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Enumerations

Enumerations are somewhat less popular data structures in Python. They are quite similar to named tuples, as they are immutable and their attributes are named. Enumerations also have one interesting property: they are always singletons. In other words, you can't have more than one instance of an Enum class at the same time. With that, enumerations work well as semantic layers (aliases) for a set of specific values; for example, for categories, we can define colors in the palette, aliasing specific implementation. The singleton property means that the value will always be exactly the same throughout the code. 

In the following example, we define an Enum class for the color theme. Our Enum object supports three colors: MAIN,