.NET/ASP.NET/C#/VB.NET PDF Document SDK

If you want to write a really long string, one that spans several lines, you can use triple quotes instead of ordinary quotes: print '''This is a very long string. It continues here. And it's not over yet. "Hello, world!" Still here.''' You can also use triple double quotes, """like this""". Note that because of the distinctive enclosing quotes, both single and double quotes are allowed inside, without being backslashescaped.

You caused an error!

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In this case, begin and end define a section of code to be run, where if an exception arises, it s handled with the code inside the rescue block. First, you try to work out ten divided by zero, which raises an exception of class ZeroDivisionError. However, being inside a block containing a rescue section means that the exception is handled by the code inside that rescue section. Rather than dying with a ZeroDivisionError, the text You caused an error! is instead printed to the screen. This can become important in programs that rely on external sources of data. Consider this pseudo-code:

of the action. Transitioning from the preceding photograph with a heavy black outline of Bob, shown on the upper left in Figure 9-3, Mark now deputized the jurors as crime scene detectives in the Role slide (upper right) with the simple phrase CSI: Angleton illustrating the hidden headline You get to be like CSI detectives and follow the evidence. Mark knew that this technique would connect with his audience because many of the jurors had indicated in their written questionnaires that the popular CSI television show was one of their favorites. Even if all of the jurors had not seen CSI, they would know its premise because of the show s broad market awareness. As you write and illustrate your own Role headline, consider what words and images you can use to instantly place your audience at the center of the action in an effective way like this.

data = "" begin <.. code to retrieve the contents of a Web page..> data = <..content of Web page..> rescue puts "The Web page could not be loaded! Using default data instead."

This code demonstrates why handling exceptions is extremely useful. If retrieving the contents of a Web page fails (if you re not connected to the Internet, for example), then the error handling routine rescues the exception, alerts the user of an error, and then loads up some data from a local file instead. Certainly better than exiting the program immediately! In the previous section we looked at how to create your own exception classes, and the motivation for doing this is that it s possible to rescue different types of exceptions in a different way. For example, you might want to react differently if there s a fatal flaw in the code, versus a simple error such as a lack of network connectivity. There might also be errors you want to ignore, and only specific exceptions you wish to handle. rescue s syntax makes handling different exceptions in different ways easy:

In keeping with the classical storytelling form described in 4, Mark s next step was to present the main characters with a challenge they face on the Point A slide. In this case, Mark de ned the jurors challenge in the hidden headline, The evidence will lead you to the pharmaceutical company, illustrated with an of ce building similar to the one shown on the lower left. In screenwriting terms, this introduced the challenge that is built into your Point A headline an obstacle or an event that confronts the main character and begins the action that drives the story forward. In this case, Mark de ned the obstacle as the evidence these CSI detectives would now need to follow. But for the problem to be fully de ned, Mark needed to provide the jurors with a second crucial element Point B, or where the jurors wanted to be, which is de ned in the story template with the headline You d like to bring justice to the situation. The image of a gavel (lower right) along with Mark s narration reinforced the problem the jurors faced: they