Python-based "Portal System"?

[Alessandro Bottoni]

Most likely, all of you know a number of open source, pre-built "portal 
systems", like ezPublish (http://developer.ez.no), PHPNuke 
(www.phpnuke.org), PostNuke (http://www.postnuke.com), Midgard 
(http://www.midgard-project.org/) and so on.

Does anybody know if exists a Portal System like those, written in Python?

Thanks in advance

Alessandro Bottoni

PS: I know about Zope (http://www.zope.org) and WebWare 
(http://webware.sourceforge.net), already...