Printing. An idea for the station elementary, it would not be gradable though. Simply learning how to print in python could help with debugging. For example, if you had a really complicated piece of code and it wasn't functioning properly, you could easily just put in a few prints to check wether your program is getting to a point you want it to get to. And for more intermediate coders, you could show a broken function and ask the coder to try to fix it and suggest the print function for them to use.