diff --git a/lms/djangoapps/grades/signals/handlers.py b/lms/djangoapps/grades/signals/handlers.py
index a1f8d482e0..9933f7c8be 100644
--- a/lms/djangoapps/grades/signals/handlers.py
+++ b/lms/djangoapps/grades/signals/handlers.py
@@ -2,36 +2,38 @@
 Grades related signals.
 """
 from __future__ import absolute_import
+
 from contextlib import contextmanager
 from logging import getLogger
 
 import six
-from courseware.model_data import get_score, set_score
 from django.dispatch import receiver
 from submissions.models import score_reset, score_set
 from xblock.scorable import ScorableXBlockMixin, Score
 
+from courseware.model_data import get_score, set_score
 from openedx.core.djangoapps.course_groups.signals.signals import COHORT_MEMBERSHIP_UPDATED
 from openedx.core.lib.grade_utils import is_score_higher_or_equal
 from student.models import user_by_anonymous_id
 from student.signals import ENROLLMENT_TRACK_UPDATED
 from track.event_transaction_utils import get_event_transaction_id, get_event_transaction_type
 from util.date_utils import to_timestamp
-from .signals import (
-    PROBLEM_RAW_SCORE_CHANGED,
-    PROBLEM_WEIGHTED_SCORE_CHANGED,
-    SCORE_PUBLISHED,
-    SUBSECTION_SCORE_CHANGED,
-    SUBSECTION_OVERRIDE_CHANGED,
-)
+
 from .. import events
 from ..constants import ScoreDatabaseTableEnum
 from ..course_grade_factory import CourseGradeFactory
 from ..scores import weighted_score
 from ..tasks import (
     RECALCULATE_GRADE_DELAY_SECONDS,
-    recalculate_subsection_grade_v3,
-    recalculate_course_and_subsection_grades_for_user
+    recalculate_course_and_subsection_grades_for_user,
+    recalculate_subsection_grade_v3
+)
+from .signals import (
+    PROBLEM_RAW_SCORE_CHANGED,
+    PROBLEM_WEIGHTED_SCORE_CHANGED,
+    SCORE_PUBLISHED,
+    SUBSECTION_OVERRIDE_CHANGED,
+    SUBSECTION_SCORE_CHANGED
 )
 
 log = getLogger(__name__)
diff --git a/lms/djangoapps/grades/signals/signals.py b/lms/djangoapps/grades/signals/signals.py
index 07acba5360..9b7836b5d5 100644
--- a/lms/djangoapps/grades/signals/signals.py
+++ b/lms/djangoapps/grades/signals/signals.py
@@ -2,6 +2,7 @@
 Grades related signals.
 """
 from __future__ import absolute_import
+
 from django.dispatch import Signal
 
 # Signal that indicates that a user's grade for a course has been updated.