docs: def url(sport, league_id, team_id, start_date=None):
      """
      Given sport name, league_id, team_id, and optional start date (YYYY-MM-DD),
      return the url for the fantasy team page for that date (default: today)
      """
      url = '%s/%s/%s/' % (SPORT_URLS[sport], league_id, team_id)
      if start_date is not None:
          url += 'team?&date=%s' % start_date
      return url