Sure! We are using the built in python 'tkinter' library which enables us to create a graphical user interface (GUI).

First, we create a class 'Calculator'. The '__init__' is the constructor function. It creates the entry widget and the necessary buttons. Finally the constructor places the buttons in the appropriate places on the grid. 

After this we define all the methods that are responsible for the functionality of the buttons such as adding and multiplying. Please note that we used these functions while creating the buttons (the 'command' parameter).

Finally we create the 'Calculator' object and start the main loop.
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