[英]Multiple parameters definition of a function Python
我正在尝试编写一个计算贷款成本的函数,但我一直使贷款成本成为用户输入的贷款金额的负值。
#define monthly payment
def MonthlyPayment (ammountOfLoan, numberOfPeriods,yearlyInterestRate):
ammountOfLoan = 0
numberOfPeriods = 0
yearlyInterestRate = 0
payment = [(yearlyInterestRate/12)/(1-(1+yearlyInterestRate/12))**(-numberOfPeriods)] * ammountOfLoan
return (payment)
#define cost of loan
def LoanCost(principal, month, payment):
period = 0
month = 0
payment = 0
cost = period * payment - principal
return (cost)
#calculate cost of loan
def main():
loan = float(raw_input("What is the ammount of your loan? "))
period = float(raw_input("How many months will you make payments? "))
rate = float(raw_input("What is the interest rate? "))
rate = rate / 100
MonthlyPayment(loan, period, rate)
costOfLoan = LoanCost(loan, period, rate)
print "The cost of the loan is $" + str(costOfLoan)
#run main
main()
LoanCost会将期间和付款设置为0(您在MonthlyPayment中也犯了同样的错误),然后将它们相乘。 因此,您最终得到(0 * 0)-主体。 当您真正表示的是“期间”时,您也将第二个参数称为“月”。
澄清一下,当您有一个函数定义
def func(a, b, c):
您不应在函数体内将a,b和c初始化为零。 这样做会覆盖它们的值。 只需直接使用它们即可。
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