Opinions for supported Python versions?

At this point I'm not sure it's exactly clear what Python versions are
supported, and I don't know off the top of my head if there's on
official requirement. I believe my releases have included dependencies
on Python 2.4, and some of my recent commits depend on Python 2.5
features.

Certainly supporting versions up to 2.7.x is desirable (and any future
2.x versions, though I *think* 2.7 is expected to be the last in the
Python 2 line), and supporting 3.x is impractical until some significant
work is put into converting the entire code base.

So the main question is the minimum supported version. Python 2.5 was
released in September of 2006, and is available in Debian's "oldstable"
release (Lenny) from February 2009. Since Debian has a reputation for
old software in its stable releases, something that's available as far
back as it's previous stable release seems more than reasonable.

Python 2.6 seems reasonably widespread at this point, and was released in
October 2008. It's also the default version in the current Debian
release.

My suggestion for now is to make 2.5.x to 2.7.x the supported versions,
with the intention of dropping 2.5.x in the not-to-distant future.

Does anyone feel that support for versions as old as 2.4.x is still
necessary? Or that 2.5.x will be necessary for an extended period of
time?

-Kevin

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