diff --git a/lmdeploy/model.py b/lmdeploy/model.py
index 6eec89b7b4..1916a77870 100644
--- a/lmdeploy/model.py
+++ b/lmdeploy/model.py
@@ -891,27 +891,29 @@ def match(cls, model_path: str) -> Optional[str]:
         ) or 'llama3.2-' in model_path.lower():
             return 'llama3_1'
 
+
 @MODELS.register_module(name='qwen2d5')
 class Qwen2halfChat(BaseChatTemplate):
     """Chat template for Qwen-7B-Chat."""
 
-    def __init__(self,
-                 system='<|im_start|>system\n',
-                 meta_instruction='You are Qwen, created by Alibaba Cloud. You are a helpful assistant.',
-                 eosys='<|im_end|>\n',
-                 user='<|im_start|>user\n',
-                 eoh='<|im_end|>\n',
-                 assistant='<|im_start|>assistant\n',
-                 eoa='<|im_end|>',
-                 separator='\n',
-                 tools="""
+    def __init__(
+            self,
+            system='<|im_start|>system\n',
+            meta_instruction='You are Qwen, created by Alibaba Cloud. You are a helpful assistant.',
+            eosys='<|im_end|>\n',
+            user='<|im_start|>user\n',
+            eoh='<|im_end|>\n',
+            assistant='<|im_start|>assistant\n',
+            eoa='<|im_end|>',
+            separator='\n',
+            tools="""
                      \n\n#Tools\n\nYou may call one or more functions to assist with the user query.\n\nYou are provided with function signatures within <tools></tools> XML tags:\n<tools>
                     """,
-                 eotools="""
+            eotools="""
                     \n\n</tools>\n\nFor each function call, return a json object with function name and arguments within <tool_call></tool_call> XML tags:\n<tool_call>\n{"name": <function-name>, "arguments": <args-json-object>}\n</tool_call><|im_end|>\
                     """,
-                 stop_words=['<|im_end|>'],
-                 **kwargs):
+            stop_words=['<|im_end|>'],
+            **kwargs):
 
         self.tools = tools
         self.eotools = eotools
@@ -925,11 +927,15 @@ def __init__(self,
                          separator=separator,
                          stop_words=stop_words,
                          **kwargs)
-    def messages2prompt(self, messages, sequence_start=True,
-                        tools=None,  **kwargs):
 
+    def messages2prompt(self,
+                        messages,
+                        sequence_start=True,
+                        tools=None,
+                        **kwargs):
         """Return the prompt that is concatenated with other elements in the
         chat template.
+
         Args:
             messages (str | List): user's input prompt
         Returns:
@@ -948,16 +954,19 @@ def messages2prompt(self, messages, sequence_start=True,
             if len(messages) and messages[0]['role'] == 'system':
                 ret += f"{messages[0]['content']}{self.tools}{tool_prompt}{self.eotools}{self.meta_instruction}{self.eosys}"
             else:
-                ret += f"{self.system}{self.meta_instruction}{self.tools}{tool_prompt}{self.eotools}{self.eosys}"
+                ret += f'{self.system}{self.meta_instruction}{self.tools}{tool_prompt}{self.eotools}{self.eosys}'
         else:
             if self.meta_instruction is not None and sequence_start:
                 if len(messages) and messages[0]['role'] == 'system':
                     ret += f"{self.system}{messages[0]['content']}{self.eosys}"
                 else:
-                    ret += f"{self.system}{self.meta_instruction}{self.eosys}"
+                    ret += f'{self.system}{self.meta_instruction}{self.eosys}'
 
         for index, message in enumerate(messages):
-            if (message['role'] == 'user' or (message['role'] == 'system' and index != 0) or (message['role'] == 'assistant' and message['tools_call'] is not None)):
+            if (message['role'] == 'user'
+                    or (message['role'] == 'system' and index != 0)
+                    or (message['role'] == 'assistant'
+                        and message['tools_call'] is not None)):
                 ret += f"{box_map[message['role']]}\n{message['content']}\n{self.eoh}"
             if message['role'] == 'assistant':
                 ret += f"{box_map[message['role']]}"
@@ -971,10 +980,11 @@ def messages2prompt(self, messages, sequence_start=True,
                     ret += f'\n<tool_call>\n{{"name": "{toolCall["name"]}, "arguments": {json.dumps(tools["arguments"])}"\n</toolcall>}}'
             if message['role'] == 'tool':
                 if index == 0 or messages[index - 1]['role'] != 'tool':
-                    ret += f"{self.user}"
+                    ret += f'{self.user}'
                 ret += f"\n<tool_response>\n{message['content']}\n</tool_response>"
-                if index == len(messages) - 1 or messages[index + 1]['role'] != 'tool':
-                    ret += f"{self.eoh}"
+                if index == len(messages) - 1 or messages[index +
+                                                          1]['role'] != 'tool':
+                    ret += f'{self.eoh}'
         ret += f'{self.assistant}'
         return ret
 
@@ -988,6 +998,7 @@ def match(cls, model_path: str) -> Optional[str]:
         if 'qwen2.5' in model_path.lower():
             return 'qwen2d5'
 
+
 @MODELS.register_module(name='minicpmv-2d6')
 @MODELS.register_module(name='minicpm3')
 @MODELS.register_module(name='qwen')
@@ -1023,7 +1034,8 @@ def match(cls, model_path: str) -> Optional[str]:
         Args:
             model_path (str): the model path used for matching.
         """
-        if 'qwen' in model_path.lower() and 'qwen2.5' not in model_path.lower():
+        if 'qwen' in model_path.lower() and 'qwen2.5' not in model_path.lower(
+        ):
             return 'qwen'
         if 'minicpm-v-2_6' in model_path.lower():
             return 'minicpmv-2d6'
diff --git a/lmdeploy/serve/openai/api_server.py b/lmdeploy/serve/openai/api_server.py
index e0708dec08..3a90f7e634 100644
--- a/lmdeploy/serve/openai/api_server.py
+++ b/lmdeploy/serve/openai/api_server.py
@@ -495,9 +495,8 @@ async def completion_stream_generator() -> AsyncGenerator[str, None]:
             final_logprobs.extend(res.logprobs)
 
     tool_calls = None
-    if request.tool_choice != 'none' and ('<|plugin|>' in text
-                                          or '<function=' in text
-                                          or '<tool_call>' in text):
+    if request.tool_choice != 'none' and ('<|plugin|>' in text or '<function='
+                                          in text or '<tool_call>' in text):
         if final_res.finish_reason == 'stop':
             final_res.finish_reason = 'tool_calls'
         try:  # TODO add json_schema guidance to turbomind