期望表达式ATM

Question

我和youtube的视频一起使用python跟踪到ATM上，我得到了预期的表达。我不知道怎么修理它。第32、37和40行。

在这里输入图像描述

Answer 1

您不能在elif之后使用else。这是因为else将捕获所有剩余的案例。缩进，即行前的空格或制表符在Python中非常重要。

我认为你想写的是：

balance = 1000
print("""
Welcome to Dutch Bank
Choose Transaction
1) BALANCE
2) WITHDRAW
3) DEPOSIT
4) EXIT
""")

while True:
    option = int(input("Enter Transaction"))
    if option == 1:
        print ("Your Balance is", balance)
        anothertrans = input("Do You Want to make another Transaction? Yes/No: ")
        if anothertrans == "YES":
            continue
        else:
            break
    elif option == 2:
        withdraw = float(input("Enter Amount To Withdraw"))

        if (balance > withdraw):
            total = balance - withdraw
            print("Success")
            print("Your New Balance is: ",total)
        else:
            print("Insufficient Balance")

    elif option == 3:
        deposit = float(input("Enter Amount To Deposit"))
        totalbalance = balance + deposit
        print("Sucess")
        print("Total Balance Now is: ", totalbalance)

    elif option == 4:
        print("Thank You ForBanking With Dutch Bank")
        exit()
    else:
        print ("No selected Transaction")