Update app.py

app.py

@@ -8,7 +8,7 @@ from langchain.vectorstores import FAISS
 from langchain_google_genai import ChatGoogleGenerativeAI
 from langchain.chains.question_answering import load_qa_chain
 from langchain.prompts import PromptTemplate
-
+import os 
 
 st.set_page_config(page_title="RAG Demo - Evan Perez", layout ="wide")