在 Python 中的 while 循环中附加列表会出现错误消息“列表索引超出范围”

Question

所以我试图做一个简单的循环，由于某种原因，我似乎无法理解为什么会出现错误消息。earnings = [94500,65377,84524]deductions = [20000,18000,19000]tax = [] #empty listi = -1    #iterative counterwhile True:    i=i+1    if (earnings[i] > 23000):        tax.append(0.14*earnings[i])        continue    else:        breakprint ('Tax calculation has been completed')print ('Number of iterations: ',i)我觉得它与这条线有关， if (earnings[i] > 23000) 但我不知道我将如何操纵它。

Answer 1

您可以使用enumerate来迭代earnings列表，同时生成从以下位置开始的迭代计数器1：

tax = []

for i, earning in enumerate(earnings, 1):

    if earning <= 23000:

        break

    tax.append(0.14 * earning)

print('Tax calculation has been completed')

print('Number of iterations: ', i)

Answer 2

您的循环中没有检查索引是否超出范围，即检查 i 与列表“收益”中的项目数。试试这个方法：

earnings = [94500,65377,84524]

deductions = [20000,18000,19000]

tax = [] #empty list

i = -1    #iterative counter

while True:

    i=i+1

    if i >= len(earnings):

        break

    if (earnings[i] > 23000):

        tax.append(0.14*earnings[i])

        continue

print ('Tax calculation has been completed')

print ('Number of iterations: ',i)