The Accumulator Pattern and range()

How does the accumulator pattern collapse a running sum into one tidy `for` loop — and where does an off-by-one `range` quietly bite?

Finger exercises

Short drills on what this video just taught. Write the code, run the checks, and reveal the answer only if you are stuck.

0 / 5 passed

Exercise 1 of 5

The accumulator total is already started at 0 for you.

Use a for loop and the accumulator pattern to add up every integer from 0 through 9, leaving the result in total.

total = 0
# your code here — use a for loop to add each value into total

total = 0
# your code here — use a for loop to add each value into total

Python runs in your browser

⌘/Ctrl + Enter runs

total is a number

adds up every integer from 0 through 9