I think sage should advertise more that it can be viewed as a big library + modified but compatible python 2, i.e. all your weird file parsers just work. I am looking forward a lot to finally get python 3 compatibility, for that reason (write as much of my code as possibly to run on cpython as well, not just sage-python; possibility of using stuff where only python 3 bindings exist).
FWIW, although there are no binary releases that include Python 3 yet, if you build from scratch with ./configure --with-python=3 you can use Sage with Python 3 and you'll find that the vast majority of stuff works (though with no promises).
I think sage should advertise more that it can be viewed as a big library + modified but compatible python 2, i.e. all your weird file parsers just work. I am looking forward a lot to finally get python 3 compatibility, for that reason (write as much of my code as possibly to run on cpython as well, not just sage-python; possibility of using stuff where only python 3 bindings exist).