code: def create_dbsnapshot(self, snapshot_id, dbinstance_id):
          
          params = {'DBSnapshotIdentifier' : snapshot_id,
                    'DBInstanceIdentifier' : dbinstance_id}
          return self.get_object('CreateDBSnapshot', params, DBSnapshot)
docs: Create a new DB snapshot.
  
          :type snapshot_id: string
          :param snapshot_id: The identifier for the DBSnapshot
  
          :type dbinstance_id: string
          :param dbinstance_id: The source identifier for the RDS instance from
                                which the snapshot is created.
  
          :rtype: :class:`boto.rds.dbsnapshot.DBSnapshot`
          :return: The newly created DBSnapshot