Gets player/coach/umpire information for the game with matching id.

def players(game_id):
    """Gets player/coach/umpire information for the game with matching id."""
    # get data
    data = mlbgame.data.get_players(game_id)
    # parse data
    parsed = etree.parse(data)
    root = parsed.getroot()

    output = {}
    output['game_id'] = game_id

    # get player/coach data
    for team in root.findall('team'):
        type = team.attrib['type'] + "_team"
        # the type is either home_team or away_team
        output[type] = {}
        output[type]['players'] = []
        output[type]['coaches'] = []

        for p in team.findall('player'):
            player = {}
            for key in p.keys():
                player[key] = p.get(key)
            output[type]['players'].append(player)

        for c in team.findall('coach'):
            coach = {}
            for key in c.keys():
                coach[key] = c.get(key)
            output[type]['coaches'].append(coach)

    # get umpire data
    output['umpires'] = []
    for u in root.find('umpires').findall('umpire'):
        umpire = {}
        for key in u.keys():
            umpire[key] = u.get(key)
        output['umpires'].append(umpire)

    return output