  class User(models.Model):
      username = models.CharField(max_length=20)
  
  
  @python_2_unicode_compatible
  class Issue(models.Model):
      num = models.IntegerField()
      cc = models.ManyToManyField(User, blank=True, related_name='test_issue_cc')
      client = models.ForeignKey(User, models.CASCADE, related_name='test_issue_client')
  
 
</s> remove @python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add  </s> remove from django.utils.encoding import python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add  </s> remove @python_2_unicode_compatible
 </s> add 
  class User(models.Model):
      username = models.CharField(max_length=20)
  
  

  class Issue(models.Model):
      num = models.IntegerField()
      cc = models.ManyToManyField(User, blank=True, related_name='test_issue_cc')
      client = models.ForeignKey(User, models.CASCADE, related_name='test_issue_client')
  
keep keep keep keep replace keep keep keep keep keep
 Refs #23919 -- Removed python_2_unicode_compatible decorator usage 
tests/m2m_and_m2o/models.py