How can I install a newer version of python

[nathan.charles.summer at gmail.com]

I am on MacOS 10.5. It has python 2.5.1 installed.

How can I install a newer version of python (e.g. 3.1) without
breaking my current environment (I am not sure what programs/scripts
are using the python comes with MacOS). I just want to use the newer
version of python for my own project.

I found this "http://wiki.python.org/moin/MacPython/Leopard", but i
have no idea what that is related to my situation.

Thank you for any tip.