Fixing python-modernize issues.

cms/djangoapps/contentstore/api/views/utils.py

@@ -1,11 +1,13 @@
 """
 Common utilities for Contentstore APIs.
 """
+from __future__ import absolute_import
+
 from contextlib import contextmanager
 
+from opaque_keys.edx.keys import CourseKey
 from rest_framework import status
 from rest_framework.generics import GenericAPIView
-from opaque_keys.edx.keys import CourseKey
 
 from openedx.core.djangoapps.util.forms import to_bool
 from openedx.core.lib.api.view_utils import DeveloperErrorViewMixin, view_auth_classes