diff --git a/src/flask/cli.py b/src/flask/cli.py
index 574264dc..82fe8194 100644
--- a/src/flask/cli.py
+++ b/src/flask/cli.py
@@ -648,7 +648,7 @@ def _path_is_ancestor(path, other):
     """Take ``other`` and remove the length of ``path`` from it. Then join it
     to ``path``. If it is the original value, ``path`` is an ancestor of
     ``other``."""
-    return os.path.join(path, other[len(path):].lstrip(os.sep)) == other
+    return os.path.join(path, other[len(path) :].lstrip(os.sep)) == other
 
 
 def load_dotenv(path: str | os.PathLike | None = None) -> bool:
diff --git a/src/flask/config.py b/src/flask/config.py
index 802c88ef..7b6a137a 100644
--- a/src/flask/config.py
+++ b/src/flask/config.py
@@ -325,7 +325,7 @@ class Config(dict):
             if not k.startswith(namespace):
                 continue
             if trim_namespace:
-                key = k[len(namespace):]
+                key = k[len(namespace) :]
             else:
                 key = k
             if lowercase: