df.apply

http://www.cnblogs.com/wuzhiblog/p/python_new_row_or_col.html

 

DataFrame數據預覽：

          A B C D E 0 0.673092 0.230338 -0.171681 0.312303 -0.184813 1 -0.504482 -0.344286 -0.050845 -0.811277 -0.298181 2 0.542788 0.207708 0.651379 -0.656214 0.507595 3 -0.249410 0.131549 -2.198480 -0.437407 1.628228

計算各列數據總和並作為新列添加到末尾

df['Col_sum'] = df.apply(lambda x: x.sum(), axis=1)

計算各行數據總和並作為新行添加到末尾

df.loc['Row_sum'] = df.apply(lambda x: x.sum())

最終數據結果：

                A B C D E Col_sum 0 0.673092 0.230338 -0.171681 0.312303 -0.184813 0.859238 1 -0.504482 -0.344286 -0.050845 -0.811277 -0.298181 -2.009071 2 0.542788 0.207708 0.651379 -0.656214 0.507595 1.253256 3 -0.249410 0.131549 -2.198480 -0.437407 1.628228 -1.125520 Row_sum 0.461987 0.225310 -1.769627 -1.592595 1.652828 -1.022097