          if self.name == '_invalid':
              raise ValidationError('invalid')
  
  
  @python_2_unicode_compatible
  class EmptyModel(models.Model):
      def __str__(self):
          return "Primary key = %s" % self.id
  
  
 
</s> remove @python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add 
          if self.name == '_invalid':
              raise ValidationError('invalid')
  
  

  class EmptyModel(models.Model):
      def __str__(self):
          return "Primary key = %s" % self.id
  
  
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed python_2_unicode_compatible decorator usage 
tests/admin_views/models.py