Update app.py

app.py

@@ -8,7 +8,10 @@ from langchain_core.runnables import RunnablePassthrough
 from langchain_text_splitters import RecursiveCharacterTextSplitter
 import bs4
 import torch
-from langchain import Client
+import getpass
+
+# Prompt the user to enter the LangChain API key
+api_key = getpass.getpass(prompt="Enter your LANGCHAIN_API_KEY: ")
 
 # Initialize LangChain client (hypothetical example)
 lc_client = Client(api_key=LANGCHAIN_API_KEY)