diff --git a/src/flask/app.py b/src/flask/app.py
index 794ae095..a68c8c55 100644
--- a/src/flask/app.py
+++ b/src/flask/app.py
@@ -1085,16 +1085,27 @@ class Flask(Scaffold):
 
         # Check HTTP method
         supported_http_methods = {
-            "GET", "POST", "PUT", "PATCH", "DELETE", 
-            "HEAD", "CONNECT", "OPTIONS", "TRACE",
-            "COPY", "LINK", "UNLINK", "PURGE",
-            "LOCK", "UNLOCK", "PROFIND", "VIEW"
+            "GET",
+            "POST",
+            "PUT",
+            "PATCH",
+            "DELETE",
+            "HEAD",
+            "CONNECT",
+            "OPTIONS",
+            "TRACE",
+            "COPY",
+            "LINK",
+            "UNLINK",
+            "PURGE",
+            "LOCK",
+            "UNLOCK",
+            "PROFIND",
+            "VIEW",
         }
         for item in methods:
             if item not in supported_http_methods:
-                raise TypeError(
-                    f"'{item}' method is not specified in HTTP."
-                )
+                raise TypeError(f"'{item}' method is not specified in HTTP.")
 
         rule = self.url_rule_class(rule, methods=methods, **options)
         rule.provide_automatic_options = provide_automatic_options  # type: ignore