  import datetime
  import uuid
  
  from django.db import models
  from django.utils import six
  
  
  class Author(models.Model):
      name = models.CharField(max_length=100)
  
 
</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 
  import datetime
  import uuid
  
  from django.db import models

  
  
  class Author(models.Model):
      name = models.CharField(max_length=100)
  
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_formsets/models.py