diff --git a/README.md b/README.md
index 6881fec25..a151a1f0f 100644
--- a/README.md
+++ b/README.md
@@ -185,4 +185,3 @@ ## Citation
       primaryClass={cs.AI}
 }
 ```
-
diff --git a/metagpt/provider/general_api_requestor.py b/metagpt/provider/general_api_requestor.py
index b65ef0de6..501a064e3 100644
--- a/metagpt/provider/general_api_requestor.py
+++ b/metagpt/provider/general_api_requestor.py
@@ -82,9 +82,7 @@ class GeneralAPIRequestor(APIRequestor):
     ) -> Tuple[Union[bytes, AsyncGenerator[bytes, None]], bool]:
         content_type = result.headers.get("Content-Type", "")
         if stream and (
-                "text/event-stream" in content_type or
-                "application/x-ndjson" in content_type or
-                content_type == ''
+            "text/event-stream" in content_type or "application/x-ndjson" in content_type or content_type == ""
         ):
             # the `Content-Type` of ollama stream resp is "application/x-ndjson"
             return (
diff --git a/metagpt/provider/ollama_api.py b/metagpt/provider/ollama_api.py
index 047d6950d..454f0e3ee 100644
--- a/metagpt/provider/ollama_api.py
+++ b/metagpt/provider/ollama_api.py
@@ -51,9 +51,13 @@ class OllamaLLM(BaseLLM):
         return json.loads(chunk)
 
     async def _achat_completion(self, messages: list[dict], timeout: int = USE_CONFIG_TIMEOUT) -> dict:
-        headers = None if not self.config.api_key or self.config.api_key == "sk-" else {
-            "Authorization": f"Bearer {self.config.api_key}",
-        }
+        headers = (
+            None
+            if not self.config.api_key or self.config.api_key == "sk-"
+            else {
+                "Authorization": f"Bearer {self.config.api_key}",
+            }
+        )
         resp, _, _ = await self.client.arequest(
             method=self.http_method,
             url=self.suffix_url,
@@ -70,9 +74,13 @@ class OllamaLLM(BaseLLM):
         return await self._achat_completion(messages, timeout=self.get_timeout(timeout))
 
     async def _achat_completion_stream(self, messages: list[dict], timeout: int = USE_CONFIG_TIMEOUT) -> str:
-        headers = None if not self.config.api_key or self.config.api_key == "sk-" else {
-            "Authorization": f"Bearer {self.config.api_key}",
-        }
+        headers = (
+            None
+            if not self.config.api_key or self.config.api_key == "sk-"
+            else {
+                "Authorization": f"Bearer {self.config.api_key}",
+            }
+        )
         stream_resp, _, _ = await self.client.arequest(
             method=self.http_method,
             url=self.suffix_url,