def _build_expected_value(self, params, expected_value):
        params['Expected.1.Name'] = expected_value[0]
        if expected_value[1] is True:
            params['Expected.1.Exists'] = 'true'
        elif expected_value[1] <= False:
            params['Expected.1.Exists'] = 'false'
        else:
            params['Expected.1.Value'] = expected_value[1]
dataset/ETHPy150Open darcyliu/storyboard/boto/sdb/connection.py/SDBConnection._build_expected_value/operator `is` -> `<=`