diff --git a/backend_py/primary/primary/services/flow_network_assembler/_group_tree_dataframe_model.py b/backend_py/primary/primary/services/flow_network_assembler/_group_tree_dataframe_model.py
index c0d3e797f..969579f84 100644
--- a/backend_py/primary/primary/services/flow_network_assembler/_group_tree_dataframe_model.py
+++ b/backend_py/primary/primary/services/flow_network_assembler/_group_tree_dataframe_model.py
@@ -171,7 +171,7 @@ def _create_branch_node_list(self, terminal_node: str) -> List[str]:
         current_parents = [terminal_node]
         while len(current_parents) > 0:
             # Find all indexes matching the current parents
-            children_indices = set([i for i, x in enumerate(parents_array) if x in current_parents])
+            children_indices = {i for i, x in enumerate(parents_array) if x in current_parents}
 
             # Find all children of the current parents
             children = nodes_array[list(children_indices)]
diff --git a/backend_py/primary/primary/services/flow_network_assembler/_utils.py b/backend_py/primary/primary/services/flow_network_assembler/_utils.py
index 27cee849f..627f67ed0 100644
--- a/backend_py/primary/primary/services/flow_network_assembler/_utils.py
+++ b/backend_py/primary/primary/services/flow_network_assembler/_utils.py
@@ -157,7 +157,7 @@ def create_sumvec_from_datatype_nodename_and_keyword(
     try:
         if keyword == "WELSPECS":
             datatype_ecl = WELL_DATATYPE_VECTOR_MAP[datatype]
-        elif keyword in TreeType._member_names_:
+        elif keyword in [t.value for t in TreeType]:
             datatype_ecl = GROUPTYPE_DATATYPE_VECTORS_MAP[TreeType[keyword]][datatype]
     except KeyError as exc:
         error = (
diff --git a/backend_py/primary/primary/services/flow_network_assembler/flow_network_assembler.py b/backend_py/primary/primary/services/flow_network_assembler/flow_network_assembler.py
index edbbd8487..14a5993a1 100644
--- a/backend_py/primary/primary/services/flow_network_assembler/flow_network_assembler.py
+++ b/backend_py/primary/primary/services/flow_network_assembler/flow_network_assembler.py
@@ -205,7 +205,6 @@ async def fetch_and_initialize_async(self) -> None:
         # Get all vectors of interest existing in the summary data
         vectors_of_interest = _utils.get_all_vectors_of_interest_for_tree(group_tree_df_model)
         vectors_of_interest = vectors_of_interest & self._all_vectors
-        # TODO: do we need to return to a list?
 
         # Has any water injection or gas injection vectors among vectors of interest
         has_wi_vectors = False
@@ -886,8 +885,8 @@ def _get_data_for_summary_vector_info(
     """Extracts and formats whatever data is available for a given summary vector. If the name is not present in the summary, a list of NaN values is given instead"""
     if sumvec_name in summary_col_set:
         return smry_for_grouptree_sorted_by_date[sumvec_name].to_numpy().round(2)
-    else:
-        return list([np.nan] * number_of_dates)
+
+    return list([np.nan] * number_of_dates)
 
 
 def _is_valid_node_type(node_classification: NodeClassification, valid_node_types: set[NodeType]) -> bool:
diff --git a/backend_py/primary/primary/services/flow_network_assembler/flow_network_types.py b/backend_py/primary/primary/services/flow_network_assembler/flow_network_types.py
index 06a478780..22c2d6d16 100644
--- a/backend_py/primary/primary/services/flow_network_assembler/flow_network_types.py
+++ b/backend_py/primary/primary/services/flow_network_assembler/flow_network_types.py
@@ -1,7 +1,5 @@
-from pydantic import BaseModel
-
-
 from typing import Dict, List, Literal
+from pydantic import BaseModel
 
 
 class NetworkNode(BaseModel):