python判断端口是否占用

def net_is_used(port,ip='127.0.0.1'):

    s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)

    try:

        s.connect((ip,port))

        s.shutdown(2)

        print('%s:%d is used' % (ip,port))

        return True

    except:

        print('%s:%d is unused' % (ip,port))

        return False