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functions

Your Programming Toolbox

You’ve got Chapter 3 under your
belt. Let’s look back at what
you’ve learned in this chapter: CHAPTER 3

Programming T ools

* Avoid code duplication with functions.
* Parameters are variables that you can pass to

functions.
* Functions can return values.
* Computers use stack frames to record and

* When you call a function, a new stack frame is
track variables. Python T ools
created for the function to use.
* Stack frames (and local variables) are thrown

away when you exit a function.
* A variable is said to be “in scope” whenever it's

value can be seen by some code.
* Use “def" to create functions.
* Use return() to send a value
back to the code that called the
function.

* Pass parameters to functions by
placing them between parentheses.

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