Python税务计算器算法工作不正常

Question

我对python非常陌生，所以如果这个问题很简单，我很抱歉。我正在尝试编写一个算法，根据用户输入的工资计算2017年和2018年的工资差异。我已经到了这样一个地步，算法确实计算了一个税率，但是它似乎是逆向的，也就是说，投入的收入越低，欠的税就越高，这是政府尽管有缺陷，但通常不会做的事情。我尝试了不同的算法，但我仍然不知道我哪里出错了。如有任何意见或建议，我们将不胜感激。 谢谢！你知道吗

# of tax brackets
levels = 6
#2017 tax rates
rates2017 = [0, 10, 15, 25, 28, 33, 35]
#2018 tax rates
rates2018 = []
#2017 income tax thresholds
incomes2017 = [0, 9325, 37950, 91900, 191650, 416700, 418400]

# take in a value for net income and assign it to int
netincome = int(input('Please input an integer for income: '))

#initialize the variables used
tax_owed = 0
taxable_income = 0
netincomeleft = netincome - 6500
i = levels

#while loop calculates the income tax
while i >= 0:
    taxable_income = netincomeleft - incomes2017[i]
    tax_owed += taxable_income * (rates2017[i]/100)
    netincomeleft = incomes2017[i]
    i -= 1

#multiply tax owed by -1 to get a positive int for clarity
taxes_owed = tax_owed * -1

# print out the 2017 tax owed
print('tax owed on $', netincome, 'after standard deduction is ', taxes_owed)

*为了清晰起见，我在Jupyter笔记本环境中使用python3

Answer 1

def USA():
    tax=0
    if salary<=9700:
        tax=9700*0.1
    elif salary<=39475:
        tax=970+(salary-9700)*0.12
    elif salary<=84200:
        tax=4543+(salary-39475)*0.22 
    elif salary<=160725:
        tax=14382.5+(salary-84200)*0.24
    elif salary<=204100:
        tax=32748.5+(salary-160725)*0.32  
    elif salary<=510300:
        tax=139918.5+(salary-204100)*0.35
    else:
        tax=328729.87+(salary-510300)*0.37
    return ('tax owed on $', salary, 'after standard deduction is ', tax, 'and your netincome is ', (salary-tax) )          
salary=int(input('Please input an integer for income: '))      
print(USA())