invoice.py

import collections
itemData = collections.defaultdict(list)

print('Reading rows...')
for row in range(10, 19):
	# Each row in the spreadsheet has data for one item.
	item  = sheet['A' + str(row)].value
        itemData['item'].append(item)

        description = sheet['C' + str(row)].value
        itemData['description'].append(description)

        ordered = sheet['J' + str(row)].value
        itemData['ordered'].append(ordered)

        invoiced = sheet['M' + str(row)].value
        itemData['invoiced'].append(invoiced)

        rate = sheet['N' + str(row)].value
        itemData['rate'].append(rate)

        barcode = sheet['P' + str(row)].value
        itemData['barcode'].append(barcode)

        amount = sheet['R' + str(row)].value
        itemData['amount'].append(amount)

        print('{0: <16}'.format(item) + '{0: <24.20}'.format(description) +
		'{0: <4}'.format(ordered) + '{0: <3}'.format(invoiced) +
		'{0: <3}'.format(invoiced) + '{0: <13}'.format(barcode) +
                '{0: <4}'.format(amount))