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An AI assistant wrote parse_and_sum(items) to add up a list of strings that represent integers, described as supporting 'any numeric expression.' It handles plain numbers fine — the concern is what tool it reached for, and what happens on bad input.
View the authored lesson overview →parse_and_sum(['3', '5', '2']) is 10. parse_and_sum(['-2', '4']) is 2. parse_and_sum([]) is 0. parse_and_sum(['abc']) must raise ValueError.