From 3c4529ac694e317c6ca499a662ae69f6fe487e56 Mon Sep 17 00:00:00 2001
From: Devesh Rahatekar <79015420+devesh-2002@users.noreply.github.com>
Date: Wed, 20 Mar 2024 19:24:42 +0530
Subject: [PATCH] core: Updated docstring for RunnablePick (#18832)

**Description:** : Updated the docstring for RunnablePick. Added
Overview and an Example for RunnablePick class.
   **Issue:** : #18803
---
 .../langchain_core/runnables/passthrough.py   | 26 +++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/libs/core/langchain_core/runnables/passthrough.py b/libs/core/langchain_core/runnables/passthrough.py
index f3d4e5f78d..6b1b9ad564 100644
--- a/libs/core/langchain_core/runnables/passthrough.py
+++ b/libs/core/langchain_core/runnables/passthrough.py
@@ -610,8 +610,30 @@ class RunnableAssign(RunnableSerializable[Dict[str, Any], Dict[str, Any]]):
 
 
 class RunnablePick(RunnableSerializable[Dict[str, Any], Dict[str, Any]]):
-    """
-    Runnable that picks keys from Dict[str, Any] inputs.
+    """Runnable that picks keys from Dict[str, Any] inputs.
+
+    RunnablePick class represents a runnable that selectively picks keys from a
+    dictionary input. It allows you to specify one or more keys to extract
+    from the input dictionary. It returns a new dictionary containing only
+    the selected keys.
+
+    Example :
+        .. code-block:: python
+
+            from langchain_core.runnables.passthrough import RunnablePick
+
+            input_data = {
+                'name': 'John',
+                'age': 30,
+                'city': 'New York',
+                'country': 'USA'
+            }
+
+            runnable = RunnablePick(keys=['name', 'age'])
+
+            output_data = runnable.invoke(input_data)
+
+            print(output_data)  # Output: {'name': 'John', 'age': 30}
     """
 
     keys: Union[str, List[str]]