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问题描述：

分级税率定义如下，希望定义一个税务计算器，分层计算应缴纳的税费。

brackets = [ (0, 0.10), (10000, 0.20), (30000, 0.30) ]

def calculate_tax(income, brackets): # Your code here tax = 0 for k in brackets[::-1]: threshold = k[0] tax_r = k[1] if income > threshold: tax += (income - threshold)*tax_r income = income - (income - threshold) return tax

# Method 2: def calculate_tax(income, brackets): # Your code here tax = 0 brackets.reverse() for k in brackets: threshold = k[0] tax_r = k[1] if income > threshold: tax += (income - threshold)*tax_r income = income - (income - threshold) return tax

# Test case calculate_tax(50000, brackets)

Output:
11000.0

Notes：

• lst.reverse()会直接修改原列表。
• reverse()返回的是None，而不是反转后的列表！
  不能写成：lst = lst.reverse()（Error！此时lst会变成None）。
• 使用切片[::-1]可以生成一个新列表：

  lst = [1, 2, 3, 4, 5] lst_reverse = lst[::-1] print(lst_reverse)

• 本税务计算器采用累进税率制。它不是将总收入直接乘以最高税率，而是针对不同收入区间分别计算税额。

完整可运行代码：

brackets = [ (0, 0.10), (10000, 0.20), (30000, 0.30) ] def calculate_tax(income, brackets): # Your code here tax = 0 for k in brackets[::-1]: threshold = k[0] tax_r = k[1] if income > threshold: tax += (income - threshold)*tax_r income = income - (income - threshold) return tax # Test case print(calculate_tax(50000, brackets))