编写一段满足设计原则的用户登录注册程序代码

以下是一段满足设计原则的用户登录注册程序代码：

1. 单一职责原则：将登录和注册功能分开实现，每个函数只负责一个功能。

class User:
    def __init__(self, username, password):
        self.username = username
        self.password = password

class Login:
    def login(self, username, password):
        user = self.get_user(username)
        if user and user.password == password:
            print("登录成功")
        else:
            print("用户名或密码错误")

    def get_user(self, username):
        # 根据用户名获取用户信息
        pass

class Register:
    def register(self, username, password):
        user = User(username, password)
        self.save_user(user)
        print("注册成功")

    def save_user(self, user):
        # 将用户信息保存到数据库或文件中
        pass

2. 开放封闭原则：对修改关闭，对扩展开放。可以通过继承和多态来实现。

class Login:
    def login(self, username, password):
        user = self.get_user(username)
        if user and user.password == password:
            self.success()
        else:
            self.fail()

    def get_user(self, username):
        # 根据用户名获取用户信息
        pass

    def success(self):
        # 登录成功后的操作
        pass

    def fail(self):
        # 登录失败后的操作
        pass

class EmailLogin(Login):
    def get_user(self, email):
        # 根据邮箱获取用户信息
        pass

class PhoneLogin(Login):
    def get_user(self, phone):
        # 根据手机号获取用户信息
        pass

3. 依赖倒置原则：高层模块不应该依赖底层模块，而应该依赖其抽象。抽象不应该依赖细节，细节应该依赖抽象。

class UserGateway:
    def get_user(self, username):
        # 获取用户信息
        pass

    def save_user(self, user):
        # 保存用户信息
        pass

class Login:
    def __init__(self, user_gateway):
        self.user_gateway = user_gateway

    def login(self, username, password):
        user = self.user_gateway.get_user(username)
        if user and user.password == password:
            self.success()
        else:
            self.fail()

    def success(self):
        # 登录成功后的操作
        pass

    def fail(self):
        # 登录失败后的操作
        pass

class Register:
    def __init__(self, user_gateway):
        self.user_gateway = user_gateway

    def register(self, username, password):
        user = User(username, password)
        self.user_gateway.save_user(user)
        print("注册成功")

4. 接口隔离原则：客户端不应该依赖它不需要的接口，一个类对另一个类的依赖应该建立在最小的接口上。

class Login:
    def __init__(self, user_gateway):
        self.user_gateway = user_gateway

    def login(self, username, password):
        user = self.user_gateway.get_user(username)
        if user and user.password == password:
            self.success()
        else:
            self.fail()

    def success(self):
        # 登录成功后的操作
        pass

    def fail(self):
        # 登录失败后的操作
        pass

class Register:
    def __init__(self, user_gateway):
        self.user_gateway = user_gateway

    def register(self, username, password):
        user = User(username, password)
        self.user_gateway.save_user(user)
        print("注册成功")

class UserGateway:
    def get_user(self, username):
        # 获取用户信息
        pass

    def save_user(self, user):
        # 保存用户信息
        pass

class EmailGateway:
    def get_user_by_email(self, email):
        # 根据邮箱获取用户信息
        pass

class PhoneGateway:
    def get_user_by_phone(self, phone):
        # 根据手机号获取用户信息
        pass