python 中的"_,"问题请看以下代码:cmd_name = argv[1]cmd = xm_lookup_cmd(cmd_name)if cmd:# strip off prog name and subcmdargs = argv[2:]_, rc = _run_cmd(cmd, cmd_name, args)sys.exit(rc)else:err('Subcommand %s not found!' % cmd_name)usage()其中的一行: _, rc = _run_cmd(cmd, cmd_name, args)中的"_,",是什么意思?
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