diff --git a/dash/development/_py_components_generation.py b/dash/development/_py_components_generation.py
index bcb8ee86b7..0c62f24e45 100644
--- a/dash/development/_py_components_generation.py
+++ b/dash/development/_py_components_generation.py
@@ -50,10 +50,12 @@ def __init__(self, {default_argtext}):
         self._prop_names = {list_of_valid_keys}
         self._type = '{typename}'
         self._namespace = '{namespace}'
-        self._valid_wildcard_attributes = {list_of_valid_wildcard_attr_prefixes}
+        self._valid_wildcard_attributes = \
+            {list_of_valid_wildcard_attr_prefixes}
         self.available_events = {events}
         self.available_properties = {list_of_valid_keys}
-        self.available_wildcard_properties = {list_of_valid_wildcard_attr_prefixes}
+        self.available_wildcard_properties = \
+            {list_of_valid_wildcard_attr_prefixes}
 
         _explicit_args = kwargs.pop('_explicit_args')
         _locals = locals()