Code works but doesn't seem to pass

I would like to give some feedback about ...

From: http://www.checkio.org/mission/even-last/solve/

HTTP_USER_AGENT:

Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36

def checkio(array): """ sums even-indexes elements and multiply at the last

"""

if len(array) == 0:
    return 0
else:
    sums = 0
    for num in array:
        if array.index(num) % 2 == 0:
            sums += num

return sums * array[-1]