diff --git a/fastapi/_compat.py b/fastapi/_compat.py
index 3e0261ae8..6a05684cb 100644
--- a/fastapi/_compat.py
+++ b/fastapi/_compat.py
@@ -18,14 +18,13 @@ from typing import (
     Union,
 )
 
+from fastapi.exceptions import RequestErrorModel
+from fastapi.types import IncEx, ModelNameMap, UnionType
 from pydantic import BaseModel, create_model
 from pydantic.version import VERSION as P_VERSION
 from starlette.datastructures import UploadFile
 from typing_extensions import Annotated, Literal, get_args, get_origin
 
-from fastapi.exceptions import RequestErrorModel
-from fastapi.types import IncEx, ModelNameMap, UnionType
-
 # Reassign variable to make it reexported for mypy
 PYDANTIC_VERSION = P_VERSION
 PYDANTIC_V2 = PYDANTIC_VERSION.startswith("2.")
@@ -288,6 +287,7 @@ if PYDANTIC_V2:
         return BodyModel
 
 else:
+    from fastapi.openapi.constants import REF_PREFIX as REF_PREFIX
     from pydantic import AnyUrl as Url  # noqa: F401
     from pydantic import (  # type: ignore[assignment]; noqa: F401
         BaseConfig as BaseConfig,
@@ -322,15 +322,15 @@ else:
     from pydantic.fields import (  # type: ignore[no-redef, attr-defined]; noqa: F401
         UndefinedType as UndefinedType,
     )
-    from pydantic.schema import field_schema
-    from pydantic.schema import (  # type: ignore[no-redef]  # noqa: F401
-        get_annotation_from_field_info as get_annotation_from_field_info,
-    )
     from pydantic.schema import (
+        field_schema,
         get_flat_models_from_fields,
         get_model_name_map,
         model_process_schema,
     )
+    from pydantic.schema import (  # type: ignore[no-redef]  # noqa: F401
+        get_annotation_from_field_info as get_annotation_from_field_info,
+    )
     from pydantic.typing import (  # type: ignore[no-redef]; noqa: F401
         evaluate_forwardref as evaluate_forwardref,
     )
@@ -338,8 +338,6 @@ else:
         lenient_issubclass as lenient_issubclass,
     )
 
-    from fastapi.openapi.constants import REF_PREFIX as REF_PREFIX
-
     GetJsonSchemaHandler = Any  # type: ignore[assignment,misc]
     JsonSchemaValue = Dict[str, Any]  # type: ignore[misc]
     CoreSchema = Any  # type: ignore[assignment,misc]
diff --git a/fastapi/applications.py b/fastapi/applications.py
index 63c797f55..b880c6d4f 100644
--- a/fastapi/applications.py
+++ b/fastapi/applications.py
@@ -13,17 +13,6 @@ from typing import (
     Union,
 )
 
-from starlette.applications import Starlette
-from starlette.datastructures import State
-from starlette.exceptions import HTTPException
-from starlette.middleware import Middleware
-from starlette.middleware.base import BaseHTTPMiddleware
-from starlette.requests import Request
-from starlette.responses import HTMLResponse, JSONResponse, Response
-from starlette.routing import BaseRoute
-from starlette.types import ASGIApp, Lifespan, Receive, Scope, Send
-from typing_extensions import Annotated, Doc, deprecated
-
 from fastapi import routing
 from fastapi.datastructures import Default, DefaultPlaceholder
 from fastapi.exception_handlers import (
@@ -42,6 +31,16 @@ from fastapi.openapi.utils import get_openapi
 from fastapi.params import Depends
 from fastapi.types import DecoratedCallable, IncEx
 from fastapi.utils import generate_unique_id
+from starlette.applications import Starlette
+from starlette.datastructures import State
+from starlette.exceptions import HTTPException
+from starlette.middleware import Middleware
+from starlette.middleware.base import BaseHTTPMiddleware
+from starlette.requests import Request
+from starlette.responses import HTMLResponse, JSONResponse, Response
+from starlette.routing import BaseRoute
+from starlette.types import ASGIApp, Lifespan, Receive, Scope, Send
+from typing_extensions import Annotated, Doc, deprecated
 
 AppType = TypeVar("AppType", bound="FastAPI")
 
diff --git a/fastapi/routing.py b/fastapi/routing.py
index 116eaa88a..7f7f45611 100644
--- a/fastapi/routing.py
+++ b/fastapi/routing.py
@@ -19,24 +19,6 @@ from typing import (
     Union,
 )
 
-from pydantic import BaseModel
-from starlette import routing
-from starlette.concurrency import run_in_threadpool
-from starlette.exceptions import HTTPException
-from starlette.requests import Request
-from starlette.responses import JSONResponse, Response
-from starlette.routing import BaseRoute, Match
-from starlette.routing import Mount as Mount  # noqa
-from starlette.routing import (
-    compile_path,
-    get_name,
-    request_response,
-    websocket_session,
-)
-from starlette.types import ASGIApp, Lifespan, Scope
-from starlette.websockets import WebSocket
-from typing_extensions import Annotated, Doc, deprecated
-
 from fastapi import params
 from fastapi._compat import (
     ModelField,
@@ -70,6 +52,24 @@ from fastapi.utils import (
     get_value_or_default,
     is_body_allowed_for_status_code,
 )
+from pydantic import BaseModel
+from starlette import routing
+from starlette.concurrency import run_in_threadpool
+from starlette.exceptions import HTTPException
+from starlette.requests import Request
+from starlette.responses import JSONResponse, Response
+from starlette.routing import (
+    BaseRoute,
+    Match,
+    compile_path,
+    get_name,
+    request_response,
+    websocket_session,
+)
+from starlette.routing import Mount as Mount  # noqa
+from starlette.types import ASGIApp, Lifespan, Scope
+from starlette.websockets import WebSocket
+from typing_extensions import Annotated, Doc, deprecated
 
 
 def _prepare_response_content(
diff --git a/tests/test_serialize_response_model.py b/tests/test_serialize_response_model.py
index ab9d4c6df..8ac3a5f1f 100644
--- a/tests/test_serialize_response_model.py
+++ b/tests/test_serialize_response_model.py
@@ -1,11 +1,10 @@
 from typing import Dict, List, Optional
 
 import pytest
-from pydantic import BaseModel, Field
-from starlette.testclient import TestClient
-
 from fastapi import FastAPI
 from fastapi._compat import PYDANTIC_V2, PYDANTIC_VERSION
+from pydantic import BaseModel, Field
+from starlette.testclient import TestClient
 
 app = FastAPI()
 
@@ -184,7 +183,9 @@ if PYDANTIC_V2:
         return {
             "k1": MultiUseItem(aliased_name="foo"),
             "k2": MultiUseItem(aliased_name="bar", secret="sEcReT"),
-            "k3": MultiUseItem(aliased_name="baz", secret="sEcReT", owner_ids=[1, 2, 3]),
+            "k3": MultiUseItem(
+                aliased_name="baz", secret="sEcReT", owner_ids=[1, 2, 3]
+            ),
         }
 
     client_v2 = TestClient(app_v2)