Update app.py

app.py

@@ -17,6 +17,7 @@ from openai import OpenAI
 from langchain.chat_models import ChatOpenAI
 # set this key as an environment variable
 os.environ["HUGGINGFACEHUB_API_TOKEN"] = st.secrets['Key2']
+os.environ["OPENAI_API_KEY"] =st.secrets['Key3']
 ###########################################################################################
 
 def get_pdf_text(pdf_docs : list) -> str: