Update app.py

app.py

@@ -8,7 +8,7 @@ from langchain_community.chat_message_histories import ChatMessageHistory
 from langchain.memory import ConversationBufferMemory
 from langchain_core.prompts import PromptTemplate
 import streamlit as st
-
+import os
 
 # Access the OpenAI API key from the environment
 open_ai_key = os.getenv("OPENAI_API_KEY")