main lop in python tkinter

[deanhystad]

The function is not calling itself. That would quickly run into the maximum recursion limit and the program would crash. Instead print_it() is telling root to call print_it() 100 milliseconds from now.

The reason your implementation didn't work is because after() only schedules a function to run once. Your program called PrintIt() 10 milliseconds after the it root.after() call, and nobody ever scheduled it to run again.