diff --git a/scheduler/management/commands/rqstats.py b/scheduler/management/commands/rqstats.py
index 0912dac..a9a86a2 100644
--- a/scheduler/management/commands/rqstats.py
+++ b/scheduler/management/commands/rqstats.py
@@ -10,6 +10,8 @@
 ANSI_RESET = "\033[0m"
 
 KEYS = ('jobs', 'started_jobs', 'deferred_jobs', 'finished_jobs', 'canceled_jobs', 'workers')
+
+
 class Command(BaseCommand):
     """
     Print statistics
diff --git a/scheduler/settings.py b/scheduler/settings.py
index f16aaa6..59e3cda 100644
--- a/scheduler/settings.py
+++ b/scheduler/settings.py
@@ -13,7 +13,7 @@ def conf_settings():
 
     QUEUES = getattr(settings, 'SCHEDULER_QUEUES', None)
     if QUEUES is None:
-        logger.warning(f'Configuration using RQ_QUEUES is deprecated. Use SCHEDULER_QUEUES instead')
+        logger.warning('Configuration using RQ_QUEUES is deprecated. Use SCHEDULER_QUEUES instead')
         QUEUES = getattr(settings, 'RQ_QUEUES', None)
     if QUEUES is None:
         raise ImproperlyConfigured("You have to define RQ_QUEUES in settings.py")