为什么我的程序在文本文件中多次打印一个项目？

Question

我在修复代码时遇到了一些问题。当我运行程序一次时，程序会在我的文本文件中的一行上多次打印一个项目。

This is what happens when I run my code. The text file is so the user knows what items need to be restocked

This is my CSV file which is called 'blank file' and is attached to the variable blank. It is where the new stock levels are written

This is my original CSV file which holds all the product information

这是我的代码：

import csv
data=open('Product information.csv', 'rt')
purchase=csv.reader(data)
blank=open('Blank file.csv', 'wt', newline='')
blank_write=csv.writer(blank)
reorder=open('Reorders.txt', 'wt')

order=input('Please enter the GTIN-8 code of the product you would like to purchase: ')
quantity=int(input('Please enter the amount of this product you want to buy: '))
for row in purchase:
    GTIN=row[0]
    item=row[1]
    price=row[2]
    stock=row[3]
    reorder_level=row[4]
    target_stock=row[5]
    if order==GTIN:
        stock=int(stock)-quantity
    blank_write.writerows([[GTIN,item,price,stock,reorder_level,target_stock]])
data.close()
blank.close()
blank2=open('Blank file.csv', 'rt')
blank_write2=csv.reader(blank2)
choice=input('Please enter yes to check the current stock levels: ')
if choice=='yes':
    for row in blank_write2:
        for field in row:
            GTIN=row[0]
            item=row[1]
            price=row[2]
            stock=int(row[3])
            reorder_level=int(row[4])
            target_stock=int(row[5])
            if stock<=reorder_level:
                amount_to_restock=target_stock-stock
                reorder_file=('{} {} {} {} {} {} {}'.format(row[0]+'   ', row[1]+'   ', '{:10.2f}'.format(float(row[2]))+'   ', str(stock)+'   ', str(reorder_level)+'   ', str(target_stock)+'   ', str(amount_to_restock)))
                reorder.write(reorder_file)
blank2.close()
reorder.close()

除了那个问题外，一切都很好。