Vk Bot of lesson (3) | Carousel and new keyboard

import vk_api
from vk_api.longpoll import VkLongPoll, VkEventType
from config import token
from vktools import Keyboard, KeyboardButton, Carousel, CarouselButton

session = vk_api.VkApi(token=token)


def send_message(user_id, message, keyboard=None, carousel=None):
    post = {
        "user_id": user_id,
        "message": message,
        "random_id": 0
    }

    if keyboard != None:
        post["keyboard"] = keyboard.add_keyboard()
    if carousel != None:
        post["template"] = carousel.add_carousel()

    session.method("messages.send", post)


for event in VkLongPoll(session).listen():
    if event.type == VkEventType.MESSAGE_NEW and event.to_me:
        text = event.text.lower()
        user_id = event.user_id

        if text == "start":

            keyboard = Keyboard(
                [
                    [
                        KeyboardButton().text("RED", "negative"),
                        KeyboardButton().text("GREEN", "positive"),
                        KeyboardButton().text("BLUE", "primary"),
                        KeyboardButton().text("WHITE")
                    ],
                    [
                        KeyboardButton().openlink("YouTube", "https://youtube.com/c/Фсоки")
                    ],
                    [
                        KeyboardButton().location()
                    ]
                ]
            )

            send_message(user_id, "New Keyboard", keyboard)

        elif text == "test":
            carousel = Carousel(
                [
                    CarouselButton().openlink(
                        [
                            CarouselButton().element(
                                title="Title 1",
                                description="Description 1",
                                photo_id="-203980592_457239030",
                                link="https://vk.com/fsoky",
                                buttons=[KeyboardButton().text("Test button", "primary")]
                            ),
                            CarouselButton().element(
                                title="Title 2",
                                description="Description 2",
                                photo_id="-203980592_457239030",
                                link="https://vk.com/fsoky",
                                buttons=[KeyboardButton().text("Test button 2", "negative")]
                            ),
                        ]
                    )
                ]
            )

            send_message(user_id, "Carousel", carousel=carousel)