In this article David Mertz presents the xml_objectify module as part of his ongoing quest to create a more seamless integration between XML and Python. He has described how to use xml_objectify and the advantages of using this "Pythonic" module for working with XML documents as objects.
Although users usually think of Python as a procedural and object-oriented language, it actually contains everything you need for a completely functional approach to programming. This article discusses general concepts of functional programming, and illustrates ways of implementing functional techniques in Python. It starts with the hardest question: "What is functional programming (FP), anyway?" One answer would be to say that FP is what you do when you program in languages like Lisp, Scheme, Haskell, ML, OCAML, Clean, Mercury, or Erlang (or a few others). That is a safe answer, but not one that clarifies very much. Unfortunately, it is hard to get a consistent opinion on just what FP is, even from functional programmers themselves.
This column continues Davids introduction to functional programming (FP) in Python. Enjoy this introduction to different paradigms of program problem-solving, where David demonstrates several intermediate and advanced FP concepts. As suggested, an object is a piece of data with procedures attached to it... A closure is a procedure with a piece of data attached to it.
Along with several other popular scripting languages, Python is an excellent tool for scanning and manipulating textual data. This article summarizes Pythons text processing facilities for the programmer new to Python. The article explains some general concepts of regular expressions and offers advice on when to use (or not use) regular expressions while processing text.
All programmers need to identify parts and structures that exist inside textual documents: log files, configuration files, delimited data, and more free-form (but still semi-structured) report formats. There are many parsing tools that have been written for Python. This article discusses a high-level parsing language built on top of Python. SimpleParse provides an EBNF-style syntax on top of mxTextTools that can greatly clarify the expression of grammars.
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