      class Meta:
          proxy = True
  
  
  @python_2_unicode_compatible
  class Thing(models.Model):
      title = models.CharField(max_length=20)
      color = models.ForeignKey(Color, models.CASCADE, limit_choices_to={'warm': True})
      pub_date = models.DateField(blank=True, null=True)
  
 
</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 
      class Meta:
          proxy = True
  
  

  class Thing(models.Model):
      title = models.CharField(max_length=20)
      color = models.ForeignKey(Color, models.CASCADE, limit_choices_to={'warm': True})
      pub_date = models.DateField(blank=True, null=True)
  
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed python_2_unicode_compatible decorator usage 
tests/admin_views/models.py