I want to improve efficiency with Python even in an experimental system (4) Use ser.close () when an error is thrown using try syntax

Synopsis up to the last time

Up to the last time, measurement can be automated. This time, when the measuring device is in a bad mood, it will throw an error, so we will deal with it.

Windows COM port double digit or more unacceptable issue

-Microsoft Support Page --As mentioned on the above site, on Windows ** COM ports may continue to grow as the number of connected devices increases, but problems may occur when the number exceeds 10. In my environment, when ADVANTEST's R6441 is connected using a USB hub etc., measurement may fail if the COM port is 10 or more.

Resolve using try syntax

If you write the name of the exception (printed when an error occurs) after ʻexcept, you can determine the behavior when it fails. This time, I will do ser.close ()`.

try:
    while 1:
        if pulse >= MAX:
            ##End the while statement when the position reaches MAX
            break
        ##Record current location information
        pulse_list.append(pulse/2)
        ##Measure the current(Take 5 times and average it as the value at that position)
        for i in range(5):
            ser = serial.Serial(COMampere,bitRate,timeout=0.1)
            ser.write(b"F5, R0,PR2\r\n")
            time.sleep(1)
            ser.write(b"MD?\r\n")
            time.sleep(1)
            tmp = ser.read_all()
            #Skip if no current is available
            if len(tmp)== 0:
                ser.close()
                continue
            ampere = float(tmp.split()[2])
            ampere_average_list.append(ampere)
            time.sleep(1)
            ser.close()
        ##Current and pulse(position)To list
        ampere_list.append(sum(ampere_average_list)/len(ampere_average_list))
        ampere_average_list = []

        ##Move the optical table
        pulse += 1000
        position = "A:2+P"+str(pulse)+"\r\n"
        ser = serial.Serial(COMpulse,bitRate,timeout=0.1)
        ser.write(bytes(position, 'UTF-8'))
        time.sleep(1)
        ser.write(b"G:\r\n")
        ser.close()

    ##Turn the list into a dataframe
    print(ampere_list)
    print(pulse_list)
    df = pd.DataFrame({'ampere(A)':ampere_list,'pulse':pulse_list})
    def pulseToMilliMeter(pulse):
        return pulse*0.006
    df["position(mm)"] = df["pulse"].map(pulseToMilliMeter)
    df.to_csv('./csv/result.csv',index=False)
    plt.figure()
    df.plot(x='position(mm)',y='ampere(A)',marker='o')
    plt.savefig('./img/sample.png')
    plt.close('all')
except IndexError:
    ser.close()