diff --git a/osm_pla/server/server.py b/osm_pla/server/server.py
index 2258ed9..d2476ec 100644
--- a/osm_pla/server/server.py
+++ b/osm_pla/server/server.py
@@ -30,8 +30,8 @@
 
 
 class Server:
-    pil_price_list_file = Path('/placement/pil_price_list.yaml')
-    vnf_price_list_file = Path('/placement/vnf_price_list.yaml')
+    pil_price_list_file = Path("/placement/pil_price_list.yaml")
+    vnf_price_list_file = Path("/placement/vnf_price_list.yaml")
 
     def __init__(self, config: Config, loop=None):
         self.log = logging.getLogger("pla.server")
@@ -41,25 +41,31 @@
         self.loop = loop or asyncio.get_event_loop()
 
         try:
-            if config.get('database', 'driver') == "mongo":
+            if config.get("database", "driver") == "mongo":
                 self.db = dbmongo.DbMongo()
-                self.db.db_connect(config.get('database'))
-            elif config.get('database', 'driver') == "memory":
+                self.db.db_connect(config.get("database"))
+            elif config.get("database", "driver") == "memory":
                 self.db = dbmemory.DbMemory()
-                self.db.db_connect(config.get('database'))
+                self.db.db_connect(config.get("database"))
             else:
-                raise Exception("Invalid configuration param '{}' at '[database]':'driver'".format(
-                    config.get('database', 'driver')))
+                raise Exception(
+                    "Invalid configuration param '{}' at '[database]':'driver'".format(
+                        config.get("database", "driver")
+                    )
+                )
 
-            if config.get('message', 'driver') == "local":
+            if config.get("message", "driver") == "local":
                 self.msgBus = msglocal.MsgLocal()
-            elif config.get('message', 'driver') == "kafka":
+            elif config.get("message", "driver") == "kafka":
                 self.msgBus = msgkafka.MsgKafka()
             else:
-                raise Exception("Invalid message bus driver {}".format(
-                    config.get('message', 'driver')))
+                raise Exception(
+                    "Invalid message bus driver {}".format(
+                        config.get("message", "driver")
+                    )
+                )
             self.msgBus.loop = loop
-            self.msgBus.connect(config.get('message'))
+            self.msgBus.connect(config.get("message"))
 
         except Exception as e:
             self.log.exception("kafka setup error. Exception: {}".format(e))
@@ -78,7 +84,7 @@
         :return: project name to project id mapping
         """
         projects = self.db.get_list("projects")
-        return {project['_id']: project['name'] for project in projects}
+        return {project["_id"]: project["name"] for project in projects}
 
     def _get_nsd(self, nsd_id):
         """
@@ -119,10 +125,10 @@
         :return: True if project part of price list, else False
         """
         price_list_entry_keys = set(price_list[0].keys())
-        price_list_entry_keys.remove('vnfd')
+        price_list_entry_keys.remove("vnfd")
         pl_key = price_list_entry_keys.pop()
         entry_to_check = price_list[0][pl_key][0].keys()
-        return True if 'prices' in entry_to_check else False
+        return True if "prices" in entry_to_check else False
 
     def _get_vnf_price_list(self, price_list_file_path, project_name=None):
         """
@@ -136,12 +142,21 @@
         if self._price_list_with_project(price_list_data):
             res = {}
             for i in price_list_data:
-                price_data = i[project_name] if type(i[project_name]) is dict else i[project_name][0]
-                res_component = {i['vim_name']: i['price'] for i in price_data['prices']}
-                res.update({i['vnfd']: res_component})
+                price_data = (
+                    i[project_name]
+                    if type(i[project_name]) is dict
+                    else i[project_name][0]
+                )
+                res_component = {
+                    i["vim_name"]: i["price"] for i in price_data["prices"]
+                }
+                res.update({i["vnfd"]: res_component})
             return res
         else:
-            return {i['vnfd']: {i1['vim_name']: i1['price'] for i1 in i['prices']} for i in price_list_data}
+            return {
+                i["vnfd"]: {i1["vim_name"]: i1["price"] for i1 in i["prices"]}
+                for i in price_list_data
+            }
 
     def _get_pil_info(self, pil_info_file_path):
         """
@@ -160,10 +175,11 @@
          return tuples with mappings {<adjusted id>: <original id>} and {<original id>: <adjusted id>}
         """
         # TODO: Change for multiple DF support
-        ns_df = nsd.get('df', [{}])[0]
+        ns_df = nsd.get("df", [{}])[0]
         next_idx = itertools.count()
-        member_vnf_index2mzn = {e['id']: 'VNF' + str(next(next_idx)) for e in
-                                ns_df.get('vnf-profile', [])}
+        member_vnf_index2mzn = {
+            e["id"]: "VNF" + str(next(next_idx)) for e in ns_df.get("vnf-profile", [])
+        }
 
         # reverse the name map dictionary, used when the placement result is remapped
         mzn_name2member_vnf_index = {v: k for k, v in member_vnf_index2mzn.items()}
@@ -183,41 +199,47 @@
         """
         try:
             nslcmop = self._get_nslcmop(nslcmop_id)
-            nsd = self._get_nsd(nslcmop['operationParams']['nsdId'])
+            nsd = self._get_nsd(nslcmop["operationParams"]["nsdId"])
             member_vnf_index2mzn, mzn2member_vnf_index = self._create_vnf_id_maps(nsd)
             # adjust vnf identifiers
             # TODO: Change for multiple DF support
-            ns_df = nsd.get('df', [{}])[0]
-            for vnf_profile in ns_df.get('vnf-profile', []):
-                vnf_profile['id'] = member_vnf_index2mzn[vnf_profile['id']]
-                for vlc in vnf_profile.get('virtual-link-connectivity', []):
-                    for ccpd in vlc.get('constituent-cpd-id', []):
-                        ccpd['constituent-base-element-id'] = member_vnf_index2mzn[ccpd['constituent-base-element-id']]
+            ns_df = nsd.get("df", [{}])[0]
+            for vnf_profile in ns_df.get("vnf-profile", []):
+                vnf_profile["id"] = member_vnf_index2mzn[vnf_profile["id"]]
+                for vlc in vnf_profile.get("virtual-link-connectivity", []):
+                    for ccpd in vlc.get("constituent-cpd-id", []):
+                        ccpd["constituent-base-element-id"] = member_vnf_index2mzn[
+                            ccpd["constituent-base-element-id"]
+                        ]
             self.log.info("adjusted nsd: {}".format(nsd))
             projects = self._get_projects()
             self.log.info("projects: {}".format(projects))
-            nslcmop_project = nslcmop['_admin']['projects_read'][0]
+            nslcmop_project = nslcmop["_admin"]["projects_read"][0]
             self.log.info("nslcmop_project: {}".format(nslcmop_project))
-            valid_vim_accounts = nslcmop['operationParams']['validVimAccounts']
+            valid_vim_accounts = nslcmop["operationParams"]["validVimAccounts"]
             vim_accounts_data = self._get_vim_accounts(valid_vim_accounts)
-            vims_information = {_['name']: _['_id'] for _ in vim_accounts_data}
-            price_list = self._get_vnf_price_list(Server.vnf_price_list_file, projects[nslcmop_project])
+            vims_information = {_["name"]: _["_id"] for _ in vim_accounts_data}
+            price_list = self._get_vnf_price_list(
+                Server.vnf_price_list_file, projects[nslcmop_project]
+            )
             pil_info = self._get_pil_info(Server.pil_price_list_file)
-            pinnings = nslcmop['operationParams'].get('vnf', [])
+            pinnings = nslcmop["operationParams"].get("vnf", [])
             # remap member-vnf-index values according to id map
             for pinning in pinnings:
-                pinning['member-vnf-index'] = member_vnf_index2mzn[pinning['member-vnf-index']]
+                pinning["member-vnf-index"] = member_vnf_index2mzn[
+                    pinning["member-vnf-index"]
+                ]
             self.log.info("pinnings: {}".format(pinnings))
-            order_constraints = nslcmop['operationParams'].get('placement-constraints')
+            order_constraints = nslcmop["operationParams"].get("placement-constraints")
             self.log.info("order constraints: {}".format(order_constraints))
 
-            nspd = NsPlacementDataFactory(vims_information,
-                                          price_list,
-                                          nsd,
-                                          pil_info,
-                                          pinnings, order_constraints).create_ns_placement_data()
+            nspd = NsPlacementDataFactory(
+                vims_information, price_list, nsd, pil_info, pinnings, order_constraints
+            ).create_ns_placement_data()
 
-            vnf_placement = MznPlacementConductor(self.log).do_placement_computation(nspd)
+            vnf_placement = MznPlacementConductor(self.log).do_placement_computation(
+                nspd
+            )
 
         except Exception as e:
             # Note: there is no cure for failure so we have a catch-all clause here
@@ -226,14 +248,17 @@
         finally:
             # remap names in vnf_placement
             for e in vnf_placement:
-                e['member-vnf-index'] = mzn2member_vnf_index[e['member-vnf-index']]
-            await self.msgBus.aiowrite("pla", "placement",
-                                       {'placement': {'vnf': vnf_placement, 'nslcmopId': nslcmop_id}})
+                e["member-vnf-index"] = mzn2member_vnf_index[e["member-vnf-index"]]
+            await self.msgBus.aiowrite(
+                "pla",
+                "placement",
+                {"placement": {"vnf": vnf_placement, "nslcmopId": nslcmop_id}},
+            )
 
     def handle_kafka_command(self, topic, command, params):
         self.log.info("Kafka msg arrived: {} {} {}".format(topic, command, params))
         if topic == "pla" and command == "get_placement":
-            nslcmop_id = params.get('nslcmopId')
+            nslcmop_id = params.get("nslcmopId")
             self.loop.create_task(self.get_placement(nslcmop_id))
 
     async def kafka_read(self):