（PYTHON简单服务器）输入任务列表与子进程发生冲突

我正在分析和编辑一些代码，但无法使其正常工作。问题在于，当cmd接收并发回命令tasklist的输出时，它只给出该输出。例如：当我发送命令：tasklist时，客户端从服务器的tasklist返回tasklist的结果

但是，如果您继续在程序中使用该命令，并再次使用该命令，那么这次它将发送任务列表代码，而不是dir的输出。当您使用dir和其他小功能时，当您反复使用命令而没有向客户机发送错误的输出时，它确实起作用。我怀疑这与大小和子流程有关（因为任务列表是一个大列表，而目录不是）

客户：

  (SOCKET CODE, i dindnt import that would make this code way longer than it used to be, the problem isnt there)
    message = 4
    socket_server.send(message.encode()) #at client's computer chooses command
    if message == '4':
        cmd_com = input("Type cmd command ")# 
        socket_server.send(cmd_com.encode())
        receiveid_message = socket_server.recv(4096).decode()
        print(receiveid_message)
        continue

服务器：

message = (conn.recv(1024)).decode()
    print(message)
if message =='1' #RECEIVES FIRST MESSAGE FROM CLIENT
def cmd():
        def shell():
            output = subprocess.run(instruction, stdout=subprocess.PIPE, shell=True, stderr=subprocess.PIPE,# BUG LIGT AAN SUBPROCESS
                                    stdin=subprocess.PIPE)
            return output
        import threading
        print("getting instructions")
        instruction = (conn.recv(1024)).decode() #RECEIVES SECOND MESSAGE FROM CLIENT
        shel = threading.Thread(
            target=shell)  # Use of threading and a global variable to avoid hanging if command is too long to produce an output (probably a better way to do this)
        shel._running = True
        shel.start()
        time.sleep(1)
        shel._running = False
        result = str(shell().stdout.decode('CP437'))  # CP437 Decoding used for characters like " é " etc.
        conn.send(result.encode()) # SEND RESULT TO SERVER