  from django.core.exceptions import ValidationError
  from django.db import router
  from django.db.models.sql import InsertQuery
  from django.test import TestCase, skipUnlessDBFeature
  from django.utils import six
  from django.utils.timezone import get_fixed_timezone
  
  from .models import (
      Article, BrokenUnicodeMethod, Department, Event, Model1, Model2, Model3,
      NonAutoPK, Party, Worker,
 
</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.core.exceptions import ValidationError
  from django.db import router
  from django.db.models.sql import InsertQuery
  from django.test import TestCase, skipUnlessDBFeature

  from django.utils.timezone import get_fixed_timezone
  
  from .models import (
      Article, BrokenUnicodeMethod, Department, Event, Model1, Model2, Model3,
      NonAutoPK, Party, Worker,
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed six.<various>_types usage

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