the __future__ is now

bookshare/api/serializers.py

-# standard library imports
-from __future__ import absolute_import, print_function, unicode_literals
 # third party imports
 from rest_framework import serializers
 # imports from your apps

bookshare/api/urls.py

-# standard libary imports
-from __future__ import absolute_import, print_function, unicode_literals
 # core django imports
 from django.urls import include, path
 # third party imports

bookshare/api/views.py

-# standard library imports
-from __future__ import absolute_import, print_function
 # third party imports
 from rest_framework.pagination import PageNumberPagination
 from rest_framework.viewsets import ReadOnlyModelViewSet

bookshare/core/cas_callbacks.py

-# standard library imports
-from __future__ import absolute_import, print_function, unicode_literals
 # core django imports
 from django.conf import settings
 from django.contrib.auth.models import User

bookshare/settings/settings.py

@@ -3,7 +3,6 @@ Django settings for the bookshare project.
 """
 
 # standard library imports
-from __future__ import absolute_import, print_function, unicode_literals
 import os
 # core django imports
 from django.contrib.messages import constants as messages