在多个文件中，使用grouped.sum()做同index加和之后，会出现多位小数点的情况，这样的情况怎么处理，不能用float（SERIES)强制格式化这个series
This shows that the data format in Series is originally floator use astypefunction to convert the type
astype
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This shows that the data format in Series is originally float
or use
astypefunction to convert the type