您可以join在以下时间申请专栏groupby：
df.groupby('index')['words'].apply(','.join)
例：
In [326]:
df = pd.DataFrame({'id':['a','a','b','c','c'], 'words':['asd','rtr','s','rrtttt','dsfd']})
df
Out[326]:
id words
0 a asd
1 a rtr
2 b s
3 c rrtttt
4 c dsfd
In [327]:
df.groupby('id')['words'].apply(','.join)
Out[327]:
id
a asd,rtr
b s
c rrtttt,dsfd
Name: words, dtype: object
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