利用python函数进行简单的账号密码验证

userName = ("zhangsan", "lisi", "wangwu", "zhaoliu", "xiaolin", "xiaohua")

pwList = ['123', '456', '789', '246', 'abc', 'abc1234']


def exist1():
    for j in range(3):

        username = input("请输入用户名:")
        if username not in userName:
            print('用户不存在')

        else:

            return userName.index(username)



    print("用户名输入超过3次")

    return -1


def exist2(a):
    if a == -1:
        return 0

    for i in range(3):

        password = input("请输入密码:")

        if pwList[a] == password:

            print("登陆成功")

            return 0

        else:

            print("密码不正确")



    print("密码输入超过3次")

    return 0


def regist():
    exist2(exist1())


regist()

输入正确结果：