python中的贷款还款计算

这是我到目前为止所做的，但我只是对如何添加以下requirements Call函数感到困惑，该函数使用适当的参数计算付款，并输出贷款金额、

年利率、付款数量、付款、已偿还金额和已偿还利息的值

def myMonthlyPayment(Principal, annual_r, years):
    n = years * 12  # number of monthly payments
    r = (annual_r / 100) / 12  # decimal monthly interest rate from APR
    MonthlyPayment = (r * Principal * ((1+r) ** n)) / (((1+r) ** n) - 1)
    return MonthlyPayment

years = int(input('Please enter number of years of loan: '))
annual_r = float(input('Please enter the annual interest rate: '))
Principal = int(input('Please enter the amount of loan: '))

print('Monthly payment: {}'.format(myMonthlyPayment(Principal, annual_r, 
years)))

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一个建议是：变量名和参数名使用小写是惯例；使用大写字母 （Principal和MyMonthlyPayment）意味着它是一个类，可以 可能会误导阅读代码的人

它还会导致语法着色提供不正确的信息

至于你的问题，你已经让用户提供了年利率，所以你可以打印出来

对于其他值，您可以向用户索要，也可以使用 和你到目前为止采取的方法一样

一个可能有用的提示是，您可以将多个参数传递给format（），如下所示：

print('Monthly payment: {}, loan amount: {}, annual rate: {}'.format(monthlyPayment, 
loan, annual_r))

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我没有验证数学，但是你的代码运行了，方法很好！我收到以下错误：

name错误：未定义名称“m”

#Cristian Benitez
principal = float(input("total loan amount taken: "))
interest_rate = float(input("annual interest rate applied: "))
duration = int(input("loan duration in years: "))

def monthly_loan(principal,interest_rate,duration):
n = duration*12            #total number of months
r = interest_rate/(100*12) #interest per month
monthly_payment = principal*((r*((r+1)**n))/(((r+1)**n)-1)) #formula for 
compound interest applied on mothly payments.
return monthly_payment

                     #remaining loan balance calculation
def remaining_bal(principal,annual_interest_rate,duration,payments):
r = annual_interest_rate/1200 # monthly interest rate
m = r + 1
n = duration*12      #duration in months

                     # remaining balance using compound interest formula
remaining = principal*(((m**n)-(m**payments))/((m**n)-1))
return remaining

monthly = monthly_loan(principal,interest_rate,duration)

print("Loan amount: ",principal," Interest rate: ",interest_rate)
print("Duration (Years): ",duration," Monthly payment: ",int(monthly))