は、インデックスエラーが発生している私は

Question

を修正する方法がわからない、私は他の場所でサイトにこのコードを見つけましたが、私は同じエラーメッセージが出続ける何らかの理由：

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

私はこれを修正する方法がわかりませんよどんな助けもありがとう、ありがとう。

これはコードです：

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 \t\tDesc. \t\tStock \t\tValue') 
      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() 

Answer 1

「」少なくとも、あなたのファイルの1行が3以上を持っていない、あなたの入力ファイル「stockfile.txt」をご確認ください。または、データ間に空白行があります。