Any idea how to do this in Python?

[Lad]

In a web application users can post some information. I would like to
link each posting with a "weight of importance" for a user, depending
on a keywords in the posting.
For example, I know that a user A is interested in Nokia mobiles while
user B in Siemens mobiles.
So, if a user A is signed, he would see postings with more Nokia
information FIRST, while B user will see  FIRST  information about
Siemens mobiles
How can be that done in Python?
Thank you for any idea.
L.