Make a Stack.py module that subclasses VisualizationApp and
implements the Push and Pop operations in the realStack.py visualization.
Make the cell size and font smaller so it's easy to show a stack of 8 items
with the default canvas size. Add a pointer for the "top" of the stack.
Make a Stack.py module that subclasses VisualizationApp and implements the Push and Pop operations in the realStack.py visualization. Make the cell size and font smaller so it's easy to show a stack of 8 items with the default canvas size. Add a pointer for the "top" of the stack.