I just installed python v 3.1.1 today to try to learn a programming language, and found this site to try some tasks. The problem is that the code is ok when i run it in my Python Shell, but not on this site. Is my syntax different because of the new python version? I get additional () on each line :(

Did you look at the help page?
In short, Python 3.x is not supported by codegolf.com