      customPK = models.IntegerField(primary_key=True)
      derived_name = models.CharField(max_length=100)
  
      def __str__(self):
          return "PK = %d, base_name = %s, derived_name = %s" \
                  % (self.customPK, self.base_name, self.derived_name)
  
  class AuditBase(models.Model):
      planned_date = models.DateField()
  
      class Meta:
 
</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                 (1, 'First'),
                (2, 'Second'),
 </s> add             (1, 'First'),
            (2, 'Second'), </s> remove                 request.path_info, supported=self._supported_languages
 </s> add             request.path_info, supported=self._supported_languages </s> remove             return self.add_view(request, form_url=reverse('admin:%s_%s_add' %
                                    (opts.app_label, opts.model_name),
                                    current_app=self.admin_site.name))
 </s> add             return self.add_view(request, form_url=reverse('admin:%s_%s_add' % (
                opts.app_label, opts.model_name),
                current_app=self.admin_site.name)) </s> remove                             related_modeladmin.has_add_permission(request))
 </s> add                     related_modeladmin.has_add_permission(request))
        return "PK = %d, base_name = %s, derived_name = %s" % (
            self.customPK, self.base_name, self.derived_name)
      customPK = models.IntegerField(primary_key=True)
      derived_name = models.CharField(max_length=100)
  
      def __str__(self):
        return "PK = %d, base_name = %s, derived_name = %s" % (
            self.customPK, self.base_name, self.derived_name)
        return "PK = %d, base_name = %s, derived_name = %s" % (
            self.customPK, self.base_name, self.derived_name)
  
  class AuditBase(models.Model):
      planned_date = models.DateField()
  
      class Meta:
keep keep keep keep replace replace keep keep keep keep keep
 Fixed #21288 -- Fixed E126 pep8 warnings 
tests/model_inheritance_regress/models.py