我有一个连接到ttyUSB0的FTDI设备 . 拔出并重新插入设备后，始终连接到ttyUSB1 . 我必须检测更改并采取相应措施以保持我的发送和recv功能运行 . 我试图在send和recv函数中检测它 . 这是我做的：

`
def recv_serial_data(n):
    global serial_port
    try:
        if not serial_port.isOpen():
            serial_port = serial.Serial('/dev/ttyUSB1', 115200, 0.05)

        data = serial_port.read(n)
        tmp = []

        for c in data:
            tmp.append(ord(c))
        print data

        return tmp
    except Exception, e:
        raise Exception("recv_serial_data: " + str(e))

def send_serial_data(data):
    print data,type(data)
    global serial_port
    try:
        if not serial_port.isOpen():
            serial_port.close()
            serial_port = serial.Serial('/dev/ttyUSB1', 115200, 0.05)


        if not isinstance(data, basestring):
            data = array.array("B",data).tostring()
            serial_port.write(data)
        elif isinstance(data, basestring):
            serial_port.write(data)
    except Exception, e:
        raise Exception("send_serial_data: " + str(e))

    return



    def main():

    #[Doing stuff]

    global serial_port

    #options.serial_port is '/dev/ttyUSB0'        
    serial_port = serial.Serial(options.serial_port, options.baudrate, timeout=options.tty_timeout)

    #[Doing stuff]

    serial_port.close()

if __name__ == "__main__":
    main()
`

我现在得到的是像"recv_serial_data: device reports readiness to read but returned no data"这样的消息（设备断开连接或端口多次访问？）“或"send_serial_data: write failed: [Errno 5] Input/Output error"只要我不拔掉设备，一切都运行顺畅 .

python linux pyserial linuxmint