Secondary Calculator Button Function - Python Kivy GUI Tutorial #17

In this video we'll build out secondary buttons for our calculator app with Kivy and Python.

So let's build out the "+/-", the ".", and the "<<" buttons for our calculator.

The "+/-" button will toggle our textbox numbers positive or negative, the "." button will add a decimal to our number, and the "<<" button will remove the last number from the text box.

These are pretty basic buttons and we should be able to knock them out in just a few minutes!

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