Update app.py

app.py

@@ -10,6 +10,7 @@ from langchain.chains.combine_documents import create_stuff_documents_chain
 from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain_core.messages import HumanMessage, AIMessage
 from langchain.memory import ConversationBufferMemory
+from langchain.document_loaders import PyPDFLoader
 
 # Set page config
 st.set_page_config(page_title="Tbank Assistant", layout="wide")