尝试写入 Python 闭包的语法无效

Question

我正在尝试编写一个函数（在 Python 2.7 中），该函数需要未清余额和年利率，然后 return 使用二分法搜索将每月最低付款额精确到最接近的美分 to solve problem #3。我试图通过在主函数中编写一个函数来遵循 DRY 原则，该函数应该 return 一个列表，其中包含一年后的余额和月数（如果余额达到零或更少，循环应该中断），这将需要在我的主要功能中计算两次。当我在继续之前尝试测试这个初始闭包时，我在分配 monthlyPayment 的行上遇到语法错误。我做错了什么？

# Problem Set 1("C")
# Time Spent: xx hours

def payInOne_BisectionSearch (balance,annualRate):
    #initialize variables
    initialBalance = balance
    monthlyRate = annualRate/12
    minMonthly = balance/12
    maxMonthly = (balance * (1 + monthlyRate ** 12 )/12
    monthlyPayment = (minMonthly + maxMonthly)/2
    numMonths = 1
    #define function to check balance after 12 months       
    def balanceAfterYear (balance, monthlyRate, monthlyPayment):
        for numMonths in range (1,13):
            interest = balance * monthlyRate
            balance += interest - monthlyPayment
            if balance <= 0:
                break
        return [balance, numMonths]
    resultList = balanceAfterYear(initialBalance, monthlyRate, monthlyPayment)
    print resultList[0],resultList[1]


payInOne_BisectionSearch (input("Enter the outstanding balance"),input("Enter annual rate as a decimal"))

Answer 1

您忘记了上一行的右括号。

maxMonthly = (balance * (1 + monthlyRate ** 12 )/12

尝试写入 Python 闭包的语法无效

Invalid Syntax attempting to write Python closure

closures

syntax-error

python-2.7