Update app.py

app.py

@@ -37,7 +37,7 @@ class ChatWrapper:
                 return history, history
             # Set OpenAI key
             import openai
-            openai.api_key = api_key
+            openai.api_key = os.environ["OPENAI_API_KEY"]#api_key
             # Run chain and append input.
             output = chain({"question": inp, "chat_history": history})["answer"]
             history.append((inp, output))