we're still on py3.6

brian_polling_manager/interface_stats/common.py

@@ -303,7 +303,8 @@ class RouterProcessor:
     def iter_counters(self, interfaces: Dict[str, dict], point_group: PointGroup):
         for counters in self._interface_counters(interfaces, point_group):
             interface_name = counters["name"]
-            if not (group_counters := counters.get(point_group)):
+            group_counters = counters.get(point_group)
+            if not group_counters:
                 if point_group.required:
                     raise ValueError(
                         f"No {point_group} data available for '{interface_name}'"