Python lesson

Loops with if

The loop visits 70, 15, 24 and 140. Only 70 and 140 pass the test, so only they are printed. The print is indented twice: it's inside the if, which is inside the loop.

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Example

Put an if inside a loop, and the test runs once for every item:

orders = [70, 15, 24, 140]
for o in orders:
    if o > 50:
        print(f"{o} is big")

Output:

70 is big
140 is big

Key points

for o in orders:The loop visits every item.

if o > 50:Inside the loop, the test runs for each item.

print(o)Indented twice: only runs when the test is True for that item.

Indentation shows what's inside what: the if is inside the loop, and the print is inside the if.

Practice

Try each one in your head first, then open the answer.

1. Build the test inside the loop: is the order over 50?

if o > 50:

2. Build the loop line over the orders list.

for o in orders:

3. Loop through orders and print only the ones over 50.

orders = [70, 15, 24, 140, 30, 105]
for o in orders:
    if o > 50:
        print(o)

4. Print every product that isn't Charger.

products = ["Earbuds", "Charger", "Cable", "Charger"]
for p in products:
    if p != "Charger":
        print(p)

5. Count how many orders are over 50 with a loop, then print the count.

orders = [70, 15, 24, 140, 30, 105]
count = 0
for o in orders:
    if o > 50:
        count = count + 1
print(count)

Learn it by doing. This lesson is a short hands-on level on Bampaa: see it work, then build and write it yourself, with instant feedback.

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About 5–10 minutes · no sign-up needed