I want to learn to program in Python because it is a cross-platform
programming language. I managed to make some simple Python programs. But it is
difficult to use Tkinter. Until now I have not managed to make a single useful
program, for example one that displays the result of a calculation by clicking
on a command button just like in Visual Basic. Please tell me how to make such
buttons with commands. I can put only very simple ones. The Tkinter tutorials do
not seem to be very helpful.