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Before you can start programming, you need some new software. What follows is a short description of how to download and install Python. If you want to jump into the installation process without detailed guidance, you could simply visit http://www.python.org/download to get the most recent version of Python.

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Ruby was initially designed for use under Unix and Unix-related operating systems such as Linux, but Windows users have access to an excellent one-click installer, which installs Ruby, a horde of extensions, a source code editor, and various documentation, in one click. Ruby on Windows is as reliable and useful as it is on other operating systems, and Windows makes a good environment for developing Ruby programs. To get up and running as quickly as possible, follow these steps: 1. Open a Web browser and go to http://www.ruby-lang.org/en/downloads/. 2. Scroll down to Ruby on Windows, about halfway down the page.

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3 In the Ruby on Windows section, you ll see a few links for different versions of Ruby you can download for Windows Ideally you want to download the file at the link that s highest in the list that s referred to as a One-Click Installer At the time of writing, this is version 185 4 Click the link you found in step 3 and save it to your desktop 5 Once download has completed, look on your desktop for the Ruby EXE file you just downloaded, and double-click it to load the installer 6 If Windows gives you a Security Error box, click the Run button to give your approval 7 A typical installation program appears with some instructions On the initial screen, click Next 8 Work your way through the installation screens.

Leave the boxes checked to install the text editors SciTE and FreeRIDE, and the Ruby package manager RubyGems (more on that in 7) Unless you have a specific reason not to, let the installation program install Ruby in its default location of c:\ruby and its default program group 9 Installation takes place when you see a stream of filenames flying up your screen Wait several minutes for the installation process to complete and enjoy the view There are a lot of files to install! 10 Installation is complete when the installation program says Installation Complete and the Next button is clickable Click the Next button, then click Finish to exit the installation program If Ruby installed correctly, congratulations! Go to the Start menu and then the Programs or All Programs menu.

Three Bedrock Tools of PowerPoint Trick 1: Use Slide Sorter View to Manage the Volume In Search of Research Reality Research Reality 1: You Have to Respect the Limits of Working Memory BBP Respects the Limits of Working Memory The Old Way Ignores the Limits of Working Memory

There should be a Ruby program group that contains icons for FreeRIDE, SciTE, an uninstaller, and other bits and pieces To test that your Ruby installation works correctly for 2, you need to load the program listed as fxri Interactive Ruby Help & Console, so click this entry and wait for the program to load If the program loads successfully, you ll see a screen that looks somewhat like that in Figure 1-1..

To install Python on a Windows machine, follow these steps: 1. Open a Web browser and go to http://www.python.org. 2. Click the Download link.

Now that we ve come up with some ideas to improve our code, let s retype it from scratch. To totally cleanse out and reset what you re working on, you can restart irb. irb doesn t remember information between the different times you use it. So restart irb (to exit irb, type exit and press Enter) and rewrite the class definitions like so:

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class Pet attr_accessor :name, :age, :gender, :color end class Cat < Pet end class Dog < Pet end class Snake < Pet end

Note In the code listings in this chapter, any code that s within classes is indented, as with the attr_ accessor line in the preceding Pet class. This is only a matter of style, and it makes the code easier to

1. Hacking is not the same as cracking, which is a term describing computer crime. The two are often confused. Hacking basically means having fun while programming. For more information, see Eric Raymond s article How to Become a Hacker at http://www.catb.org/~esr/faqs/hacker-howto.html.