The Python version included with RHEL 6 (that's the very latest version): 2.6 The Python version included with RHEL 5 (still widely used): 2.4
Thank them for forcing us to keep supporting old versions.
RHEL and its free variants, notably CentOS and Scientific Linux. The Python version mess is a HUGE issue in the academic sciences. The users I support, astrophysicists, are using a lot of Python and it's a gigantic mess.
"Take that, you hostile sons-of-bitches!" -- James Coburn, in the finale of _The_President's_Analyst_