@author jackzhenguo @desc @date 2019/2/15
12 四舍五入
四舍五入，ndigits代表小数点后保留几位：
In [11]: round(10.0222222, 3) Out[11]: 10.022 In [12]: round(10.05,1) Out[12]: 10.1
python-small-examples/md/12.md at master · data-python/python-small-examples
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