Description

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Beginner · 10 min

Totals in a loop

Accumulate a running total while processing a list.

Keep a running total

Set a total to zero before the loop. Add each item to it inside the loop. Resetting the total inside the loop would lose earlier additions.

prices = [4, 7, 2]
total = 0
for price in prices:
    total = total + price
print(total)

Output

13

Add only matching items

+= adds to the current value. Combine a loop with an if to include only the items you want. Indent the addition inside the condition.

prices = [4, 7, 2]
total = 0
for price in prices:
    if price >= 4:
        total += price
print(total)

Output

11

Totals in a loop

  1. Write the total after each iteration.
  2. Keep the initial value outside the loop.

Try it yourself

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Total a basket

Add all values in prices using a loop. Save the sum in total and display it once after the loop.

Practice