import valve.source
import valve.source.a2s
import valve.source.master_server

with valve.source.master_server.MasterServerQuerier() as msq:
    try:
        print('Looking up servers...')
        for address in msq.find(gamedir=u"arma3"):
            with valve.source.a2s.ServerQuerier(address) as server:
                info    = server.info()
                players = server.players()
                print(info['server_name'])

    except Exception as e:
        print('Exception: %s' % (e))