当输入 < 0 并且最低税率相同时，如何使代码停止，然后打印出以下国家/地区

Question

当输入 <0 且最低税相同时，如何使代码停止。 我有 4 个国家，例如，如果丹麦和挪威有相同的税收，它将打印出：按字母顺序排列的“丹麦挪威”。 这是一个例子： 收入：1000000 最低税收：150000.0 美国
收入：6000 最低税：1500.0 丹麦 挪威 美国
收入：-1

这是我的代码，它打印出最低值和国家：

`

continue_input = True
income = 0

while continue_input and income >= 0:
    income = int(input('Income: '))

    # Canada   
    canada_tax = 0.26
    canada = canada_tax * income

    # Norway
    if income > 3000:
        norway_tax1 = 0.1 * 3000
        tax_left = income - 3000
        norway_tax2 = 0.4 * tax_left
        norway_tax = norway_tax1 + norway_tax2
    elif income < 3000:
        norway_tax = 0.1 * income

    # Denmark
    denmark_tax = 0
    percent = 0
    for _ in range(int(income/1000)):
      denmark_tax += percent * 1000
      percent += 0.1
      denmark_tax += percent * (income%1000)
      
    # USA
    if income <= 1500:
        USA_tax = 0.12 * income
    elif income > 1500 and income <= 6000:
        USA_tax = 0.25 * income
    elif income > 6000 and income <= 10000:
        USA_tax = 0.38 * income
    elif income > 10000:
        USA_tax = 0.15 * income



    #Print lowest tax
    if canada < norway_tax and canada < USA_tax and canada < denmark_tax:
        print(f'Lowest tax: {canada}')
        print('Canada')
    elif norway_tax < canada and norway_tax < USA_tax and norway_tax < denmark_tax:
        print(f'Lowest tax: {norway_tax}')
        print('Norway')
    elif USA_tax < canada and USA_tax < norway_tax and USA_tax < denmark_tax:
        print(f'Lowest tax: {USA_tax}')
        print('USA')
    elif denmark_tax < canada and denmark_tax < norway_tax and denmark_tax < USA_tax:
        print(f'Lowest tax: {denmark_tax}')
        print('Denmark')

我期待这个：

收入：100万
最低税：150000.0
美国
收入：6000
最低税：1500.0
丹麦 挪威 美国
收入：-1

Answer 1

因为，你在 while 循环中获取输入，它会首先执行所有计算，然后打印，然后检查收入是否小于 0。

为避免这种情况，您可以从 while 循环中删除income>=0条件并立即检查该值是否为负。 如果超过 1 个国家/地区有最低税，您的代码也不会打印，因为您只检查较少的价值而不是相等的。

解决上述两个问题的简单方法是：-

continue_input = True
income = 0

# changed here
while continue_input :
    income = int(input('Income: '))

    # changed here
    if income < 0 :
        break

    # Canada   
    canada_tax = 0.26
    canada = canada_tax * income

    # Norway
    if income > 3000:
        norway_tax1 = 0.1 * 3000
        tax_left = income - 3000
        norway_tax2 = 0.4 * tax_left
        norway_tax = norway_tax1 + norway_tax2
    elif income < 3000:
        norway_tax = 0.1 * income

    # Denmark
    denmark_tax = 0
    percent = 0
    for _ in range(int(income/1000)):
      denmark_tax += percent * 1000
      percent += 0.1
      denmark_tax += percent * (income%1000)
      
    # USA
    if income <= 1500:
        USA_tax = 0.12 * income
    elif income > 1500 and income <= 6000:
        USA_tax = 0.25 * income
    elif income > 6000 and income <= 10000:
        USA_tax = 0.38 * income
    elif income > 10000:
        USA_tax = 0.15 * income
        

    # changed here
    min_tax = min(canada, norway_tax, USA_tax, denmark_tax)
    print(f'Lowest tax: {min_tax}', end = " ")

    if min_tax == canada :
        print('Canada', end = " ")

    if min_tax == denmark_tax :
        print('Denmark', end = " ")

    if min_tax == norway_tax :
        print('Norway', end = " ")

    if min_tax == USA_tax :
        print('USA',end= " ")
    print()

output:-

 Income: 1000000 Lowest tax: 150000.0 USA Income: 6000 Lowest tax: 1500.0 Denmark Norway USA Income: -1

PS：- 我使用end = " "调整了打印语句，以便您可以获得所需形式的 output。 我在更改代码之前也发表了评论