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Even the last

Number 84 is in array 2 times. First in index 9, second in index 16 and this program doesn't add 84 in lst. I can't understand what i must change in program.

def checkio(array): while True: try: lst = [] for i in array: if array.index(i)%2 == 0: lst.append(array.index(i))
sum1 = sum(lst) sum2 = sum1 * array[-1] return sum2 except IndexError: return 0

print(checkio([-37,-36,-19,-99,29,20,3,-7,-64,84,36,62,26,-76,55,-24,84,49,-65,41,41]))

Created: Jan. 26, 2016, 6:24 p.m.
Updated: March 3, 2016, 9:57 a.m.
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KIL