diff --git a/src/ospgrillage/osp_grillage.py b/src/ospgrillage/osp_grillage.py
index ce5b63e..3932f6b 100644
--- a/src/ospgrillage/osp_grillage.py
+++ b/src/ospgrillage/osp_grillage.py
@@ -739,9 +739,9 @@ def _create_standard_element_list(self):
             self.common_grillage_element_z_group.update({key: val})
         # populate start edge and end edge entries
         self.common_grillage_element_z_group[self.common_grillage_element_keys[4]] = [0]
-        self.common_grillage_element_z_group[self.common_grillage_element_keys[5]] = (
-            list(range(1, self.Mesh_obj.global_edge_count))
-        )
+        self.common_grillage_element_z_group[
+            self.common_grillage_element_keys[5]
+        ] = list(range(1, self.Mesh_obj.global_edge_count))
         self.common_grillage_element_z_group[self.common_grillage_element_keys[6]] = [
             0
         ]  # proxy 0 for set_member() loop
@@ -1965,9 +1965,9 @@ def add_load_case(
                         "load_factor": load_factor,
                     }
                     list_of_incr_load_case_dict.append(increment_load_case_dict)
-                self.moving_load_case_dict[moving_load_obj.name] = (
-                    list_of_incr_load_case_dict
-                )
+                self.moving_load_case_dict[
+                    moving_load_obj.name
+                ] = list_of_incr_load_case_dict
 
             if self.diagnostics:
                 print("Moving load case: {} created".format(moving_load_obj.name))
@@ -2483,7 +2483,6 @@ def get_MCK():
 
         massDOFs = []
         for nd in ops.getNodeTags():
-
             for j in range(6):  # NDF is number of DOFs/node
                 if ops.nodeMass(nd, j + 1) > 0.0:
                     massDOFs.append(ops.nodeDOFs(nd)[j])
@@ -2550,7 +2549,6 @@ def __init__(
         step: int = 1,
         **kwargs,
     ):
-
         self.analysis_name = analysis_name
         self.ops_grillage_name = ops_grillage_name
         self.time_series_tag = None