def __init__(self, code, title="", explanation=""):
        self.code = code
        # There is a strict rule about constructing status line for HTTP:
        # '...Status-Line, consisting of the protocol version followed by a
        # numeric status code and its associated textual phrase, with each
        # element separated by SP characters'
        # (http://www.faqs.org/rfcs/rfc2616.html)
        # 'code' and 'title' can not be empty because they correspond
        # to numeric status code and its associated text
        if title:
            self.title = title
        else:
            try:
                self.title = woutil.status_reasons[self.code]
            except __HOLE__:
                msg = _LE("Improper or unknown HTTP status code used: %d")
                LOG.error(msg, code)
                self.title = woutil.status_generic_reasons[self.code // 100]
        self.explanation = explanation
        super(ConvertedException, self).__init__()
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/exception.py/ConvertedException.__init__