The code is for a basic calculator using the Python tkinter library. It creates a GUI interface with number buttons, mathematical operation buttons, and a display to show the results. The calculator supports basic mathematical operations like addition, subtraction, multiplication, and division. The operations are performed based on the user input and displayed on the display widget. The code uses object-oriented programming and defines a class called Calculator with methods to handle button clicks and mathematical operations. The main function creates an instance of the Calculator class and starts the GUI's main loop.
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