FAQ: Learn Python – Lists and Functions – Printing out a list item by item in a function


This community-built FAQ covers the “Printing out a list item by item in a function” exercise in Codecademy’s lessons on Python.

FAQs for the Codecademy Python exercise Printing out a list item by item in a function:

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7 posts were split to a new topic: List index out of range


why this function has no return?


It does not need a return, since it has nothing to return. The purpose is in the name, print_list, which is the operation the function performs.


so we should not necessarily return sth in defining a function?


Functions are a way of composing a piece of useful code that can be re-used over and over with variable parameters to produce an expected result given the inputs. Some functions do not act upon the data, but simply output it, or report it. Their job, as in the above case is over and done once the function has run. No states are changed. They have no effect on the data.

function add_ab(a, b) {
    return a + b;

The above function also does not affect any data, but simply reports a sum of two data points, which are returned so the sum can be carried forward in other program operations, as needed…

function add_list_item(lst, item) {

The above does affect the data since the inputed list has had a new value added to it. It does not need to return the list since it already exists outside of the function. lst is merely a reference to that list which could be any list under any name.

In time, this will all make perfect sense once you have more experience and new concepts under your belt.


Using map() has an issue with len