Update app.py

app.py

@@ -1,3 +1,8 @@
+from langchain.chains import llm
+from ast import Index
+from gpt_index import SimpleDirectoryReader, GPTListIndex, readers, GPTSimpleVectorIndex, LLMPredictor, PromptHelper
+from langchain import OpenAI
+
 def ask_patrick():
     index = GPTSimpleVectorIndex.load_from_disk('index.json')
     while True: