4 / 27

Lesson 4 — if / else

Making decisions

if runs a block only when a condition is true; else covers every other case. A condition is any expression that is True or False, like age >= 18.

Why it matters: decisions are how programs react differently to different data instead of always doing the same thing.

Watch out: in Python the indented spaces under if and else are not decoration — they define which lines belong to each branch.

Want it another way?

Task

Set age to 15 and run it — the program should print: minor. (>= means "greater than or equal to".)

Run your code — when the output matches the task, you will see a green check. Then mark the lesson complete.

Test your knowledge

A quick 3-question quiz on this lesson — instant feedback.

Enjoying this lesson? Share it.