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这是代码 

    import serial;
    import struct;
    import pyautogui;
    pyautogui.FAILSAFE = False;
    i=0;
    sig=[0.1];
    ser=serial.Serial('COM8',9600,);
    ser.flush();
    Lclick=0;
    while (1):
        sig[0]=(struct.unpack("<f",ser.read(4))[0]);
        #print ('\n');
        if (sig[0]>2.2) and Lclick==0:
            pyautogui.mouseDown();
            Lclick=1;
        elif (sig[0]<1.9 and Lclick==1):
            Lclick=0;
            pyautogui.mouseUp();
    ser.close();

我正在从 COM8 蓝牙串口读取柔性传感器电压。当我执行此代码时，它会单击一次，然后显示以下错误。

Traceback (most recent call last):
  File "E:/sem4/embd/Project/Mclick.py", line 27, in <module>
    pyautogui.mouseUp();
  File "C:\Python34\lib\site-packages\pyautogui\__init__.py", line 315, in mouseUp
    platformModule._mouseUp(x, y, 'left')
  File "C:\Python34\lib\site-packages\pyautogui\_pyautogui_win.py", line 415, in _mouseUp
    _sendMouseEvent(MOUSEEVENTF_LEFTUP, x, y)
  File "C:\Python34\lib\site-packages\pyautogui\_pyautogui_win.py", line 480, in _sendMouseEvent
    raise ctypes.WinError()
OSError: [WinError 997] Overlapped I/O operation is in progress.

令人惊讶的是，当打印状态未注释时，代码工作正常。我可以控制鼠标点击。我不明白它是如何做到的，以及为什么在评论 print 语句时它会给出错误。有人能帮我吗？

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