Actually, I prefer the inner part of the loops negative z-indexed (but you can image how it could flip as you move the caret around):
for line in file: for line in file:
print line print line
print "all done!" print "all done!"
However, staring at an IDE cross-eyed while trying to program sounds like a punishment one might cook up for devs who bundle Browser Toolbar Adware with screensaver packages that my mum likes to install, and not something I'd choose for myself.
In university, I did some research into Multi-Level Displays (essentially a transparent LCD a few millimetres in front of a standard LCD screen), but what held the tech back for consumer applications was that we hadn't yet found a killer app. (In contrast, the gambling industry loved them, and I see them often in Casinos in Vegas).
But it seems like it would be a perfect application for fake 3d IDEs.