class Nabolag: 
    def __init__(self): 
        self._hus = []
    
    def legg_til_hus(self, hus): 
        self._hus.append(hus)

    def antall_bad(self): 
        antall = 0
        for hus in self._hus: 
            for rom in hus.hent_romliste(): 
                if rom.hent_navn() == "Bad":
                    antall += 1
        return antall
    
    def __str__(self): 
        streng = ""
        i = 1
        for hus in self._hus: 
            streng += "\n\nHus " + str(i) + ": \n" + str(hus)
            i += 1
        return streng