Python ValueError：关闭文件的I / O操作

Question

import csv

shop_products=' '
total_price=0.00

RECIEPT_FILE=open('reciept.txt', 'wt')

while True:
    GTIN_code=input('Please enter the GTIN-8 code of the product that you would like to purchase or simply press the enter key if you do not')
    if GTIN_code == '':
      break
    shop_products=open('Product.csv', 'rt')
    data_in_file=csv.reader(shop_products)
    for row in data_in_file:
        for field in row:
            if field==GTIN_code: 
                quantity=int(input('How many of the products do you want to purchase'))
                subtotal_price=float(row[2])*quantity
                total_price=total_price+subtotal_price
                RECIEPT_FILE.write(row[0]+' '+row[1]+' '+str(quantity)+' '+'£'+row[2])
                RECIEPT_FILE.close()
RECIEPT_FILE.write('Your total price of all your purchases is '+str(total_price))
RECIEPT_FILE.close()

这里我试图通过将GTIN-8代码写入文本文件来制作收据，但每当我运行程序时，它都会报告此错误：

Traceback (most recent call last):
  File "C:\Users\Ahmed\Documents\Task 2 test code\Products reciept generator - Copy.pyw", line 20, in <module>
    RECIEPT_FILE.write(row[0]+' '+row[1]+' '+str(quantity)+' '+'£'+row[2])
ValueError: I/O operation on closed file.

我在python 3.2中工作。

Answer 1

查看循环的最后一行，从底部开始第三行：第一次写入时关闭文件。你下一次写的是非法的。

删除该行;让程序的最后一行执行您的操作，只有关闭。