I feel none of those are very strong arguments; keeping support for 2.6 is a minor burden (mainly thanks to the automatic tests in Travis), and there is only a limited set of new features that are of use to us - mainly OrderedDict and UnitTest, but those have been backported as pypi packages. Maybe we would also be interested in argparse (also a backport available).

This is in stark contrast to 2.5 vs 2.6: 2.6 introduced several features that are very important for moving to Python 3: relative imports, print-as-a-function, exception handling, byte literals... basically everything to allow for hybrid code that runs on both Python 2 (.6+) and 3 (.2+). Python 3.3 made this even easier by re-allowing the u'' prefix.

Merlijn