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Ruby is considered a pure object-oriented language, because everything appears, to Ruby, as an object. An earlier example in this appendix demonstrated this:

Note If you don t want to mess with environment variables, you can simply specify the full path of the Python interpreter. In Windows, you might do something like this:

Even literal data within code is considered to be an object, and you can call the methods made available by those objects (and/or their parent classes).

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Mark clicked the remote button to show the next slide, a photograph of a gavel and ag, similar to Figure 1-9, as he said, You re going to hear all of this evidence because...your job to do is to get us to justice...Nobody else has this power. A judge can t do it...Politicians can t do it. Nobody else can do it. This is where you can make a difference in the world. The image of the gavel along with Mark s narration reinforced the problem the jurors faced: they will see the evidence against the company, but now they will have to sort through it and bring the situation to justice. You ll learn how to create dramatic tension in your presentations in 3, when you plan the two speci c slides that present your audience with an unresolved problem that your presentation will help them to solve.

Note Object orientation, classes, objects, methods, and their respective techniques are covered in full in

Ruby implements object orientation in a simple way (syntax-wise), but offers more dynamic features than other major languages (see 6 for many examples of such features).

FIGURE 1-9 With a gavel and flag displayed on screen, Mark explained that the jurors could bring the situation to justice.

Sometimes you want to execute a Python program (also called a script) the same way you execute other programs (such as your Web browser, or your text editor), rather than explicitly using the Python interpreter. In UNIX, there is a standard way of doing this: have the first line of your script begin with the character sequence #! (called pound bang or shebang) followed by the absolute path to the program that interprets the script (in our case Python). Even if you didn t quite understand that, just put the following in the first line of your script if you want it to run easily on UNIX: #!/usr/bin/env python This should run the script, regardless of where the Python binary is located.

Objects in Ruby have no special qualities beyond objects that exist in any other objectoriented programming language. However, the key difference between Ruby and most other major object-oriented languages is that in Ruby everything is an object. With this in mind, you can call methods on almost everything, and even chain methods together. In C or Perl it would be common practice to write code in this form:

function1(function2(function3(something)))

Next, as Mark began to click through a sequence of images similar to those shown in Figure 1-10, he said, How are you going to do it My suggestion to you is, again, you ve got to follow the evidence. This statement and the images Mark displayed clearly de ned the story thread that would pull the entire presentation forward and focus every piece of information to come. You ll learn more about story threads and how to choose one for your next presentation in s 3 and 4.

However, in Ruby you d do this:

Periods are used between an object and the method to call, as in C++ or Java (as opposed to -> used in Perl). In this example, you call the function3 method upon the something object, then the function2 method upon the result of that, and then the function1 method on the result of that. A real-world demonstration can illustrate: