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Drools is an open source rules-engine implementation based on the Rete algorithm. Drools is designed to allow pluggable rules language implementations. Rules can be written in the Java language, Python, and Groovy.
Downloads 16 Dec 2005
Discover Python, Part 7: Explore the Python type hierarchy
This article returns to the exploration of the Python type hierarchy and introduces the Python dictionary container type. Unlike the Python tuple, string, and list container types discussed in previous articles, the dictionary type is an unordered container that relies on a key-to-value mapping. As a result, items in a dictionary are accessed by a key value and not by their location within a sequence. The unique features of the dictionary type may seem unusual, but they provide a great deal of power when used properly.
Articles 06 Dec 2005
Discover Python, Part 6: Programming in Python
This article explores the Python for loop. The for loop is used to iterate through the items in a Python collection, including the Python tuple, string, and list container types discussed in previous "Discover Python" articles. The for loop can also be used to access elements from a container type by using the range (or xrange) method. In addition, you can use the range method to execute a group of statements a specific number of times within a for loop.
Articles 25 Oct 2005
Discover Python, Part 5: Programming in Python
This article begins to demonstrate how to do things in Python by focusing on flow control, which is one of the simplest methods for writing programs. In this programming model, data is manipulated -- perhaps from a user interface, sensors, or a file; depending on the value of the data or resulting expressions, different actions are taken. Python provides several flow control mechanisms. This article discusses the if statement, and the while and for loops.
Articles 20 Sep 2005
Discover Python, Part 4: Explore the Python type hierarchy
Python provides a number of useful features, of which the list class is one of the most important. This article introduces the list class and demonstrates some of the many ways in which you can use it to simplify difficult programming tasks.
Articles 30 Aug 2005
Thinking XML: Serving up WordNet as XML
A few articles back, Uche Ogbuji discussed WordNet 2.0, a Princeton University project that aims to build a database of English words and lexical relationships between them. He showed how to extract XML serializations from the word database. In this article he continues the exploration, demonstrating code to serve up these WordNet/XML documents over Web protocols and showing you how to access these from XSLT.
Articles 30 Aug 2005
Discover Python, Part 3: Explore the Python type hierarchy
Unlike many other programming languages, the Python language does not include a special data type to handle a single character, such as "a" or "z." In contrast, Python takes a different approach: It uses a class designed especially for holding sequences of characters. This article introduces the string class and demonstrates different ways in which you can use a string within Python.
Articles 02 Aug 2005
Discover Python, Part 2: Explore the Python type hierarchy
The Python programming language is a simple yet powerful language. This article explores the object nature of the language, initially for the built-in simple types. The Python tuple class is also introduced and used to demonstrate the concept of a container type.
Articles 31 May 2005
Connect to Apache Derby databases using Python
Using Python to manipulate Derby databases allows us to quickly and easily explore, learn, and prototype relational database applications.
Articles 19 May 2005
Discover Python, Part 1: Python's built-in numerical types
The flexible nature of the Python programming language supports multiple programming philosophies, including procedural, object-oriented, and functional. But most importantly, programming in Python is fun. The language supports rather than hinders the development process. This article, the first in a series on Python programming, introduces Python and its built-in numerical types.
Articles 03 May 2005
MySQL for Linux on POWER, Part 2: Developing applications
In this second, and final, part of this series, learn more about the availability of MySQL Database Server for Linux(TM) running on IBM(R) POWER(TM) and PowerPC(R) processor-based servers (collectively referred to as Linux on POWER). Part 2 focuses on developing applications for MySQL in some of the major programming languages, such as PHP, Java(TM), C/C++, Python, and Perl. As a brief guide for application developers using MySQL on Linux on POWER, this paper is intended for MySQL developers and database administrators who are familiar with their system environment, networks, media devices, and disk resources.
Articles 07 Apr 2005
MySQL for Linux on POWER, Part 1: Introduction to creating a database
Learn about the availability of MySQL Database Server for Linux(R) running on IBM(R) POWER(TM) and PowerPC(R) processor-based servers (collectively referred to as Linux on POWER). As a brief guide for application developers using MySQL on Linux on POWER, this paper is intended for MySQL developers and database administrators who are familiar with their system environment, networks, media devices, and disk resources. In Part 2 of this article, read about developing applications for MySQL using PHP, C/C++, Java, Perl, and Python.
Articles 05 Apr 2005
Customizing WebSphere Studio to use the Struts Scripting tool with ActionClasses in Jython
This article describes how to set up WebSphere Studio Application Developer V5.1.2 (hereafter called Application Developer) to use the Struts Scripting tool to implement ActionClasses in Jython. Developing Struts actions using a scripting language gives you a faster write-and-test cycle and lets you reuse existing Jython/Python scripts without translating them into Java. Choosing Jython as your scripting language lets you easily interact with Java and use the Struts framework classes. The configuration, however, is a bit tricky, because it is based on the Bean Scripting Framework, the Struts scripting tool, and Jython. This article provides a step-by-step guide to customize the environment. You should have some experience with WebSphere Studio, Struts, and Jython or Python.
Articles 30 Mar 2005
Welcome to the Open source zone
IBM is launching a revamped developerWorks Open source zone, which will deliver more articles, resources, tools, and tutorials that support major industry open source initiatives, including Linux, Apache, Derby, Globus, and Eclipse. Learn how you can benefit.
Articles 25 Feb 2005
Connect to Apache Derby databases using Jython
Using Jython to manipulate Derby databases allows us to quickly and easily explore, learn, and proptotype relational database applications.
Articles 17 Feb 2005
Gnosis Utilities is a Python package with a variety of utility classes for data management that transform data in XML documents into completely native Python objects.
Downloads 13 Dec 2004
alt.lang.jre: Feeling Groovy
Andrew Glover offers an informal introduction to Groovy, the proposed addition to the standard programming languages for the Java platform.
Articles 03 Aug 2004
Charming Python: Get started with the Natural Language Toolkit
In this installment, David introduces you to the Natural Language Toolkit, a Python library for applying academic linguistic techniques to collections of textual data. Programming that goes by the name "text processing" is a start; other capabilities for syntactic and even semantic analysis are further specialized to studying natural languages.
Articles 24 Jun 2004
SOAPy is a SOAP/XML Schema Library for Python. Given either a WSDL or SDL document, SOAPy discovers the published API for a Web service and exposes it to Python applications as transparently as possible. SOAPy is designed to support WSDL 1.0 and SOAP 1.1.
Downloads 14 Jun 2004
Web services for bioinformatics, Part 1
This series describes the process of building, deploying, and using high-throughput web services for bioinformatics applications. This is meant to serve as a guide for development of software based on the Open-Bioinformatics Foundations software toolkits with packages such as BioPerl, BioJava, and BioPython. This article provides directions for how to deploy a service and present a new implementation of document-style web services extensions to the BioPerl module that will allow a wide range of existing applications to consume such services.
Articles 18 May 2004
Learn how to write DB2 JDBC tools in Jython
Do you want to cut development and maintenance costs for tools written in DB2 UDB JDBC? In this article Victor Yang explains how Jython can help.
Articles 01 Apr 2004
JPublish is a web publishing system designed to ensure a clean separation of developer roles. JPublish includes support for multiple templating engines, including Apache's Velocity, FreeMarker, and WebMacro, and numerous scripting languages including Python, BeanShell, and JavaScript.
Downloads 25 Mar 2004
Netegrity SiteMinder and Domino-based collaborative services
Want to use SiteMinder for single sign-on with Domino, Lotus Team Workplace (QuickPlace), and Lotus Instant Messaging and Web Conferencing (Sametime), but don’t know where to start? This article provides you with a roadmap for implementation.
Also available in: Japanese  
Articles 22 Dec 2003
Database Monitoring with BusyBee
BusyBee is a free tool you can use to monitor your IDS servers. This article explains the architecture and tells you how to use it to solve many of your monitoring problems.
Articles 25 Sep 2003
Network programming with the Twisted framework, Part 4
In this final installment of his series on Twisted, David looks at specialized protocols and servers contained in the Twisted package, with a focus on secure connections.
Articles 11 Sep 2003
Python is an open-source, interpreted, interactive, object-oriented programming language, often compared to Tcl, Perl, Scheme or Java. Python can be extended in a systematic fashion by adding new modules implemented in a compiled language such as C or C++. Such extension modules can define new functions and variables as well as new object types.
Downloads 21 Aug 2003
Jython is a Java implementation of the Python scripting language. It can be used to embed Python scripting in Java applications, execute Python scripts from within Java, or compile Python scripts to Java bytecode.
Downloads 29 Jul 2003
Network programming with the Twisted framework, Part 2
In the first installment in this series on Twisted, David introduced asynchronous server programming. While a Web server is, in a sense, just another network service, as David shows in this installment, Twisted provides a number of higher-level techniques for writing Web services.
Articles 15 Jul 2003
Network programming with the Twisted framework, Part 1
Twisted is an increasingly popular pure-Python framework for programming network services and applications. While there are a large number of loosely coupled modular components within Twisted, a central concept to the framework is the idea of non-blocking asynchronous servers. In this article, David introduces you to this style of programming -- a novel one for developers accustomed to threading or forking servers, but one capable of great efficiency under heavy loads.
Articles 25 Jun 2003
XML Matters: Process XML in Python with ElementTree
Fredrik Lundh's ElementTree module is an increasingly popular API for light-weight and fast manipulation of XML documents within Python. In this installment, David contrasts ElementTree with several other libraries devoted to processing XML instances as object trees, especially with his own gnosis.xml.objectify module.
Also available in: Japanese  
Articles 24 Jun 2003
Charming Python: Using combinatorial functions in the itertools module
Python 2.2 introduced simple generators to the Python language and reconceived standard loops in terms of underlying iterators. With Python 2.3, generators become standard (no need for _future_, and the new module itertools is introduced to work flexibly with iterators. The itertools module is essentially a set of combinatorial higher-order functions, but ones that work with lazy iterators rather than with finite lists. In this installment, David explores the new module, and gives you a sense of the new expressive power available with combinatorial iterators.
Also available in: Russian   Japanese  
Articles 12 Jun 2003
Tip: Asynchronous SAX
Over asynchronous channels -- such as a socket that produces data over a long duration -- SAX is a wonderfully lightweight programming technique for parsing incoming messages.
Articles 14 May 2003
Charming Python: Multiple dispatch
Object-oriented programming gains much of its versatility through polymorphism: objects of different kinds can behave in similar ways, given the right contexts. But most OOP programming is single dispatch; that is, just one designated object determines which code path is taken. Conceptually, a more general technique is to allow all the arguments to a function/method to determine its specialization. This article presents an implementation of multiple dispatch in Python, and shows examples where this makes for better programs."
Also available in: Russian   Japanese  
Articles 20 Mar 2003
Charming Python: Create declarative mini-languages
The object orientation and transparent introspective capabilities of Python allow you to easily create declarative mini-languages for programming tasks. In this installment, David looks not so much at using Python to interpret or translate other specialized languages (although that is possible), but rather the ways that Python code itself can be helpfully restricted to a set of declarative elements. He'll show you how developers can use declarative techniques to state application requirements in a concise and clear way, while letting the behind-the-scenes framework do the heavy work.
Also available in: Russian   Japanese  
Articles 27 Feb 2003
XML Matters: reStructuredText
The document format called reStructuredText has been adopted as one of the official source formats for Python documentation, but is also useful for other types of documentation. reStructuredText is an interesting hybrid of technologies -- in syntax and appearance it is similar to other "almost-plaintext" formats, but in semantics and API it is very close to XML. David takes a look at this format and shows you how existing tools can transform reStructuredText into several XML dialects (docutils, DocBook, OpenOffice), along with other useful formats like LaTeX, HTML, and PDF.
Also available in: Japanese  
Articles 01 Feb 2003
UDDI for Python
UDDI4Py is a Python package that allows the sending of requests to and processing of responses from the UDDI Version 2 APIs. It facilitates the transport and processing of the various SOAP messages supported by the UDDI 2.0 API.
Downloads 07 Jan 2003
Charming Python: SimPy simplifies complex models
The stochastic behavior of real-world systems is often difficult to understand or predict. Sometimes it is possible rigorously to demonstrate statistical properties of systems, such as average, worst-case, and best-case performance features. But at other times, pitfalls of concrete designs only become evident when you actually run (or simulate) a system. In this article, David takes a look at SimPy, a Python package that allows you to very easily create models of discrete event systems.
Also available in: Japanese  
Articles 01 Dec 2002
Guide to Python introspection
Introspection reveals useful information about your program's objects. Python, a dynamic, object-oriented programming language, provides tremendous introspection support. This article showcases many of its capabilities, from the most basic forms of help to the more advanced forms of inquisition.
Also available in: Russian   Japanese  
Articles 01 Dec 2002
Python persistence management
Persistence is all about keeping objects around, even between executions of a program. In this article you'll get a general understanding of various persistence mechanisms for Python objects, from relational databases to Python pickles and beyond. You'll also take an in-depth look at Python's object serialization capabilities.
Also available in: Russian   Japanese  
Articles 01 Nov 2002
Charming Python: Make Python run as fast as C with Psyco
With only a tiny amount of extra programming, Python programmers can often increase code speed by orders of magnitude with the help of an external module known as the Python Specializing Compiler (or Psyco for short). David Mertz looks at what Psyco is, and tests it in some applications.
Also available in: Russian   Japanese  
Articles 01 Oct 2002
Charming Python: Parsing with the Spark module
Spark is a powerful and general parser/compiler framework written in Python. In some respects, Spark offers more than SimpleParse or other Python parsers. Being pure Python, however, it is also slower. In this article, David discusses the Spark module, with code samples, an explanation of its usage, and suggestions for its areas of application.
Also available in: Japanese  
Articles 01 Aug 2002
Charming Python: Generator-based state machines
Introduced in Python 2.2, simple generators may be used to simplify state machines and to simulate coroutines. Coroutines are an exotic flow mechanism that few widely used languages -- not even non-Stackless Python -- allow. Python's new generators, however, get you almost all the way to coroutines, and the extra few steps can be faked. In this installment of Charming Python, David Mertz explains all the relevant concepts through illustrative code samples.
Also available in: Russian   Japanese  
Articles 01 Jul 2002
Charming Python: Implementing "weightless threads" with Python generators
David Mertz introduces weightless threads. Similar to Stackless Python microthreads, but using standard Python 2.2 -- they allow for extremely large numbers of cooperating processes with virtually no overhead.
Also available in: Russian   Japanese  
Articles 01 Jun 2002
WSDL4Py is an API implementation for the Python programming language that gives access to creating and using Web Services Description Language files. It requires you to install the Python, PyXML and 4Suite packages.
Downloads 04 Apr 2002
Charming Python: Parsing with the SimpleParse module
Many parsing tools have been written for Python. This column discusses a high-level parsing language built on top of Python.
Also available in: Japanese  
Articles 01 Jan 2002
XmlBlaster is a MOM (Message oriented Middleware) toolkit, including a publish/subscribe and point-to-point messaging server. Messages can be described with XML-encoded meta information, and can contain GIF images, Java objects, Python scripts, XML data, Word documents, plain text - anything.
Downloads 24 Sep 2001
Charming Python: pydoc and distutils modules
The introduction of several modules and tools in recent Python versions has improved Python, not so much as a language, but as a tool. Author David Mertz reviews these modules that make the job of Python developers substantially easier by improving the documentation and distribution of Python modules and packages.
Also available in: Japanese  
Articles 01 Aug 2001
XML Matters: Using Python modules xml2sql and dtd2sql
David Mertz shows that the reverse direction of translating an XML document and DTD back into an RDBMS storage format is equally possible, but with its own set of constraints and complications.
Articles 01 Jun 2001
Charming Python: Developing a full-text indexer in Python
As the volume of information grows, effective means of locating specific information become ever more crucial. This column discusses the field of full-text indexing, with a focus on the author's public-domain indexer module.
Also available in: Japanese  
Articles 01 May 2001
The Python Web services developer, Part 3: Web services software repository, Part 2
Continuing their example of a Web service for storing and managing software, Uche Ogbuji and Mike Olson illustrate how to update the repository using SOAP messages and how to advertise it as a Web service.
Also available in: Japanese  
Articles 01 May 2001
Charming Python: Updating your Python reading list
In little more than a year, the availability of material for learning and programming in Python has gone from a thin selection of books to the current forest of dead trees. Some books are general introductions to the Python language, while others specialize in particular tasks. Even within the 'general' category, level and focus differ considerably. This column gives David's impressions and recommendations on eight of the best known books about Python.
Articles 01 Feb 2001
Charming Python: TK programming in Python
David Mertz introduces TK and the Tkinter wrapper (Python's GUI library) with source code samples accompanied by detailed running commentary. To make life easy, he illustrates his examples with the GUI port of the Txt2Html front-end that he's used in many of his earlier articles. He assumes, of course, that you follow his column regularly. :)
Articles 01 Dec 2000
Charming Python: Curses programming
A certain class of Python applications works best with an interactive user interface without the overhead or complexity of a graphical environment. For interactive text-mode programs (under Linux/UNIX), for example, the ncurses library, wrapped in Python's standard curses module, is just what you need. In this article, David Mertz discusses the use of curses in Python. He illustrates the curses environment using sample source code from a front-end to the Txt2Html program.
Also available in: Japanese  
Articles 01 Sep 2000
Charming Python: Text processing in Python
Along with several other popular scripting languages, Python is an excellent tool for scanning and manipulating textual data. This article summarizes Python's 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.
Also available in: Russian   Japanese  
Articles 01 Sep 2000
Charming Python: Using state machines
State machines, in a theoretical sense, underlie almost everything related to computers and programming. And it also turns out that state machines, in a practical sense, can help solve many ordinary problems (especially for Python programmers). In this article, David Mertz discusses some practical examples of when and how to code a state machine in Python.
Also available in: Japanese  
Articles 01 Aug 2000
Charming Python: My first Web-based filtering proxy
This article introduces Txt2Html, a public-domain working project created by David to illustrate programming techniques in Python. Txt2Html is a "Web-based filtering proxy" -- a program that reads Web-based documents for the user, then presents a modified page to the user's browser. To make this possible, Txt2Html runs as a CGI program, queries outside Web resources, and makes use of regular-expressions. David steps you through each of these general-purpose subtasks, explaining, clarifying, and demonstrating along the way.
Also available in: Japanese  
Articles 01 Jul 2000
Jython is an implementation of the high-level, dynamic, object-oriented language Python written in 100% Pure Java, and seamlessly integrated with the Java platform. It thus allows you to run Python on any Java platform and compile Python into Java bytecode.
Downloads 25 Sep 1999
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