先安装dnspython模块，可以指定dns服务器，自动检查各环境的dns解析，进行相关运维检查
pip install dnspython
import dns
SERVER = "114.114.114.114" #指定dns查询服务器
PORT = 53 #DNS server port
dns_query = dns.message.make_query("www.baidu.com", "A")
response = dns.query.udp(dns_query, SERVER, port = PORT)
for i in response.answer:
print(i.to_text())
