def chan_recv(chan):
    data = chan.recv(1024)            # 刚登陆时，先输出一遍收到的数据
    sys.stdout.write(data.decode())   # 输出
    sys.stdout.flush()

if __name__ == '__main__':
    ssh = paramiko.SSHClient()
    ssh.load_system_host_keys()
    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    ssh.connect('10.10.10.2', port=22, username='cisco', password='cisco', timeout=3)  # 3秒超时
    channel = ssh.invoke_shell()

    chan_recv(channel)       # 开始前先收一下数据
    while True:              # 监听输入
        d = input()
        if d == 'quit':      # 如果输入quit，就退出
            break
        channel.send(d + '\n')
        chan_recv(channel)

    channel.close()
    ssh.close()