      def __str__(self):
          return self.f_a
  
  
  @python_2_unicode_compatible
  class C01(models.Model):
      mm_a = models.ManyToManyField(A01, db_table='d01')
      f_a = models.CharField(max_length=10, db_index=True)
      f_b = models.IntegerField()
  
 
</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 self.f_a
  
  

  class C01(models.Model):
      mm_a = models.ManyToManyField(A01, db_table='d01')
      f_a = models.CharField(max_length=10, db_index=True)
      f_b = models.IntegerField()
  
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed python_2_unicode_compatible decorator usage 
tests/unmanaged_models/models.py