python 贷款计算器在运行时出现计算错误

Question

我正在尝试构建一个贷款计算器，该计算器计算每月的欠款和利率以及开始时的首付和每月分期付款，以便它可以输出您需要多少个月还清你的债务。当我输入低于 10% 的 interest_rate 时，该程序工作正常，但如果我输入任何数字，例如 18%，它就会冻结并且没有输出。当我停止运行程序时，它给我这些错误：

Traceback (most recent call last):
  File "C:\Users\Khaled\PycharmProjects\interest_payment\main.py", line 35, in <module>
    months_to_finish = get_months(price)  # this returns the number of months from the counter var
  File "C:\Users\Khaled\PycharmProjects\interest_payment\main.py", line 6, in get_months
    price = price - installments
KeyboardInterrupt

这是我的代码：

def get_months(price):
    counter = 0
    price = price - down_payment
    while price > 0:
        price = price + price * interest_rate
        price = price - installments
        counter += 1
    return counter


if __name__ == '__main__':
    price = float(input("Enter price here: "))
    interest_rate = float(input("Enter interest rate here: %")) / 100
    while interest_rate < 0:
        interest_rate = float(input('Invalid interest rate please try again: %')) / 100
    down_payment = int(input("Enter your down payment here: $"))
    while down_payment > price or down_payment < 0:
        down_payment = int(input('Invalid down payment please try again: $'))

    choice = input("Decision based on Installments (i) or Months to finish (m), please write i or m: ").lower()
    if choice == 'm':
        print('m')


    elif choice == 'i':
        installments = int(input("What's your monthly installment budget: "))  # get the installments
        months_to_finish = get_months(price)  # this returns the number of months from the counter var
        print(f"It will take {months_to_finish} months to finish your purchase.")
    else:
        print('Invalid choice program ended')

这些是测试值：
在此输入价格：22500
在此输入利率：%18
在这里输入您的预付款：$0
根据分期付款 (i) 或完成月数 (m) 决定，请写 i 或 m: i
您每月的分期付款预算是多少：3000

Answer 1

初始本金 22,500 美元，利率 18%，首付 0 美元，每月还款 3,000 美元，需要无数个月才能还清贷款。在利率为 18% 的一个时期后，您已经累积了 4,050 美元的利息。由于您每期只需支付 3,000 美元，您甚至没有支付新的利息金额，而且您欠下的总金额将永远增长。您可能想在某个地方检查每月付款是否大于第一个月的利息。您可以这样修改您的代码：

if installments < (price - down_payment) * interest_rate:
    print("The purchase cannot be made with these amounts.")
else:
    months_to_finish = get_months(price)
    print(f"It will take {months_to_finish} months to finish your purchase.")

Answer 2

l=[]
n=int(input())
i=0
for i in range(n):
    l.append(str(input()))
def long(x):
    if x>10:
        return print(l[i][0]+str(len(l[i])-2)+l[i][-1])
def short(x):
    if x<=10:
        return print(l[i])
i=0
for i in range(len(l[i])):
    long(len(l[i]))
    short(len(l[i]))
    continue

python 贷款计算器在运行时出现计算错误

Calculation error at runtime in python loan calculator

python

calculator