This document says that that by default, newspaper caches all previously extracted articles and eliminates any article which it has already extracted.
>>> cbs_paper = newspaper.build('http://cbs.com')
>>> cbs_paper.size()
1030
>>> cbs_paper = newspaper.build('http://cbs.com')
>>> cbs_paper.size()
2
Okay, but it says nothing if I build once a website how I can retrieve the cashed articles?