Method stackable_on

python/Chapter 9/Question9_10/tallest_stack.py:52–54

Return a Stack with the Boxes that can be stacked on 'bottom'.

(self, bottom)

    """ An immutable (and hashable) set of Boxes. """

    def stackable_on(self, bottom):
        """ Return a Stack with the Boxes that can be stacked on 'bottom'. """
        return Stack(box for box in self if box < bottom)

    def subtract(self, box):
        """ Return a new Stack with 'box' removed. """