              self.assertQuerysetEqual(
                  Person.objects.all(), [
                      "James Jones",
                  ],
                  six.text_type
              )
          finally:
              signals.pre_delete.disconnect(pre_delete_handler)
              signals.post_delete.disconnect(post_delete_handler)
  
 
</s> remove             six.text_type
 </s> add             str </s> remove     def test_reverse_returns_unicode(self):
        name, expected, args, kwargs = test_data[0]
        self.assertIsInstance(
            reverse(name, args=args, kwargs=kwargs),
            six.text_type
        )

 </s> add  </s> remove                     ([six.text_type(self.author2)], [six.text_type(self.author3)]),
                    ([six.text_type(self.author3)], [six.text_type(self.author1)]),
                    ([six.text_type(self.author1)], [six.text_type(self.author2)])
 </s> add                     ([str(self.author2)], [str(self.author3)]),
                    ([str(self.author3)], [str(self.author1)]),
                    ([str(self.author1)], [str(self.author2)]) </s> remove             if (isinstance(dim, six.string_types) and 'Z' in dim) or dim == 3:
 </s> add             if (isinstance(dim, str) and 'Z' in dim) or dim == 3: </s> remove                 [six.text_type(i_like) for i_like in author.favorite_authors.all()],
                [six.text_type(likes_me) for likes_me in author.favors_me.all()]
 </s> add                 [str(i_like) for i_like in author.favorite_authors.all()],
                [str(likes_me) for likes_me in author.favors_me.all()]
                str
              self.assertQuerysetEqual(
                  Person.objects.all(), [
                      "James Jones",
                  ],
                str
              )
          finally:
              signals.pre_delete.disconnect(pre_delete_handler)
              signals.post_delete.disconnect(post_delete_handler)
  
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/signals/tests.py