server：

import socket,os


server = socket.socket()
server.bind(("localhost",9999))
server.listen()


while  True:
    conn, addr = server.accept()
    while True:
        data= conn.recv(1024)
        print("接受成功",data)
        if not data:
            print("客戶端已經斷開")
            break
        print("執行指令",data)

        cmd_res =os.popen(data.decode()).read()
 
        print("before send ",len(cmd_res))
        if len(cmd_res)==0:
            cmd_res = "cmd has no putput"
        conn.send(str(len(cmd_res.encode())).encode("utf-8"))
        client_rec = conn.recv(1024)#去掉粘包
        conn.send(cmd_res.encode("utf-8"))
        print("send done ...")
server.close()


client：
 

import socket

client = socket.socket()
client.connect(("localhost",9999))

while True:
    cmd = input(">>:").strip()
    if len(cmd)==0:continue
    client.send(cmd.encode("utf-8"))
    print("傳送成功")
    cmd_res_size = client.recv(1024) #接收這條命令執行結果的大小
    print("命令結果的大小",cmd_res_size)
    client.send("準備好接收了,發吧loser".encode("utf-8"))
 
    received_size = 0#已接收到的資料
    received_data =b''

    while received_size < int(cmd_res_size.decode()):
        data = client.recv(1024)
        received_size +=len(data)
        received_data +=data

    else:
        print("cmd res receive done...",received_size)
        print(received_data.decode())
client.close()