          data = {
              'host_set-TOTAL_FORMS': '2',
              'host_set-INITIAL_FORMS': '1',
              'host_set-MAX_NUM_FORMS': '0',
              'host_set-0-id': six.text_type(host1.id),
              'host_set-0-hostname': 'tranquility.hub.dal.net',
              'host_set-1-hostname': 'matrix.de.eu.dal.net'
          }
  
          # To save a formset as new, it needs a new hub instance
 
</s> remove             'usersite_set-0-id': six.text_type(usersite[0]['id']),
 </s> add             'usersite_set-0-id': str(usersite[0]['id']), </s> remove             'manager_set-0-id': six.text_type(manager[0]['id']),
 </s> add             'manager_set-0-id': str(manager[0]['id']), </s> remove             'form-0-id': six.text_type(poet.id),
 </s> add             'form-0-id': str(poet.id), </s> remove             'membership_set-0-date_joined': six.text_type(now.strftime('%Y-%m-%d %H:%M:%S')),
            'initial-membership_set-0-date_joined': six.text_type(now.strftime('%Y-%m-%d %H:%M:%S')),
 </s> add             'membership_set-0-date_joined': now.strftime('%Y-%m-%d %H:%M:%S'),
            'initial-membership_set-0-date_joined': now.strftime('%Y-%m-%d %H:%M:%S'), </s> remove             'ownerprofile-0-owner': six.text_type(owner1.auto_id),
 </s> add             'ownerprofile-0-owner': str(owner1.auto_id),
            'host_set-0-id': str(host1.id),
          data = {
              'host_set-TOTAL_FORMS': '2',
              'host_set-INITIAL_FORMS': '1',
              'host_set-MAX_NUM_FORMS': '0',
            'host_set-0-id': str(host1.id),
              'host_set-0-hostname': 'tranquility.hub.dal.net',
              'host_set-1-hostname': 'matrix.de.eu.dal.net'
          }
  
          # To save a formset as new, it needs a new hub instance
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_regress/tests.py