在python中实现对list求和及求积

如下所示：

# the basic way
s = 0
for x in range(10):
s += x

# the right way
s = sum(range(10))

# the basic way
s = 1
for x in range(1, 10):
s *= x

# the other way
from operator import mul
reduce(mul, range(1, 10))

来源：https://blog.csdn.net/qianggezhishen/article/details/46532441