BOM-2369 (A): pyupgrade on api,contentstore and cms_user_tasks apps under CMS (#26676)

* pyupgrade on cms api,contentstore and cms_user_tasks apps

cms/djangoapps/cms_user_tasks/tests.py

@@ -4,9 +4,9 @@ Unit tests for integration of the django-user-tasks app and its REST API.
 
 
 import logging
+from unittest import mock
 from uuid import uuid4
 
-import mock
 from boto.exception import NoAuthHandlerFound
 from django.conf import settings
 from django.contrib.auth.models import User  # lint-amnesty, pylint: disable=imported-auth-user
@@ -80,7 +80,7 @@ class TestUserTasks(APITestCase):
         cls.artifact = UserTaskArtifact.objects.create(status=cls.status, text='Lorem ipsum')
 
     def setUp(self):
-        super(TestUserTasks, self).setUp()  # lint-amnesty, pylint: disable=super-with-arguments
+        super().setUp()
         self.status.refresh_from_db()
         self.client.force_authenticate(self.user)  # pylint: disable=no-member
 
@@ -152,7 +152,7 @@ class TestUserTaskStopped(APITestCase):
             total_steps=5)
 
     def setUp(self):
-        super(TestUserTaskStopped, self).setUp()  # lint-amnesty, pylint: disable=super-with-arguments
+        super().setUp()
         self.status.refresh_from_db()
         self.client.force_authenticate(self.user)  # pylint: disable=no-member
 
@@ -169,7 +169,7 @@ class TestUserTaskStopped(APITestCase):
             platform_name=settings.PLATFORM_NAME, studio_name=settings.STUDIO_NAME
         )
         body_fragments = [
-            "Your {task_name} task has completed with the status".format(task_name=self.status.name.lower()),
+            f"Your {self.status.name.lower()} task has completed with the status",
             "https://test.edx.org/",
             reverse('usertaskstatus-detail', args=[self.status.uuid])
         ]
@@ -202,7 +202,7 @@ class TestUserTaskStopped(APITestCase):
             platform_name=settings.PLATFORM_NAME, studio_name=settings.STUDIO_NAME
         )
         fragments = [
-            "Your {task_name} task has completed with the status".format(task_name=self.status.name.lower()),
+            f"Your {self.status.name.lower()} task has completed with the status",
             "Sign in to view the details of your task or download any files created."
         ]
 
@@ -234,4 +234,4 @@ class TestUserTaskStopped(APITestCase):
             mock_delay.side_effect = NoAuthHandlerFound()
             user_task_stopped.send(sender=UserTaskStatus, status=self.status)
             self.assertTrue(mock_delay.called)
-            self.assertEqual(hdlr.messages['error'][0], u'Unable to queue send_task_complete_email')
+            self.assertEqual(hdlr.messages['error'][0], 'Unable to queue send_task_complete_email')