to save real estate here to study pytreesee the following directoryc:\pp \dstruct\treeview also like pyformthe documentation directory there has the original description of this example that appeared in the third edition of this bookpytree' code is in python formbut the third edition overview may not be as mentionedpytree is set up to display both the binary search trees of this and the expression parse trees of the next when viewing the latterpytree becomes sort of visual calculator--you can generate arbitrary expression trees and evaluate any part of them by clicking on nodes displayed but at this pointthere is not much more can show and/or tell you about those kinds of trees until you move on to data structures