Lesson 16 of 20 · Repeating

Repeating — Part 16

Do the same step more than once.

What you'll learn

You will learn how loops repeat code multiple times and how range() controls how many times.

Words to know

Loop: A way to repeat the same steps multiple times without writing them again and again.
range(): Gives you a sequence of numbers (e.g. 0, 1, 2) so the loop knows how many times to run.
Repeat: To do the same thing more than once. Loops help us repeat.

Your turn

📋 Show the steps

Press ▶ Run and see what the computer says!

1Look at the 'for' line. It says: repeat the indented code a certain number of times. range(${Math.min(3 + Math.floor(n / 2), 8)}) means ${Math.min(3 + Math.floor(n / 2), 8)} times.
2The indented line (print) runs once for each number in range(). So it would print Step 1, Step 2, Step 3... up to Step ${Math.min(3 + Math.floor(n / 2), 8)}.
3Without a loop, you'd need to write ${Math.min(3 + Math.floor(n / 2), 8)} separate print() lines! Loops save you from repeating yourself.
4The 'i' variable counts which round we're on (starting from 0). That's why we write i + 1 to show Step 1 instead of Step 0.

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

Auto-run

Output

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Check your understanding · 1 of 5

What does a loop do?

Check your understanding · 2 of 5

How many times does this loop run? for i in range(3): print(i)

Check your understanding · 3 of 5

What does range(5) give you?

Check your understanding · 4 of 5

Which keyword starts a loop in Python?

Check your understanding · 5 of 5

What prints? for i in range(2): print("Hi")

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