python中返回多个变量

def get_info(tag):
    rss = 0 
    cpu = 0 
    vsz = 0
    res =  runcmd('ps axu |grep '+ tag + ' |grep -v grep')
    reslist =  res.split('\n')
    for line in reslist:
    if tag in line:
        #print line.split()[4],line.split()[5]
        rss += int(line.split()[5])
        vsz += int(line.split()[4])
        cpu += float(line.split()[2])
    print rss,vsz,cpu
    return rss,vsz,cpu

#函数的调用：
rss_qsumd,vsz_qsumd,cpu_qsumd = get_info('/var/ytt/bin/qsumd')