larger boards and more complex gamespytoe' move selection algorithms become even more useful pytoe source code (externalpytoe is big system that assumes some ai background knowledge and doesn' really demonstrate anything new in terms of guis moreoverit was written for python over decade agoand though ported to for this editionsome of it might be better recoded from scratch today partly because of thatbut mostly because have page limit for this booki' going to refer you to the book' examples distribution package for its source code instead of listing it here please see these two files in the examples distribution for pytoe implementation detailspp \ai\tictactoe\tictactoe py top-level wrapper script pp \ai\tictactoe\tictactoe_lists py the meat of the implementation pytoea tic-tac-toe game widget