Question

下面的代码虽然有些混乱，但要求用户输入他们的年份：退休年限，利率，初始金额和每年增加的金额。那部分工作正常。我现在要做的是根据用户的输入每五年计算一次。基本上我希望它看起来像这样：

The value of your account after 5 years will be $...
The value of your account after 10 years will be $...
The value of your account after 15 years will be $...
etc... all the way up until the number of years_left is met

我现在的代码主要是做的，除了我认为我有一个数学错误或编码错误（或两者），我似乎无法弄清楚。任何帮助将不胜感激。我的代码如下：

def main():

    # Number of years left until retirement
    while True:
        try:
            years_left = int(input("Please enter the number of years left until retirement (1-70): "))
        except ValueError:
            print ("Entered value is not a number! Please enter a number 1-70.")
        except KeyboardInterrupt:
            print("Command Error! Please enter a number 1-70.")
        else:
            if 1 <= years_left < 70:
                break
            else:
                print("Entered value is not in the range 1-70.")

    # Interest rate (confirmation needed if greater than 10)
    while True:
        try:
            interest_rate = int(input("Please enter an interest rate: "))
            if interest_rate > 10:
                confirm = input("Entered interest rate is greater than 10%. Are you sure? (y/n): ")
                if confirm =="y":
                    break
            elif 0 <= interest_rate < 10:
                break
        except ValueError:
            print("Entered value is not a number! ") 

    # Initial amount to the IRA
    while True:
        try:
            initial_amount = int(input("Please enter the initial amount to the IRA: "))
        except ValueError:
            print ("Entered value is not a number! Please enter a number.")
        except KeyboardInterrupt:
            print("Command Error! Please enter a number.")
        else:
            if 0 < initial_amount:
                break
            else:
                print("Entered value is a negative number. Please enter a positive number.")

    # Amount added to the IRA each year
    while True:
        try:
            amount_added = int(input("Please enter the amount added to the IRA each year: "))
        except ValueError:
            print ("Entered value is not a number! Please enter a number.")
        except KeyboardInterrupt:
            print("Command Error! Please enter a number.")
        else:
            if 0 <= amount_added <= 2500:
                break
            else:
                print("Entered amount is not in the range $0 - $2,500.")

    #value = initial_amount + (initial_amount)*interest_rate + amount_added

    value = 0
    for x in range(5, years_left + 5):
        value = initial_amount + (initial_amount) * interest_rate + amount_added
        print("The value of your account after " + str(x) + " years will be $" + str(value))

main()

我当前的程序输出如下：

Please enter the number of years left until retirement (1-70): 10
Please enter an interest rate: 7
Please enter the initial amount to the IRA: 1
Please enter the amount added to the IRA each year: 2000
The value of your account after 5 years will be $2008
The value of your account after 6 years will be $2008
The value of your account after 7 years will be $2008
The value of your account after 8 years will be $2008
The value of your account after 9 years will be $2008
The value of your account after 10 years will be $2008
The value of your account after 11 years will be $2008
The value of your account after 12 years will be $2008
The value of your account after 13 years will be $2008
The value of your account after 14 years will be $2008

Answer 1

将其更改为：

value = 0
for x in range(5, years_left+5):
    value = initial_amount + (initial_amount) * interest_rate + amount_added
    print("The value of your account after " + str(x) + " years will be $" + str(value))

这样：

count=5
value = 0
for x in range(5, years_left):
    value = value + initial_amount + (initial_amount) * interest_rate + amount_added
    print("The value of your account after " + str(count) + " years will be $" + str(value))
    count += 5
    if count > year_left+5:
       break

在你的情况下你取范围（5，year_left + 5），它会产生一个从5到year_left + 5的数字，所以它将像[5,6,7,8,9.....year_left+5]，它不会增加5。

更多pythonic将是：

for x in range(5, years_left + 5,5):
    value = value + initial_amount + (initial_amount) * interest_rate + amount_added
    print("The value of your account after " + str(x) + " years will be $" + str(value))

它会增加5个

使用Python从用户输入计算IRA /退役

1 个答案: