INCR-314 Run python-modernize on lms/djangoapps/grades/config and lms/djangoapps/grades/settings (#20611)

* run python modernize

* run isort

* Fix quality

lms/djangoapps/grades/config/__init__.py

@@ -1,7 +1,13 @@
+"""
+Defines grading configuration.
+"""
+from __future__ import absolute_import
+
 from django.conf import settings
 
 from lms.djangoapps.grades.config.models import PersistentGradesEnabledFlag
-from lms.djangoapps.grades.config.waffle import waffle as waffle_func, ASSUME_ZERO_GRADE_IF_ABSENT
+from lms.djangoapps.grades.config.waffle import ASSUME_ZERO_GRADE_IF_ABSENT
+from lms.djangoapps.grades.config.waffle import waffle as waffle_func
 
 
 def assume_zero_if_absent(course_key):

lms/djangoapps/grades/config/forms.py

@@ -1,6 +1,8 @@
 """
 Defines a form for providing validation of subsection grade templates.
 """
+from __future__ import absolute_import
+
 import logging
 
 from django import forms

lms/djangoapps/grades/config/models.py

@@ -2,6 +2,8 @@
 Models for configuration of the feature flags
 controlling persistent grades.
 """
+from __future__ import absolute_import
+
 from config_models.models import ConfigurationModel
 from django.conf import settings
 from django.db.models import BooleanField, IntegerField, TextField

lms/djangoapps/grades/config/tests/test_models.py

@@ -2,6 +2,8 @@
 Tests for the models that control the
 persistent grading feature.
 """
+from __future__ import absolute_import
+
 import itertools
 
 import ddt

lms/djangoapps/grades/config/tests/utils.py

@@ -2,7 +2,10 @@
 Provides helper functions for tests that want
 to configure flags related to persistent grading.
 """
+from __future__ import absolute_import
+
 from contextlib import contextmanager
+
 from edx_django_utils.cache import RequestCache
 
 from lms.djangoapps.grades.config.models import CoursePersistentGradesFlag, PersistentGradesEnabledFlag

lms/djangoapps/grades/config/waffle.py

@@ -2,7 +2,9 @@
 This module contains various configuration settings via
 waffle switches for the Grades app.
 """
-from openedx.core.djangoapps.waffle_utils import WaffleSwitchNamespace, WaffleFlagNamespace, CourseWaffleFlag
+from __future__ import absolute_import
+
+from openedx.core.djangoapps.waffle_utils import CourseWaffleFlag, WaffleFlagNamespace, WaffleSwitchNamespace
 
 # Namespace
 WAFFLE_NAMESPACE = u'grades'