Python Basics · Control Flow · Lesson 10 of 36
while Loops
Concept
while Loops
while loops repeat as long as a condition is true. Remember to update the condition or you will loop forever.
break exits a loop immediately, and continue skips to the next iteration — both work in while and for loops alike.
By the end of this lesson
- Explain the core idea behind while Loops.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Syntax
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in while Loops. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Write a while loop that counts down from 5 to 1.
Need a nudge?
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
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Console