diff --git a/fastapi/encoders.py b/fastapi/encoders.py
index 207f4900a..c9d1f2558 100644
--- a/fastapi/encoders.py
+++ b/fastapi/encoders.py
@@ -39,7 +39,7 @@ try:
 
     encoders_by_extra_type: dict[type[Any], Callable[[Any], Any]] = {
         coordinate.Coordinate: str,
-        et_color.Color: str
+        et_color.Color: str,
     }
 except ImportError:
     encoders_by_extra_type = {}
@@ -124,7 +124,9 @@ def generate_encoders_by_class_tuples(
 
 
 encoders_by_class_tuples = generate_encoders_by_class_tuples(ENCODERS_BY_TYPE)
-encoders_by_class_tuples.update(generate_encoders_by_class_tuples(encoders_by_extra_type))
+encoders_by_class_tuples.update(
+    generate_encoders_by_class_tuples(encoders_by_extra_type)
+)
 
 
 def jsonable_encoder(