diff --git a/fastapi/_compat/shared.py b/fastapi/_compat/shared.py
index 19438d08e..4568b6307 100644
--- a/fastapi/_compat/shared.py
+++ b/fastapi/_compat/shared.py
@@ -140,7 +140,16 @@ def is_v1_field_info(field_info: Any) -> bool:
 
     # shim _v1_params classes
     if _v1_params is not None:
-        for name in ("Param", "Body", "Form", "File", "Query", "Path", "Header", "Cookie"):
+        for name in (
+            "Param",
+            "Body",
+            "Form",
+            "File",
+            "Query",
+            "Path",
+            "Header",
+            "Cookie",
+        ):
             cls = getattr(_v1_params, name, None)
             if cls and isinstance(field_info, cls):
                 return True
diff --git a/fastapi/_compat/v1.py b/fastapi/_compat/v1.py
index e96efef17..124bb786e 100644
--- a/fastapi/_compat/v1.py
+++ b/fastapi/_compat/v1.py
@@ -33,9 +33,11 @@ except Exception:
         # pydantic v1: usar o erro mais próximo semanticamente
         from pydantic.errors import ConfigError as _PSGE
     except Exception:
+
         class _PSGE(Exception):  # fallback defensivo (não deve acontecer)
             pass
 
+
 PydanticSchemaGenerationError = _PSGE
 
 _pv1 = None
diff --git a/fastapi/utils.py b/fastapi/utils.py
index 5871a464b..506399ea5 100644
--- a/fastapi/utils.py
+++ b/fastapi/utils.py
@@ -111,9 +111,11 @@ def create_model_field(
     # Detect v1 context
     from fastapi._compat.shared import is_v1_field_info
 
-    is_v1_model = annotation_is_pydantic_v1(type_) or lenient_issubclass(type_, _get_v1().BaseModel)
+    is_v1_model = annotation_is_pydantic_v1(type_) or lenient_issubclass(
+        type_, _get_v1().BaseModel
+    )
     is_v1_field = is_v1_field_info(field_info)
-    is_forced_v1 = (version == "1")
+    is_forced_v1 = version == "1"
 
     # Route to appropriate ModelField
     if is_v1_model or is_v1_field or is_forced_v1:
@@ -128,6 +130,7 @@ def create_model_field(
 
     if PYDANTIC_V2:
         from ._compat import v2
+
         try:
             return v2.ModelField(**v2_kwargs)  # type: ignore[return-value]
         except PydanticSchemaGenerationError: