如何使用telnetlib python查找本地主机上的开放端口？

import telnetlib

def check_port(host, port):
    try:
        tn = telnetlib.Telnet(host, port, timeout=2)
        tn.close()
        return True
    except Exception as e:
        return False

def find_open_ports(host):
    open_ports = []
    for port in range(1, 65536):
        if check_port(host, port):
            open_ports.append(port)
    return open_ports

# 示例使用
host = 'localhost'
open_ports = find_open_ports(host)
print("开放端口：", open_ports)