Fix lint errors

tracetools_test/test/test_node.py

@@ -50,7 +50,7 @@ class TestNode(TraceTestCase):
             self.assertValidHandle(event, ['node_handle', 'rmw_handle'])
             self.assertStringFieldNotEmpty(event, 'node_name')
             self.assertStringFieldNotEmpty(event, 'namespace')
-        
+
         # Check that the launched nodes have a corresponding rcl_node_init event
         node_name_fields = [self.get_field(e, 'node_name') for e in rcl_node_init_events]
         for node_name in self._nodes:

tracetools_test/test/test_service_callback.py

@@ -54,8 +54,14 @@ class TestServiceCallback(TraceTestCase):
         for node in self._nodes:
             test_start_events = self.get_events_with_procname(node, start_events)
             test_end_events = self.get_events_with_procname(node, end_events)
-            self.assertGreater(len(test_start_events), 0, f'no start_callback events for node: {node}')
-            self.assertGreater(len(test_end_events), 0, f'no end_callback events for node: {node}')
+            self.assertGreater(
+                len(test_start_events),
+                0,
+                f'no start_callback events for node: {node}')
+            self.assertGreater(
+                len(test_end_events),
+                0,
+                f'no end_callback events for node: {node}')
 
 
 if __name__ == '__main__':

tracetools_test/test/test_subscription.py

@@ -44,7 +44,8 @@ class TestSubscription(TraceTestCase):
             self.assertValidQueueDepth(event, 'queue_depth')
             self.assertStringFieldNotEmpty(event, 'topic_name')
 
-        callback_added_events = self.get_events_with_name('ros2:rclcpp_subscription_callback_added')
+        callback_added_events = self.get_events_with_name(
+            'ros2:rclcpp_subscription_callback_added')
         for event in callback_added_events:
             self.assertValidHandle(event, ['subscription_handle', 'callback'])