三类场景各选什么

按三条规则给应用分类：要实时且能容忍丢 → UDP；短问短答且自己重试 → UDP；一对多 → UDP；否则 TCP：

apps = [("语音通话", "实时"), ("下载文件", "完整"), ("查域名", "短问答"), ("找打印机", "一对多"), ("网页", "完整"), ("游戏位置同步", "实时")]
udp_kinds = {"实时", "短问答", "一对多"}
print(",".join(name + ":" + ("U" if kind in udp_kinds else "T") for name, kind in apps))