Use ejabberdctl with python (cgi-script)

Thanks for ejabberd, but here I have a view questions, because I want a very special kind of user add/change, so:
I am programming on a website for handball players and I want to give registered users the opportunity to chat with each other.
The way it should work:
user registration finished: -> ejabberdctl should be called over python script to create this user as well in mnesia
user changes password -> ejabberdctl should be called to change this users password
that's the way I would prefer it.

I am running a Linux (Ubuntu) machine, lighttpd sqlite and a couple of cgi-scripts.
I already figured out that there's a cookie which may be used to call ejabberdctl as a 'normal' (www-data:www-data) user. The problem I run in is, that I have no idea how to call ejabberdctl with a python-script to get calls like:
register user host passwd
change_password user host passwd
and so on.

This is a feature a lot of people would like to have, but I did not find any proper solution.

Any help highly appreciated...