With some more research on comp.lang.python I found that this topic has been discussed earlier to some extend.
One recommendation was to use numpy. This would introduce an additional dependency which I try to avoid. The earlier posts generally highlight some specific feature of calling with arrays. Can someone point me to a piece of software, where sth. like this is actually used? Stefan S. (Ondekoza) -- http://mail.python.org/mailman/listinfo/python-list
