Ask HN: Best CMS/Platform/Tool for this Project

I’m trying to build a (non-mobile) website that resembles a crowd-sourced blog. Requirements are thus: (1) users can create accounts, (2) users submit posts (text w/ optional images) (3) users can vote on posts (4) front page shows highest rated posts. (5) users have a (public) page showing all of their submissions.

I'm capable of building something like this, but my gut feeling is that there is a CMS or platform that takes care of most of this out of the box. My first thought was Wordpress, but I’m not sure it is robust enough to handle all of these features.

I’m a python developer so if I built it I would probably use something like Django, but maybe there is something better? In my research people have recommended Joomla and especially Drupal for tasks like this, but I don’t know php and they both seem to have a steep learning curve.