def mul(*x):
if len(x) == 0:
raise TypeError('请输入')
sum = 1
for i in x:
sum = sum*i
return sum
这样的话，如果是空值，那不就最后结果是1么
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與生懼來
def mul(*x):
if len(x) == 0:
raise TypeError('请输入')
sum = 1
for i in x:
sum = sum*i
return sum