python调用串口，写入数据

#!/usr/bin/python3
 
import serial
 
def serialTest():
  try:
    port = "COM3"
    bps = 115200
    timeO = 5
    ser = serial.Serial(port, bps, timeout = timeO)
    result = ser.write("python invoke serial".encode("gbk"))
    print("write data: ", result)
    ser.close()
  except Exception as e:
    print("ERROR: ", e)
 
if __name__ == "__main__":
  serialTest()