在Python3.7的环境下，每次都是执行到serial.read()就卡住了。

import serial

if name == '__main__':
serial = serial.Serial('COM3',115200)
if serial.isOpen():
print('串口打开成功！\n')
f = open('./test.txt','a')
print(1)
#pass
else :
print('串口打开失败！\n')

    try:
            getBytes=b''
            while True:
                    count = serial.inWaiting()
                    if count > 0:
                            data = serial.read(count)
                            print('数据读取成功')
                            if data != getBytes:
                                    print(data)
                                    f.write(data.decode('utf-8'))
                                    f.write('\n')
                                    getBytes=data

    except KeyboardInterrupt:
            if serial != None:
                    f.close()
                    serial.close()