Update app.py

app.py

@@ -10,6 +10,8 @@ from langchain.prompts.chat import ChatPromptTemplate, MessagesPlaceholder
 from langchain_core.messages import HumanMessage, AIMessage
 from langchain.schema.output_parser import StrOutputParser
 
+import os
+
 st.set_page_config(page_title="ITC Financial Analysis ChatBot", layout="centered")
 
 # API key