In this chapter, we covered dictionaries and their types (the default, unordered dict, and the specialized OrderedDict). We also looked at attributes defined on dictionary objects and their use cases; for example, update and setdefault. Using these attributes, we learned how to iterate through dictionaries and modify them to achieve particular goals.
We also covered sets in this chapter, which are collections of unique and unordered items. We covered operations that you can perform on sets, such as finding unions and intersections, and other specialized operations, such as finding the difference and symmetric difference. We also looked at what frozen sets are, and the potential uses for them.
In the next chapter, we will begin our journey into object-oriented programming with Python, and we will look at how Python implements OOP concepts, such as classes and inheritance.