diff --git a/NG-RO/osm_ng_ro/ns.py b/NG-RO/osm_ng_ro/ns.py
index f2e3405..d964912 100644
--- a/NG-RO/osm_ng_ro/ns.py
+++ b/NG-RO/osm_ng_ro/ns.py
@@ -1008,12 +1008,10 @@
                     == "persistent-storage:persistent-storage"
                 ):
                     for vdu_volume in vdu_instantiation_volumes_list:
-
                         if (
                             vdu_volume["vim-volume-id"]
                             and root_disk["id"] == vdu_volume["name"]
                         ):
-
                             persistent_root_disk[vsd["id"]] = {
                                 "vim_volume_id": vdu_volume["vim-volume-id"],
                                 "image_id": vdu.get("sw-image-desc"),
@@ -1025,7 +1023,6 @@
                             return disk_list, persistent_root_disk
 
                     else:
-
                         if root_disk.get("size-of-storage"):
                             persistent_root_disk[vsd["id"]] = {
                                 "image_id": vdu.get("sw-image-desc"),
@@ -1065,9 +1062,7 @@
                 and disk["id"] not in persistent_root_disk.keys()
             ):
                 for vdu_volume in vdu_instantiation_volumes_list:
-
                     if vdu_volume["vim-volume-id"] and disk["id"] == vdu_volume["name"]:
-
                         persistent_disk[disk["id"]] = {
                             "vim_volume_id": vdu_volume["vim-volume-id"],
                         }
@@ -1282,9 +1277,11 @@
             )
 
         if vdu_instantiation_volumes_list:
-
             # Find the root volumes and add to the disk_list
-            (disk_list, persistent_root_disk,) = Ns.find_persistent_root_volumes(
+            (
+                disk_list,
+                persistent_root_disk,
+            ) = Ns.find_persistent_root_volumes(
                 vnfd, target_vdu, vdu_instantiation_volumes_list, disk_list
             )
 
@@ -1298,7 +1295,6 @@
             )
 
         else:
-
             # vdu_instantiation_volumes_list is empty
             for vdu in vnfd.get("vdu", ()):
                 if vdu["name"] == target_vdu["vdu-name"]:
@@ -1434,7 +1430,6 @@
             vim_details = yaml.safe_load(f"{vim_details_text}")
 
         for iface_index, interface in enumerate(existing_vdu["interfaces"]):
-
             if "port-security-enabled" in interface:
                 interface["port_security"] = interface.pop("port-security-enabled")
 
@@ -2773,7 +2768,6 @@
                             task_index += 1
                             break
                 else:
-
                     for vdu_index, vdu in enumerate(db_vnfr["vdur"]):
                         extra_dict["params"] = {
                             "vim_vm_id": vdu["vim-id"],
diff --git a/NG-RO/osm_ng_ro/ns_thread.py b/NG-RO/osm_ng_ro/ns_thread.py
index 80d4aa7..2a3c57c 100644
--- a/NG-RO/osm_ng_ro/ns_thread.py
+++ b/NG-RO/osm_ng_ro/ns_thread.py
@@ -1037,7 +1037,6 @@
         return self.new(ro_task, task_create_index, None)
 
     def new(self, ro_task, task_index, task_depends):
-
         task = ro_task["tasks"][task_index]
         task_id = task["task_id"]
         target_vim = self.my_vims[ro_task["target_id"]]
@@ -2419,7 +2418,10 @@
                             )
 
                         if task["action"] == "DELETE":
-                            (new_status, db_vim_info_update,) = self._delete_task(
+                            (
+                                new_status,
+                                db_vim_info_update,
+                            ) = self._delete_task(
                                 ro_task, task_index, task_depends, db_ro_task_update
                             )
                             new_status = (
@@ -2467,7 +2469,10 @@
                             else:
                                 refresh_at = ro_task["vim_info"]["refresh_at"]
                                 if refresh_at and refresh_at != -1 and now > refresh_at:
-                                    (new_status, db_vim_info_update,) = self.item2class[
+                                    (
+                                        new_status,
+                                        db_vim_info_update,
+                                    ) = self.item2class[
                                         task["item"]
                                     ].refresh(ro_task)
                                     _update_refresh(new_status)
diff --git a/NG-RO/osm_ng_ro/tests/test_ns.py b/NG-RO/osm_ng_ro/tests/test_ns.py
index af44850..02561b7 100644
--- a/NG-RO/osm_ng_ro/tests/test_ns.py
+++ b/NG-RO/osm_ng_ro/tests/test_ns.py
@@ -1494,7 +1494,6 @@
         self,
         epa_params,
     ):
-
         target_flavor = {}
         indata = {
             "vnf": [
@@ -1521,7 +1520,6 @@
         self,
         epa_params,
     ):
-
         target_flavor = {
             "no-target-flavor": "here",
         }
@@ -1544,7 +1542,6 @@
         self,
         epa_params,
     ):
-
         expected_result = {
             "find_params": {
                 "flavor_data": {
@@ -1589,7 +1586,6 @@
         self,
         epa_params,
     ):
-
         expected_result = {
             "find_params": {
                 "flavor_data": {
@@ -1747,7 +1743,6 @@
         self,
         epa_params,
     ):
-
         expected_result = {
             "find_params": {
                 "flavor_data": {
@@ -1924,7 +1919,6 @@
         self,
         epa_params,
     ):
-
         expected_result = {
             "find_params": {
                 "flavor_data": {
diff --git a/NG-RO/osm_ng_ro/vim_admin.py b/NG-RO/osm_ng_ro/vim_admin.py
index 3350d43..b6e34e1 100644
--- a/NG-RO/osm_ng_ro/vim_admin.py
+++ b/NG-RO/osm_ng_ro/vim_admin.py
@@ -39,7 +39,6 @@
 
 
 class LockRenew:
-
     renew_list = []
     # ^ static method, common for all RO. Time ordered list of dictionaries with information of locks that needs to
     # be renewed. The time order is achieved as it is appended at the end