'info_once(message, *args, **kwargs)
Logs an info message.  The same message is never printed again.'

def info_once(self, message, *args, **kwargs):

    m = (message % args)
    if (m not in self._one_time_infos):
        if self.isEnabledFor(logging.INFO):
            self._one_time_infos.add(m)
        self._log(logging.INFO, message, args, kwargs, 'info_once')
