Consider python tag. It's programming, so belongs to Stack Overflow. System administrators hack scripts in it (and manage applications written in it), so it belongs to Server Fault. Power users use it too (I use it as a pocket calculator all the time) so it also belongs to Super User.
I think that it would be cool to quickly see what other angles of particular topic are discussed on sister projects by providing links to the
questions/tagged/python path on the other sites.