Question

        def main():
           selectionvalid = False
           print("Welcome to virtue vending machine!")
           print("Machine only takes $1 bills")
           table()
           while True:
               user = input("Select your choice:")
               if user == 'A1':
                   selectionvalid = True
                   print("Snickers: $.89")
                   change = bills() - a1
               elif user == 'A2':
                   print("M&Ms: $1.39")
                   change = bills() - a2
                   selectionvalid = True
               elif user == 'A3':
                   print("M&Ms: $1.39")
                   change = bills() - a2
                   selectionvalid = True
               elif user == 'B1':
                   print("Lays: $.50")
                   change = bills() - a3
                   selectionvalid = True
               elif user == 'B2':
                   print("Doritos: $.50")
                   change = bills() - a3
                   selectionvalid = True
               elif user == 'B3':
                   print("Cheetos: $1.49")
                   change = bills() - a5
                   selectionvalid = True
               elif user == 'C1':
                   print("TicTac: $1.04")
                   change = bills() - a6
                   selectionvalid = True
               elif user == 'C2':
                   selectionvalid = True
                   print("Starburst: $.79")
                   change = bills() - a7
               elif user == 'C3':
                   selectionvalid = True
                   print("Skittles: $2.49")
                   change = bills() - a8
               else:
                   print("Item not available.")
                   print("Please, select your choice again:")
               if selectionvalid == True:
                   print("Your change is:$", format(change, '.2f'))
                   message()
                   break
               return selectionvalid

        def bills():
           totals = 0 
           bills = int(input("Insert your bills:$"))
           while bills > 4:
            print("Please, enter less than $4")
            bills = int(input("Insert your bills:$"))
           else:
            print("You've inserted $",bills,"dollars")
            return bills


        def message():
            print("Your,",,"is dispensed below!")
            print("Thank you! Come Again!")

我试图让用户输入选择显示为def消息（）是否有另一种方法可以将if-elif-else中的代码压缩成更像循环的东西？我听说过字典和列表，但我认为这似乎太复杂了。例如：＆＃34;你的窃笑＆＃39;分配在＆＃34; ＆＃34;你＆＃39; Kitkat＆＃39;分发在＆＃34;

之下

谢谢

Answer 1

字典比你现有的字典更复杂？字典会清理你的很多代码并获得1/3的代码，主要是elif s

vendingdict = {"A1": ["Snickers", 0.89],
               "A2": ["M&Ms", 1.39],
               "A3": ["Lays", 0.50]}
def main():
    global myselection
    while True:
        myselection=input("Welcome to virtue vending machine!\nMachine only takes $1 bills\nSelect your choice:\n")
        try:
            if vendingdict[myselection] != None:
                break
        except KeyError:
            print("\nPlease input valid selection\n")
            continue

def bills():
    while True:
        try:
            cashin = int(input("Insert your bills: $"))
        except ValueError:
            print("Please insert valid tender!")
            continue
        cashout = 0
        if cashin>=vendingdict[myselection][1]:
            cashout = cashin - vendingdict[myselection][1]
            print("Your change is $%.2f" % cashout)
            print("Your %s is below!" % vendingdict[myselection][0])
            break
        else:
            print("Insufficient money, please insert more.")
            print(cashin)
            cashin = 0
            continue


main()
bills()

Answer 2

为什么不能将用户输入选择作为参数发送到message()？也许创建一个字典products，用户输入作为键，产品作为值。然后是message(products[userInput])。

如何将输入变量传递给另一个def？

2 个答案: