def mul(*mm):
... s = 1
... for n in mm:
... sum = s*n
... return sum
你的运行后是测试失败的，应该是sum和s混用了，还有至少是一个数乘积，最后一步测试mul()会测试
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def mul(*mm):
... s = 1
... for n in mm:
... sum = s*n
... return sum