'This operation enables you to put or delete several items
across multiple tables in a single API call.
:type request_items: dict
:param request_items: A Python version of the RequestItems
data structure defined by DynamoDB.'

def batch_write_item(self, request_items, object_hook=None):

    data = {'RequestItems': request_items}
    json_input = json.dumps(data)
    return self.make_request('BatchWriteItem', json_input, object_hook=object_hook)
