Just a relatively simple calculator using the Tkinter GUI. It has a few nice features such as correcting division by an integer (for older Python versions), error trapping, to and from memory buttons, and an editable display. The editable display allows you to backspace mistakes, and also to enter things not on the key pad, like hexnumbers. For instance if you enter 0xFF and press equals, it will give you the decimal (denary) equivalent of 255
The program also has a guard against the bad guys that like to abuse the underlying eval() function to wipe out files.
I wrote the code in detail, so you can hopefully figure it out. You can fancy up the calculator quite a bit, just experiment with the code.
See also the updated version at ...