Question

感谢您查看此信息。所以我遇到了一些问题。

我似乎无法将所需的输出转换为另一个文件。我试图在某种意义上模拟收据，以显示项目，数量，项目成本等的描述。它似乎没有正常工作，通常在那里放一个负面。我知道这与输入负数有关，但我对此感到困惑。
我似乎无法正确格式化。我想将所有内容都舍入到两个小数位，我知道它是{：.2f}但是，因为我试图在列中排列这些，所以我似乎无法弄清楚这一点。

我的代码：

def cashRegister():
    subTotal = 0
    total = 0
    salesTax = .085
    registerTableHeader = "{0:<15}{1:>35}{2:>10} {3:>10}{4:>10}\n"\
                           .format('Description', 'Qty', 'Unit Cost',\
                             'Item Cost', 'Subtotal')
    cashRegisterFile.write(str(registerTableHeader))


    quantityOfItem = int(input("Enter quantity of item: "))
    while(quantityOfItem > 0):
        itemDescription = str(input("Enter Item's description: ")[:30])
        itemCost = float(input("Enter item's cost: "))        
        subTotal = quantityOfItem * itemCost 
        total += subTotal
        quantityOfItem = int(input("Enter quantity of item: "))

    registerTable = "{0:<15}{1:>35}{2:>10} {3:>10} {4:>10}\n\n"\
            .format(itemDescription, quantityOfItem, itemCost, itemCost * \
                quantityOfItem, subTotal)      
    cashRegisterFile.write(str(registerTable))

期望的输出：

Description                     Qty Unit Cost Item Cost  Subtotal
First Item's Description          1     24.99     24.99     24.99
This is the second item's desc    5      2.00     10.00     34.99
This is the third item's descr   10     11.00    110.00    144.99

Sales Tax                                                   13.05
Total                                                      158.04

感谢您查看我的帖子！

Answer 1

您需要缩进对项目的书写，以便对SharedPreferences preferences = getPreferences(Context.MODE_PRIVATE); SharedPreferences.Editor editor = preferences.edit(); String activityTag = editor.getString(getString(R.string.last_viewed_activity_tag), null); // If the user is not launching the app for the first time, launch the last opened Activity; otherwise, launch the default initial Activity. Class initialActivityClass; switch (activityTag) { case "CoolActivity": initialActivityClass = CoolActivity.class; break; case "WowActivity": initialActivityClass = WowActivity.class; break; default: initialActivityClass = MainActivity.class; break; } Intent intent = new Intent(this, initialActivityClass); startActivity(intent); finish();循环中的每个项目执行。你只在循环后写了这个项目。因此，条件while中的负数已写入文件。

我将循环的顶部更改为：

while(quantityOfItem > 0):

将您的数字格式化为while True: quantityOfItem = int(input("Enter quantity of item: ")) if quantityOfItem <= 0: break两位小数：

{4:>10.2f}

def cashRegister(cashRegisterFile): subTotal = 0 total = 0 salesTax = .085 registerTableHeader = ("{0:<30} {1:>10}{2:>10} {3:>10} {4:>10}\n".format( 'Description', 'Qty', 'Unit Cost','Item Cost', 'Subtotal')) cashRegisterFile.write(registerTableHeader) while True: quantityOfItem = int(input("Enter quantity of item: ")) if quantityOfItem <= 0: break itemDescription = input("Enter Item's description: ")[:30] itemCost = float(input("Enter item's cost: ")) subTotal = quantityOfItem * itemCost total += subTotal registerTable = ("{0:<30} {1:>10}{2:>10.2f} {3:>10.2f} {4:>10.2f}\n".format( itemDescription, quantityOfItem, itemCost, itemCost * quantityOfItem, subTotal)) cashRegisterFile.write(registerTable) with open('cash.txt', 'w') as cashRegisterFile: cashRegister(cashRegisterFile)的内容：

cash.txt

while循环到另一个文件

1 个答案: