def _str2bool(self, s, default=False):
        s = str(s)
        if s.lower() in ['0', 'f', 'false', 'off', 'no', 'n']:
            return False
        elif s.lower() in ['1', 't', 'true', 'on', 'yes', 'y']:
            return True
        return default
Test Delete().
dataset/ETHPy150Open darcyliu/storyboard/markdown/extensions/headerid.py/HeaderIdTreeprocessor._str2bool--crossover with--dataset/ETHPy150Open google/simian/src/tests/simian/auth/gaeserver_test.py/Auth1ServerDatastoreSessionTest.testDelete