Update app.py

app.py

@@ -38,13 +38,13 @@ class ChatWrapper:
                 vectorstore = pickle.load(f)
             os.environ["OPENAI_API_KEY"] = api_key   
             qa_chain = get_chain(vectorstore)
-            chat_history = []
             print("Chat with your docs!")
             while True:
                 print("Human:")
+                history = history or []
                 import openai
                 openai.api_key = api_key
-                output = qa_chain({"question": inp, "chat_history": history})
+                output = qa_chain({"question": inp, "chat_history": history})["answer"]
                 history.append((inp, output))
                 print("AI:")
                 print(output["answer"])