class Bygaard:
    
    def __init__(self):
        self._leiligheter = [] # tom liste

    def legg_til_leilighet(self, leilighet):
        self._leiligheter.append(leilighet)

    def finn_leiliget(self, leilnr):
        for leil in self._leiligheter:
            if leil.hent_leilnr() == leilnr:
                return leil
        return None #unodvendig