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Python Basics › LoopsChapter 4Loops: Doing Things Again and Again
Repeat work with for loops over a range or a list, and with while loops that run until something changes.
Part of Python Programming · Foundations (chapter 4)
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Repeat with for: Loops
A computer does not get tired. A loop lets it repeat the same lines a hundred, a thousand or a million times, while you type them only once. In this course you learn the for loop, the range() function that makes a row of numbers, how a loop builds an answer such as a sum, a count or a factorial, and how to put one loop inside another to make tables and patterns. A project at the end prints a multiplication table book. The practice runs your loops and tells you which results are wrong.
Repeat Until: while Loops
A for loop is for a number of rounds that you know. A while loop is for the cases where you do not know: keep saving until there is enough, keep asking until the answer is right, keep going until something happens. In this course you write while loops, learn what makes them stop, leave a loop early with break, skip a round with continue, and ask the user again and again. A lesson on the loops that go wrong shows how to choose between for and while, and how to find an endless loop and a loop that is off by one. A guessing game with hints and a limit of tries is the project. The practice runs your loops and tells you which results are wrong.