[英]Defining lists and calling functions in Python
我正在使用Python3。这是一个班级的家庭作业项目,但我没有寻找任何可以解决我问题的方法! 我只是想知道是否有人可以帮助指出我哪里出了问题,或者我需要研究什么才能使我的代码正常工作。
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名称,但是一旦按下Enter键,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,但是任何帮助都将不胜感激!
您不能只是为列表添加一个不存在的索引以向其中添加项目:
>>> a = []
>>> a[0] = 1
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
IndexError: list assignment index out of range
相反,您应该查看对列表使用.append()
方法。
(之所以看不到IndexError
调试详细信息,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,因为它们掩盖了此类意外错误,并且更难于指出出了什么问题-他们抓住了任何异常,不仅是由于用户输入错误而引起的异常。)
有一个IndexError: list assignment index out of range
该行的IndexError: list assignment index out of range
taxPayersList[index] = input('Enter a tax payer name: ')
您没有看到它是因为您排除了所有错误并且没有打印出来。 我建议使用
name = input('Enter a tax payer name:')
taxPayersList.append(name)
等等。请注意,我将其附加到列表中。 我还建议使用其他错误处理策略。
另外,您可能希望使用词典而不是两个列表,因为您希望将收入与姓名相关联,
name = input('Enter a tax payer name:')
income = float(input('Enter income amount:'))
incomes[name] = income
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