Question

我的任务是在文本文件中记录ATM程序的事务。每次存款或取款后，您必须使用交易类型，存入/取出金额和更新余额更新文件。我能够获取文本文件以打印出当前余额，但仅限一次存款/取款。此外，当程序运行时，它应该打开包含事务的文件并找到帐户的当前余额，但每次运行程序时，新文本只会替换旧文本。这是我的代码：

balancefile=open("balancefile.txt", "w")
balancefile.write("Starting balance is $10000 \n")
USER_BALANCE=10000
name=input("What is your name? ")
print(name +"," + " " + "Your current balance is: $" + str(USER_BALANCE))
while True:
    answer=input("Would you like to deposit, withdraw, check balance, or exit? ")
    if answer=="deposit" or answer== "Deposit":
        x= input("How much would you like to deposit? ")
        USER_BALANCE += float(x)
        print (name + "," + " " + "Your new balance is: $" + str(USER_BALANCE))
        balancefile.write("You have deposited an amount of $" + x + "." + " " + "Current balance is $" + str(USER_BALANCE) +"\n")
        continue
    elif answer== "withdraw" or answer== "Withdraw":
        y= input("How much would you like to withdraw? ")
        if float (y)<=USER_BALANCE:
            USER_BALANCE -= float(y)
            print (name + "," + " " + "Your new balance is: $" + str(USER_BALANCE))
            balancefile.write("You withdrew an amount of $" + y + "." + " " + "Current balance is $" + str(USER_BALANCE) + "\n")
            continue
        else:
            print ("Cannot be done. You have insufficient funds.")
    elif answer== "check balance" or answer== "Check Balance":
        print ("$" + str(USER_BALANCE))
    elif answer== "exit" or answer== "Exit":
        print ("Goodbye!")
        balancefile.close()
        break
    else:
        print ("I'm sorry, that is not an option")

请帮忙！为了澄清，帐户中的原始金额是10,000美元，但您应该能够在退出文本文件中的最后更新余额后重新输入程序。

Answer 1

作为the commenters have noted，文件模式'w'将截断文件proir进行写入，'a'将打开一个文件进行追加。这将进一步详细描述in the Python documentation。

Python中ATM程序的交易记录

1 个答案: