Python3 实现串口两进程同时读写

import threading,timeimport serialimport string  class SerThread:  def __init__(self, Port=0):    #初始化串口、blog文件名称    self.my_serial = serial.Serial()    self.my_serial.port=Port    self.my_serial.baudrate = 9600    self.my_serial.timeout = 1        self.alive = False    self.waitEnd = None    fname=time.strftime("%Y%m%d")#blog名称为当前时间    self.rfname='r'+fname #接收blog名称    self.sfname='s'+fname #发送blog名称    self.thread_read= None    self.thread_send=None             def waiting(self):    # 等待event停止标志    if not self.waitEnd is None:      self.waitEnd.wait()   def start(self):    #开串口以及blog文件     self.rfile=open(self.rfname,'w')    self.sfile=open(self.sfname,'w')    self.my_serial.open()           if self.my_serial.isOpen():      self.waitEnd = threading.Event()      self.alive = True            self.thread_read = threading.Thread(target=self.Reader)      self.thread_read.setDaemon(True)            self.thread_send=threading.Thread(target=self.Sender)      self.thread_send.setDaemon(True)            self.thread_read.start()      self.thread_send.start()      return True    else:      return False     def Reader(self):    while self.alive:      try:        n=self.my_serial.inWaiting()        data=''        if n:          data= self.my_serial.read(n).decode('utf-8')                 print ('recv'+' '+time.strftime("%Y-%m-%d %X")+' '+data.strip())          print (time.strftime("%Y-%m-%d %X:")+data.strip(),file=self.rfile)          if len(data)==1 and ord(data[len(data)-1])==113: #收到字母q，程序退出            break      except Exception as ex:        print (ex)             self.waitEnd.set()    self.alive = False    def Sender(self):    while self.alive:      try:        snddata=input("input data:/n")        self.my_serial.write(snddata.encode('utf-8'))        print ('sent'+' '+ time.strftime("%Y-%m-%d %X"))              print (snddata,file=self.sfile)               except Exception as ex:        print (ex)        self.waitEnd.set()    self.alive = False                         def stop(self):    self.alive = False    #self.thread_read.join()    #self.thread_send.join()    if self.my_serial.isOpen():      self.my_serial.close()    self.rfile.close()    self.sfile.close()       if __name__ == '__main__':      ser = SerThread('com4')  try:    if ser.start():      ser.waiting()      ser.stop()    else:      pass;        except Exception as ex:    print (ex)   if ser.alive:    ser.stop()   print ('End OK .');  del ser;