Skipping elements in a List Python

Question

I\'m new to programming and I\'m trying to do the codingbat.com problems to start. I came across this problem:

Given an array calculate the sum except when there is

Answer 1

Use a while loop to walk through the list, incrementing i manually. On each iteration, if you encounter a 13, increment i twice; otherwise, add the value to a running sum and increment i once.

def skip13s(l):
    i = 0
    s = 0
    while (i < len(l)):
        if l[i] == 13:
            i += 1
        else:
            s += l[i]
        i += 1
    return s