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Copyright Charles F. Goldfarb Series on Open Information Management The Charles F. Goldfarb Series on Open Information Management Foreword Introduction Purpose of This Book The Pyxie Open Source Project Prerequisites How to Read This Book A Note about Platforms Structure of Code Samples And Finally . . . Installing Python Getting a Python Distribution Installing the Software Testing the Python Installation Using a Python Program File In Conclusion Installing the XML Package Testing the XML Package Installation Testing the pyExpat Module Testing SAX Support Tools of the Trade The XMLN and XMLV Parsing Utilities Simple XML-Processing Tasks with XMLN and XMLV The GetURL Utility—A Web Resource Retriever in Python The PYX2XML Utility: Converting PYX to XML The C3 Utility: An XML Document Editor/Viewer in Python In Conclusion Just Enough Python Introduction Basic Control Structures Functions Modules Data Structures Object Orientation Design Principles In Conclusion Some Important Details Dealing with Long Lines Using the dir Function Working with Docstrings Importing Modules Executing Python Programs Using the Special Object None Memory Management Copying Objects Determining Object Identity Handling Errors The Dynamic Nature of Python Named Parameters The Pass Statement Packages Processing XML with Regular Expressions Command-Line Arguments A Module Test Harness for xgrep What If There Are No Command-Line Parameters? Adding Support for Wildcards Parsing Command-Line Options A Pattern-Matching Dry Run Introducing Regular Expressions Using Escape Sequences in Regular Expressions Compiling Regular Expressions Adding Regular Expressions to xgrep xgrep in Action Parsing XML with Regular Expressions Cautionary Tales Avoiding False Positive Matches Shallow Parsing XML with Python Regular Expressions Current Implementation of xgrep Event-driven XML Processing Making xgrep XML-Aware Invoking xmln from xgrep Adding PYX Support for xgrep Adding XML Search Features to xgrep Using Long Option Names in getopt Using “Bit Twiddling” to Handle the Many Options Available The Match Printing Function Some Examples Generalizing the Idea of Event-Based XML Processing A Standardized Event-Driven Processing Model Advantages and Disadvantages of Event-Driven Processing In Conclusion Tree-driven XML Processing Modelling a Node Navigating a Tree Building xTree Structures Building an xTree By Using PYX A Test Harness for Pyxie Handling Line Ends A Syntax for Tree Processing with xgrep Adding Support for Attributes Some Utility Bits and Pieces Implementing XMLGrepTree A Standardized Tree-Driven XML Processing Model Advantages and Disadvantages of Tree-Driven XML Processing Some Examples Bringing It All Together Just Enough SAX History The Concept of an “Interface” Overview of the SAX Specification The HandlerBase Class The DocumentHandler Interface The AttributeList Interface The ErrorHandler Interface A SAX Inspection Application SAX as a Source of PYX Switching SAX Parsers Just Enough DOM History DOM Support in Python The DOM Architecture Accessing an XML File with pyDOM Navigating a DOM Tree Walking a DOM Tree Accessing Attributes Manipulating Trees Accessing an HTML File with pyDOM Printing the Text of an HTML Document Changing Data Content in a DOM Tree Creating a Tree Programmatically Converting HTML to PYX by Using DOM Using PYX as a DOM Data Source Pyxie: An Open Source XML-Processing Library for Python What Is Pyxie? Design Goals PYX Notation Processing Event-driven Processing Tree-driven Processing Tree Navigation Tree Cut-and-Paste Node Lists Tree Walking Hybrid Event- or Tree-driven Processing The Invoice Printing Problem Solved Three Ways The Complete Source Code for the Pyxie Library xFS: Filesystem Information in XML A Simple XML DTD for Filesystem Information Some Python Features Used in the xFS Application Viewing xFS Data with the C3 XML Editor/Viewer Performing Filesystem Queries with xgrep Source Code for xFS xMail: E-mail as XML The rfc822 Module A Simple DTD for E-mail An Example of an E-mail Message in XML Processing a Eudora Mailbox Processing a Linux Mailbox Processing an E-mail Message by Using the rfc822 Module Sending E-mail by Using xMail Source Code for the SendxMail Application Source Code for the xMail Application xMySQL: Relational Database Harvesting with Python SAX Installing MySQL Testing the MySQL Installation Installing the Python Interface to MySQL Testing the Python Interface to MySQL Mapping Relational Data to XML The Python SAX Driver Interface Implementing a SAX Driver for MySQL A Template for SAX Drivers The MySQL SAX Driver Some Examples xTract: A Query-By-Example XML Retrieval System Expressing XML Queries The xTract.py Utility in Action xTract Version 1 Source Code Handling Large XML Files with xTract Source Code for the xTract1 Utility The C3 XML Editor/Viewer Developing wxPython Applications A “Hello World” wxPython Application Converting an xTree to a wxTree, and Vice Versa Dynamic Module Loading The Complete Source Code for C3 An Overview of Python for Java Programmers Comparing the Python and Java Programming Languages An Overview of Python for Perl Programmers About the CD-ROM Windows Linux Generic Unix Miscellaneous Technical Support
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