client端执行命令，server端返回命令结果

# server 端import socket, subprocesssk = socket.socket()address=('127.0.0.1', 8000)sk.bind(address)sk.listen(3)print('waiting....')while 1:    conn, addr = sk.accept()    print(addr)    while 1:        try:            data = conn.recv(1024)        except Exception:            break        if not data: break        print('.........', str(data, 'utf8'))        obj = subprocess.Popen(data.decode('utf8'), shell=True, stdout=subprocess.PIPE)        cmd_result = obj.stdout.read()        result_len = bytes(str(len(cmd_result)), 'utf8')        print('>>>>>>', result_len)        conn.sendall(result_len)        conn.recv(1024)              # 预防粘包现象        conn.sendall(cmd_result)sk.close()# client 端import socketsk = socket.socket()print(sk)address = ('127.0.0.1', 8000)sk.connect(address)while True:    inp = input('>>>')    if inp == 'exit':        break    sk.send(bytes(inp, 'utf8'))    result_len = int(str(sk.recv(1024), 'utf8'))    sk.sendall(bytes('ok', 'utf8'))    print(result_len)    data = bytes()    while len(data) != result_len:        recv = sk.recv(1024)        data += recv    print(str(data, 'gbk'))sk.close()