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Figure 10-1. An example of polymorphic command use with different objects Although the three geometric shapes in Figure 10-1 are different objects, using the same command, you can communicate what you want each object to do, and the object knows how to do it. The polymorphic use of commands or messages reduces the use of synonyms in a programming language. If you re a writer, synonyms are wonderful things. They allow you to use words that have similar meanings but sound different, so that your resulting prose can have a somewhat rhythmic cadence. It can sound beautiful. If you re a programmer, synonyms are awful things. They cause ambiguity because you can t know from the sound of the synonym if it means something similar (LIKE) or if it means exactly the same thing (=). And in programming, ambiguity is a really bad thing. Furthermore, synonyms expand the size of a language and make it harder to learn and use. The harder the language is to use, the more defects will be created when using it, and that too is bad.

Best Practice Use the description element, which allows you to enter a detailed description of the project. This description is shown on the console when invoking Ant with the -projecthelp or -p command-line option.

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Let s go back to Figure 10-1 for a second. I could have named the command to draw each geometric shape in the figure draw_square(), draw_triangle(), and draw_circle(). That s the procedural programming paradigm. But by doing so, I would have made the programming language three times larger than when I simply used the same command, draw(), in the context of the object to which it belongs. Even if you re not using an object-oriented language, you can still use an object-oriented approach by employing modularity and polymorphism. Employing modularity means abstracting large program units into smaller components that can then be reused and assembled to accomplish a larger purpose. Employing polymorphism means abstracting out a set of commands that communicate the same action; however, the action taken will be appropriate for the object executing the command. And that s what I m going to cover in this chapter, by doing the following: Show you a list of polymorphic commands that I have used repeatedly, project after project, always with the same meaning and to take the same action, but an action appropriate to each object. Tell you a handful of stories, or fairy tales, in which I use each polymorphic command, so you ll have some real-world examples to draw from when you employ polymorphism in your next project. Leave you with some advice about what you should do next. I ll get you jump-started with a list of time-tempered polymorphic commands.

The interactive Python interpreter can be used as a powerful calculator. Try the following: >>> 2 + 2 This ought to give you the answer 4. That wasn t too hard. Well, what about this: >>> 53672 + 235253 288925 Still not impressed Admittedly, this is pretty standard stuff. (I ll assume that you ve used a calculator enough to know the difference between 1+2*3 and (1+2)*3.) All the usual arithmetic operators work as expected almost. There is one potential trap here, and that is integer division (in Python versions prior to 3.0, which may not come out for quite a while): >>> 1/2 0 What happened here One integer (a nonfractional number) was divided by another, and the result was rounded down to give an integer result. This behavior can be useful at times, but often (if not most of the time), you need ordinary division. What do you do to get that There are two possible solutions: You use real numbers (numbers with decimal points) rather than integers, or you can tell Python to change how division works. Real numbers are called floats (or floating-point numbers) in Python if either one of the numbers in a division is a float, the result will be, too: >>> 1.0 / 2.0 0.5 >>> 1/2.0 0.5

Anytime you write or rewrite a program or application, you have an opportunity to abstract out patterns of use that you have experienced beforehand, and employ that experience as the intelligent and wise use of object-orientation As I ve already stated several times, you do not need to be using an object-oriented language in order to employ object-orientation Earlier in this book, I introduced you to the idea of creating a table package for every table Each table package contains any executable behavior that belongs to the data held in the table in question Then, in 6, I showed you how to create an object table, based on a new object TYPE, which contains any executable behavior that belongs to its associated object attributes.

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