How to send messages by VK bot?

Question

Python

Good day! I am new to Python programming and VK API. I want to send messages to users of the VKontakte bot.
That is, at some specific time, the bot will send a message to all people who have ever written a message to the bot. There is a lot of rubbish on the Internet and I did not find an answer to this question. I will be grateful for help.

import vk_api
import time
from vk_api.longpoll import VkLongPoll, VkEventType

key = "токен"
vk_session = vk_api.VkApi(token = key)
longpoll = VkLongPoll(vk_session)
vk = vk_session.get_api()
users = vk.users

for event in longpoll.listen():
   if event.type == VkEventType.MESSAGE_NEW and event.to_me and event.text :
       if(event.text.lower() == "привет"):
           name = users.get(user_ids = event.user_id,fields='first_name')[0]['first_name']
           vk.messages.send(
               user_id=event.user_id,
               random_id=time.time(),
               message="Здравствуй " + name
           )

Answer 1

Create a list of users and send a message at the right time