diff --git a/openedx/core/djangoapps/user_authn/migrations/0001_data__add_login_service.py b/openedx/core/djangoapps/user_authn/migrations/0001_data__add_login_service.py
index 8c081a2cd1..130882f4a7 100644
--- a/openedx/core/djangoapps/user_authn/migrations/0001_data__add_login_service.py
+++ b/openedx/core/djangoapps/user_authn/migrations/0001_data__add_login_service.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from __future__ import unicode_literals
+from __future__ import absolute_import, unicode_literals
 
 from django.conf import settings
 from django.db import migrations
diff --git a/openedx/core/djangoapps/user_authn/tests/test_cookies.py b/openedx/core/djangoapps/user_authn/tests/test_cookies.py
index 359915a4b0..edc9bfb446 100644
--- a/openedx/core/djangoapps/user_authn/tests/test_cookies.py
+++ b/openedx/core/djangoapps/user_authn/tests/test_cookies.py
@@ -1,20 +1,20 @@
 # pylint: disable=missing-docstring
-from __future__ import unicode_literals
+from __future__ import absolute_import, unicode_literals
 
-from mock import MagicMock, patch
 import six
 from django.conf import settings
 from django.http import HttpResponse
-from django.urls import reverse
 from django.test import RequestFactory, TestCase
-
+from django.urls import reverse
 from edx_rest_framework_extensions.auth.jwt.decoder import jwt_decode_handler
 from edx_rest_framework_extensions.auth.jwt.middleware import JwtAuthCookieMiddleware
+from mock import MagicMock, patch
+
+from openedx.core.djangoapps.user_api.accounts.utils import retrieve_last_sitewide_block_completed
 from openedx.core.djangoapps.user_authn import cookies as cookies_api
 from openedx.core.djangoapps.user_authn.tests.utils import setup_login_oauth_client
-from openedx.core.djangoapps.user_api.accounts.utils import retrieve_last_sitewide_block_completed
 from student.models import CourseEnrollment
-from student.tests.factories import UserFactory, AnonymousUserFactory
+from student.tests.factories import AnonymousUserFactory, UserFactory
 
 
 class CookieTests(TestCase):
@@ -52,7 +52,7 @@ class CookieTests(TestCase):
     def _copy_cookies_to_request(self, response, request):
         request.COOKIES = {
             key: val.value
-            for key, val in response.cookies.iteritems()
+            for key, val in six.iteritems(response.cookies)
         }
 
     def _set_use_jwt_cookie_header(self, request):
diff --git a/openedx/core/djangoapps/user_authn/tests/test_exceptions.py b/openedx/core/djangoapps/user_authn/tests/test_exceptions.py
index ac16d733c7..cb7c1c7caf 100644
--- a/openedx/core/djangoapps/user_authn/tests/test_exceptions.py
+++ b/openedx/core/djangoapps/user_authn/tests/test_exceptions.py
@@ -1,5 +1,7 @@
 """ Test Authn related exception. """
 
+from __future__ import absolute_import
+
 from unittest import TestCase
 
 from openedx.core.djangoapps.user_authn.exceptions import AuthFailedError
diff --git a/openedx/core/djangoapps/user_authn/tests/test_utils.py b/openedx/core/djangoapps/user_authn/tests/test_utils.py
index 533bed3bd0..45b5632447 100644
--- a/openedx/core/djangoapps/user_authn/tests/test_utils.py
+++ b/openedx/core/djangoapps/user_authn/tests/test_utils.py
@@ -1,8 +1,10 @@
 """ Test User Authentication utilities """
 
-from collections import namedtuple
-import ddt
+from __future__ import absolute_import
 
+from collections import namedtuple
+
+import ddt
 from django.test import TestCase
 from django.test.client import RequestFactory
 from django.test.utils import override_settings
diff --git a/openedx/core/djangoapps/user_authn/tests/utils.py b/openedx/core/djangoapps/user_authn/tests/utils.py
index c6efc9cfe6..31aaed2ea5 100644
--- a/openedx/core/djangoapps/user_authn/tests/utils.py
+++ b/openedx/core/djangoapps/user_authn/tests/utils.py
@@ -1,12 +1,14 @@
 """ Common utilities for tests in the user_authn app. """
+from __future__ import absolute_import
+
 from datetime import datetime, timedelta
 from enum import Enum
 from itertools import product
 
 import ddt
 import pytz
-from mock import patch
 from django.conf import settings
+from mock import patch
 from oauth2_provider import models as dot_models
 from rest_framework import status