怎么查看电脑空的端口号

sudo apt-get install nmap

sudo nmap -sS -O localhost

import socket

def find_free_port(start_port, end_port):
    for port in range(start_port, end_port + 1):
        with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
            result = s.connect_ex(('localhost', port))
            if result != 0:  # Port is free
                return port
    return None

free_port = find_free_port(8000, 9000)
if free_port:
    print(f"Free port found: {free_port}")
else:
    print("No free ports in the specified range.")