Pandas pivot table百分比计算

时间:2016-05-10 20:53:54

标签: python-3.x pandas pivot-table percentage

给出以下数据框和数据透视表:

import pandas as pd
df=pd.DataFrame({'A':['x','y','z','x','y','z'],
                 'B':['one','one','one','two','two','two'],
                 'C':[2,18,2,8,2,18]})
df

    A   B       C
0   x   one     2
1   y   one     18
2   z   one     2
3   x   two     8
4   y   two     2
5   z   two     18

table = pd.pivot_table(df, index=['A', 'B'],aggfunc=np.sum)

            C
A   B   
x   one     2
    two     8
y   one     18
    two     2
z   one     2
    two     18

我想在此数据透视表中添加2列;一个显示所有值的百分比,另一个显示A列中的百分比,如下所示:

           C    % of Total  % of B
A   B
x   one    2    4%          10%
    two   18    36%         90%
y   one    2    4%          20%
    two    8    16%         80%
z   one    2    4%          10%
    two   18    36%         90%

额外信用:

我想要一个底部摘要行,其中包含C列的总和(如果接下来的2列也有100%,那就没问题了,但这些都没有。)

1 个答案:

答案 0 :(得分:18)

您可以使用:

table['% of Total'] = (table.C / table.C.sum() * 100).astype(str) + '%'
table['% of B'] = (table.C / table.groupby(level=0).C.transform(sum) * 100).astype(str) + '%'
print table
        C % of Total % of B
A B                        
x one   2       4.0%  20.0%
  two   8      16.0%  80.0%
y one  18      36.0%  90.0%
  two   2       4.0%  10.0%
z one   2       4.0%  10.0%
  two  18      36.0%  90.0%

但是对于真实数据,我认为不推荐使用int,最好使用round

额外信用:

table['% of Total'] = (table.C / table.C.sum() * 100)
table['% of B'] = (table.C / table.groupby(level=0).C.transform(sum) * 100)
table.loc['total', :] = table.sum().values
print table
              C  % of Total  % of B
A     B                            
x     one   2.0         4.0    20.0
      two   8.0        16.0    80.0
y     one  18.0        36.0    90.0
      two   2.0         4.0    10.0
z     one   2.0         4.0    10.0
      two  18.0        36.0    90.0
total      50.0       100.0   300.0