The Choose block

One of many paths · in code: Switch / Case

What it does

Picks one path out of many, by comparing a value with each case in turn. If none match, it takes Otherwise.

Use it for

Menus (1, 2 or 3), days of the week, traffic light colours. Anything with more than two answers.

What to fill in

Choose by: The value to look at, usually one from an Ask block.
When it is…: The cases, one per arrow. Numbers like 1, words in quotes like "tea".

Try it

Open it in the editor, press Run, then change it and run it again.

ExampleTraffic light Try it

Start
Ask “Pick a colour: red, yellow or green” and store the answer in colour
Choose by colour
When it is "red" →
1. Tell "Stop!"
When it is "yellow" →
1. Tell "Get ready..."
When it is "green" →
1. Tell "Go!"
Otherwise →
1. Tell "That is not a traffic light colour."
End

You typegreenIt showsGo!

You typeblueIt showsThat is not a traffic light colour.

1colour = input("Pick a colour: red, yellow or green ")2if colour == "red":3    print("Stop!")4elif colour == "yellow":5    print("Get ready...")6elif colour == "green":7    print("Go!")8else:9    print("That is not a traffic light colour.")

Tips

A Choose block does the job of several Decisions in a row, and is much easier to read.

See it in use

Examples with the Choose block

Challenges that need it

Animal Sounds

Learn it in lesson 5Decisions: if this, then that

Goes with

Decision