CODE,PRODUCT
101,item_1
101,item_1
101,item_2
102,item_3
103,item_2
104,item_5

{101:{'item_1':2, 'item_2':1},
102:{'item_3':1},
103:{'item_2':1},
104:{'item_5':1}

import csv
def csv_reader(file_obj):
    reader = csv.reader(file_obj)
    for row in reader:
        print(" ".join(row))
if __name__ == "__main__":
    csv_path = 'g.csv'
    with open(csv_path, "r") as f_obj:
        csv_reader(f_obj)

{101:{'item_1':2, 'item_2':1},
    102:{'item_3':1},
    103:{'item_2':1},
    104:{'item_5':1}