Question

我正在编写一个程序，提示用户输入一些信息以输出支付金额。显示金额后，程序会使用while循环询问用户是否要重复。在定义了计算支付金额的程序之后，有一个while循环重复输入的问题。问题是我找不到退出循环的方法。这是我到目前为止的内容：

def CalPay(hrs,rate):
    print('Please enter number of hours worked for this week:', hrs)
    print('What is hourly rate?', rate)
    try:
        hrs = float(hrs)
    except: 
        print('You entered wrong information for hours.')
        return
    try:
        rate=float(rate)
    except:
        print('You entered wrong rate information.')
        return
    if hrs < 0:
        print('You entered wrong information for hours.')
    elif rate < 0:
        print('You entered wrong rate information.')
    else:
        if hrs > 60:
            pay=((hrs-60)*2*rate)+(20*rate*1.5)+(rate*40)
            print('Your pay for this week is:', '$'+str(pay))
        elif hrs > 40:
            pay=((hrs-40)*1.5*rate)+(rate*40)
            print('Your pay for this week is:', '$'+str(pay))
        else:
            pay=rate*hrs
            print('Your pay for this week is:', '$'+str(pay))
    repeat=input('Do you want another pay calculation?(y or n)')
    while repeat == 'y' or 'Y':
        while True:
            try:
                hrs = float(input('Please enter number of hours worked for this week:'))
            except: 
                print('You entered wrong information for hours.')
                continue
            else:
                break
        while True:
            try:
                rate=float(input('What is hourly rate?'))
            except:
                print('You entered wrong rate information.')
                continue
            else:
                break
        if hrs < 0:
            print('You entered wrong information for hours.')
        elif rate < 0:
            print('You entered wrong rate information.')
        else:
            if hrs > 60:
                pay=((hrs-60)*2*rate)+(20*rate*1.5)+(rate*40)
                print('Your pay for this week is:', '$'+str(pay))
            elif hrs > 40:
                pay=((hrs-40)*1.5*rate)+(rate*40)
                print('Your pay for this week is:', '$'+str(pay))
            else:
                pay=rate*hrs
                print('Your pay for this week is:', '$'+str(pay))
        repeat=input('Do you want another pay calculation?(y or n)')
    print('Good Bye!')

Answer 1

您嵌套了while循环。您需要打破两者。

Answer 2

我认为您的问题是，每次计算后，它都会问您“是否要进行另一次工资计算（是y或n）”，并且如果您回答n，执行仍在循环内进行。

您正在使用以下条件

while repeat == 'y' or 'Y':    #this is wrong

在您写上述条件时，它实际上会解析为

while (repeat == 'y') or ('Y'):

此处第一个条件为假，而第二个条件为真。因此执行将在一段时间内完成。

请使用“ in”关键字，如下所示。

while repeat in ['y', 'Y']:    #I will prefer this.

或

while repeat == 'y' or repeat=='Y':

或

while repeat == ('y' or 'Y'):

希望这会对您有所帮助。

如何退出while循环？

2 个答案: