@author jackzhenguo @desc @date 2019/2/20
20 求和函数
求和：
In [181]: a = [1,4,2,3,1] In [182]: sum(a) Out[182]: 11 In [185]: sum(a,10) #求和的初始值为10 Out[185]: 21
python-small-examples/md/20.md at master · bubbleReset/python-small-examples
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