diff --git a/devchat/openai/openai_chat.py b/devchat/openai/openai_chat.py
index 515272a0..757574d7 100644
--- a/devchat/openai/openai_chat.py
+++ b/devchat/openai/openai_chat.py
@@ -1,4 +1,4 @@
-from typing import Any, Optional, Union, List, Dict, Iterator
+from typing import Optional, Union, List, Dict, Iterator
 from pydantic import BaseModel, Field, Extra
 import openai
 from devchat.chat import Chat
diff --git a/devchat/openai/openai_prompt.py b/devchat/openai/openai_prompt.py
index 03741961..46c5b5f4 100644
--- a/devchat/openai/openai_prompt.py
+++ b/devchat/openai/openai_prompt.py
@@ -100,16 +100,16 @@ def append_new(self, message_type: str, content: str,
         self._new_messages[message_type].append(message)
         self._request_tokens += num_tokens
         return True
-    
+
     def set_functions(self, functions, available_tokens: int = math.inf):
         num_tokens = message_tokens({"functions": json.dumps(functions)}, self.model)
         if num_tokens > available_tokens:
             return False
-        
+
         self._new_messages[Message.FUNCTION] = functions
         self._request_tokens += num_tokens
         return True
-        
+
     def get_functions(self):
         return self._new_messages.get(Message.FUNCTION, None)