Chapter 5
Making Choices

This chapter introduces another fundamental concept of programming: making choices. We do this whenever we want our program to behave differently depending on the data it’s working with. For example, we might want to do different things depending on whether a solution is acidic or basic, or depending on whether a user types yes or no in response to a call on built-in function input.

We’ll introduce statements for making choices in this chapter called control flow statements (because they control the way the computer executes programs). These statements involve a Python type that is used to represent truth and falsehood. Unlike the integers, floating-point numbers, and strings we have already seen, this type has only two values and three operators.