def product(x=1,*num):
p = x
for y in num:
p = p*y
return p
====================
测试结果：
product(5) = 5
product(5, 6) = 30
product(5, 6, 7) = 210
product(5, 6, 7, 9) = 1890
测试失败!
原来是不需要默认值
product()
这句有默认值报的失败！
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金甲神将9528
def product(x=1,*num):
p = x
for y in num:
p = p*y
return p
====================
测试结果：
product(5) = 5
product(5, 6) = 30
product(5, 6, 7) = 210
product(5, 6, 7, 9) = 1890
测试失败!