Update app.py

app.py

@@ -42,7 +42,8 @@ import database as db  # python文件同目录下的.py程序，直接导入。
 import deta
 from langchain.chat_models import ChatOpenAI
 from llama_index import StorageContext, load_index_from_storage, GPTVectorStoreIndex, LLMPredictor, PromptHelper
-from llama_index import ServiceContext, QuestionAnswerPrompt
+# from llama_index import ServiceContext, QuestionAnswerPrompt ## QuestionAnswerPrompt在新版本中有import错。
+from llama_index import ServiceContext
 import sys
 import time
 import PyPDF2 ## read the local_KB PDF file.
@@ -305,7 +306,7 @@ def localKB_mode(username):
                 "Given all this information, please answer the following questions,"
                 "You MUST use the SAME language as the question:\n"
                 "{query_str}\n")
-                QA_PROMPT = QuestionAnswerPrompt(QA_PROMPT_TMPL)
+                # QA_PROMPT = QuestionAnswerPrompt(QA_PROMPT_TMPL)
                 # print('QA_PROMPT:', QA_PROMPT)
 
                 # llm_predictor = LLMPredictor(llm=ChatOpenAI(temperature=0.8, model_name="gpt-3.5-turbo", max_tokens=4024,streaming=True))