Merge pull request #21137 from edx/INCR-343

INCR-343 Python 3 compatibility

cms/djangoapps/api/v1/serializers/course_runs.py

 """ Course run serializers. """
+from __future__ import absolute_import
+
 import logging
 import time  # pylint: disable=unused-import
+
 import six
 from django.contrib.auth import get_user_model
 from django.db import transaction
@@ -82,7 +85,7 @@ class CourseRunTeamSerializerMixin(serializers.Serializer):
 
 def image_is_jpeg_or_png(value):
     content_type = value.content_type
-    if content_type not in IMAGE_TYPES.keys():
+    if content_type not in list(IMAGE_TYPES.keys()):
         raise serializers.ValidationError(
             u'Only JPEG and PNG image types are supported. {} is not valid'.format(content_type))
 

cms/djangoapps/api/v1/tests/test_serializers/test_course_runs.py

+"""Tests for course run serializers"""
+
+from __future__ import absolute_import
+
 import datetime
 
 import ddt
 import pytz
 from django.test import RequestFactory
-from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
-from xmodule.modulestore.tests.factories import CourseFactory
 
 from openedx.core.lib.courses import course_image_url
 from student.roles import CourseInstructorRole, CourseStaffRole
 from student.tests.factories import UserFactory
-from ..utils import serialize_datetime
+from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
+from xmodule.modulestore.tests.factories import CourseFactory
+
 from ...serializers.course_runs import CourseRunSerializer
+from ..utils import serialize_datetime
 
 
 @ddt.ddt

cms/djangoapps/api/v1/tests/test_views/test_course_runs.py

+"""Tests for Course run views"""
+
+from __future__ import absolute_import
+
 import datetime
 
 import ddt
 import pytz
 from django.core.files.uploadedfile import SimpleUploadedFile
-from django.urls import reverse
 from django.test import RequestFactory
+from django.urls import reverse
 from opaque_keys.edx.keys import CourseKey
-from openedx.core.lib.courses import course_image_url
 from rest_framework.test import APIClient
+
+from openedx.core.lib.courses import course_image_url
+from student.models import CourseAccessRole
+from student.tests.factories import TEST_PASSWORD, AdminFactory, UserFactory
 from xmodule.contentstore.content import StaticContent
 from xmodule.contentstore.django import contentstore
 from xmodule.exceptions import NotFoundError
@@ -15,10 +22,8 @@ from xmodule.modulestore.django import modulestore
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory, ToyCourseFactory
 
-from student.models import CourseAccessRole
-from student.tests.factories import AdminFactory, TEST_PASSWORD, UserFactory
-from ..utils import serialize_datetime
 from ...serializers.course_runs import CourseRunSerializer
+from ..utils import serialize_datetime
 
 
 @ddt.ddt

cms/djangoapps/maintenance/tests.py

 """
 Tests for the maintenance app views.
 """
+from __future__ import absolute_import
+
 import json
 
 import ddt
+import six
 from django.conf import settings
 from django.urls import reverse
 
 from contentstore.management.commands.utils import get_course_versions
+from openedx.features.announcements.models import Announcement
 from student.tests.factories import AdminFactory, UserFactory
 from xmodule.modulestore import ModuleStoreEnum
 from xmodule.modulestore.django import modulestore
 from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase
 from xmodule.modulestore.tests.factories import CourseFactory, ItemFactory
 
-from openedx.features.announcements.models import Announcement
-
 from .views import COURSE_KEY_ERROR_MESSAGES, MAINTENANCE_VIEWS
 
 # This list contains URLs of all maintenance app views.
@@ -174,7 +176,7 @@ class TestForcePublish(MaintenanceViewTestCase):
         # validate non split error message
         course = CourseFactory.create(default_store=ModuleStoreEnum.Type.mongo)
         self.verify_error_message(
-            data={'course-id': unicode(course.id)},
+            data={'course-id': six.text_type(course.id)},
             error_message='Force publishing course is not supported with old mongo courses.'
         )
 
@@ -186,7 +188,7 @@ class TestForcePublish(MaintenanceViewTestCase):
         # validate non split error message
         course = CourseFactory.create(org='e', number='d', run='X', default_store=ModuleStoreEnum.Type.mongo)
         self.verify_error_message(
-            data={'course-id': unicode(course.id)},
+            data={'course-id': six.text_type(course.id)},
             error_message='Force publishing course is not supported with old mongo courses.'
         )
         # Now search for the course key in split version.
@@ -207,7 +209,7 @@ class TestForcePublish(MaintenanceViewTestCase):
 
         # now course is published, we should get `already published course` error.
         self.verify_error_message(
-            data={'course-id': unicode(course.id)},
+            data={'course-id': six.text_type(course.id)},
             error_message='Course is already in published state.'
         )
 
@@ -219,7 +221,7 @@ class TestForcePublish(MaintenanceViewTestCase):
             course (object): a course object.
         """
         # get draft and publish branch versions
-        versions = get_course_versions(unicode(course.id))
+        versions = get_course_versions(six.text_type(course.id))
 
         # verify that draft and publish point to different versions
         self.assertNotEqual(versions['draft-branch'], versions['published-branch'])
@@ -239,7 +241,7 @@ class TestForcePublish(MaintenanceViewTestCase):
 
         # force publish course view
         data = {
-            'course-id': unicode(course.id)
+            'course-id': six.text_type(course.id)
         }
         response = self.client.post(self.view_url, data=data, HTTP_X_REQUESTED_WITH='XMLHttpRequest')
         response_data = json.loads(response.content)

cms/djangoapps/maintenance/views.py

 """
 Views for the maintenance app.
 """
+from __future__ import absolute_import
+
 import logging
 
+import six
 from django.core.urlresolvers import reverse, reverse_lazy
 from django.core.validators import ValidationError
 from django.db import transaction
 from django.utils.decorators import method_decorator
 from django.utils.translation import ugettext as _
 from django.views.generic import View
+from django.views.generic.edit import CreateView, DeleteView, UpdateView
 from django.views.generic.list import ListView
-from django.views.generic.edit import CreateView, UpdateView, DeleteView
 from opaque_keys import InvalidKeyError
 from opaque_keys.edx.keys import CourseKey
 from six import text_type
 
 from contentstore.management.commands.utils import get_course_versions
 from edxmako.shortcuts import render_to_response
+from openedx.features.announcements.forms import AnnouncementForm
+from openedx.features.announcements.models import Announcement
 from util.json_request import JsonResponse
 from util.views import require_global_staff
 from xmodule.modulestore import ModuleStoreEnum
 from xmodule.modulestore.django import modulestore
 from xmodule.modulestore.exceptions import ItemNotFoundError
 
-from openedx.features.announcements.models import Announcement
-from openedx.features.announcements.forms import AnnouncementForm
-
 log = logging.getLogger(__name__)
 
 # This dict maintains all the views that will be used Maintenance app.
@@ -155,8 +157,8 @@ class ForcePublishCourseView(MaintenanceBaseView):
         Returns a dict containing unicoded values of draft and published draft versions.
         """
         return {
-            'draft-branch': unicode(versions['draft-branch']),
-            'published-branch': unicode(versions['published-branch'])
+            'draft-branch': six.text_type(versions['draft-branch']),
+            'published-branch': six.text_type(versions['published-branch'])
         }
 
     @transaction.atomic