Telebot update: add paginator (not working fully)

from django.core.management.base import BaseCommand

from django.conf import settings as main_settings

from django.utils.html import strip_tags

from django.db.models import Q

from django.urls import reverse

from opds_catalog.models import Book, Author

from opds_catalog import settings, dl

from opds_catalog.opds_paginator import Paginator as OPDS_Paginator

from sopds_web_backend.settings import HALF_PAGES_LINKS

from constance import config

from telegram.ext import Updater, CommandHandler, MessageHandler, Filters, RegexHandler, CallbackQueryHandler

from telegram import InlineKeyboardButton, InlineKeyboardMarkup, Document

        q_objects.add( Q(authors__search_full_name__contains=book_name.upper()), Q.OR)

        books = Book.objects.filter(q_objects).order_by('search_title', '-docdate').distinct()

        bcount = books.count()

        books_count = books.count()

        response = 'По Вашему запросу ничего не найдено, попробуйте еще раз.' if bcount==0 else 'Найдено %s книг(и) (Показано только 10 первых). \nВыберите нужную для скачивания.'%bcount

        if books_count == 0:

            response = 'По Вашему запросу ничего не найдено, попробуйте еще раз.'

            bot.send_message(chat_id=update.message.chat_id, text=response)

            self.logger.info("Send message to user %s: %s" % (update.message.from_user.username,response))

            return

        response = 'Найдено %s книг(и). \nВыберите нужную для скачивания.' % books_count

        bot.send_message(chat_id=update.message.chat_id, text=response)

        self.logger.info("Send message to user %s: %s" % (update.message.from_user.username, response))

        page_num = 1

        #op = OPDS_Paginator(books_count, 0, page_num, config.SOPDS_MAXITEMS, HALF_PAGES_LINKS)

        op = OPDS_Paginator(books_count, 0, page_num, 5, HALF_PAGES_LINKS)

        items = []

        prev_title = ''

        prev_authors_set = set()

        # Начаинам анализ с последнего элемента на предидущей странице, чторбы он "вытянул" с этой страницы

        # свои дубликаты если они есть

        summary_DOUBLES_HIDE = config.SOPDS_DOUBLES_HIDE

        start = op.d1_first_pos if ((op.d1_first_pos == 0) or (not summary_DOUBLES_HIDE)) else op.d1_first_pos - 1

        finish = op.d1_last_pos

        for row in books[start:finish + 1]:

            p = {'doubles': 0, 'lang_code': row.lang_code, 'filename': row.filename, 'path': row.path, \

                 'registerdate': row.registerdate, 'id': row.id, 'annotation': strip_tags(row.annotation), \

                 'docdate': row.docdate, 'format': row.format, 'title': row.title, 'filesize': row.filesize // 1000, \

                 'authors': row.authors.values(), 'genres': row.genres.values(), 'series': row.series.values(),

                 'ser_no': row.bseries_set.values('ser_no')

                 }

            if summary_DOUBLES_HIDE:

                title = p['title']

                authors_set = {a['id'] for a in p['authors']}

                if title.upper() == prev_title.upper() and authors_set == prev_authors_set:

                    items[-1]['doubles'] += 1

                else:

                    items.append(p)

                prev_title = title

                prev_authors_set = authors_set

            else:

                items.append(p)

        # "вытягиваем" дубликаты книг со следующей страницы и удаляем первый элемент который с предыдущей страницы и "вытягивал" дубликаты с текущей

        if summary_DOUBLES_HIDE:

            double_flag = True

            while ((finish + 1) < books_count) and double_flag:

                finish += 1

                if books[finish].title.upper() == prev_title.upper() and {a['id'] for a in books[

                    finish].authors.values()} == prev_authors_set:

                    items[-1]['doubles'] += 1

                else:

                    double_flag = False

            if op.d1_first_pos != 0:

                items.pop(0)

        response = ''

        for b in items:

            authors = ', '.join([a['full_name'] for a in b['authors']])

            response+='<b>%(title)s</b>\n%(author)s\n/download%(link)s\n\n'%{'title':b['title'], 'author':authors,'link':b['id']}

        buttons = [InlineKeyboardButton('1 <<', callback_data='/p1'),

                   InlineKeyboardButton('%s <'%op.previous_page_number , callback_data='/p%s'%op.previous_page_number),

                   InlineKeyboardButton('[ %s ]'%op.number , callback_data='/p%s'%op.number),

                   InlineKeyboardButton('> %s'%op.next_page_number , callback_data='/p%s'%op.next_page_number),

                   InlineKeyboardButton('>> %s'%op.num_pages, callback_data='/p%s'%op.num_pages)]

        markup = InlineKeyboardMarkup([buttons]) if op.num_pages>1 else None

        if bcount>0:

            for b in books[0:10]:

                authors = ', '.join([a['full_name'] for a in b.authors.values()])

                response='<b>%(title)s</b>\n%(author)s\n/download%(link)s\n\n'%{'title':b.title, 'author':authors,'link':b.id}

                bot.send_message(chat_id=update.message.chat_id, text=response, parse_mode='HTML')

        bot.send_message(chat_id=update.message.chat_id, text=response, parse_mode='HTML', reply_markup=markup)

    def downloadBooks(self, bot, update):

        book_id_set=re.findall(r'\d+$',update.message.text)