import bs4
import requests


def get_url(page):
    url_pattern = r'http://www.kazar.com/pl/sklep/kobieta/buty/filtry/strona,{}'
    return url_pattern.format(page)

if __name__ == '__main__':
    page = 1

    links = set()

    while True:
        url = get_url(page)
        response = requests.get(url)

        if response.status_code != 200:
            raise Exception('Bad status code {}'.format(response.status_code))

        soup = bs4.BeautifulSoup(response.content, 'html.parser')

        items = soup.find_all('a', class_='pr-see')

        before = len(links)

        for item in items:
            links.add(item['href'])

        if len(links) == before:
            break

    print(links)