My very first Pyhton Script

my_first_pyhton_script.py

class LoginPresenter:
    def __init__(self):
        self.response = 0

    def present_response(self, response):
        self.response = response


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


class Usergateway:
    def __init__(self):
        user1 = User(1, "christian.bergau", "123")
        self.users = [user1]

    def find_by_username_and_password(self, username, password):
        for user in self.users:
            if (user.username == username) and (user.password == password):
                return user
        return 0


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

    def get_username(self):
        return self.username

    def get_password(self):
        return self.password


class LoginResponse:
    def __init__(self, userid, success):
        self.userid = userid
        self.success = success

    def is_successful(self):
        return self.success == 1

    def get_user_id(self):
        return self.userid


class LoginInteractor:
    def __init__(self, presenter, usergateway):
        self.presenter = presenter
        self.usergateway = usergateway

    def execute(self, request):
        response = LoginResponse
        user = self.usergateway.find_by_username_and_password(request.get_username(), request.get_password())
        if user == 0:
            response.userid = 0
            response.success = 0
        else:
            response.userid = user.userid
            response.success = 1

        self.presenter.present_response(response)


presenter = LoginPresenter()
usergateway = Usergateway()
interactor = LoginInteractor(presenter, usergateway)

request = LoginRequest("christian.bergau", "123")
interactor.execute(request)