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For many people, one of the most important pieces of computer software is a word processor. Although I am using one to write this book (OpenOffice.org Writer), it s not something I use often. The last time I used a word processor was four years ago when I wrote my previous book. A text editor, on the other hand, is an indispensable tool. I use one for writing e-mail, Usenet articles, shell scripts, PostScript programs, web pages, and more. A text editor operates on plain-text files. It stores only the characters you type; it doesn t add any hidden formatting codes. If I type A and press Enter in a text editor and save it, the file will contain exactly two characters: A and a newline. A word-processor file containing the same text would be thousands of times larger. (With abiword, the file contains 2,526 bytes; the OpenOffice.org file contains 8,192 bytes.)

Single-step debugging allows you to execute your code one line at a time. It s incredibly easy to use. Just follow these steps: 1. Find a location in your code where you want to pause execution, and start single-stepping (you can use any executable line of code but not a variable declaration, comment, or blank line). Click in the margin next to the line code, and a red breakpoint will appear (see Figure 2-22).

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Figure 2-22. Setting a breakpoint 2. Now start your program as you would ordinarily. When the program reaches your breakpoint, execution will pause, and you ll be switched back to the Visual Studio code window. The breakpoint statement won t be executed. 3. At this point, you have several options. You can execute the current line by pressing F11. The following line in your code will be highlighted with a yellow arrow, indicating that this is the next line that will be executed. You can continue like this through your program, running one line at a time by pressing F11 and following the code s path of execution. Or, you can exit break mode and resume running your code by pressing F5.

In Python, variables are assigned to namespaces, where they can later be retrieved by name, making template contexts very similar. There are also some notable differences that may cause some confusion. Python allows namespaces to be nested, but only inside a defined class or function. In these nested namespaces, new variables aren t accessible to the other namespaces that enclose them. Other types of code blocks, such as conditionals and loops, share the namespace with whatever code surrounds them, so new variable assignments persist after the block finishes executing. This works well because namespaces are based on where the code is written, rather than where it executes, so the programmer can easily make sure that there aren t any conflicts with related names. When writing a template tag, there is no way of knowing what variables will be defined in the template where the tag gets used. If it adds any new variables to the context, those could very well overwrite something else that was already set in the template. To overcome this, templates offer and methods to allow tags to manually create a new nesting level and remove it when finished with it. This makes templates work a bit differently from Python code in this respect, since blocks like loops essentially create a new namespace for the duration of their execution, removing it when finished. These differences may be a bit confusing at first to programmers, but designers working just with templates will only have one behavior to get used to.

The design-time representation of your content pages can range from excellent to poor. For the simple header and footer example, you ll see a fairly good representation of your content page that includes all the elements of the master page and the additional content you ve added. The parts you ve acquired from the master page will be shaded in gray, indicating you can t select or change them in any way. Instead, you ll be limited to inserting comments into the ContentPlaceHolder region, as shown in Figure 15-12.

If a master page defines a ContentPlaceHolder but your content page doesn t define a corresponding Content control, you ll see a black box in its place. To add the required Content control, right-click that section of the page and choose Create Custom Content.

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