  
  class Whiz(models.Model):
      CHOICES = (
          ('Group 1', (
                  (1, 'First'),
                  (2, 'Second'),
          )
          ),
          ('Group 2', (
                  (3, 'Third'),
                  (4, 'Fourth'),
 
</s> remove                 (3, 'Third'),
                (4, 'Fourth'),
 </s> add             (3, 'Third'),
            (4, 'Fourth'), </s> remove                     'django.template.loaders.filesystem.Loader',
 </s> add                 'django.template.loaders.filesystem.Loader', </s> remove         return "PK = %d, base_name = %s, derived_name = %s" \
                % (self.customPK, self.base_name, self.derived_name)
 </s> add         return "PK = %d, base_name = %s, derived_name = %s" % (
            self.customPK, self.base_name, self.derived_name) </s> remove         bool(f.rel) if hasattr(f, 'rel') else
        isinstance(f, models.related.RelatedObject)), RelatedFieldListFilter)
 </s> add     bool(f.rel) if hasattr(f, 'rel') else
    isinstance(f, models.related.RelatedObject)), RelatedFieldListFilter) </s> remove                         b'Content-Type: application/x-compress',
                        b'Content-Type: application/x-zip',
                        b'Content-Type: application/x-zip-compressed',
                        b'Content-Type: application/zip',))
 </s> add             b'Content-Type: application/x-compress',
            b'Content-Type: application/x-zip',
            b'Content-Type: application/x-zip-compressed',
            b'Content-Type: application/zip',))
            (1, 'First'),
            (2, 'Second'),
  
  class Whiz(models.Model):
      CHOICES = (
          ('Group 1', (
            (1, 'First'),
            (2, 'Second'),
            (1, 'First'),
            (2, 'Second'),
          )
          ),
          ('Group 2', (
                  (3, 'Third'),
                  (4, 'Fourth'),
keep keep keep keep replace replace keep keep keep keep keep
 Fixed #21288 -- Fixed E126 pep8 warnings 
tests/model_fields/models.py