UnboundLocalError:赋值前引用的局部变量“”getBottles“”

Question

在Python3中，我得到了一个在赋值前引用的局部变量'getBottles‘。我真的不知道我做错了什么。赋值前引用是什么意思？

# Lab 5-4 The Bottle Return Program

#the main function
def main():
    endProgram = 'no'

    while endProgram == 'no':
        totalBottles = getBottles()
        totalPayout = calPayout (totalBottles)
        printInfo (totalBottles, totalPayout)

        #this function will get the number of bottles returned
        def getBottles():
            totalBottles = 0
            todayBottles = 0
            counter = 1
            while counter <= 7:
                todayBottles = input('Enter number of bottles for today: ')
                totalBottles = totalBottles + todayBottles
                counter = + 1
                return totalBottles

        #this function calculates the pay out amount   
        def calcPayout(totalBottles):
            totalPayout = 0
            totalPayout = totalBottles * 0.10
            return totalPayout

        #this funciton displays the results
        def printInfo (totalBottles, totalPayout):
            print('The total number of bottles collected is ', totalBottles)
            print('The total paid out is $', totalPayout)


    endProgram = input('Do you want to end the program? (Enter yes or no): ')

#calls main
main()

Answer 1

在python中，您必须在使用函数之前定义它们，这意味着在文档中的较低行号。这更接近于您想要的代码：

def getBottles():
    totalBottles = 0
    todayBottles = 0
    counter = 1
    while counter <= 7:
        todayBottles = input('Enter number of bottles for today: ')
        totalBottles = totalBottles + todayBottles
        counter = + 1
        return totalBottles



#this function calculates the pay out amount   
def calcPayout(totalBottles):
    totalPayout = 0
    totalPayout = totalBottles * 0.10
    return totalPayout

#this funciton displays the results
def printInfo (totalBottles, totalPayout):
    print('The total number of bottles collected is ', totalBottles)
    print('The total paid out is $', totalPayout)


def main():
    endProgram = 'no'

    while endProgram == 'no':
        totalBottles = getBottles()
        totalPayout = calPayout (totalBottles)
        printInfo (totalBottles, totalPayout)
        endProgram = input('Do you want to end the program? (Enter yes or no): ')

#calls main
main()