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You should now be able to run Python. On occasion, you may run into some unresolved dependencies you may lack other RPM packages needed to install Python. To locate these packages, visit a search facility such as http://www.rpmfind.net. Sometimes a binary RPM package designed for one Linux distribution (for example, Red Hat Linux) may not work smoothly with another (for example, Mandrake Linux). If you find that the binary package is giving you grief, try downloading a source RPM instead (with a name like packagename.src.rpm). You can then build a set of binary packages tailored for your system with the command rpm --rebuild packagename.src.rpm

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63 female {"name"=>"Janet S Porter", "gender"=>"female", "age"=>55}

each person. These sorts of structures are common in Ruby (as well as in Perl and C++). They are covered in more depth in 3 and throughout this book. Typically, compared to other languages, the syntax is simple, and in Ruby, the simplest answer is usually the right one.

the story template in the form of your Act I and Act II Key Point column headlines. If you want to let other people know the structure of your talk in advance, you can summarize it in the same way in an e-mail message. In all of these situations, your story template can keep you speeding along with effective communication.

Ruby has powerful Input/Output (I/O) support, from the ability to create, read, and manipulate files through to database support, external devices, and network

connectivity. These topics are covered in full in this book (primarily in s 9, 14, and 15), but this section presents a basic overview of the most important forms of I/O.

where packagename.src.rpm is the real file name of the package you re rebuilding. After you have done this, you should have a brand-new set of RPM files that you can install as described previously.

There are many reasons why the ancient concept of hierarchy still holds such power today. Some researchers believe that the mind uses hierarchical structures to store information in and retrieve information from long-term memory. For example, the idea of chunking is based on the idea that long-term memory applies a higher category to smaller pieces in working memory to bring them together and make them easier to handle. Some experts believe that a part of the brain called the neocortex retrieves information in a hierarchical way. And certainly the organizational technique of hierarchy is fully a part of most outlining systems, as well as many computer languages. When you write your Act II headlines, you tap into hierarchical power by bringing the structure itself from long-term memory and applying it to the organization of your slides, as shown in Figure 5-30. A hierarchy turns out to be a deep and memorable way to help you and your audiences get right to the heart of the matter.

Ruby s support for file I/O is powerful compared to that of other languages. Although Ruby supports traditional techniques for reading and manipulating files, its objectoriented features and tight syntax offer more exciting possibilities. First, here is the traditional way you d open and read a file (as when using a more procedural language):

lines = [] file_handle = File.new("/file/name/here", "r") while line = file_handle.gets lines << line end

1 2 3

This example opens a file in read-only mode, then uses the file handle to read the file line by line before pushing it into an array. This is a reasonably standard technique in, say, C or Pascal. Let s look at a Ruby-specific technique:

Note To use the RPM installation, you must be logged in as root (the administrator account). If you don t

lines = File.readlines('/file/name/here')

FIGURE 5-30 Applying a familiar hierarchical structure from long-term memory to your slides helps make them easier to prioritize and put in a proper sequence.

Ruby s file handling and manipulation support is particularly deep and extensive, so is out of the scope of this chapter. However, the preceding examples should have provided a glimpse into what s possible, and files are covered in full in 9 of this book.