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public manner, allowing them to be extended and worked upon by any competent programmer. In many cases this makes it possible for other developers to fork the project (taking the existing code and splitting it into their own version), but in practice this is rare.

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A classic technique in oral presentations is to show a physical prop and explain how the object relates to the presentation. The CTA+3 slides are a good place to integrate a prop, especially when you tie in that prop with your motif. For example, hold up a numbered puzzle piece when you present each Key Point slide to carry through a puzzle motif. Or better yet, pass out to your audience their own numbered puzzle pieces they can hold they will literally carry the main message of the presentation out of the room in their hands, and undoubtedly in their long-term memories too. If you plan to use a physical prop, sketch a photograph of it on the CTA+3 slides during the presentation, you ll show the photo of the prop on the screen while you display the prop physically in the room.

>>> it = d.iteritems() >>> it <dictionary-iterator object at 169050> >>> list(it) # Convert the iterator to a list [('url', 'http://www.python.org'), ('spam', 0), ('title', 'Python Web Site')] Using iteritems may be more efficient in many cases (especially if you want to iterate over the result). For more information on iterators, see 9.

In developing Ruby, Matz was heavily influenced by the programming languages he was already familiar with. Larry Wall, the developer of the popular Perl language, was a hero of Matz s, and Perl s principle of There s More Than One Way To Do It is present in Ruby. Some languages, such as Python, prefer to provide more rigid structures and to present a clean method for developers to have a small number of options to perform a certain task. Ruby allows its developers to solve problems in any one of many ways. This allows the language great flexibility, and combined with the object-oriented nature of the language, Ruby is extremely customizable. In terms of its object-oriented nature, Ruby has also been heavily influenced by Smalltalk, a prolific object-oriented language developed in the 1970s. As in Smalltalk, almost everything in Ruby is an object, and Ruby also gives programmers the ability to change many details of the language s operation within their own programs on the fly. This feature is called reflection. To a lesser extent, Python, LISP, Eiffel, ADA, and C++ have also influenced Ruby. These influences demonstrate that Ruby isn t a language that s afraid to take on the best ideas from other languages. This is one of many reasons why Ruby is such a powerful and dynamic language. The implementation of many of these features has also made the migration from other languages to Ruby significantly easier. Learning Ruby means, to a great extent, learning the best features of other programming languages for free. (Refer to Appendix A for a comparison between Ruby and other languages.)

As a language initially developed for Matz s own use in Japan, the initial documentation was entirely in Japanese, locking most non-Japanese users out. Although it s customary for programming languages to use English for their keywords (such as print, puts, if, and so on) it wasn t until 1997 that the initial English documentation began to be produced. Matz first began to officially promote the Ruby language in English in late 1998 with the creation of the ruby-talk mailing list, still one of the best places to discuss the Ruby language, as well as a useful resource with more than 200,000 messages archived at the list s Web site (http://blade.nagaokaut.ac.jp/ruby/ruby-talk/index.shtml).