str: str) -> tuple[int, int]:
+    """Parse a version string into a tuple of (major, minor)."""
+    try:
+        major, minor = map(int, version_str.split("."))
+        return (major, minor)
+    except ValueError:
+        raise click.UsageError(f"Invalid version format: {version_str}") from None
+
+
 def validate_config(config: Config) -> Config:
     config = (
         {
@@ -44,14 +56,21 @@ def validate_config(config: Config) -> Config:
             )
 
     if config.get("python_version"):
-        if config["python_version"] not in (
-            "3.11",
-            "3.12",
+        pyversion = config["python_version"]
+        if not pyversion.count(".") == 1 or not all(
+            part.isdigit() for part in pyversion.split(".")
         ):
             raise click.UsageError(
-                f"Unsupported Python version: {config['python_version']}. "
-                "Supported versions are 3.11 and 3.12."
+                f"Invalid Python version format: {pyversion}. "
+                "Use 'major.minor' format (e.g., '3.11'). "
+                "Patch version cannot be specified."
             )
+        if _parse_version(pyversion) < _parse_version(MIN_PYTHON_VERSION):
+            raise click.UsageError(
+                f"Python version {pyversion} is not supported. "
+                f"Minimum required version is {MIN_PYTHON_VERSION}."
+            )
+
         if not config["dependencies"]:
             raise click.UsageError(
                 "No dependencies found in config. "

libs/cli/tests/unit_tests/test_config.py

@@ -42,6 +42,9 @@ def test_validate_config():
     }
     actual_config = validate_config(expected_config)
     assert actual_config == expected_config
+    expected_config["python_version"] = "3.13"
+    actual_config = validate_config(expected_config)
+    assert actual_config == expected_config
 
     # check wrong python version raises
     with pytest.raises(click.UsageError):
@@ -61,6 +64,22 @@ def test_validate_config():
     with pytest.raises(click.UsageError):
         validate_config({"python_version": "3.9", "dependencies": ["."]})
 
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config({"python_version": "3.11.0"})
+    assert "Invalid Python version format" in str(exc_info.value)
+
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config({"python_version": "3"})
+    assert "Invalid Python version format" in str(exc_info.value)
+
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config({"python_version": "abc.def"})
+    assert "Invalid Python version format" in str(exc_info.value)
+
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config({"python_version": "3.10"})
+    assert "Minimum required version" in str(exc_info.value)
+
 
 # config_to_docker
 def test_config_to_docker_simple():