diff --git a/traitlets/traitlets.py b/traitlets/traitlets.py
index 3710ed4e..9bf8e75a 100644
--- a/traitlets/traitlets.py
+++ b/traitlets/traitlets.py
@@ -1008,7 +1008,6 @@ def setup_class(cls, classdict):
                     cls._all_trait_default_generators[name] = trait.default
 
 
-
 def observe(*names, type="change"):
     """A decorator which can be used to observe Traits on a class.
 
@@ -1225,7 +1224,6 @@ def setup_instance(*args, **kwargs):
             descriptor.instance_init(self)
 
 
-
 class HasTraits(HasDescriptors, metaclass=MetaHasTraits):
     _trait_values: t.Dict[str, t.Any]
     _trait_notifiers: t.Dict[str, t.Any]