Extracting real-domain-name (without sub-domains) from a given URL

[Terry Reedy]

S.Selvam Siva wrote:

>> I doubt anyone's created a general ready-made solution for this, you'd
>> have to code it yourself.
>> To handle the common case, you can cheat and just .split() at the
>> periods and then slice and rejoin the list of domain parts, ex:
>> '.'.join(domain.split('.')[-2:])
>>
>> Cheers,
>> Chris
> 
> 
> Thank you Chris Rebert,
>   Actually i tried with domain specific logic.Having 200 TLD like
> .com,co.in,co.uk and tried to extract the domain name.
>   But my boss want more reliable solution than this method,any way i
> will try to find some alternative solution.

I make a dict mapping TLDs to number of parts to strip off
parts = {
'com':1,
'in':2,
'org':1,
'uk':2,
}
etc

If certain TLDs need a special function, define the function first and 
map that TLD to the function and then switch on the type of value (int 
or function) when you look it up.