core[minor]: Support multiple keys in get_from_dict_or_env (#23086)

Support passing multiple keys for ge_from_dict_or_env

libs/core/tests/unit_tests/utils/test_env.py

@@ -0,0 +1,64 @@
+import pytest
+
+from langchain_core.utils.env import get_from_dict_or_env
+
+
+def test_get_from_dict_or_env() -> None:
+    assert (
+        get_from_dict_or_env(
+            {
+                "a": "foo",
+            },
+            ["a"],
+            "__SOME_KEY_IN_ENV",
+        )
+        == "foo"
+    )
+
+    assert (
+        get_from_dict_or_env(
+            {
+                "a": "foo",
+            },
+            ["b", "a"],
+            "__SOME_KEY_IN_ENV",
+        )
+        == "foo"
+    )
+
+    assert (
+        get_from_dict_or_env(
+            {
+                "a": "foo",
+            },
+            "a",
+            "__SOME_KEY_IN_ENV",
+        )
+        == "foo"
+    )
+
+    assert (
+        get_from_dict_or_env(
+            {
+                "a": "foo",
+            },
+            "not exists",
+            "__SOME_KEY_IN_ENV",
+            default="default",
+        )
+        == "default"
+    )
+
+    # Not the most obvious behavior, but
+    # this is how it works right now
+    with pytest.raises(ValueError):
+        assert (
+            get_from_dict_or_env(
+                {
+                    "a": "foo",
+                },
+                "not exists",
+                "__SOME_KEY_IN_ENV",
+            )
+            is None
+        )