Question

我正在使用Python 3.这是针对课程的家庭作业项目，但我并不是想找点事情来帮我解决问题！我只是想知道是否有人可以帮助指出我出错的地方，或者我需要考虑使我的代码工作。

def main():

    taxPayersList = []
    incomesList = []
    taxesList = []

    taxPayersList, incomesList = inputNamesAndIncomes(taxPayersList, incomesList)

    taxesList = calculateTaxes(incomesList)
    displayTaxReport(taxesList, incomesList, taxPayersList)


def inputNamesAndIncomes(taxPayersList, incomesList):
    print('Welcome to Xanadu Tax Computation Program')
    print('')
    confirmation = input('Do you have income amounts? y/n ')
    index = 0

    try:

        while confirmation == 'y' or confirmation == 'Y':
            taxPayersList[index] = input('Enter a tax payer name: ')
            incomesList[index] = float(input('Enter income amount: '))

            confirmation = input('Are there more income amounts? ')
            index += 1
    except:
        print('An error occurred. Please only enter numbers for income amount.')

    return taxPayersList, incomesList

def calculateTaxes(incomesList):

    index = len(incomesList)

    while index < len(incomesList):
        if incomesList[index] >= 0 and incomesList[index] <= 50000:
            taxesList[index] = incomesList[index] * .05

        elif incomesList[index] >= 50000 and incomesList[index] <= 100000:
            taxesList[index] = 2500 + ((incomesList[index] - 50000) * .07)

        elif incomesList[index] >= 100000:
            taxesList[index] = 6000 + ((incomesList[index] - 100000) * .09)

        index += 1

    return incomesList    


def displayTaxReport(taxesList, incomesList, taxPayersList):
    print('2018 TAX DUES FOR XANADU STATE')
    print('')
    print('Name\t\tANNUAL INCOME\tTAXDUE')
    for n in incomesList:
        print(taxPayersList,'\t\t',incomesList,'\t',taxesList)


main()

现在，我可以在第一个输入中输入一个名字，但是一旦我点击输入它就会打印出我的错误代码，然后打印出如下所示的最终功能。

Welcome to Xanadu Tax Computation Program

Do you have income amounts? y/n y
Enter a taxpayer name: Susan
An error occurred. Please only enter numbers for income amount.
2018 TAX DUES FOR XANADU STATE

Name        ANNUAL INCOME   TAXDUE

我知道这是一团糟，但任何帮助都会非常感激！

Answer 1

您不能只为列表添加一个不存在的索引来向其中添加项目：

>>> a = []
>>> a[0] = 1
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
IndexError: list assignment index out of range

相反，您应该考虑使用.append()方法列表。

（您没有看到IndexError调试详细信息的原因是因为您的except子句阻止了它的显示。裸except子句通常被认为是反模式，因为它们掩盖了意外像这样的错误并且更难分辨出错误 - 它们会捕获任何异常，而不仅仅是由于用户输入错误导致的异常。）

Answer 2

行

有一个IndexError: list assignment index out of range

taxPayersList[index] = input('Enter a tax payer name: ')

您没有看到它，因为您排除了所有错误并且没有打印它们。我建议使用

name = input('Enter a tax payer name:')
taxPayersList.append(name)

等。请注意，我将其附加到列表中。我还建议采用不同的处理错误的策略。

或者，您可能希望使用字典而不是使用两个列表，因为您希望将收入与名称相关联，

name = input('Enter a tax payer name:')
income = float(input('Enter income amount:'))
incomes[name] = income

在Python中定义列表和调用函数

2 个答案: