python - 根据另一列的顺序将字符串与 pandas GroupBy 连接起来

Question

我的数据框有以下数据

callerid  seq   text
1236     2      I need to talk to x
1236     6      Issue 3 is this
1236     3      This is regarding abc
1236     5      Issue 2 is this
1236     4      Issue 1 is this
1236     1      Hi
1347     2      I need to talk to x
1347     6      Issue 3 is this
1347     3      This is regarding abc
1347     5      Issue 2 is this
1347     4      Issue 1 is this
1347     1      Hi

我需要按callerid对数据进行分组，按seq排序，连接文本并写入另一个数据框

最终输出的数据应该是这样的

callerid        text    
1236            Hi I need to talk to X This is regarding abc Issue 1 is this Issue 2 is this Issue 3 is this    
1347            Hi I need to talk to X This is regarding abc Issue 1 is this Issue 2 is this Issue 3 is this

我试过下面的代码

documentext = dataextract.sort_values(['callerid','seq']).groupby('callerid')

documenttext1 = documenttext[['callerid','text']]
documentext1 = (documenttext1.groupby('callerid')['text']
       .apply(lambda x: ' '.join(set(x.dropna())))
       .reset_index())

第一个语句没有给我完整的排序文本这是我得到的输出

callerid seq   text
1236     1     Hi
1236     2     I need to talk to x
1236     3     This is regarding abc
1347     1     Hi
1347     2     I need to talk to x
1347     3     This is regarding abc

在此感谢任何帮助

提前致谢

Answer 1

如你所料，第一步是排序，第二步是分组。您可以使用 ' '.join 作为 aggfunc 来连接您的字符串。

(df.sort_values('seq')
   .groupby('callerid', sort=False)['text']
   .agg(' '.join)
   .reset_index())

   callerid                                               text
0      1236  Hi I need to talk to x This is regarding abc I...
1      1347  Hi I need to talk to x This is regarding abc I...

您不应该对“seq”进行分组，因为您正试图对其 进行聚合。