code: def add_batch(self, table, keys, attributes_to_get=None):
          
          self.append(Batch(table, keys, attributes_to_get))
docs: Add a Batch to this BatchList.
          
          :type table: :class:`boto.dynamodb.table.Table`
          :param table: The Table object in which the items are contained.
  
          :type keys: list
          :param keys: A list of scalar or tuple values.  Each element in the
              list represents one Item to retrieve.  If the schema for the
              table has both a HashKey and a RangeKey, each element in the
              list should be a tuple consisting of (hash_key, range_key).  If
              the schema for the table contains only a HashKey, each element
              in the list should be a scalar value of the appropriate type
              for the table schema.
          
          :type attributes_to_get: list
          :param attributes_to_get: A list of attribute names.
              If supplied, only the specified attribute names will
              be returned.  Otherwise, all attributes will be returned.