Solving Problems in Python: Multiples of 3 and 5

Multiples of 3 and 5

If we list all the natural numbers below 10 that are multiples of 3 or 5, we
get 3, 5, 6 and 9. The sum of these multiples is 23.

Find the sum of all the multiples of 3 or 5 below 1000.

numbers = []
for n in range(1, 1000):
    if ((n / 3.0).is_integer()):
        numbers.append(n)
    elif ((n / 5.0).is_integer()):
        numbers.append(n)

print(sum(numbers))


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