Learn Python · lesson 16 of 24

Loops that decide

Print only the even numbers from 1 to 10, one per line.

Learn

Put an if inside a loop and the program can pick out only some items. n % 2 == 0 is True for even numbers, because they leave no remainder when divided by 2. Lines inside both need extra indent.

Your task

Print only the even numbers from 1 to 10, one per line.

← Repeating while something is true Lists: many values in one →

Python

Press Run to see what your program prints.

Keep going in Learn Python

Repeating with for

Print the numbers 1 to 5, one per line.

Start →14

Adding up in a loop

Add up the numbers 1 to 10 in a loop and print the total (it should be 55).

Start →15

Repeating while something is true

Start with n = 100 and keep halving it with n = n // 2 while n is bigger than 5. Print n at the end.

Start →

Practise the idea

🧱 Play Code Builder

The lines of a Python program are mixed up. Tap them into the right order, press Run and see if it works.

Play now

FAQ

Loops that decide: common questions

I am stuck. What can I do?

Press Hint for a nudge, read the message next to each goal, and compare your code with the lesson text. If you still need it, Show answer reveals a model solution. Try to type it yourself rather than copy it.

Does my work get saved?

Your ticks and XP are saved in this browser, and in your account if you log in. The code you type is not stored on a server.

Start a conversation

Enjoying coding? Meet a teacher.

Tell us the learner's age, country and what they would like to build, and we will suggest a class. A parent or guardian can make the enquiry.

Tell us the learner’s age or grade and goals
We’ll suggest a suitable class or learning path
We’ll confirm format, timing and fees with a parent or guardian

Play it, don't just read it

Write some code right now

Free games that need no sign-up. Pick one and play for five minutes.

All free games →

Pick a game

Today's maths challengeFive questions · the same for everyone today · keep your streak goingPlay