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CHAPTER 22 ■ PROJECT 3: XML FOR ALL OCCASIONS 423 If this does not raise an exception, you’re all set. If it does, you have to install PyXML. First, download the PyXML package from http://sf.net/projects/pyxml. There you can find RPM packages for Linux, binary installers for Windows, and source distributions for other platforms. The RPMs are installed with rpm --install, and the binary Windows distribution is installed simply by executing it. The source distribution is installed through the standard Python installation mechanism, the Distribution Utilities (Distutils). Simply unpack the tar.gz file, change to the unpacked directory, and execute the following: $ python setup.py install You should now be able to use the XML tools. ■Tip There are plenty of XML tools for Python out there. One very interesting alternative to the “standard” PyXML framework is Fredrik Lundh’s ElementTree (and the C implementation, cElementTree), available from http://effbot.org/zone. It’s quite powerful and easy to use, and may well be worth a look if you’re serious about using XML in Python. Preparations Before you can write the program that processes your XML files, you need to design your XML format. What tags do you need, what attributes should they have, and which tags should go where? To find out, let’s first consider what it is you want your XML to describe. The main concepts are Web site, directory, page, name, title, and contents: • Web site. You won’t be storing any information about the Web site itself, so this is just the top-level element enclosing all the files and directories. • Directory. A directory is mainly a container for files and other directories. • Page. This is a single Web page. • Name. Both directories and Web pages need names—these will be used as directory names and file names as they will appear in the file system and the corresponding URLs. • Title. Each Web page should have a title (not the same as its file name). • Contents. Each Web page will also have some contents. You’ll just use plain XHTML to represent the contents here—that way, you can just pass it through to the final Web pages and let the browsers interpret it. In short: your document will consist of a single website element, containing several directory and page elements, each of the directory elements optionally containing more pages and directories. The directory and page elements will have an attribute called name, which will contain their name. In addition, the page tag has a title attribute. The page element contains XHTML code (of the type found inside the XHTML body tag). An example file is shown in Listing 22-1.
424 CHAPTER 22 ■ PROJECT 3: XML FOR ALL OCCASIONS Listing 22-1. A Simple Web Site Represented As an XML File (website.xml) Welcome to My Home Page Hi, there. My name is Mr. Gumby, and this is my home page. Here are some of my interests: Shouting Sleeping Eating Mr. Gumby's Shouting Page ... Mr. Gumby's Sleeping Page ... Mr. Gumby's Eating Page ... First Implementation At this point, we haven’t yet looked at how XML parsing works. The approach we are using here (called SAX) consists of writing a set of event handlers (just like in GUI programming) and then letting an existing XML parser call these handlers as it reads the XML document.
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Beginning Python From Novice to Pro
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For Ranveig
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■CHAPTER 23 Project 4: In the New
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viii ■CONTENTS Strings . . . . .
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About the Technical Reviewer ■JER
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Introduction A C program is like a
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140 CHAPTER 7 ■ MORE ABSTRACTION
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CHAPTER 9 ■ MAGIC METHODS, PROPER
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256 CHAPTER 11 ■ FILES AND STUFF
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270 CHAPTER 12 ■ GRAPHICAL USER I
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298 CHAPTER 14 ■ NETWORK PROGRAMM
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358 CHAPTER 17 ■ EXTENDING PYTHON
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558 APPENDIX B ■ PYTHON REFERENCE
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572 APPENDIX C ■ ONLINE RESOURCES
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Index ■Symbols - operator 558 !=
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■INDEX 581 get method 74-75 has_k
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■INDEX 595 Python C API 365 hand-
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