# Contenedores

class Camion:
    def __init__(self, c):
        if isinstance(c, ContenedorGranCapacidad):
            self.__class__ = Trailer

    @staticmethod
    def creaCamionPara(c):
        if isinstance(c, ContenedorGranCapacidad):
            return Trailer(c)
        else:
            return Camion(c)

    def __str__(self):
        return "camion"


class Trailer:
    def __init__(self, c):
        if isinstance(c, ContenedorNormal):
            self.__class__ = Camion

    def __str__(self):
        return "trailer"


class Barco:
    def __init__(self, contenedores):
        self._contenedores = contenedores

    def estaDescargado(self):
        return len(self._contenedores) == 0

    def descargaContenedor(self):
        return self._contenedores.pop()

    def __str__(self):
        return str.join(",".join([str(x) for x in self._contenedores]))


class Contenedor:
    pass


class ContenedorNormal(Contenedor):
    def __str__(self):
        return "contNormal"


class ContenedorGranCapacidad(Contenedor):
    def __str__(self):
        return "contGrande"


if __name__ == "__main__":
    b = Barco([ContenedorNormal(), ContenedorGranCapacidad(), ContenedorNormal()])
    while not (b.estaDescargado()):
        # Uso de herencia dinamica
        print(Camion(b.descargaContenedor()))
        # Uso de método estático
        # print(Camion.creaCamionPara(b.descargaContenedor()))