python - 投票 If/Else/Elif

Question

Python(以及 StackOverflow)新手。试图弄清楚如何让它正确执行。虽然程序本身执行得很好，但我希望它没有额外的步骤。我的意思是，如果第一个语句失败，我想终止并打印与 else 语句相关的消息。

def main():

    # init
    messageOne = 'You are too young to vote.'
    messageTwo = 'You can vote.'
    messageThree = 'You need to register before you can vote.'

    # input
    age = int(input('Please enter your age: '))
    registration = input('Are you registered to vote(Y/N)?: ')

    # calculate / display
    if age >= 18:
        if registration.upper() == "Y":
            print(messageTwo)
        else:
            print(messageThree)
    else:
        print(messageOne)

main()

Answer 1

程序写得很好。我唯一想改变的是在检查 age >= 18 (所以如果用户未满 18 岁，则不会被询问是否已注册)。我不会改变任何其他事情。

def main():

    # init
    messageOne = 'You are too young to vote.'
    messageTwo = 'You can vote.'
    messageThree = 'You need to register before you can vote.'

    # input
    age = int(input('Please enter your age: '))

    # calculate / display
    if age >= 18:
        registration = input('Are you registered to vote(Y/N)?: ')
        if registration.upper() == "Y":
            print(messageTwo)
        else:
            print(messageThree)
    else:
        print(messageOne)

main()