async_main.py

import datetime
from bs4 import BeautifulSoup
from fake_useragent import UserAgent
import aiohttp
import aiofiles
import asyncio
from aiocsv import AsyncWriter


async def collect_data(city_code='2398'):
    cur_time = datetime.datetime.now().strftime('%d_%m_%Y_%H_%M')
    ua = UserAgent()

    headers = {
        'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
        'User-Agent': ua.random
    }

    cookies = {
        'mg_geo_id': f'{city_code}'
    }

    async with aiohttp.ClientSession() as session:

        response = await session.get(url='https://magnit.ru/promo/',
                                     headers=headers, cookies=cookies)
        soup = BeautifulSoup(await response.text(), 'lxml')

        city = soup.find('a', class_='header__contacts-link_city').text.strip()
        cards = soup.find_all('a', class_='card-sale_catalogue')

        data = []
        for card in cards:
            card_title = card.find('div',
                                   class_='card-sale__title'
                                   ).text.strip()

            try:
                card_discount = card.find('div',
                                          class_='card-sale__discount'
                                          ).text.strip()
            except AttributeError:
                continue

            card_price_old_integer = card.find('div',
                                               class_='label__price_old').find(
                'span', class_='label__price-integer').text.strip()
            card_price_old_decimal = card.find('div',
                                               class_='label__price_old').find(
                'span', class_='label__price-decimal').text.strip()
            card_old_price = f'{card_price_old_integer}.{card_price_old_decimal}'

            card_price_integer = card.find('div',
                                           class_='label__price_new').find(
                'span', class_='label__price-integer').text.strip()
            card_price_decimal = card.find('div',
                                           class_='label__price_new').find(
                'span', class_='label__price-decimal').text.strip()
            card_price = f'{card_price_integer}.{card_price_decimal}'

            card_sale_date = card.find('div',
                                       class_='card-sale__date').text.strip().replace(
                '\n', ' ')

            data.append(
                [card_title, card_discount, card_old_price, card_price,
                 card_sale_date]
            )

    async with aiofiles.open(f'{city}_{cur_time}.csv', 'w') as file:
        writer = AsyncWriter(file)

        await writer.writerow(
            [
                'Продукт',
                'Старая цена',
                'Новая цена',
                'Процент скидки',
                'Время акции',
            ]
        )
        await writer.writerows(
            data
        )

    return f'{city}_{cur_time}.csv'


async def main():
    await collect_data(city_code='2398')


if __name__ == '__main__':
    asyncio.run(main())