我如何在python的for循環中更新兩個變量以獲得復利方程

Question

我編寫了一個函數，可以計算給定初始投資金額、利率以及復利多年的復利（年度）的未來值。 我將它打印到表格上，但起始值沒有正確每年更新，年付款也沒有正確更新。 我不知道如何讓它們在 for 循環中正確更新。

這是代碼：

print("Welcome to the Annual Investment Report Calculator! \n\nPlease enter the values below.\n")
initialAmt = float(input("- Enter your investment amount: "))
interest = float(input("- Enter the interest rate: "))
termPeriod = int(input("- Enter the time period, in years, for your investment: "))


#Function to calculate and print the values
def calculateValue(initialAmt, interest, termPeriod):
    for termPeriod in range(termPeriod):
        total = initialAmt * (((1 + ((interest/100.0))) ** (termPeriod+1)))
        total = float(round(total, 2))
        annualIncome = total - initialAmt
        annualIncome = float(round(annualIncome, 2))
        print('{:<15} {:<25} {:<25} {:<20}'.format((termPeriod+1), initialAmt, annualIncome, total))
    return total


def main():
    print("\n")
    title = "Annual Fixed Investment Income\n"
    yearT = "Year"
    strtBalT = "Starting Balance"
    annIncT = "Annual Income"
    endBalT = "Ending Balance"


#Formats title and headings
    print('{:^85}'.format(title))                                               
    print('{:<15} {:<25} {:<25} {:<20}'.format(yearT, strtBalT, annIncT, endBalT)) 
    calculateValue(initialAmt, interest, termPeriod)                                                    


main()

Answer 1

print("Welcome to the Annual Investment Report Calculator! \n\nPlease enter the values below.\n")
initialAmt = float(input("- Enter your investment amount: "))
interest = float(input("- Enter the interest rate: "))
termPeriod = int(input("- Enter the time period, in years, for your investment: "))


#Function to calculate and print the values
def calculateValue(initialAmt, interest, termPeriod):
    for termPeriod in range(termPeriod):
        total = 100 * (((1 + ((interest/100.0))) ** (termPeriod+1)))
        total = float(round(total, 2))
        annualIncome = total - initialAmt
        annualIncome = float(round(annualIncome, 2))
        print('{:<15} {:<25} {:<25} {:<20}'.format((termPeriod+1), initialAmt, annualIncome, total))
        initialAmt = total
    return total


def main():
    print("\n")
    title = "Annual Fixed Investment Income\n"
    yearT = "Year"
    strtBalT = "Starting Balance"
    annIncT = "Annual Income"
    endBalT = "Ending Balance"


#Formats title and headings
    print('{:^85}'.format(title))                                               
    print('{:<15} {:<25} {:<25} {:<20}'.format(yearT, strtBalT, annIncT, endBalT)) 
    calculateValue(initialAmt, interest, termPeriod)                                                    


main()

以下是問題的答案 for 循環只需要編輯和重新排序，但這有效並提供正確的值。 我敢肯定，如果有人想要公正地對待它，它可以變得更簡單、更不丑陋。

Answer 2

print("Welcome to the Annual Investment Report Calculator! \n\nPlease enter the values below.\n")
initialAmt = float(input("- Enter your investment amount: "))
interest = float(input("- Enter the interest rate: "))
termPeriod = int(input("- Enter the time period, in years, for your investment: "))


#Function to calculate and print the values
def calculateValue(initialAmt, interest, termPeriod):
    for termPeriod in range(termPeriod):
        total = initialAmt * ((1 + ((interest/100.0))))
        total = float(round(total, 2))
        annualIncome = total - initialAmt
        annualIncome = float(round(annualIncome, 2))
        print('{:<15} {:<25} {:<25} {:<20}'.format((termPeriod+1), initialAmt, annualIncome, total))
        initialAmt = total
    return total


def main():
    print("\n")
    title = "Annual Fixed Investment Income\n"
    yearT = "Year"
    strtBalT = "Starting Balance"
    annIncT = "Annual Income"
    endBalT = "Ending Balance"


#Formats title and headings
    print('{:^85}'.format(title))                                               
    print('{:<15} {:<25} {:<25} {:<20}'.format(yearT, strtBalT, annIncT, endBalT)) 
    calculateValue(initialAmt, interest, termPeriod)                                                    


main()

這是適用於所有輸入的答案