Loops · warm-up

Add up to n

Write sum_to(n) that returns 1 + 2 + … + n using a loop. sum_to(4) is 10, and sum_to(0) is 0.

def sum_to(n):
    total = 0
    for i in range(n):
        total = total + i
    return total

Run adds print(sum_to(4)) after your code, to try it.

Stuck on the idea rather than the code? The Doing it again lesson walks through it.