Update app.py

app.py

@@ -1,10 +1,12 @@
-import os
 import streamlit as st
-from PyPDF2 import PdfReader
-from langchain import LLMChain
+import os
 from streamlit_chat import message
+from PyPDF2 import PdfReader
 import google.generativeai as genai
 from langchain.prompts import PromptTemplate
+from langchain_community.document_loaders import PyPDFLoader
+from langchain import LLMChain
+from langchain.memory import ConversationBufferMemory
 from langchain_google_genai import ChatGoogleGenerativeAI
 
 os.environ["GOOGLE_API_KEY"] = os.getenv("GOOGLE_API_KEY")