I also think about the fact that students want to write actual programs, rather than just code in terminal sessions. So it's okay to show some quick ideas in a

I also think about the fact that students want to write actual programs, rather than just code in terminal sessions. So it's okay to show some quick ideas in a terminal session, but my rule of thumb is that anything requiring indentation should be demonstrated through a short program file. This makes it easier to help students fix small errors, and it gives them practice working with many small program files.