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Message: [QUOTE="Rotwang, post: 5104040"] I assume you meant to put "result = start" in there at the beginning. It's not quite clear to me what the OP's intentions are in the general case, but calling supersum(item, start) seems odd - for example, is the following desirable? 22 I would have thought that the "correct" answer would be 10. How about the following? def supersum(sequence, start = 0): result = start for item in reversed(sequence): try: result = supersum(item, result) except: result = item + result return result [/QUOTE]