diff --git a/src/elody/csv.py b/src/elody/csv.py
index f3d6e86..3c6f272 100644
--- a/src/elody/csv.py
+++ b/src/elody/csv.py
@@ -210,7 +210,7 @@ def __fill_objects_from_csv(self):
                             options = metadata_info.get("value_options")
                             if options and value not in options:
                                 raise InvalidValueException(
-                                    f"The value \"{value}\" is invalid, these are the valid values: {options}"
+                                    f'The value "{value}" is invalid, these are the valid values: {options}'
                                 )
                             indexed_dict[type][id]["metadata"].append(
                                 self._get_metadata_object(metadata_key, value)
diff --git a/src/elody/exceptions.py b/src/elody/exceptions.py
index 6e70e31..17bca63 100644
--- a/src/elody/exceptions.py
+++ b/src/elody/exceptions.py
@@ -31,9 +31,11 @@ class InvalidExtensionException(Exception):
 class InvalidObjectException(Exception):
     pass
 
+
 class InvalidValueException(Exception):
     pass
 
+
 class NoMediafilesException(Exception):
     pass
 
diff --git a/src/elody/util.py b/src/elody/util.py
index 9a8bf24..eb52a01 100644
--- a/src/elody/util.py
+++ b/src/elody/util.py
@@ -230,7 +230,8 @@ def signal_entity_deleted(mq_client, entity):
 def signal_mediafiles_added_for_entity(mq_client, entity, mediafiles):
     data = {"entity": entity, "mediafiles": mediafiles}
     send_cloudevent(mq_client, "dams", "dams.mediafiles_added_for_entity", data)
-    
+
+
 def signal_relations_deleted_for_entity(mq_client, entity, relations):
     data = {"entity": entity, "relations": relations}
     send_cloudevent(mq_client, "dams", "dams.relations_deleted_for_entity", data)