  from django.test import TestCase
  from django.utils import six
  
  from .models import (
      A, B, Building, C, Chick, Child, Class, Client, ClientStatus, Connection,
      Country, Device, Enrollment, Hen, Item, Organizer, Person, Port,
      SpecialClient, State, Student, TUser,
 
</s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six
 </s> add  </s> remove from django.utils import six
 </s> add 
  from django.test import TestCase

  
  from .models import (
      A, B, Building, C, Chick, Child, Class, Client, ClientStatus, Connection,
      Country, Device, Enrollment, Hen, Item, Organizer, Person, Port,
      SpecialClient, State, Student, TUser,
keep replace keep keep keep keep keep
 Refs #23919 -- Removed six.<various>_types usage

Thanks Tim Graham and Simon Charette for the reviews. 
tests/select_related_regress/tests.py