Get registered domain in Python and Javascript

reg-dom-libs are a set of libraries for C, PHP and Perl to convert an arbitrary domain name to the registered domain name.

• For simple domains, like www.amazon.com or news.ycombinator.com, the task is trivial.
• For more complicated ones, like www.ebay.co.uk or www.japantimes.co.jp, handling the second level subdomain is a little painful.
• For exoteric ones, like nic.com.ai or www.nic.net.ge or 公司.cn, the problem becomes virtually impossible.
• After seeing stupid ones, like www.comune.caserta.it (believe it or not, the registered domain is comune.caserta.it!), I gave up finding an elegant algorithm for the problem.
• A full list of valid registered domain is necessary. Luckily, it is available (and nightly updated) here.

Inspired by reg-dom-libs, I've ported the algorithm to Python and Javascript. See the tests at the end of each file for an example of the usage. A demo is available here.