Where is it? Find the tutorial at: https://www.simplifiedpython.net/python-calculator/
What is it?You'll learn how to create a GUI with the
tkinter Python library as well as working with simple mathematical calculations.
What do you need to follow? You'll need a basic understanding of the Python programming language. You will also need the Python program installed on your computer or you can use an online IDE like Repl.it and run everything in your browser.