docs: def get_list(medium, user, credentials):
      """Returns a MediumList (Anime or Manga depends on [medium]) of user.
      If user is not given, the username is taken from the initialized auth
      credentials.
      :param medium Anime or manga (tokens.Medium.Anime or tokens.Medium.Manga)
      :param user   The user whose list should be grabbed. May use credentials[0].
      """
      helpers.check_creds(credentials, header)
      list_url = helpers.get_list_url(medium, user)
      #for some reason, we don't need auth.
      list_resp = requests.get(list_url, headers=header)
      if constants.TOO_MANY_REQUESTS in list_resp.text:
          return helpers.reschedule(get_list, constants.DEFAULT_WAIT_SECS, medium,
                                    user)
  
      list_soup = BeautifulSoup(list_resp.text, 'lxml')
      return objects.MediumList(medium, list_soup)