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grouping products for sales

data = Item[Item['Bill No'].duplicated(keep=False)]

# Referenced: https://stackoverflow.com/questions/27298178/concatenate-strings-from-several-rows-using-pandas-groupby
data['Grouped'] = data.groupby('Bill No')['Item Name'].transform(lambda x: ','.join(x))
data2 = data[['Ending GST Bill No', 'Grouped']].drop_duplicates()
data2.head(10)

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