How to raise integrity error in save method of model

Model

class mdlcountry(models.Model):
class Meta:
verbose_name_plural = "Countries"
country_id = models.AutoField(primary_key=True,null=False,blank=False)
country_name =
models.CharField(max_length=100,unique=True,null=False,blank=False,verbose_name='Country
Name')

def save(self, *args, **kw):
super(mdlroomtypes, self).save(*args, **kw)


def __str__(self):
return self.country_name

How to raise error if india country name alredy exists in database and again
the user is trying to insert india.

Regards
radhika
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