Comment 3 for bug 1247132

I think mostly my comment in bug 1219223 comment 3 [1] covers my response.
I also have interest in python3. I do not expect to move cloud-init in Ubuntu off python2 for 14.04, but would be very happy if it supported both by then.

So, things to cover with respect to cheetah are:
 * support backwards compatible parsing (do not need to support any wheres near all of cheetah function,
 but need to support $MIRROR and other simple places)
 * declare in the format template ie, either 'startswith("#templatetypehere\n")' or possibly searching by file extension.

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[1] https://bugs.launchpad.net/cloud-init/+bug/1219223/comments/3 mostly stands.