Ubuntu 13.04 Install and running Python 3 at the same time than Python 2.7.x

Ubuntu 13.04 Install and running Python 3 at the same time than Python 2.7.x

Im using 13.04 but I want have installed the both main Python versions for
make tests about migration of my actual code.
is possible install Python 3 in the same machine running Python 2.7? I
need work with both versions,thanks!