py df groupby并获取字符串的值

Question

我需要在'ProductID'列上对df进行分组，并将结果值从'Feature'填充到'Combo'作为字符串，避免重复“

Input dataframe looks like this

Resulting dataframe should look like this

申请groupby后，我无法弄清楚接下来的步骤

  

df['Combo']=pd.Series(df.groupby('ProductID')['Feature'])