Python asyncore接收类对象进行转发问题，pythonasyncore,实现一个程序， 原意是结

Python asyncore接收类对象进行转发问题，pythonasyncore,实现一个程序， 原意是结

实现一个程序， 原意是结合argparse接收命令行参数， 然后通过asyncore进行转发， 从而实现
我在命令行下执行程序监听一个端口，当在浏览器里输入localhost:port的时候,自动转发到远程remoteaddr, 然后再接收转发的conn返回给client，代码是这样的。

import argparse import asyncoreimport socketLOCAL_SERVER_HOST = 'localhost'REMOTE_SERVER_HOST = 'www.domain.com'BUFSIZE = 4096class PortForward(asyncore.dispatcher):    def __init__(self,ip,port,remoteip,remoteport,backlog=5):        asyncore.dispatcher.__init__(self)        self.remoteip = remoteip        self.remoteport = remoteport        self.create_socket(socket.AF_INET,socket.SOCK_STREAM)        self.set_reuse_addr()        self.bind((ip,port))        self.listen(backlog)    def handle_accept(self):        conn,addr = self.accept()        print('Connected',addr)        Sender(Receiver(conn),self.remoteip,self.remoteport) #这里，是在Sender类里传入一个Receiver类对象方法，与下面的self.receiver = receiver #传入相对应，因为需要使用Sender发送，所以要把传入的receiver绑定成当前自己sender,或者说绑定到sender上。class Receiver(asyncore.dispatcher):    def __init__(self,conn):        asyncore.dispatcher.__init__(self,conn)        self.from_remote_buffer = ''        self.to_remote_buffer = ''        self.sender = None    def handle_connect(self):        pass    def handle_read(self):        read = self.recv(4096)        self.from_remote_buffer += read    def writable(self):        return (len(self.to_remote_buffer)>0)    def handle_write(self):        sent = self.send(self.to_remote_buffer)        self.to_remote_buffer = self.to_remote_buffer[sent:]    def handle_close(self):        self.close()        if self.sender:            self.sender.close()class Sender(asyncore.dispatcher):    def __init__(self,receiver,remoteaddr,remoteport):        asyncore.dispatcher.__init__(self)        self.receiver = receiver #传入一个receiver对象        receiver.sender = self #把receiver对象绑定成自己        self.create_socket(socket.AF_INET,socket.SOCK_STREAM)        self.connect((remoteaddr,remoteport))    def handle_connect(self):        pass    def handle_read(self):        read = self.recv(4096)        self.receiver.to_remote_buffer += read #    def writable(self):        return (len(self.receiver.from_remote_buffer)>0)    def handle_write(self):        sent = self.send(self.receiver.from_remote_buffer)        self.receiver.from_remote_buffer = self.receiver.from_remote_buffer[sent:]    def handle_close(self):        self.close()        self.receiver.close()

Sender负责把接收到的发给服务端， Receiver负责把发送返回的conn反馈给client，比较疑惑的就是
self.receiver.from_remote_buffer self.receiver.to_remote_buffer 这么写是什么意思， 为什么要这么写

新手， 也许问题问的并不适合，但真心求教

编橙之家文章，