Python 如何使用pandas将列中的值更改为正值，并将舍入更改为单个小数点

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您可以使用abs内部的圆形功能来执行此操作：

    strain   Standardforce   stress    percentage
1   10.400000   24400.0     2.750646        20.8
2   10.400000   24200.0     2.728100        20.8
3   10.400000   24100.0     2.716826        23.8
4   10.400000   23900.0     2.694280        20.8

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df['percentage']=df.percentage.abs（）.round（1）

    strain   Standardforce   stress    percentage
1   10.400000   24400.0     2.750646        20.8
2   10.400000   24200.0     2.728100        20.8
3   10.400000   24100.0     2.716826        23.8
4   10.400000   23900.0     2.694280        20.8

>>> df.percentage = df.percentage.apply(lambda x: abs(round(x, 2)))
>>> df
   strain  Standardforce    stress  percentage
1    10.4        24400.0  2.750646        20.8
2    10.4        24200.0  2.728100        20.8
3    10.4        24100.0  2.716826        23.8
4    10.4        23900.0  2.694280        20.8