install python 2.6 on Ubuntu 12.04

[Gelonida N]

Hi,

On Ubuntu 12.04 python 2.7 is the default version

I'd like to install python 2.6 parallel to 2.7 and create a virtualenv 
for it.

The reason is, that I have to write some code, that will be executed 
under 2.6 and I want to be sure, that I don't accidentally write code, 
that would no more run on 2.6.

What would be the recommended way to install (compile) 2.6 on 12.04?