diff --git a/fastapi/responses.py b/fastapi/responses.py
index 8941701d37..07f87ebaaf 100644
--- a/fastapi/responses.py
+++ b/fastapi/responses.py
@@ -1,6 +1,6 @@
+import inspect
+from collections.abc import AsyncIterator, Iterator
 from typing import Any
-from collections.abc import AsyncIterator
-from collections.abc import Iterator
 
 from fastapi.exceptions import FastAPIDeprecationWarning
 from starlette.responses import FileResponse as FileResponse  # noqa
@@ -11,7 +11,6 @@ from starlette.responses import RedirectResponse as RedirectResponse  # noqa
 from starlette.responses import Response as Response  # noqa
 from starlette.responses import StreamingResponse as StreamingResponse  # noqa
 from typing_extensions import deprecated
-import inspect
 
 
 def _is_async(obj: Any) -> bool:
@@ -182,6 +181,7 @@ def format_sse(
     # SSE events are separated by double newlines
     return "\n".join(lines) + "\n\n"
 
+
 try:
     import ujson
 except ImportError:  # pragma: nocover
diff --git a/tests/test_sse_response.py b/tests/test_sse_response.py
index a98b35d776..fd63edce21 100644
--- a/tests/test_sse_response.py
+++ b/tests/test_sse_response.py
@@ -1,5 +1,5 @@
 """Tests for Server-Sent Events (SSE) response classes."""
-import pytest
+
 from fastapi import FastAPI
 from fastapi.responses import SSEResponse, format_sse
 from fastapi.testclient import TestClient
@@ -195,7 +195,7 @@ def test_sse_response_custom_headers():
 
 def test_sse_export():
     """Test that SSEResponse is exported from fastapi."""
-    from fastapi import SSEResponse
-    from fastapi import format_sse
+    from fastapi import SSEResponse, format_sse
+
     assert SSEResponse is not None
     assert format_sse is not None