ASP.NET Web PDF Document Viewer/Editor Control Library

Trick 2: Use Notes Page View to Sync Pictures and Narration Research Reality 2: You Have to Address the Two Channels BBP Addresses the Two Channels The Old Way Addresses Only One Channel Trick 3: Use Normal View to Guide the Eye and Ear Research Reality 3: You Have to Guide Attention BBP Guides Attention The Old Way Does Not Guide Attention A Well-Trained Tool

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read. When you type it into irb it s not necessary to replicate the effect. You can simply type what you see. Once you start using a text editor to write longer programs, you ll want to indent your code to make it easier to read too, but it s not important yet.

First you create the Pet class and define the name, age, gender, and color attributes available to Pet objects. Next, you define the Cat, Dog, and Snake classes that inherit from the Pet class. This means that cat, dog, and snake objects will all have the name, age, gender, and color attributes, but because the functionality of these attributes is inherited from the Pet class, the functionality doesn t have to be created specifically in each class. This makes the code easier to maintain and update if you wanted to store more information about the pets, or if you wanted to add another type of animal. What about attributes that aren t relevant to every animal What if you wanted to store the length of snakes, but didn t want to store the length of dogs or cats Luckily inheritance gives you lots of benefits with no downside. You can still add class-specific code wherever you want. Reenter the Snake class like so:

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The Snake class now has a length attribute. However, this is added to the attributes Snake has inherited from Pet, so Snake has name, age, gender, color, and length attributes, whereas Cat and Dog only have the first four attributes. You can test this, like so (some output lines removed for clarity):

irb(main):001:0> irb(main):002:0> irb(main):003:0> irb(main):004:0> irb(main):005:0> irb(main):006:0> irb(main):007:0> snake = Snake.new snake.name = "Sammy" snake.length = 500 lassie = Dog.new lassie.name = "Lassie" lassie.age = 20 lassie.length = 10

3. You should see several links here, with names such as Python 2.4 and Python 2.4 Windows installer . Click the Windows installer link it should give you the installer file directly. Go to step 5. If you can t find such a link, click the link with the highest version among those with names like Python 2.4. Chances are that this link will be found early on the page. For Python 2.4, you could simply go to the URL http://www. python.org/2.4. 4. Follow the instructions for Windows users. This will entail downloading a file called python-2.4.msi (or something similar), where 2.4 should be the version number of the newest release. 5. Store the Windows Installer file somewhere on your computer, for example, C:\download\python-2.4.msi. (Just create a directory where you can find it later.) 6. Run the downloaded file by double-clicking it in Windows Explorer. This brings up the Python install wizard, which is really easy to use. Just accept the default settings, wait until the install is finished, and you re ready to roll!

Here you created two dogs and a snake. You gave the snake a length of 500, before trying to give one of your dogs a length of 10 (the units aren t important). Trying to give the dog a length results in an error of undefined method 'length=' because you only gave the Snake class the length attribute. Try playing with the other attributes and creating other pets. Try using attributes that don t exist and see what the error messages are.

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