Update app.py

app.py

@@ -21,6 +21,8 @@ import pandas as pd
 from langchain.agents import create_pandas_dataframe_agent
 from langchain.agents import ZeroShotAgent, Tool, AgentExecutor
 from langchain import OpenAI, LLMChain
+from langchain.agents.agent_types import AgentType
+from langchain.agents import create_csv_agent
 
 class ChatDocumentQA:
     def __init__(self) -> None: