python如何读取bin文件并下发串口

# coding:utf-8import time, serialfrom struct import *import binasciifile = open('E://1.bin', 'rb')i = 0while 1:  c = file.read(1)  # 将字节转换成16进制；  ssss = str(binascii.b2a_hex(c))[2:-1]  print(str(binascii.b2a_hex(c))[2:-1])  if not c:    break  ser = serial.Serial('COM3', 57600, timeout=1)  ser.write(bytes().fromhex(ssss))# 将16进制转换为字节  if i % 16 == 0:    time.sleep(0.001)  #写每一行等待的时间  i += 1  ser.close()file.close()