Disable line wrapping and horizontal scrolling for output in iTerm
I believe this is not possible without using fullscreen mode - vim is using fullscreen mode (python -c 'print "\x1b[?1049h"') which disables vertical scrolling as well, which isn't what I want (though this wasn't clear in the question).

Also, it turns out this behavior isn't specific to terminal.app - it's how all the terminals I've tried work.