Question: 
Write a function to return the sum of all divisors of a number.


Model's Code:
def sum_div(n):
    return sum(i for i in range(1, n) if n % i == 0)



Sample Correct Code:
def sum_div(number):
    divisors = [1]
    for i in range(2, number):
        if (number % i)==0:
            divisors.append(i)
    return sum(divisors)


Asserts:
assert sum_div(8)==7
assert sum_div(12)==16
assert sum_div(7)==1


Tests:
Test 1 of 3: PASS
Test 2 of 3: PASS
Test 3 of 3: PASS

Test 295 of 974: 214/295 (72.54237288135593%): success