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Chapter Summary
In this chapter, we studied one of two key concepts related to functions: scopes (how variables are looked up when they are used). As we learned, variables are considered local to the function definitions in which they are assigned, unless they are specifically declared to be global or nonlocal. We also studied some more advanced scope concepts here, including nested function scopes and function attributes. Finally, we looked at some general design ideas, such as the need to avoid globals and cross-file changes.
In the next chapter, we’re going to continue our function tour with the second key function-related concept: argument passing. As we’ll find, arguments are passed into a function by assignment, but Python also provides tools that allow functions to be flexible in how items are passed. Before we move on, let’s take this chapter’s quiz to review the scope concepts we’ve covered here.
