diff --git a/README.md b/README.md
index 3b3fceb36..bceec868b 100644
--- a/README.md
+++ b/README.md
@@ -275,8 +275,7 @@ In above example, the server uses the chat template specified in the model token
 You can override the chat template if needed when launching the server:
 
 ```
-python -m sglang.launch_server --model-path meta-llama/Llama-2-7b-chat-hf --port 30000
---chat-template llama-2
+python -m sglang.launch_server --model-path meta-llama/Llama-2-7b-chat-hf --port 30000 --chat-template llama-2
 ```
 
 If the chat template you are looking for is missing, you are welcome to contribute it.
@@ -295,8 +294,7 @@ Meanwhile, you can also temporary register your chat template as follows:
 ```
 
 ```
-python -m sglang.launch_server --model-path meta-llama/Llama-2-7b-chat-hf --port 30000
---chat-template ./my_model_template.json
+python -m sglang.launch_server --model-path meta-llama/Llama-2-7b-chat-hf --port 30000 --chat-template ./my_model_template.json
 ```
 
 ### Additional Arguments
diff --git a/python/sglang/srt/conversation.py b/python/sglang/srt/conversation.py
index 41d153fd4..92d999770 100644
--- a/python/sglang/srt/conversation.py
+++ b/python/sglang/srt/conversation.py
@@ -1,10 +1,11 @@
 # Adapted from
 # https://github.com/lm-sys/FastChat/blob/main/fastchat/conversation.py
-from sglang.srt.managers.openai_protocol import ChatCompletionRequest
-from enum import IntEnum, auto
 import dataclasses
+from enum import IntEnum, auto
 from typing import Dict, List, Tuple, Union
 
+from sglang.srt.managers.openai_protocol import ChatCompletionRequest
+
 
 class SeparatorStyle(IntEnum):
     """Separator styles."""
@@ -109,7 +110,11 @@ class Conversation:
             ret = system_prompt
             for i, (role, message) in enumerate(self.messages):
                 if message:
-                    ret += role + ": " + message.replace("\r\n", "\n").replace("\n\n", "\n")
+                    ret += (
+                        role
+                        + ": "
+                        + message.replace("\r\n", "\n").replace("\n\n", "\n")
+                    )
                     ret += "\n\n"
                 else:
                     ret += role + ":"
@@ -310,7 +315,9 @@ chat_templates: Dict[str, Conversation] = {}
 def register_conv_template(template: Conversation, override: bool = False):
     """Register a new conversation template."""
     if not override:
-        assert template.name not in chat_templates, f"{template.name} has been registered."
+        assert (
+            template.name not in chat_templates
+        ), f"{template.name} has been registered."
 
     chat_templates[template.name] = template
 
@@ -319,7 +326,9 @@ def chat_template_exists(template_name: str) -> bool:
     return template_name in chat_templates
 
 
-def generate_chat_conv(request: ChatCompletionRequest, template_name: str) -> Conversation:
+def generate_chat_conv(
+    request: ChatCompletionRequest, template_name: str
+) -> Conversation:
     conv = chat_templates[template_name].copy()
     conv = Conversation(
         name=conv.name,
diff --git a/python/sglang/srt/server.py b/python/sglang/srt/server.py
index 320c0e86a..c5bbe0674 100644
--- a/python/sglang/srt/server.py
+++ b/python/sglang/srt/server.py
@@ -224,7 +224,9 @@ async def v1_chat_completions(raw_request: Request):
                         finish_reason=None,
                     )
                     chunk = ChatCompletionStreamResponse(
-                        id=content["meta_info"]["id"], choices=[choice_data], model=request.model
+                        id=content["meta_info"]["id"],
+                        choices=[choice_data],
+                        model=request.model,
                     )
                     yield f"data: {chunk.json(exclude_unset=True, ensure_ascii=False)}\n\n"
 
@@ -235,7 +237,9 @@ async def v1_chat_completions(raw_request: Request):
                     index=0, delta=DeltaMessage(content=delta), finish_reason=None
                 )
                 chunk = ChatCompletionStreamResponse(
-                    id=content["meta_info"]["id"], choices=[choice_data], model=request.model
+                    id=content["meta_info"]["id"],
+                    choices=[choice_data],
+                    model=request.model,
                 )
                 yield f"data: {chunk.json(exclude_unset=True, ensure_ascii=False)}\n\n"
             yield "data: [DONE]\n\n"
@@ -293,7 +297,9 @@ def launch_server(server_args, pipe_finish_writer):
                 try:
                     sep_style = SeparatorStyle[template["sep_style"]]
                 except KeyError:
-                    raise ValueError(f"Unknown separator style: {template['sep_style']}") from None
+                    raise ValueError(
+                        f"Unknown separator style: {template['sep_style']}"
+                    ) from None
                 register_conv_template(
                     Conversation(
                         name=template["name"],