Question

此代码要求用户输入一个8位GTIN来订购产品。输入产品数量后，我将其写入单独的（空）收据文件。一旦他们完成订购产品，程序就会停止，打开订单收据文件后，您可以看到订购的产品。

订购产品后，我希望我的收据显示累计订单总额（product_price）。为了做到这一点，我需要创建一个运行总计，但我不理解其他教程。

receipt_out = open("Order Receipt.txt","w")
go_again = True
while go_again==True:
    file = open("GTIN_Description.txt","r")

    keep_asking = False
    while keep_asking==False:
        gtin = input("Enter GTIN: ")
        keep_asking = gtin.isdigit()

    found = False
    keep_asking = True
    while keep_asking == True:
        for fileline in file:
            linecontent=fileline.split('\t')
            if gtin == linecontent[0]:
                product_name = linecontent[1]
                gtinprice = float(linecontent[2])
                quantity = int(input("Quantity of item: "))
                price = gtinprice * quantity
                product_price = "£{0:.2f}".format(price)
                print (linecontent[1],"for", product_price)
                output_to_receipt = ("{}\t{}\t{}\t{}\t{}\n").format(gtin, product_name, quantity, gtinprice, product_price)
                print(output_to_receipt)
                receipt_out.write(output_to_receipt)
                found = True

（我想在这里创建一个运行总计，其中所有整体product_price从用户的输入中加在一起以显示在收据上）

        if found == False:
            print ("GTIN not found")

        more = input("Input 'Y' to continue or 'N' to quit window and be supplied with a receipt of your orders: ")
        if more.lower().strip()== "y":
            keep_asking = False
        elif more.lower().strip()=="n":
            receipt_out.write(output_to_receipt)
            receipt_out.close()
            print("Thank you for ordering with Computer Warehouse")

非常感谢〜rn01

Answer 1

这样的东西？

found = False
keep_asking = True
total_price = 0.0  # <--
while keep_asking == True:
    for fileline in file:
        linecontent=fileline.split('\t')
        if gtin == linecontent[0]:
            product_name = linecontent[1]
            gtinprice = float(linecontent[2])
            quantity = int(input("Quantity of item: "))
            price = gtinprice * quantity
            total_price += price                 # <--
            product_price = "£{0:.2f}".format(price)
            print (linecontent[1],"for", product_price)
            output_to_receipt = ("{}\t{}\t{}\t{}\t{}\n").format(gtin, product_name, quantity, gtinprice, product_price)
            print(output_to_receipt, "\t(total: {})".format(total_price))   # <--
            receipt_out.write(output_to_receipt)
            found = True

如何创建一个运行总计 - Python

1 个答案: