Question

money =20

items = {'apple': 2, 'banana': 4, 'orange': 6}
for item_name in items:
    print('--------------------------------------------------')

    print("You have "+ str(money)+" dollars in your wallet")

    print('Each ' + item_name + ' costs ' + str(items[item_name]) + ' dollars')

    input_count = input('How many ' + item_name + 's do you want?: ')
    print('You will buy ' + input_count + ' ' + item_name + 's')

    count = int(input_count)
    total_price = items[item_name] * count
    print('The total price is ' + str(total_price) + ' dollars')


    if money >= total_price:
        print("You have bought "+str(input_count)+" "+str(item_name)+"s")

        money = money-total_price
    elif money < total_price:
        print("You do not have enough money")
        print("You cannot buy that many"+str(item_name)+"s")

print(str(money)+" dollars left in your wallet")
input("do want to buy somehing else: ")

if input() =="yes":

输出：

You have 20 dollars in your wallet
Each banana costs 4 dollars
How many bananas do you want?: 2
You will buy 2 bananas
The total price is 8 dollars
You have bought 2 bananas
-----------------------------------
You have 12 dollars in your wallet
Each apple costs 2 dollars
How many apples do you want?: 2
You will buy 2 apples
The total price is 4 dollars
You have bought 2 apples
-----------------------------------
You have 8 dollars in your wallet
Each orange costs 6 dollars
How many oranges do you want?: 1
You will buy 1 oranges
The total price is 6 dollars
You have bought 1 oranges
2 dollars left in your wallet

你的钱包还剩2美元所以我们还剩2美元，我想再次进入循环：

如果使用print（“你想买别的东西”），如果用户输入yes，那么在for循环内再次转到，如果没有则退出该程序。

但是我很难做到这样

Answer 1

未经测试，但我认为您可以执行以下操作：

money =20
items = {'apple': 2, 'banana': 4, 'orange': 6} 

while True:
    for item_name in items:
        print('--------------------------------------------------')

        print("You have "+ str(money)+" dollars in your wallet")

        print('Each ' + item_name + ' costs ' + str(items[item_name]) + 'dollars')

        input_count = input('How many ' + item_name + 's do you want?: ')
        print('You will buy ' + input_count + ' ' + item_name + 's')

        count = int(input_count)
        total_price = items[item_name] * count
        print('The total price is ' + str(total_price) + ' dollars')


        if money >= total_price:
            print("You have bought "+str(input_count)+""+str(item_name)+"s")

            money = money-total_price
        elif money < total_price:
            print("You do not have enough money")
            print("You cannot buy that many"+str(item_name)+"s")

    print(str(money)+" dollars left in your wallet") input("do want to buy somehing else: ")

    if input() != "yes":
        break

这会循环while循环的内容。如果输入“yes”，则break命令会跳出循环并停止所有操作。

编辑：等等......代码改变了，而我写了答案。尽管如此，把它放在while-Loop中它应该可行

Edit2：修正了一个错误，每个循环中的钱不应该设置为20，并且这些项也不需要重置。

Answer 2

将代码放在类方法中并再次调用该类。

Answer 3

您需要做的是执行for循环，而条件 true 。幸运的是，Python以while循环的形式提供了这个功能。

money = 20
items = {'apple': 2, 'banana': 4, 'orange': 6}
while money > 0:
    for item_name in items:
        print('--------------------------------------------------')

        print("You have "+ str(money)+" dollars in your wallet")

        print('Each ' + item_name + ' costs ' + str(items[item_name]) + '  dollars')

        input_count = input('How many ' + item_name + 's do you want?: ')
        print('You will buy ' + input_count + ' ' + item_name + 's')

        count = int(input_count)
        total_price = items[item_name] * count
        print('The total price is ' + str(total_price) + ' dollars')


        if money >= total_price:
            print("You have bought "+str(input_count)+" "+str(item_name)+"s")

            money = money-total_price
        elif money < total_price:
            print("You do not have enough money")
            print("You cannot buy that many"+str(item_name)+"s")

    print(str(money)+" dollars left in your wallet")
    user_input = input("do want to buy something else: ")

    if user_input != "yes":
        break

for循环完成后，程序会询问用户是否要购买其他东西。如果它们没有钱，则while循环条件将为false，这意味着程序将结束，因为while循环之后没有代码。

希望这有帮助！

如何再次进入循环内部

3 个答案: