Pandas groupby multiple columns, list of multiple columns

Question

I have the following data:

Invoice NoStockCode Description                         Quantity    CustomerID  Country
536365  85123A      WHITE HANGING HEART T-         


        

Answer 1

IIUC

df.groupby(['Invoice','CustomerID'],as_index=False)['Description','NoStockCode'].agg(','.join)
Out[47]: 
   Invoice  CustomerID                                        Description  \
0   536365       17850  WHITEHANGINGHEARTT-LIGHTHOLDER,WHITEMETALANTER...   
           NoStockCode  
0  85123A,71053,84406B