提供互联网服务的程序

Question

我正在写一个互联网服务提供商程序。我对代码的问题是它不能正确打印每月账单。你知道吗

例如： 如果用户输入包“A”和使用的小时数（例如9小时） 当调用printBill函数时，它应该打印9.95

我的问题是：如何从getPackage（）调用函数printBill（）的数据

#Bill for Package A
def getPackageA(hours):
    if (hours < 10):
        return 9.95 #Cost of Package A
    else:
        return (hours-10)*2 + 9.95

#Bill for Package B
def getPackageB(hours):
    if (hours < 20):
        return 13.95 #Cost of Package B
    else:
        return (hours - 20) + 13.95

#Bill for Package C
def getPackageC():
    return 19.95 #Cost of Package C

#Print Bill and savings
def printBill(bill):
    if (bill != 0):
        print("Your monthly bill is $", format(bill, '.2f'), 
        sep = '')
        getSavings(bill)
        print()
        print()
    else:
        print()


#Checks and display savings if applicable
def getSavings(bill):
    if(bill > getPackageA(hours)):
        print("If you had package A, you'd save $",\
            format(bill - getPackageA(hours),'.2f'), sep = 
            '')
    if(bill > getPackageB(hours)):
        print("If you had package B, you'd save $",\
            format(bill - getPackageB(hours),'.2f'), sep = 
            '')
    if(bill > getPackageC()):
        print("If you had package C, you'd save $",\
              format(bill - getPackageC(), '.2f'), sep = '')

def main():
    bill = 1
    #Asks user to enter choice of package and hours used
    packageChoice = str(input("Enter package purchased (A, 
    B, or C): "))
    hours = int(input("Enter the number of hours used: "))

    if(packageChoice == 'A' or packageChoice == 'a'):
        getPackageA(hours)
    elif (packageChoice == 'B' or packageChoice == 'b'):
        getPackageB(hours)
    elif (packageChoice == 'C' or packageChoice == 'c'):
        getPackageC()
    else:
        print("Package choice must be A, B, or C.")

    printBill(bill)

main()

Answer 1

你需要把时间花在每一个需要使用它的函数上，而且当你返回一些东西时，它需要一个可以返回的地方。所以你是说如果小时数是<；10，返回9.95，但是当你说return时，它会把代码发送回它被调用的地方，你没有把它赋给一个变量，所以bill默认为1美元。下面是更新后的代码

    #Bill for Package A
def getPackageA(hours):
    if hours < 10:
        return 9.95 #Cost of Package A
    else:
        return (hours-10)*2 + 9.95


#Bill for Package B
def getPackageB(hours):
    if hours < 20:
        return 13.95 #Cost of Package B
    else:
        return (hours - 20) + 13.95


#Bill for Package C
def getPackageC():
    return 19.95 #Cost of Package C


#Print Bill and savings
def printBill(bill, hours):
    if (bill != 0):
        print("Your monthly bill is $", format(bill, '.2f'), sep='')
        getSavings(bill, hours)
        print('\n')


#Checks and display savings if applicable
def getSavings(bill, hours):
    if bill > getPackageA(hours):
        print("If you had package A, you'd save $",\
            format(bill - getPackageA(hours),'.2f'), sep='')
    if bill > getPackageB(hours):
        print("If you had package B, you'd save $",\
            format(bill - getPackageB(hours),'.2f'), sep='')
    if bill > getPackageC():
        print("If you had package C, you'd save $",\
              format(bill - getPackageC(), '.2f'), sep='')


def main():
    bill = 1
    #Asks user to enter choice of package and hours used
    packageChoice = str(input("Enter package purchased (A, B, or C): "))
    hours = int(input("Enter the number of hours used: "))

    if packageChoice in ('a', 'A') :
        bill = getPackageA(hours)
    elif packageChoice.lower() == 'b':
        bill = getPackageB(hours)
    elif packageChoice.upper() == 'C':
        bill = getPackageC()
    else:
        print("Package choice must be A, B, or C.")

    printBill(bill, hours)


main()

我还编辑了main（）函数以显示检查响应的不同方法。您也不需要在IF语句中用Python的方括号将内容包装起来。你知道吗

Answer 2

可以向函数传递多个参数。你知道吗

def printBill(bill)

变成：

def printBill(bill,hours):

你称之为：

printBill(bill,hours)

您还必须以同样的方式将其传递给getSavings。你知道吗

Answer 3

要回答您的问题，您只需执行以下操作：

bill = 1
bill += getPackage()  # call function and add return value to total bill
printBill(bill)