+ ‘blog/doctrees/2014/07/01/about.doctree’
+ ‘blog/doctrees/2014/07/03/definition.doctree’
+ ‘blog/doctrees/2014/07/04/test.doctree’
+ ‘blog/doctrees/environment.pickle’
+ ‘blog/doctrees/master.doctree’
+ ‘blog/doctrees/pages/about.doctree’
+ ‘blog/doctrees/pages/links.doctree’
+ ‘blog/html/.buildinfo’
< ‘blog/doctrees/2014/07/01/’
> ‘blog/html/’
+ ‘blog/html/2014/07/01/about.html’
...