如何使用Python创建条件双向文件传输客户端服务器

Question

我尝试制作一个简单的服务器

a）客户端连接后立即发送文件 b）以后在编辑文件时接收文件

和一个客户端，该客户端在连接时会自动接收文件并稍后发送经过编辑的文件

因此对于接收第一部分的客户端部分来说，它工作正常，但是如果满足条件，如何发回文件

TCP_IP = 'localhost'
TCP_PORT = 9001
BUFFER_SIZE = 1024

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))
with open('received_file', 'wb') as f:
    print( 'file opened')
    while True:
        #print('receiving data...')
        data = s.recv(BUFFER_SIZE)
        print('data=%s', (data))
        if not data:
            f.close()
            print( 'file close()')
            break
        # write data to a file
        f.write(data)
s.close()
print('Successfully get the file')

if time.sleep(3):
    s.connect((TCP_IP, TCP_PORT))    
    with open('answer.txt', 'rb') as f:
        print( 'file opened')
        while True:
            #print('receiving data...')
            data = s.send(BUFFER_SIZE)
            print('data=%s', (data))
            print('Successfully send the file')
    s.close()

print('connection closed')

服务器

TCP_IP = "0.0.0.0"
TCP_PORT = 9001
BUFFER_SIZE = 1024

class ClientThread(Thread):

    def __init__(self,ip,port,sock):
        Thread.__init__(self)
        self.ip = ip
        self.port = port
        self.sock = sock
        print( " New thread started for "+ip+":"+str(port))

    def run(self):
        filename='filetosend.csv'
        f = open(filename,'rb')
        while True:
            l = f.read(BUFFER_SIZE)
            while (l):
                self.sock.send(l)
                #print('Sent ',repr(l))
                l = f.read(BUFFER_SIZE)
            if not l:
                f.close()
                self.sock.close()
                break

tcpsock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
tcpsock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
tcpsock.bind((TCP_IP, TCP_PORT))
threads = []

while True:
    tcpsock.listen(5)
    print("Waiting for incoming connections...")
    (conn, (ip,port)) = tcpsock.accept()
    print( 'Got connection from ', (ip,port))
    newthread = ClientThread(ip,port,conn)
    newthread.start()
    threads.append(newthread)

for t in threads:
    t.join()

我应该在哪里和什么地方收听客户端发送的文件？

客户端的发送部分是否正确？