def send_message(vk_session, event, message):
    try:
        peer_id = None
        if event.from_user:
            peer_id = event.user_id
        elif event.from_chat:
            peer_id = event.chat_id + 2000000000
        vk_session.method('messages.send', {'peer_id': peer_id, 'message': message})
        return True
    except:
        return False

def kuchiyoseNoJutsu(event):
    users = self.vk.messages.getChat(chat_id=event.chat_id)
    msg = ""

    for user in users['users']:
        msg += "[id{}|User]".format(user)
    return send_message(vk_session, event, msg)