python怎样读取bin文件并下发串口

# coding:utf-8
import time, serial
from struct import *
import binascii

file = open('E:\\1.bin', 'rb')
i = 0
while 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()