python获取可用端口号

def getPort():
    pscmd = "netstat -ntl |grep -v Active| grep -v Proto|awk '{print $4}'|awk -F: '{print $NF}'"
    procs = os.popen(pscmd).read()
    procarr = procs.split("\n")
    tt= random.randint(15000,20000)
    if tt not in procarr:
        return tt
    else:
        getPort()


笨方法