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The usefulness of the Filter class is that it can be used as a base class (superclass) for other classes, such as SPAMFilter, which filters out 'SPAM' from sequences: >>> s = SPAMFilter() >>> s.init() >>> s.filter(['SPAM', 'SPAM', 'SPAM', 'SPAM', 'eggs', 'bacon', 'SPAM']) ['eggs', 'bacon'] Note two important points in the definition of SPAMFilter: I override the definition of init from Filter by simply providing a new definition. The definition of the filter method carries over (is inherited) from Filter, so you don t have to write the definition again. The second point demonstrates why inheritance is useful: I can now make a number of different filter classes, all subclassing Filter, and for each one I can simply use the filter method I have already implemented. Talk about useful laziness...

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If you run this with ruby bot_data_to_yaml.rb fred.bot, you ll end up with a bot data file called fred.bot that contains the necessary data to converse with a basic bot.

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Here s a basic program that can use the Bot class, which reads input from the keyboard and prints the bot s responses to the screen:

require 'bot' bot = Bot.new(:name => 'Fred', :data_file => 'fred.bot') puts bot.greeting while input = gets and input.chomp != 'end' puts '>> ' + bot.response_to(input) end puts bot.farewell

It s almost the same as the script we thought of before implementing the Bot class. You used the method names dictated by that program and made it fit. (The completed source for the Bot class is provided in the next section if you want to refer to it.) Without further ado, give it a try and see if you can have a conversation. Here s a demonstration run:

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If you want to find out whether a class is a subclass of another, you can use the built-in method issubclass: >>> issubclass(SPAMFilter, Filter) True >>> issubclass(Filter, SPAMFilter) False

Hi. What would you like to talk about I don't know >> Are you always so indecisive Yes, usually >> Great. I'm sorry! >> There's no need to apologize. So why can't you talk to me properly >> Do you want me to talk to you properly Yes >> At least you're positive about something! I don't know about that >> Are you always so indecisive Woe is me, why can't I make decisions >> Do you want to make decisions Everyone does >> You think everyone does

Your bot works! The conversation might be a little stilted and manipulated to use some of the phrases and words covered by your data set, but with this basic mechanism, and a data set extended even further, significantly more complex conversations would be possible. Unfortunately, it s outside the scope of this book to provide a large data set. In the next section the final code for the basic bot is presented, and then you ll see how you can extend the bot s functionality further.

What Other Examples Can I See Introducing a Case with The Trial Act I: The Classical Storytelling Foundation A Photographic Setting Slide Reviewing the Act I Slides for The Trial Reviewing the Call to Action and Key Point Slides for The Trial Keeping on Track with The Plan Writing Act I of the Story Template Researching and Adding Available Graphics for The Plan Reviewing the Act I Slides for The Plan Reviewing the Call to Action and Key Point Slides for The Plan Delivering The Plan Remotely Presenting Results with The Analysis Researching and Adding Available Graphics for The Analysis Reviewing the Act I Slides for The Analysis Reviewing the Call to Action and Key Point Slides for The Analysis Making Information Meaningful with The Report Researching and Adding Available Graphics for The Report Reviewing the Act I Slides for The Report

This section makes available the full source code to the Bot class, bot.rb, including extra documentation that RDoc can use. Also included is the source to a basic bot client that you can use to converse with a bot on a one-on-one basis using the keyboard from the command line. As this code is commented, as opposed to the examples so far in this chapter, I recommend you at least browse through the following code to get a feel for how the entire program operates as a set of parts.

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If you have a class and want to know its base classes, you can access its special attribute _ _bases_ _: >>> SPAMFilter.__bases__ (<class __main__.Filter at 0x171e40>,) >>> Filter.__bases__ () In a similar manner, you can check whether an object is an instance of a class by using isinstance: >>> s = SPAMFilter() >>> isinstance(s, SPAMFilter) True >>> isinstance(s, Filter) True >>> isinstance(s, str) False

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Here s the source code for the main Bot class: