Maybe RedHat, but it's about it. Even Debian Stable comes with 2.5.
BTW this rant about impossibility to upgrade is a classic one and nonetheless wrong. You're perfectly able to install new versions of python, or perl or whatever given that you do that in /usr/local to keep the official version alongside the new one. I do this all the time, my system comes with perl 5.10 but I regularly install the newest releases in /usr/local, or even development versions. No problem.
BTW this rant about impossibility to upgrade is a classic one and nonetheless wrong. You're perfectly able to install new versions of python, or perl or whatever given that you do that in /usr/local to keep the official version alongside the new one. I do this all the time, my system comes with perl 5.10 but I regularly install the newest releases in /usr/local, or even development versions. No problem.