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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def bootstrap(self, arg=None):
        '''
        This only takes args so it can be used as a callback. Don't
        pass an arg, it is ignored.
        '''
        try:
            d = self.protocol.add_event_listener(
                'CONF_CHANGED', self._conf_changed)
        except RuntimeError:
            # for Tor versions which don't understand CONF_CHANGED
            # there's nothing we can really do.
            log.msg(
                "Can't listen for CONF_CHANGED event; won't stay up-to-date "
                "with other clients.")
            d = defer.succeed(None)
        d.addCallback(lambda _: self.protocol.get_info_raw("config/names"))
        d.addCallback(self._do_setup)
        d.addCallback(self.do_post_bootstrap)
        d.addErrback(self.do_post_errback)