Python urlparse — extract domain name without subdomain

Question

Need a way to extract a domain name without the subdomain from a url using Python urlparse.

For example, I would like to extract \"google.com\" from a f

Answer 1

There are multiple Python modules which encapsulate the (once Mozilla) Public Suffix List in a library, several of which don't require the input to be a URL. Even though the question asks about URL normalization specifically, my requirement was to handle just domain names, and so I'm offering a tangential answer for that.

The relative merits of publicsuffix2 over publicsuffixlist or publicsuffix are unclear, but they all seem to offer the basic functionality.

publicsuffix2:

>>> import publicsuffix  # sic
>>> publicsuffix.PublicSuffixList().get_public_suffix('www.google.co.uk')
u'google.co.uk'

• Supposedly more packaging-friendly fork of publicsuffix.

publicsuffixlist:

>>> import publicsuffixlist
>>> publicsuffixlist.PublicSuffixList().privatesuffix('www.google.co.uk')
'google.co.uk'

• Advertises idna support, which I however have not tested.

publicsuffix:

>>> import publicsuffix
>>> publicsuffix.PublicSuffixList(publicsuffix.fetch()).get_public_suffix('www.google.co.uk')
'google.co.uk'

• The requirement to handle the updates and caching the downloaded file yourself is a bit of a complication.