class Building:
    material = 0
    color = 0
    number = 0
    place = None

    def set_material(self, material):
        self.material = material

    def set_colour(self, colour):
        self.colour = colour

    def set_number(self, number):
        self.number = number

    def place():
        if a.number < 0 :
            place = 'Out of stock'
        elif a.number > 0 and a.number <100:
            place = 'warehouse'
        else:
            place = 'Remote warehouse'