Question

非常感谢你的帮助。我想以这种格式打印出订单：

85791008     Mango-1           £1     3    £3
86139113    Strawberries-500g  £1.50  2    £3
Total cost of order:                       £6

这是我的代码：

import csv

option='yes'
user_orders=[]
final_price=0.00

while option=='yes':
    data=open('Product information.csv', 'rt')
    purchase=csv.reader(data)
    order=input('Please enter the GTIN-8 code of the product you would like to purchase: ')
    for row in purchase:
        for field in row:
            if order in field:
                quantity=int(input('How much of that item: '))
                final_price=quantity*float(row[2]) + final_price
                receipt=('{} {} {} {} {}'.format(row[0]+'     ', row[1]+'     ', str(quantity)+'     ', "{:10.2f}".format(float(row[2]))+'     ', "{:10.2f}".format(quantity * float(row[2]))))
                user_orders.append(receipt)
                print('You have added '+(receipt))
                option=input('Would you like to add another iem to your order, yes or no: ')
                if option=='no':
                    for user_order in user_orders:
                        print('\n' + user_order)
                    print('\nTotal cost of order:                                                 '+ "{:10.2f}".format(final_price))

如何编辑此内容以顶部格式打印出来？

Answer 1

你的代码的主要问题是你已经在循环中声明了默认变量，并且它们在每次迭代时都会重置（final_price，user_orders）。除此之外，格式化搞砸了，你已经使用了int类型的价格，这不是一个好主意。当csv文件中的价格具有浮点时出错。

import csv

option='yes'
user_orders=[]
final_price=0.00

while option=='yes':
    data=open('Product information.csv', 'rt')
    purchase=csv.reader(data)
    order=input('Please enter the GTIN-8 code of the product you would like to purchase: ')
    for row in purchase:
        for field in row:
            if order in field:
                quantity=int(input('How much of that item: '))
                final_price=quantity*float(row[2]) + final_price
                receipt=('{} {} {} {} {}'.format(row[0]+'     ', row[1]+'     ', str(quantity)+'     ', "{:10.2f}".format(float(row[2]))+'     ', "{:10.2f}".format(quantity * float(row[2]))))
                user_orders.append(receipt)
                print('You have added '+(receipt))
                option=input('Would you like to add another iem to your order, yes or no: ')
                if option=='no':
                    for user_order in user_orders:
                        print('\n' + user_order)
                    print('\nTotal cost of order:                                                 '+ "{:10.2f}".format(final_price))

如何让程序使用正确的小计打印出收据格式？

1 个答案: