讓輸入在 python 中相互疊加

Question

我是初學者，我正在研究一個簡單的信用計划。 我希望它能正常工作，所以每次我添加一個數字輸入時，它都會存儲在一個顯示我的總余額的變量中。 現在的問題是該程序只是一個一次性程序，因此我輸入的輸入不會保存到變量中，因此當我輸入另一個值時，它會被添加到先前的輸入中。 代碼如下：

Purchase = int(input("How much was your purchase? "))


credit_balance = 0

credit_limit = 2000


Total = credit_balance + Purchase
    
print("Your account value right now: ", Total)


if Total == credit_limit:
    print("You have reached your credit limit!", Total)

Answer 1

您需要引入一個 while 循環來讓它繼續運行。 試試這個：

credit_limit = 2000
credit_balance = 0

while True:

    print('Welcome to the Credit Card Company')
    Purchase = int(input("How much was your purchase? "))
    Total = credit_balance + Purchase

    print("Your account value right now: ", Total)

    if Total >= credit_limit:
        print("You have reached your credit limit!", Total)

請注意，這將使它無限期地繼續下去。 您需要為用戶添加邏輯以輸入退出命令。 你可以使用類似的東西：

    print('Welcome to the Credit Card Company')
    Purchase = int(input("How much was your purchase? Or type Exit to exit."))

然后：

if Purchase == 'Exit':
    exit()

編輯：

這是一個每次都保留余額的版本。 關鍵區別在於變量可以等於其先前值加上更改。 為了清楚起見，我重寫了一些內容。

credit_limit = 2000
current_balance = 0

while True:

    print('Welcome to the Credit Card Company')
    Purchase = int(input("How much was your purchase? "))
    current_balance = current_balance + Purchase

    print("Your account value right now: ", current_balance)

    if current_balance == credit_limit:
        print("You have reached your credit limit!", current_balance)

Answer 2

如果使用 while 循環，則可以無限地獲取用戶輸入：

credit_balance = 0
credit_limit = 2000

while True:
    purchase = int(input("How much was your purchase? "))
    credit_balance += purchase  # add purchase to credit_balance
    
    print("Your account value right now: ", credit_balance)
    
    if credit_balance >= credit_limit:
        print("You have reached/exceeded your credit limit!", Total)

一個很好的練習是添加一些邏輯以確保購買不超過信用額度。