pandas：组合行中的文本

Question

来自以下数据框;

data1 = pd.DataFrame({'Section':[1,1,1,2,2,2,2],'Sub':['What','is','this?','I','am','not','sure.']})

如何获得与此类似的结果;

['What is this?','I am not sure.']

到目前为止，我只能提出像这样的groupby;

for d in data1.groupby(['Section'])['Sub']:
    print d[1]

给你这样的东西;

0     What
1       is
2    this?
Name: Sub, dtype: object
3        I
4       am
5      not
6    sure.
Name: Sub, dtype: object

Answer 1

join有空格的项目：

In [34]: for d in data1.groupby(['Section'])['Sub']:
    ...:     print ' '.join(d[1])
What is this?
I am not sure.

并将它们列为一个列表：

In [35]: [' '.join(d[1]) for d in data1.groupby(['Section'])['Sub']]
Out[35]: ['What is this?', 'I am not sure.']