Beginning Python - From Novice to Professional

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CHAPTER 22 ■ PROJECT 3: XML FOR ALL OCCASIONS 429 def endElement(self, name): if name == 'page': self.passthrough = False self.out.write('\n\n') self.out.close() elif self.passthrough: self.out.write('' % name) def characters(self, chars): if self.passthrough: self.out.write(chars) parse('website.xml', PageMaker ()) You should execute this in the directory in which you want your files to appear. Note that even if two pages are in two different directory elements, they will end up in the same real directory. (That will be fixed in our second implementation.) Again, using the file website.xml from Listing 22-1, you get four HTML files. The file called index.html contains the following: Home Page 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 Figure 22-1 shows how this page looks when viewed in a browser. Looking at the code, two main weaknesses should be obvious: • I use if statements to handle the various event types. If I need to handle many such event types, my if statements will get large and unreadable. • The HTML code is hard-wired. It should be easy to replace. Both of these weaknesses will be addressed in the second implementation.
430 CHAPTER 22 ■ PROJECT 3: XML FOR ALL OCCASIONS Figure 22-1. A generated Web page Second Implementation Because the SAX mechanism is so low-level and basic, you may often find it useful to write a mix-in class that handles some administrative details such as gathering character data, managing Boolean state variables (such as passthrough), or dispatching the events to your own custom event handlers. The state and data handling is pretty simple in this project, so let’s focus on the handler dispatch. A Dispatcher Mix-In Class Rather than having to write large if statements in the standard generic event handlers (such as startElement), it would be nice to just write your own specific ones (such as startPage) and have them called automatically. You can implement that functionality in a mix-in class, and then subclass the mix-in along with ContentHandler. ■Note As mentioned in Chapter 7, a mix-in is a class with limited functionality that is meant to be subclassed along with some other more substantial class. You want the following functionality in your program: When startElement is called with a name such as 'foo', it should attempt to find an event handler called startFoo and call it with the given attributes. Similarly, if endElement is called with 'foo', it should try to call endFoo. If, in any of these methods, the given handler is not found, a method called defaultStart (or defaultEnd, respectively) will be called, if present. If the default handler isn’t present either, nothing should be done.
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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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x ■CONTENTS ■CHAPTER 5 Conditio
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xxii ■CONTENTS Preparations . . .
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About the Technical Reviewer ■JER
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Introduction A C program is like a
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CHAPTER 1 ■ ■ ■ Instant Hacki
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82 CHAPTER 5 ■ CONDITIONALS, LOOP
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110 CHAPTER 6 ■ ABSTRACTION But w
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140 CHAPTER 7 ■ MORE ABSTRACTION
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160 CHAPTER 8 ■ EXCEPTIONS >>> im
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CHAPTER 9 ■ ■ ■ Magic Methods
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CHAPTER 9 ■ MAGIC METHODS, PROPER
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CHAPTER 10 ■ ■ ■ Batteries In
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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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314 CHAPTER 15 ■ PYTHON AND THE W
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358 CHAPTER 17 ■ EXTENDING PYTHON
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500 CHAPTER 27 ■ PROJECT 8: FILE
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APPENDIX A ■ ■ ■ The Short Ve
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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 579 cmd module 252, 501 Cm
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■INDEX 581 get method 74-75 has_k
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■INDEX 583 ■F Factory class twi
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■INDEX 585 finding conflicts 197
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■INDEX 589 localtime function tim
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■INDEX 595 Python C API 365 hand-
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