Python is an OOP language, yet it does not always make sense to use OOP. For simple scripting tasks, the legacy waterfall coding style is still appropriate.
In this recipe, we will create a new GUI that mixes both the fall-down coding style with the more modern OOP coding style.
We will create an OOP-style class that will display a tooltip when we hover the mouse over a widget in a Python GUI, which we will create using the waterfall style.
Fall-down and waterfall coding styles are the same. It means that we have to physically place code above code before we can call it from the code below. In this paradigm, the code literally falls down from the top of our program to the bottom of our program when we execute the code.