Mailman 3 August 2003 - Python-announce-list

Ann: PXTL, the Python XML Templating Language
by Andrew Clover 10 Aug '03

10 Aug '03

PXTL is the Python XML Templating Language, a templating solution for producing XML, HTML and other text-based document types. Yes, sorry - it's another templating language. However, PXTL has some useful characteristics shared by no other Python templating language (that I have met, at least): - templates are pure XML-with-Namespaces documents, allowing authors to take advantage of generic XML authoring, testing and manipulation tools; - code structure is represented by nodes in the document tree: making the document hierarchy and the program hierarchy the same results in templates that are easy to read, write and debug; - powerful Python-style structural tools such as subtemplates and imports allow modular templates to be written. The PXTL language spec has reached revision 1.0, release candidate. Documentation is here: http://doxdesk.com/pxtl/ See the tutorial for syntax examples. The reference implementation of PXTL (version 0.9) is also now available. It is a full DOM-based implementation of PXTL with following features: - on program error, can write a useful in-depth debugging page for testing, aiding rapid development; - can read and return DOM Document trees, not just serialised text; - works anywhere: pure-Python package compatible with Python 1.5.2 and later (tested up to 2.3), with no non-standard dependencies or reliance on any application framework. The reference implementation is intended for testing, development, batch jobs and interactive use on low-traffic web sites only. An 'optimised' implementation will be included in the package as a drop-in upgrade later in the year, for high-traffic web sites which require only text output. Documentation and download (licence: new-BSD-style) here: http://doxdesk.com/software/py/pxtl.html -- Andrew Clover mailto:and@doxdesk.com http://www.doxdesk.com/

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Python for .NET preview 2 release
by Brian Lloyd 09 Aug '03

09 Aug '03

For those interested, I've made a preview-2 release of Python for .NET. Python for .NET is a near-seamless integration of the CPython runtime with the .NET Common Language Runtime (CLR). It lets you script and build applications in Python, using CLR services and components written in any language that targets the CLR (C#, Managed C++, VB.NET, etc.). Highlights of this release include array and indexer support, better thread handling, the ability to subclass managed classes in Python and many bug fixes. For more info or to download the release: http://zope.org/Members/Brian/PythonNet/ - Brian

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pytunnel 0.21 and urllib3.py
by pyguy30＠yahoo.com 09 Aug '03

09 Aug '03

pytunnel has been further updated with .netrc support and a automatic shutdown of the standalone process after it's been idle. As an example, I've also just started a wrapper for urllib2.py, for lack of a better name, I've called it urllib3.py. It ultimately calls urllib2.py to do the heavy lifting but first sets up up a tunnel (via by pytunnel). You would use it like: import urllib3 print urllib3.urlopen('https://login.yahoo.com/',ssl='proxy_server').read() The ssl option tells urllib3 to setup a tunnel with proxy_server. Both programs are at: http://savannah.nongnu.org/download/pytunnel/urllib3.py http://savannah.nongnu.org/download/pytunnel/pytunnel.py What is pytunnel? Pytunnel is a program that tunnels TCP/IP through another server like a proxy. A typical use would be to tunnel through an http proxy. Pytunnel supports basic http proxy authentication. Pytunnel allows your software to connect to the local tunnel rather than connecting to the remote server directly. For example, if doing SSL, instead connecting to the webhost on port 443 you connect to localhost using the locally determined port. Pytunnel makes use of several technologies asyncore, threads, and non-blocking sockets w\a custom recv_all to take advantage of that. The tunnel has no knowledge of the protocol being tunneled through it, instead, it keeps the tunnel alive as long as any bit of data, now matter how tiny, comes across it. Once the data stops after a user defined timeout, tunnel shuts down. This program can be either used as a library or standalone tunnel. john

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omniORB 4.0.2 and omniORBpy 2.2 released
by Duncan Grisby 08 Aug '03

08 Aug '03

omniORB version 4.0.2 and omniORBpy 2.2 are now available. omniORB is a robust, high performance CORBA ORB for C++. omniORBpy is a version for Python. They are freely available under the terms of the GNU LGPL. These are mainly bug fix releases. Highlights of the new releases include: - Bug fixes. - Use of standard iostreams in omniNames etc., if available. - Rudimentary Python interceptor support. - Performance improvements. The releases can be downloaded from SourceForge from this page: http://sourceforge.net/project/showfiles.php?group_id=51138 For general omniORB details, see this page: http://omniorb.sourceforge.net/ Enjoy! Duncan. -- -- Duncan Grisby -- -- duncan(a)grisby.org -- -- http://www.grisby.org --

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ANN: EmPy 3.0.4 -- A powerful and robust templating system for Python
by Erik Max Francis 08 Aug '03

08 Aug '03

Summary A powerful and robust templating system for Python. Overview EmPy is a system for embedding Python expressions and statements in template text; it takes an EmPy source file, processes it, and produces output. This is accomplished via expansions, which are special signals to the EmPy system and are set off by a special prefix (by default the at sign, '@'). EmPy can expand arbitrary Python expressions and statements in this way, as well as a variety of special forms. Textual data not explicitly delimited in this way is sent unaffected to the output, allowing Python to be used in effect as a markup language. Also supported are callbacks via hooks, recording and playback via diversions, and dynamic, chainable filters. The system is highly configurable via command line options and embedded commands. Expressions are embedded in text with the '@(...)' notation; variations include conditional expressions with '@(...?...!...)' and the ability to handle thrown exceptions with '@(...$...)'. As a shortcut, simple variables and expressions can be abbreviated as '@variable', '@object.attribute', '@function(arguments)', '@sequence[index]', and combinations. Full-fledged statements are embedded with '@{...}'. Control flow in terms of conditional or repeated expansion is available with '@[...]'. A '@' followed by a whitespace character (including a newline) expands to nothing, allowing string concatenations and line continuations. Comments are indicated with '@#' and consume the rest of the line, up to and including the trailing newline. '@%' indicate "significators," which are special forms of variable assignment intended to specify per-file identification information in a format which is easy to parse externally. Context name and line number changes can be done with '@?' and '@!' respectively. Escape sequences analogous to those in C can be specified with '@\...', and finally a '@@' sequence expands to a single literal at sign. Getting the software The current version of empy is 3.0.4. The latest version of the software is available in a tarball here: http://www.alcyone.com/pyos/empy/empy-latest.tar.gz. The official URL for this Web site is http://www.alcyone.com/pyos/empy/. Requirements EmPy should work with any version of Python from 1.5.2 onward. It has been tested with all major versions of CPython from 1.5 up, and Jython from 2.0 up (using Java runtimes 1.3 and 1.4). The included test script is intended to run on Unix-like systems with a Bourne shell. License This code is released under the GPL. .... Release history [since 3.0.3] - 3.0.4; 2003 Aug 7. Somewhat more robust lvalue parsing for '@[for]' construct (thanks to Beni Cherniavsky for inspiration).

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Game Company looking for Employiees
by BlackHawke 08 Aug '03

08 Aug '03

Hello! My name is Nick Soutter, I am the owner of a small game company in San Diego, CA called Aepox Games (www.aepoxgames.net). Our first product, Andromeda Online (www.andromedaonline.net), goes commercial in a few months. We are in pre-production of our second project, codenamed "Avalon". It is a MMORPG. We have started a working relationship with a hosting company which can host our game, to our specifications, with up to 1 millions simultaneous players online with no lag (butterfly.net, partnered with IBM, using an ingenious method of data management to offer stability, reliability, and ultra fast reaction time with no lag). Because we are a small company, cost is an extremely limiting factor. We don 't have a lot of funds to throw at this, though we hope the success of Andromeda Online will help. Our arrangement with butterfly.net will allow us to pay on demand- as we gain more subscribers, we pay them proportionately, drastically reducing our upfront costs. There are two areas we are now lacking: 1: We need python scripters. Much of the programming used for the servers must necessarily be in python. The bulk of our code will be in Python, and we have no access to Python programmers at the moment. 2: We need people capable of programming vast worlds in the CrystalSpace 3d engine. While we do have excellent graphic artists on hand, we have no-one capable of developing the lands and cities in this game. We have chosen CrystalSpace because of our financial concerns. We are looking for Python programmers, and CrystalSpace developers. We are hopefully going to be able to pay a decent wage, but probably not a fully commensurate salary. Our company is strapped for cash. In addition to pay, however, we have a lot to offer. We are offering the potential for a long term job (if Avalon does well, we'll need continued support for years to come). We are offering the chance to get in on the ground floor of a budding game company. We also believe fully in giving credit to those who work for us. For you budding programmers, this is the chance for a big project, where you are needed, appreciated, and your work will be public and commercial. We are in pre-development. We have not begun production. Production is not slated to begin for another 6 months. We would like people in the San Diego area, it makes things mildly easier. HOWEVER, it is not a requirement. Andromeda was done with most of us never physically meeting the programmer. We have strong internet management and development resources. At present, we are simply trying to get some names, get a feel for who might be interested, the kind of experience they may have, and what our resources may be before we begin. Anybody interested, please send me an email, with your resume, at nsoutter(a)aepoxgames.com. Please only send us your resume if you are interested. Sending us your resume is not a promise you will take the project, nor is accepting your resume a promise of getting a job. We are simply trying to see who is interested, and what they can do. Thank you for your time, and I hope you consider us. Nick Soutter Aepox Games

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sre_dump.py
by Andrew Dalke 07 Aug '03

07 Aug '03

sre_dump.py -- http://www.dalkescientific.com/Python/ Converts an sre_parse parse tree back into a regular expression, and includes information about where subexpressions can be found in that string. I have a certain fondness for writing regular expression based parsers. /F's sre_parse module (an internal part of the standard library) has been very fun to use in these projects. It turns a regular expression into a simple parse tree, which I use to generate my own parsers. When debugging, I want to know which part of the regular expression contributed to the part of the parser with the bug. The sre_dump module helps by using the parse tree to recreate the original pattern and tracking where the branches are in the string. The result is that I can do >>> s, offsets = sre_dump.dump_and_offsets("AB|CD") >>> def show_offsets(s, offsets): ... print s ... for expr, i, j, text in offsets: ... print " "*i + "-"*(j-i) + " " *(len(s)-j+1), s[i:j] ... >>> show_offsets(s, offsets) AB|CD - A - B - C - D ----- AB|CD >>> Andrew dalke(a)dalkescientific.com

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ANN: Confluence 0.6
by tom1＠launchbird.com 07 Aug '03

07 Aug '03

Confluence is a functional programming language for digital logic design (FPGA/ASIC) and real-time embedded software development. Confluence source code compiles into Verilog, VHDL, C, and Python for synthesis, implementation, and verification. The release of Confluence 0.6 includes many language and compiler improvements including simplified syntax, static connection analysis, and increased debugging visibility. Also in the release is a new unit testing framework for assertion based verification of Confluence programs and output code (HDL/C/Python). Test suites, packaged in the distribution, use the framework to verify the Confluence standard libraries and output code generators. Release Notes, Documentation, and Download: http://www.launchbird.com/download.html Online Compiler: http://www.launchbird.com/cgi-bin/compiler.py Confluence Mailing Lists: http://www.launchbird.com/mailinglists.html -- Tom Hawkins Launchbird Design Systems, Inc. 952-200-3790 tom1(a)launchbird.com http://www.launchbird.com/

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Preview of Python 2.3 Installer for Win64 Itanium available
by Martin v. L�wis 07 Aug '03

07 Aug '03

I made an initial attempt at packaging Python 2.3 for Itanium, using Microsoft Installer. The result is available at http://www.dcl.hpi.uni-potsdam.de/home/loewis/python23.msi I have tested this installer on W2k3-IA64; it will not do anything useful on x86 hardware. There are a number of known problems: - A few tests fail. Most of these are apparently errors in the test suite and no need to worry. - Neither _tkinter nor _bsddb appear to work. Any insight on the cause of the problems, and possible solutions are appreciated. - De-installation will leave behind the .pyc files. Please let me know what you think. Martin v. Löwis

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ANN: ElementTree 1.2 alpha 2, ElementTidy 1.0 alpha 1
by Fredrik Lundh 05 Aug '03

05 Aug '03

The Element type is a simple but flexible container object, designed to store hierarchical data structures, such as simplified XML infosets, in memory. The ElementTree package provides a Python implementation of this type, plus code to serialize element trees to and from XML files. The 1.2 alpha 2 release fixes some minor issues (most notably, nicer serialization of the "xml" default namespace). You can get the ElementTree toolkit from: http://effbot.org/downloads Brief documentation and some code samples (including an XML-RPC unmarshaller in 16 lines) are available from: http://effbot.org/zone/element-index.htm If you want more sample code, my blog currently features a number of short articles on parsing stuff with element trees (the first four all deal with RSS and RSS-like formats): http://online.effbot.org/2003_07_01_archive.htm#element-tricks In a related release, the ElementTidy library provides an alternative tree builder that can read (almost) arbitrary HTML, and turn it into well-formed XHTML element trees. The ElementTidy library uses a library versions of Dave Raggett's HTML Tidy utility to do the clean- up (source code is included), and does not rely on external utilities. http://effbot.org/downloads http://effbot.org/zone/element-tidylib.htm enjoy /F

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