from album_base import AlbumBase
class AlbumPreu(AlbumBase):
    def __init__(self, titol, autor, npeces, preu):
        super().__init__(titol, autor, npeces)
        self.preup = preu
    def cost_total(self, smin):
        it = filter(lambda x: x.durada.seconds >= smin, self)
        it2 = map(lambda x: x.durada.seconds*self.preup, it)
        return sum(it2)