This chapter wrapped up our coverage of built-in comprehension and iteration tools. It explored list comprehensions in the context of functional tools, and presented generator functions and expressions as additional iteration protocol tools. As a finale, we also summarized the four forms of comprehension in Python today—list, generator, set, and dictionary. Though we’ve now seen all the built-in iteration tools, the subject will resurface when we study user-defined iterable class objects in Chapter 30.

The next chapter is something of a continuation of the theme of this one—it rounds out this part of the book with a case study that times the performance of the tools we’ve studied here, and serves as a more realistic example at the midpoint in this book. Before we move ahead to benchmarking comprehensions and generators, though, this chapter’s quizzes give you a chance to review what you’ve learned about them here.