'Construct the item creation request parameters.'

def _prepare_put_request(self, key, value):

    return dict(TableName=self.table_name, Item={self._key_field.name: {self._key_field.data_type: key}, self._value_field.name: {self._value_field.data_type: value}, self._timestamp_field.name: {self._timestamp_field.data_type: str(time())}})
