python计算所得税程序_Python中的所得税程序

我一直在试图解决一个编码实验室的练习，但我不断在我的程序错误。请帮忙看一下这个代码，告诉我它出了什么问题。

问题：Country X calculates tax for its citizens using a graduated scale rate as shown below:

Yearly Income: 0 - 1000

Tax Rate: 0%

Yearly Income: 1,001 - 10,000

Tax Rate: 10%

Yearly Income: 10,001 - 20,200

Tax Rate: 15%

Yearly Income: 20,201 - 30,750

Tax Rate: 20%

Yearly Income: 30,751 - 50,000

Tax Rate: 25%

Yearly Income: Over 50,000

Tax Rate: 30%

Write a Python function named calculate_tax that will take as an

argument, a dictionary containing key-value pairs of people's names as

the keys and their yearly incomes as the values.

The function should return a dictionary containing key-value pairs of

the same people’s names as keys and their yearly tax bill as the

values. For example, given the sample input below:{

‘Alex’: 500,

‘James’: 20500,

‘Kinuthia’: 70000

} The output would be as follows:

{

‘Alex’: 0,

‘James’: 2490,

‘Kinuthia’: 15352.5

}

The tax for James would be calculated as follows:

The first 1000 (1000 - 0)

Calculation: 1,000 * 0%

Tax: 0

The next 9000 (10,000 - 1,000)

Calculation: 9,000 * 10%

Tax: 900

The next 10,200 (20,200 -10,000)

Calculation: 10,200 * 15%

Tax: 1530

The remaining 300 (20,500 - 20,200)

Calculation: 300 * 20%

Tax: 60

Total Income: 20,500

Total Tax: 0 + 900 + 1530 + 60 = 2490

我的代码income_input = {}

for key in income_input.keys():

income_input[key] = income

def calculate_tax(income_input):

if (income >= 0) and (income <= 1000):

tax = (0*income)

elif (income > 1000) and (income <= 10000):

tax = (0.1 * (income-1000))

elif (income > 10000) and (income <= 20200):

tax = ((0.1*(10000-1000)) + (0.15*(income-10000)))

elif (income > 20200) and (income <= 30750):

tax = ((0.1*(10000-1000)) + (0.15*(20200-10000)) + (0.2*(income-20200)))

elif (income > 30750) and (income <= 50000):

tax = ((0.1*(10000-1000)) + (0.15*(20200-10000)) + (0.2*(30750-20200)) + (0.25*(income-30750)))

elif (income > 50000):

tax = ((0.1*(10000-1000)) + (0.15*(20200-10000)) + (0.2*(30750-20200)) + (0.25*(50000-30750)) + (0.3*(income-50000)))

else:

pass

for key in income_input.keys():

income_input[key] = tax

return tax

测试from unittest import TestCase

class CalculateTaxTests(TestCase):

def test_it_calculates_tax_for_one_person(self):

result = calculate_tax({"James": 20500})

self.assertEqual(result, {"James": 2490.0}, msg="Should return {'James': 2490.0} for the input {'James': 20500}")

def test_it_calculates_tax_for_several_people(self):

income_input = {"James": 20500, "Mary": 500, "Evan": 70000}

result = calculate_tax(income_input)

self.assertEqual({"James": 2490.0, "Mary": 0, "Evan": 15352.5}, result,

msg="Should return {} for the input {}".format(

{"James": 2490.0, "Mary": 0, "Evan": 15352.5},

{"James": 20500, "Mary": 500, "Evan": 70000}

)

)

def test_it_does_not_accept_integers(self):

with self.assertRaises(ValueError) as context:

calculate_tax(1)

self.assertEqual(

"The provided input is not a dictionary.",

context.exception.message, "Invalid input of type int not allowed"

)

def test_calculated_tax_is_a_float(self):

result = calculate_tax({"Jane": 20500})

self.assertIsInstance(

calculate_tax({"Jane": 20500}), dict, msg="Should return a result of data type dict")

self.assertIsInstance(result["Jane"], float, msg="Tax returned should be an float.")

def test_it_returns_zero_tax_for_income_less_than_1000(self):

result = calculate_tax({"Jake": 100})

self.assertEqual(result, {"Jake": 0}, msg="Should return zero tax for incomes less than 1000")

def test_it_throws_an_error_if_any_of_the_inputs_is_non_numeric(self):

with self.assertRaises(ValueError, msg='Allow only numeric input'):

calculate_tax({"James": 2490.0, "Kiura": '200', "Kinuthia": 15352.5})

def test_it_return_an_empty_dict_for_an_empty_dict_input(self):

result = calculate_tax({})

self.assertEqual(result, {}, msg='Should return an empty dict if the input was an empty dict')

运行代码后输出THERE IS AN ERROR/BUG IN YOUR CODE

Results:

Internal Error: runTests aborted: TestOutcomeEvent(handled=False, test=, result=, outcome='error', exc_info=(, NameError("global name 'income' is not defined",), ), reason=None, expected=False, shortLabel=None, longLabel=None) is not JSON serializable

更新了代码income_input = {}

def calculate_tax(income_input):

for key in income_input.items():

tax = 0

if (income_input[key]>= 0) and (income_input[key]<= 1000):

tax = (0*income_input[key])

elif (income_input[key]> 1000) and (income_input[key]<= 10000):

tax = (0.1 * (income_input[key]-1000))

elif (income_input[key]> 10000) and (income_input[key]<= 20200):

tax = ((0.1*(10000-1000)) + (0.15*(income_input[key]-10000)))

elif (income_input[key]> 20200) and (income_input[key]<= 30750):

tax = ((0.1*(10000-1000)) + (0.15*(20200-10000)) + (0.2*(income_input[key]-20200)))

elif (income_input[key]> 30750) and (income_input[key]<= 50000):

tax = ((0.1*(10000-1000)) + (0.15*(20200-10000)) + (0.2*(30750-20200)) + (0.25*(income_input[key]-30750)))

elif (income_input[key]> 50000):

tax = ((0.1*(10000-1000)) + (0.15*(20200-10000)) + (0.2*(30750-20200)) + (0.25*(50000-30750)) + (0.3*(income_input[key]-50000)))

else:

pass

income_input[key] = tax

return income_input

新错误消息THERE IS AN ERROR/BUG IN YOUR CODE

Results:

Internal Error: runTests aborted: TestOutcomeEvent(handled=False, test=, result=, outcome='error', exc_info=(, KeyError(('Jane', 20500),), ), reason=None, expected=False, shortLabel=None, longLabel=None) is not JSON serializable

不知道如何消除KeyError错误。

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