diff --git a/server/vbv_lernwelt/notify/services.py b/server/vbv_lernwelt/notify/services.py
index 48649c72..bf792511 100644
--- a/server/vbv_lernwelt/notify/services.py
+++ b/server/vbv_lernwelt/notify/services.py
@@ -9,14 +9,12 @@ from notifications.signals import notify
 from vbv_lernwelt.assignment.models import AssignmentType
 from vbv_lernwelt.core.models import User
 from vbv_lernwelt.course.models import CourseSession
-from vbv_lernwelt.course_session.models import (
-    CourseSessionAssignment,
-)
+from vbv_lernwelt.course_session.models import CourseSessionAssignment
 from vbv_lernwelt.notify.email.email_services import (
     create_template_data_from_course_session_attendance_course,
     EmailTemplate,
-    send_email,
     format_swiss_datetime,
+    send_email,
 )
 from vbv_lernwelt.notify.models import (
     Notification,