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You should now be able to verify that Django installed correctly on your computer. Next, start the interactive Python interpreter and type in the following: >>> import django >>> print django.VERSION Running these commands should display a set of numbers in parentheses, which represents the version of Django you re using. The Django 1.1 release, for example, will show (1, 1, 0, final , 0). Python software typically uses a version tuple a parenthesized, commaseparated list of numbers and/or words to represent version numbers internally, and Django is no different. (This version tuple makes it easy for Python programs to automatically parse otherwise complex version numbers such as 1.0 beta 3 or 2.4 prerelease. ) Now you re ready to create your first Django project. A Django project is a wrapper of sorts, which contains a list of one or more Django-powered applications and the settings they use. Later on, when you re deploying your Django applications behind a real web server, you ll use projects to configure them. To set up your first project, create a directory on your computer where you ll keep your in-progress Django projects, and then navigate to it using a terminal or a command prompt. It s often a good idea to have a single directory where you keep all of your own custom Python code, so choose a single logical place on your computer for this. As you ll see a bit later, doing so will simplify the process of telling Python how to find and use that code.

In C, passing a pointer to a function provides that function with a reference, or memory address, to the data being passed. The called function can then access the data at (or dereference) that pointer to read the value stored at it and then change that value. If the parameter is passed by value, the called function cannot change it. By passing a reference to the command-line options, GTK will remove the options it recognizes from the list. The syntax to do this uses the ampersand operator, which returns the address of the given argument: gtk_init(&argc, &argv);

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Your application will be in the GTK+ main loop for the life of the process. The main loop is an infinite loop that repeatedly retrieves input from the keyboard, mouse, and possibly other devices; updates the display; and processes events such as a button was clicked, through a system of signals and callback functions I will discuss later this chapter. From main(), simply call gtk_main(). This argument takes no parameters and will not return until gtk_main_quit() is called elsewhere in your code. The shortest valid GTK+ application you can write consists of only these two function calls: #include <gtk/gtk.h> int main(int argc, char *argv[]) { gtk_init(&argc, &argv); gtk_main() return 0; } This application will not do anything; it will be stuck in gtk_main() forever. A practical main() function will create the application s initial UI between the calls to gtk_init() and gtk_main(). I will return to this example later this chapter when I demonstrate how to build a UI. As mentioned earlier, GTK+ s main loop is actually part of GLib that provides several useful functions for interacting with it. Gaim uses these functions intensively for

Tools and methods for identifying and resolving performance issues may be categorized at the database, server, application tier, and user levels. The Applications DBA will need to be familiar with all of these tools. The tools available will vary, depending upon the versions of the database and application installed.

o far, this book has mostly been concerned with covering various aspects of Django in the context of building a set of specific applications Through the process of writing the code for those applications, you ve seen Django s major components in action and learned how they can drastically reduce the amount of work needed to build useful web applications But that s really just a small part of what Django can do to help you cut down on development time and effort By encouraging certain best practices and by making it easier to follow them as you write, Django also helps you improve the quality, flexibility, and reusability of your code And in the long run, that s a much larger gain.

communicating on the network. This will be discussed in 7. Another useful function of GLib s main loop is timeouts. Oftentimes it s useful in an application to do something after waiting a certain amount of time. GLib provides a callback mechanism to do this. Calling g_timeout_add(guint interval, GSourceFunc function, void *data); will call function after interval microseconds. The callback function can return TRUE to specify that the callback should recur, or FALSE if the timeout should be removed. I will discuss the concept of callbacks in more detail later in this chapter.

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