如何打印端口号的值？

import socket

def get_port():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.bind(('localhost', 0))
    _, port = sock.getsockname()
    sock.close()
    return port

print("当前端口号：", get_port())

import java.net.ServerSocket;
import java.io.IOException;

public class GetPort {
    public static void main(String[] args) {
        try (ServerSocket socket = new ServerSocket(0)) {
            int port = socket.getLocalPort();
            System.out.println("当前端口号：" + port);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

const net = require('net');

function getPort() {
    const server = net.createServer();
    server.listen(0, 'localhost', () => {
        const port = server.address().port;
        server.close();
        console.log("当前端口号：" + port);
    });
}

getPort();