Question

该脚本一直运行到“＃”;调用函数然后在它应该运行函数时停止。它不会停止任何错误。这是为什么？

# Please note that this only works in integer values, since there is no change in pence
notes = (1,5,10,20,50) #Value of notes
quantities = [10,8,5,5,1] #Quantities of notes
# Defining variables
notesout = []
total = 0
x = -1
payment = []
# This loop works out the total amount of cash in the cash register
while (x < 4):
        x += 1
        calc = notes[x]*quantities[x]
        total += calc
mon_nd = 70 # Money needed
def takenotes():
        print("Please input each notes value, when finished type \"stop\"")
        # If input is an int then add to payment list, if not then work out the change
        payment = [20,20,20,20]
        main()

def main():
        # Finds the value of the cash given
        paymentV = sum(payment)
        changeT = paymentV - mon_nd
        # Change the quantities of the 'quantities' variable
        for i in payment:
                quantities[notes.index(i)] = quantities[notes.index(i)] + 1
        while(changeT < 0):
                # Works out what amount of change should be given
                for i in reversed(notes):
                        if (changeT - i >= 0):
                                notesout.append(i)
                                quantities[notes.index(i)] = quantities[notes.index(i)]-1
                                changeT -= i
                        else:
                                return True
        print(notesout)
takenotes()

Answer 1

它没有＆＃34;只是停止＆＃34;。 takenotes来电main;它进入while循环内的for循环;第一轮，changeT - i不大于0，因此返回True。由于您没有对main的返回值执行任何操作，因此不打印任何内容，程序结束。

Answer 2

首先，您需要global语句来更改任何全局变量（例如payment）。

payment = []

def takenotes():
    global payment
    payment = [20, 20, 20, 20]

您的代码中也没有input()函数。请参阅the docs。

Answer 3

此脚本正确运行。它调用pmotes（）函数然后正常执行它（显示消息，设置本地支付数组，然后执行main（）函数）。您可以在this online Python interpreter上查看此信息。您也可以逐步执行here来查看脚本的确切功能。

此外，当您要编辑全局变量时，必须使用全局语句。阅读this SO question的答案以获取更多信息。

Python没有运行调用函数

3 个答案: