怎么只显示域名

from urllib.parse import urlparse

def extract_domain(url):
    parsed_url = urlparse(url)
    domain = parsed_url.netloc
    return domain

# 示例URL
url = "https://www.example.com/path/to/resource?query=param"
domain = extract_domain(url)
print(domain)  # 输出: www.example.com

def extract_domain_without_port(url):
    parsed_url = urlparse(url)
    domain = parsed_url.netloc.split(':')[0]  # 去除端口号
    return domain

url_with_port = "https://www.example.com:8080/path/to/resource"
domain_without_port = extract_domain_without_port(url_with_port)
print(domain_without_port)  # 输出: www.example.com

import idna

def extract_idn_domain(url):
    parsed_url = urlparse(url)
    domain = parsed_url.net.netloc
    try:
        domain = idna.encode(domain).decode('ascii')
    except UnicodeError:
        pass
    return domain

url_idn = "https://例子.测试"
idn_domain = extract_idn_domain(url_idn)
print(idn_domain)  # 输出: xn--fsq.xn--0zwm56d