code: def save(self):
          
  
          # handle polymorphic models
          if self._is_polymorphic:
              if self._is_polymorphic_base:
                  raise PolymorphicModelException('cannot save polymorphic base model')
              else:
                  setattr(self, self._discriminator_column_name, self.__discriminator_value__)
  
          self.validate()
          self.__dmlquery__(self.__class__, self,
                            batch=self._batch,
                            ttl=self._ttl,
                            timestamp=self._timestamp,
                            consistency=self.__consistency__,
                            if_not_exists=self._if_not_exists,
                            conditional=self._conditional,
                            timeout=self._timeout,
                            if_exists=self._if_exists).save()
  
          self._set_persisted()
  
          self._timestamp = None
  
          return self
docs: Saves an object to the database.
  
          .. code-block:: python
  
              #create a person instance
              person = Person(first_name='Kimberly', last_name='Eggleston')
              #saves it to Cassandra
              person.save()