I am writing a function by python to get a list of expired domains just like this one, but I can not find any library can do this, any ideas about this?
See https://github.com/richardpenman/whois (first Google search result when searching for python whois
). This allows you to determine the expiration date of a domain. But you will need to get a list of domains to check from somewhere (domaintools apparently gets them from domain auctions).