Code below has 1 major and 1 minor problem. Major issue is, once you push the button it visually stays pushed. Minor problem is, I run this in Cygwin. I've got an rxvt window behind the Tk window.

A Tkinter application begins with a root window and uses widgets such as labels, buttons, and text fields. Geometry managers like pack (), grid (), and place () control layout, while event bindings ...