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Python Basics › ListsPython Basics › LoopsChapter 5Lists, Functions and Projects
Keep many values in one list, wrap your code in functions, and put it all together in small projects.
Part of Python Programming · Foundations (chapter 5)
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Lists: Many Values in One Variable
So far, one variable held one value. A class has thirty marks, a shop has a hundred prices, and you cannot make a hundred variables. A list holds many values in one variable. In this course you make lists, read them by position and by slice, add, remove, replace and sort items, go through a list with a loop, and find totals, averages, the biggest and the smallest. You learn why a copy of a list is not what you expect, and how to make a table with a list inside a list. A marks tracker is the project at the end. The practice runs your code on real lists and tells you which results are wrong.
Functions: Name a Recipe
You have used functions made by others: print(), len(), range(). Now you write your own. A function is a group of lines with a name, so that you write them once and use them as often as you like. In this course you define and call a function, give it values to work with, get an answer back with return, set default values, make functions that answer yes or no, and let one function use another. You learn where a variable lives and why a variable made inside a function is not known outside it, and how to test a function with a table of cases. A toolbox of functions is the project at the end. The practice runs your functions on many inputs and tells you which ones fail.