code: def _batch_write_item(self, items):
          
          kwargs = {
              'RequestItems': {
                  self.tablename: items,
              },
              'ReturnConsumedCapacity': self.return_capacity,
              'ReturnItemCollectionMetrics': self.return_item_collection_metrics,
          }
          return self.connection.call('batch_write_item', **kwargs)
docs: Make a BatchWriteItem call to Dynamo