DNSsec如何管理域名

import dns.resolver
import dns.dnssec

def verify_dnssec(domain):
    resolver = dns.resolver.Resolver()
    resolver.timeout = 2
    resolver.lifetime = 2

    try:
        response = resolver.resolve(domain, 'A', raise_on_no_answer=False)
        if response.rrset is not None:
            dns.dnssec.validate(response.response, response.request.qname, response.request.answer[0], response.request.answer[1])
            print(f"{domain} is DNSSEC validated.")
        else:
            print(f"No answer for {domain}")
    except dns.resolver.NXDOMAIN:
        print(f"{domain} does not exist.")
    except dns.resolver.NoAnswer:
        print(f"{domain} has no A records.")
    except dns.resolver.Timeout:
        print(f"Timed out while querying {domain}.")
    except dns.dnssec.ValidationFailure:
        print(f"DNSSEC validation failed for {domain}.")

verify_dnssec('example.com')