Merge pull request #21384 from edx/bom/python-3-swarm

cms/djangoapps/contentstore/tests/test_course_settings.py

cms/djangoapps/contentstore/views/assets.py

cms/djangoapps/contentstore/views/certificates.py

cms/djangoapps/contentstore/views/item.py

cms/lib/xblock/runtime.py

common/djangoapps/student/tests/factories.py

common/djangoapps/track/views/__init__.py

common/djangoapps/util/json_request.py

common/djangoapps/util/memcache.py

common/lib/xmodule/xmodule/course_metadata_utils.py

common/lib/xmodule/xmodule/modulestore/django.py

common/lib/xmodule/xmodule/modulestore/mongo/base.py

common/lib/xmodule/xmodule/modulestore/xml.py

lms/djangoapps/bulk_email/tests/test_course_optout.py

lms/djangoapps/ccx/views.py

lms/djangoapps/courseware/tests/test_date_summary.py

lms/djangoapps/courseware/views/views.py

lms/djangoapps/discussion/django_comment_client/utils.py

lms/djangoapps/edxnotes/views.py

lms/djangoapps/grades/models.py