如何总结数据框中的行？

Question

我创建了一个数据框df，如下所示：

          dates  counts1.22.171.gjj.csv  counts4.16.8.iei.csv  \
0     2003-01-01                       0                     0   
1     2003-01-02                       1                     1   
2     2003-01-03                       0                     0   
3     2003-01-04                       0                     0   
4     2003-01-05                       0                     0   
5     2003-01-06                       1                     0   
6     2003-01-07                       0                     0   
7     2003-01-08                       0                     1  

更多的行和列。我想将每一行的零和一加起来，这样我就得到了类似的东西：

          dates  counts  
0     2003-01-01     0                                          
1     2003-01-02     2                                          
2     2003-01-03     0                                        
3     2003-01-04     0                                          
4     2003-01-05     0                                         
5     2003-01-06     1                                      
6     2003-01-07     0                                          
7     2003-01-08     1

我使用df.sum(axis=1)并成为

0         0                                          
1         2                                          
2         0                                        
3         0                                          
4         0                                         
5         1                                      
6         0                                          
7         1 

如何在第二列中有日期并且有标题的地方变成期望的输出？

Answer 1

In [67]: df.assign(counts_sum=df.sum(axis=1))[["dates","counts_sum"]]
Out[67]:
       dates  counts_sum
0 2003-01-01           0
1 2003-01-02           2
2 2003-01-03           0
3 2003-01-04           0
4 2003-01-05           0
5 2003-01-06           1
6 2003-01-07           0
7 2003-01-08           1