为什么这不起作用？ "d is not defined"

Question

我目前正在 python 进行娱乐用途，但此 ATM 脚本运行不正确，请帮助。

def balance():
    balance=7.52
    return balance
    print("Hi, Welcome to the Atm.")
    print("no need for pin numbers, we already know who you are")
    print("please selection one of the options given beneath")
    print("""
            D = Deposit
            W = Withdrawal
            T = Transfer
            B = Balance check
            Q = Quick cash of 20$
            E = Exit
            Please select in the next line.""")

def option():
    option = input("which option would you like?:")
    return option
    input("which option would you like?:")
    if option == "D":
        print("How much would you like to deposit?")
        amount = (int(input("amount:")))
        total = amount + balance

Answer 1

您似乎在使用 Python 2，其中 input attempts to evaluate what the user types as though it were a Python statement. You should instead use raw_input 没有。

Answer 2

当脚本问你 "which option would you like?:" 你必须键入 "D" 或 'D' 而不是 D 导致输入功能时，我认为你应该使用 raw_input

而且您还会遇到其他问题：

total=amount+balance

调用函数必须加()

total=amount+balance()

加上这一行：

if option =="D":

原因选项未定义。

option = option()

Answer 3

def balance():
    balance=7.52
    return balance
    print("Hi, Welcome to the Atm.")
    print("no need for pin numbers, we already know who you are")
    print("please selection one of the options given beneath")
    print("""
    D = Deposit
    W = Withdrawal
    T = Transfer
    B = Balance check
    Q = Quick cash of 20$
    E = Exit
    Please select in the next line.   """)
def option():
    option=input("which option would you like?:")
    return option
    input("which option would you like?:")
    if option =="D":
        print("How much would you like to deposit?")
        amount=(int(input("amount:")))
        total=amount+balance

您需要正确缩进您的代码，因此它看起来像这样（查找）：
input 仅用于 Python 3.x。 Python 3.x 版本相当于 raw_input，Python 2.x 版本。不建议对变量和函数使用相同的名称，因为会造成混淆。最好重命名其中之一。如果您使用 Python 3.x，那么您需要修正缩进。试试 Python 2.7 Docs or the Python 3.x Docs

为什么这不起作用？ "d is not defined"

Why does this not work? "d is not defined"

python

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