Lesson 1 of 20 · Steps in Order

Steps in Order — Part 1

Do things step by step.

What you'll learn

You will learn that code runs top to bottom in order, and that changing the order changes the result.

Words to know

Sequence: A list of steps that happen one after another in order.
Order: The sequence in which steps run. Changing the order can change the result.
print(): A command that shows a message on the screen.

Your turn

📋 Show the steps

Press ▶ Run and see what the computer says!

1Read the code above. Notice how each print() is on its own line — the computer reads them top to bottom, one after another.
2The output would be: Step 1, Step 2, Step 3, Done! — in that exact order. The order of lines decides the order of output.
3Imagine swapping Step 2 and Step 3. The output would change! In a sequence, order matters.
4A sequence is a list of instructions in order. Every program is built from sequences. You just learned the most basic building block of coding!

Auto-run is on: change the code and the result updates by itself.

Auto-run

Output

Loading Python... This may take a few seconds.

Check your understanding · 1 of 5

What does this code print first? print("A") print("B") print("C")

Check your understanding · 2 of 5

In a sequence, what matters most?

Check your understanding · 3 of 5

How many lines will print? print("1") print("2") print("3")

Check your understanding · 4 of 5

What is a sequence in coding?

Check your understanding · 5 of 5

What prints last? print("Start") print("Middle") print("End")

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