Question

我正在创建一个程序，可以将一种货币转换为两种货币。我遇到一个错误，提示ZeroDivisionError: division by zero，但它也提示local variable 'amount_nok' might be referenced before assignment。

我尝试了多种解决方案，例如创建新变量，或尝试删除尚未实际分配的所有引用变量，等等。

def getRate(FromValue, ToValue):
    if FromValue == 'NOK' and ToValue == 'USD':
        rate = 9.0169
    else:
        rate = 0
    return rate


def calculate():
    print('Convert an amount from NOK to EUR/USD')

    validValue = 'N'
    while validValue == 'N':
        validValue = 'Y'
        try:
            amount_nok = int(input("Enter amount you want to convert: "))
        except ValueError:
            validValue = 'N'
            print('Stop this stupidity! Pick a whole number!')

    rate_Nok_Eur = getRate('NOK', 'EUR')
    print('Amount EUR & USD bought for ' ,'%.2f' % (amount_nok) + ' NOK is '+ '%.2f' % (amount_nok / rate_Nok_Eur) + "\N{euro sign}"
          'og ', '%.2f' % (amount_nok/9.0169)+"\N{dollar sign}")

calculate()

我希望程序在程序启动阶段运行计算时不会出现任何错误，因此最终输出看起来像这样

Amount EUR & USD bought for 20 NOK is (dollar amount) and (euro amount)

Answer 1

当您定义rate_Nok_Eur = getRate('NOK', 'EUR')时，您的getRate方法返回零，因此amount_nok / rate_Nok_Eur会给您错误，

您需要指定拥有getRate('NOK', 'EUR')的情况

需要帮助解决“ ZeroDivisionError：被零除”

1 个答案: