def dist(a, b):
    return sum((i-j)**2 for i, j in zip(a, b))
def _format_exception_message(cls, msg, pid):
        return cls._EXCEPTION_LOG_FORMAT.format(
            timestamp=cls._iso_timestamp_for_now(),
            process_title=setproctitle.getproctitle(),
            args=sys.argv,
            pid=pid,
            message=msg,
        )