pyDNS库提供了DNS模块，首先应该在应用程序中调用DNS.DiscoverNameServers()，它可以找到系统中的名称服务器，在windows下是注册表，Unix系统上时/etc/resolv.conf 。全部的DNS查询都被发送到这些服务器上。-pyDNS library provides DNS module, you should first call DNS.DiscoverNameServers () in the application, it can be found in the system of name servers in the windows registry, when the Unix system /etc/resolv.conf. All DNS queries are sent to these servers.