#这样product() = 1 有值，不对 def product(y): sum = 1 for n in y: sum = n sum return sum
#这样product()报错 才是对的 def product(x, y): for n in y: x = x n return x
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ferb2015
#这样product() = 1 有值，不对 def product(y): sum = 1 for n in y: sum = n sum return sum
#这样product()报错 才是对的 def product(x, y): for n in y: x = x n return x