python *: 'int' 和 'function 不支持的操作數類型

Question

我的 python 遇到問題，因為它一直向我返回此錯誤代碼

 total_amount = loanpayment * years * 12
TypeError: unsupported operand type(s) for *: 'function' and 'int'

def loanpayment(principal, percentage, years):
    i = (percentage/100)/12
    n = years * 12
    P = principal
    loanpayment = (i*principal*((1+i)**n))/(((1+i)**n)-1)
    return loanpayment

principal = int(input(""))
percentage = float(input(""))
years = int(input(""))
num_payments = years * 12

total_amount = loanpayment * years * 12

print("Monthly payment : {}".format(loanpayment(principal,percentage,years)))
print("Total interest paid", interest, ".")

Answer 1

貸款支付是loanpayment 。

你需要用參數調用它。

在你的情況下：

loanpayment(principal, percentage, years)

整行：

total_amount =  loanpayment(principal, percentage, years) * years * 12