diff --git a/src/caret_analyze/infra/lttng/event_counter.py b/src/caret_analyze/infra/lttng/event_counter.py
index 400895197..327877389 100644
--- a/src/caret_analyze/infra/lttng/event_counter.py
+++ b/src/caret_analyze/infra/lttng/event_counter.py
@@ -260,7 +260,8 @@ def ns_and_node_name(ns: str, name: str) -> str:
                     timer_handle_to_node_name.get(handler, '-')
 
         for handler, row in data.subscriptions.df.iterrows():
-            rmw_handle_to_node_name[row['rmw_handle']] = node_handle_to_node_name[row['node_handle']]
+            rmw_handle_to_node_name[row['rmw_handle']] = \
+                node_handle_to_node_name[row['node_handle']]
             rmw_handle_to_topic_name[row['rmw_handle']] = row['topic_name']
 
         tilde_pub_to_topic_name: dict[int, str] = {}
diff --git a/src/caret_analyze/infra/lttng/ros2_tracing/data_model_service.py b/src/caret_analyze/infra/lttng/ros2_tracing/data_model_service.py
index e238a8f22..9face0af2 100644
--- a/src/caret_analyze/infra/lttng/ros2_tracing/data_model_service.py
+++ b/src/caret_analyze/infra/lttng/ros2_tracing/data_model_service.py
@@ -194,7 +194,6 @@ def _get_rmw_handle_from_callback_object(
         except KeyError:
             return [None]
 
-
     @staticmethod
     def _ensure_dataframe(
         dataframe_or_series: pd.DataFrame | pd.Series
diff --git a/src/caret_analyze/runtime/path.py b/src/caret_analyze/runtime/path.py
index 02128f7d8..745f15281 100644
--- a/src/caret_analyze/runtime/path.py
+++ b/src/caret_analyze/runtime/path.py
@@ -231,7 +231,8 @@ def _merge_records(
         left_records.sort(first_column)
 
         # search drop columns, which contain 'source_timestamp'
-        source_columns = [column for column in left_records.columns if 'source_timestamp' in column]
+        source_columns = \
+            [column for column in left_records.columns if 'source_timestamp' in column]
         left_records.drop_columns(source_columns)
 
         return left_records