The home page of my website is really a Wordpress blog, but I'd also enjoy some non-PHP server-side programming on some kind of special URL's and subdirectories from the root. Can you really have Flask or Sinatra or any other web framework exist together with Wordpress? I am using Apache on Webfaction right now.

Thanks, Kevin

Virtually anything in Wordpress experiences a mod_rewrite redirect to some single PHP script:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]

as lengthy as the others can exist together with this particular spinning (either by utilizing actual real scripts, or rewrites that do not trigger the Wordpress stuff), you ought to be fine.