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my code is not work
val = 0
def checkio(data):
    global val
    if len(data) > 0:
        val += data.pop()
        checkio(data)
   else:
       return val
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Created: Feb. 10, 2015, 8:55 a.m.
Updated: Feb. 10, 2015, 7:12 p.m.
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mitmafiy