Different Python versions on single PC

I want to install different versions of Python (and related packag开发者_运维技巧es and IDEs) on a single PC and keep them independent. I like the pythonxy but runs on Python 2.6, but I also wat to try Eric5 with Python3.1. How can I keep thess different install separated ?

On Windows, this is trivial. You just install both, they get put in different directories.

On Linux, this is less so, but still fairly simple. Install from source, and use make altinstall instead of make install.