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Я нашел этот код в другом месте на сайте, но по какой-то причине я продолжаю получать одно и то же сообщение об ошибке:

 products[row[0]] = [row[1], row[2], row[3]]
IndexError: list index out of range.
  

Я не уверен, как это исправить, любая помощь приветствуется, спасибо.

Это код:

 MAX_FIELD_LEN = 8

def main():
    products = {}
    product_location  = {}
    location = 0
    # This is the file directory being made.
    with open('stockfile.txt', 'r ') as f:
        # This is my file being opened.

        for line in f:
            # keep track of each products location in file  to overwrite with New_Stock
            product_location[line.split(',')[0]] = location
            location  = len(line)
            # Need to strip to eliminate end of line character
            line = line[:-1]
            # This gets rid of the character which shows and end of line 'n'
            row = line.split(',')
            # The row is split by the comma
            products[row[0]] = [row[1], row[2], row[3]]
            # The products are equal to row 1 and row 2 and row 3. The GTIN is going to take the values of the product and price so GTIN 12345678 is going to correspond to Fridge and 1.

        print(products)
        total = 0

        while True:
            GTIN = input('Please input GTIN: ')
            # To terminate user input, they just need to press ENTER
            if GTIN == "":
                break
            if (GTIN not in products):
                print('Sorry your code was invalid, try again:')
                break

            row = products[GTIN]
            description, value, stock = row
            print('Stock data: ')
            print('GTIN ttDesc. ttStock ttValue')
            print(GTIN,'t',description,'t', stock, 't', value)

            quantity = input('Please also input your quantity required: ')
            row[2] = str(int(stock) - int(quantity))
            product_total = int(quantity) * int(value)
            for i in range(len(row)):  
                row[i]  = row[i].rjust(MAX_FIELD_LEN)
            New_Stock = GTIN.rjust(MAX_FIELD_LEN)   ','   ','.join(row)   'n'
            #print(New_Stock, len(New_Stock))
            f.seek(product_location[GTIN])
            f.write(New_Stock)
            print('You bought: {0} {1} nCost: {2}'.format(GTIN, description, product_total))

            total = total   product_total
        f.close()
        print('Total of the order is £%s' % total)

main()
  

Пожалуйста, проверьте свой входной файл ‘stockfile.txt ‘, по крайней мере, в одной строке вашего файла нет 3 или более «,». Или у вас есть несколько пустых строк между вашими данными.