Python 程序问题

因此，我创建了一个程序，要求用户从他们的支票账户中提取他们想要的金额。如果执行该程序，则支票应减去提取的金额。但是当我使用global时，即使在这个过程之后，它也不会改变变量的值。我已经建立了所有变量的值

我的代码在这里：

checking = 10000
savings = 10000
user_ammount_w = 0
user_currency_w = ""
def withdraw_saving (amount, country):
    global checking
    if country == "HKD":
        if checking >= amount:
            checking = checking - amount
            print("The amount of money left in your checking is", checking)
        else:
            print("Your request of", "$"+ str(amount), country, "is greater than the amount in your 
            checking account this withdraw will not work")

user_choice = input("Welcome to the ATM. Type 1 for withdrawing")
    if user_choice == "1":
        user_currency_w= input("Which currency would you like to withdraw from. For testing purposes 
        its only HKD")
        user_amount_w= int(input("How much money do you want to withdraw"))
        withdraw_saving (user_ammount_w, user_currency_w)

---

当您再次递归调用函数时，当您传入全局设置为

0

的

user\u amount\u w

时，您都将要减去的金额传递为0。相反，我怀疑您想要传入

user\u amount\w

，这是用于捕获用户输入的变量名

checking = 10000
savings = 10000
user_ammount_w = 0   #<----this is the value you passing to your function
user_currency_w = ""
def withdraw_saving (amount, country):
    global checking
    if country == "HKD":
        if checking >= amount:
            checking = checking - amount
            print("The amount of money left in your checking is", checking)
        else:
            print("Your request of", "$"+ str(amount), country, "is greater than the amount in your checking account this withdraw will not work")

    user_choice = input("Welcome to the ATM. Type 1 for withdrawing")
    if user_choice == "1":
        user_currency_w= input("Which currency would you like to withdraw from. For testing purposes its only HKD")
        user_amount_w= int(input("How much money do you want to withdraw")) #<--you never pass this value.
        withdraw_saving (user_ammount_w, user_currency_w)

withdraw_saving(20, 'HKD')

检查=10000
节省=10000
用户\u amount\u w=0#=金额：
支票=支票-金额
打印（“支票中的剩余金额为”，支票）
其他：
打印（“您对“，“$”+str（金额），国家/地区的请求”大于您的支票账户中本次提款将不起作用的金额”）
用户选择=输入（“欢迎使用自动取款机。输入1用于取款”）
如果用户_选项==“1”：
user_currency_w=input（“您希望从哪种货币中提取。出于测试目的，其仅为港币”）
user\u amount\u w=int（输入（“您想提取多少钱”）#查看
user\u amount\u w
vs.
user\u amount\u w
。