Return the standings file for current standings (given current date).

def get_standings(date):
    """Return the standings file for current standings (given current date)."""
    try:
        return urlopen(STANDINGS_URL.format(date.year,
                                            date.strftime('%Y/%m/%d')))
    except HTTPError:
        ValueError('Could not find the standings file. '
                   'mlb.com does not provide the file that '
                   'mlbgame needs to perform this operation.')