      def __str__(self):
          return "%s ** 2 == %s" % (self.root, self.square)
  
  
  @python_2_unicode_compatible
  class Person(models.Model):
      first_name = models.CharField(max_length=20)
      last_name = models.CharField(max_length=20)
  
      def __str__(self):
 
</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 
      def __str__(self):
          return "%s ** 2 == %s" % (self.root, self.square)
  
  

  class Person(models.Model):
      first_name = models.CharField(max_length=20)
      last_name = models.CharField(max_length=20)
  
      def __str__(self):
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed python_2_unicode_compatible decorator usage 
tests/backends/models.py