Mailman 3 June 2009 - Python-announce-list

ANN: mpmath 0.12 released
by Fredrik Johansson June 9, 2009

June 9, 2009

Hi all, Mpmath version 0.12 is now available from the website: http://code.google.com/p/mpmath/ It can also be downloaded from the Python Package Index: http://pypi.python.org/pypi/mpmath/0.12 Mpmath is a pure-Python library for arbitrary-precision floating-point arithmetic that implements an extensive set of mathematical functions. It can be used as a standalone library or via SymPy (http://code.google.com/p/sympy/). Version 0.12 mostly contains bug fixes and speed improvements. New features include various special functions from analytic number theory, Newton's method as an option for root-finding, and more versatile printing of intervals. It is now also possible to create multiple working contexts each with its own precision. Finally, mpmath now recognizes being installed in Sage and will automatically wrap Sage's fast integer arithmetic if available. For more details, see the changelog: http://mpmath.googlecode.com/svn/tags/0.12/CHANGES Bug reports and other comments are welcome at the issue tracker at http://code.google.com/p/mpmath/issues/list or the mpmath mailing list: http://groups.google.com/group/mpmath Fredrik

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ANN: cssutils 0.9.6b1
by Christof Hoeke June 9, 2009

June 9, 2009

what is it ---------- A Python package to parse and build CSS Cascading Style Sheets. (Not a renderer though!) about this release ------------------ 0.9.6b1 is a bugfix release and improves on Jython compatibility. main changes ------------ + BUGFIX: Fixed ``CSSPageRule.selectorText = ''`` which does reset the selector now + BUGFIX (minor): Removed false references in a few modules' ``__all__`` list - IMPROVEMENT: Jython 2.5 (from RC4) passes all tests now license ------- cssutils is published under the LGPL version 3 or later, see http://cthedot.de/cssutils/ If you have other licensing needs please let me know. download -------- For download options see http://cthedot.de/cssutils/ cssutils needs Python 2.4 or higher (tested with Python 2.6.2, 2.5.2, 2.4.4 and Jython 2.5RC4 on Vista only) Bug reports (via Google code), comments, etc are very much appreciated! Thanks. Christof

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python-colormath 1.0.2 Released
by Greg Taylor June 9, 2009

June 9, 2009

Greetings, python-colormath 1.0.2 has been released, which addresses an issue with chromatic adaptations. What is python-colormath? ==================== python-colormath is a developer-oriented module that abstracts a number of color math operations behind a small set of classes representing color spaces (IE: RGB, CIE Lab, XYZ, and LCH, etc.). Color conversions, delta E comparisons, and density calculations are all relatively involved, but are hid behind the simple API. For example, conversions from RGB to CMY and CMYK are trivial, while conversions from Spectral to LCHab are equally so (even though much more math happens behind the scenes). What's new in 1.0.2? =============== * Conversions between all known illuminants is now possible with several different chromatic adaptation transforms (Von Kries, Bradford, and XYZ Scaling). Previously this was only possible for some well-known CIE illuminants. * Chromatic adaptations may be _slightly_ more accurate (we're talking miniscule) on certain hardware. Where is python-colormath? ===================== Getting Started/Website/Development: http://code.google.com/p/python-colormath/ Documentation: http://code.google.com/p/python-colormath/w/list Download: http://pypi.python.org/pypi/colormath/ Support: support(a)l11solutions.com http://code.google.com/p/python-colormath/issues/list -- Gregory Taylor

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Toronto Python Users' Group (PyGTA) meeting Wednesday 17th, 7:15pm
by Mike C. Fletcher June 9, 2009

June 9, 2009

This month (June 2009) we will be meeting on the 17th (a Wednesday, *not* our regular Tuesday). Linux Caffe is at the corner of Grace and Harbord streets, 1 block South of Christie subway station. This month's presentation is... Wednesday, June 17th: Behdad Esfahbod will be presenting on how to use the Cairo rendering library from Python. Cairo is a vector graphics library that allows for targeting multiple graphical back-ends including OpenGL, X-windows, OSX Quartz, Win32, PDF, PNG etceteras. It is used in the Firefox and WebKit engines as well as the GTK library. Again, note the day-of-week! Tuesday, July 21st: Robert Jackiewicz of the Toronto Plone User's group will be presenting the zc.buildout package. Buildout is a tool for creating redistributable Python applications which is used extensively by the Zope and Plone communities. It is a "recipe" based engine for reproducing a set of modules and application code onto a number of machines. http://www.pygta.org/ If you have an idea for a presentation, theme or discussion, feel free to email it to me. Enjoy yourselves, Mike -- ________________________________________________ Mike C. Fletcher Designer, VR Plumber, Coder http://www.vrplumber.com http://blog.vrplumber.com

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Jython 2.5.0 Release Candidate 4 is out!
by Frank Wierzbicki June 8, 2009

June 8, 2009

On behalf of the Jython development team, I'm pleased to announce that Jython 2.5rc4 is available for download: http://downloads.sourceforge.net/jython/jython_installer-2.5rc4.jar See http://www.jython.org/Project/installation.html for installation instructions. This is the fourth and probably final release candidate of the 2.5.0 version of Jython. If no major bugs are found in rc4, we will relabel it as 2.5.0 final. With this version, all of the regression tests that we follow on Windows now pass. Please try this out and report any bugs that you find: http://bugs.jython.org -Frank

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ANN: pypi-grep, grep a local file of PyPI info
by denis June 8, 2009

June 8, 2009

An example first: pypi-grep 'pyqt' --> # day status packagename version homepage summary 2009-06-07 3 "pydee" 0.4.11 http://code.google.com/p/pydee/ Pydee development environment and its PyQt4-based IDE tools: ... 2009-06-05 4 "Sandbox" 0.9.5 http://www.qtrac.eu/sandbox.html A PyQt4-based alternative to IDLE ... pypi-grep is just a file with one long line per PyPI package, and a trivial bash script, basically egrep -i `newest pypi-grepfile*`. Why ? Grepping a local file is very fast and very simple, for old Unix guys and simple searches: "what's XYZ ?" hg clone http://bitbucket.org/denisb/pypi-grep/ should get pypi-grep and pypi-grepfile-2009-06-08 or the like; move them to a directory in your PATH. Notes: * the pypi-grepfile has only one version per package, the newest; multiline summaries are folded to one long line * pypi-grep -h lists the few options * the data comes from http://pypi.python.org/pypi xmlrpc, but beware: some packages in list_packages have no package_releases or no releasedata, and a few releasedatas timeout (timeout_xmlrpclib); what you see is All you get. * PyPI package names may contain blanks, even non-ascii * updates ? dunno, ask me

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progress.py 1.0.0 - Track and display progress, providing estimated completion time.
by Tim Newsome June 7, 2009

June 7, 2009

I couldn't find any module that would just let me add progress to all the random little scripts I write. So I wrote one. You can download and read about it at http://www.casualhacker.net/blog/progress_py/ Below is the module's description. I welcome any comments and suggestions. Tim DESCRIPTION This module provides 2 classes to simply add progress display to any application. Programs with more complex GUIs might still want to use it for the estimates of time remaining it provides. Use the ProgressDisplay class if your work is done in a simple loop: from progress import * for i in ProgressDisplay(range(500)): do_work() If do_work() doesn't send any output to stdout you can use the following, which will cause a single status line to be printed and updated: from progress import * for i in ProgressDisplay(range(500), display=SINGLE_LINE): do_work() For more complex applications, you will probably need to manage a Progress object yourself: from progress import * progress = Progress(task_size) for part in task: do_work() progress.increment() progress.print_status_line() If you have a more sophisticated GUI going on, you can still use Progress objects to give you a good estimate of time remaining: from progress import * progress = Progress(task_size) for part in task: do_work() progress.increment() update_gui(progress.percentage(), progress.time_remaining()) -- Tim Newsome <nuisance.at.casualhacker.net> http://www.casualhacker.net/

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ANN: Webware for Python 1.0.2 released
by Christoph Zwerschke June 7, 2009

June 7, 2009

Webware for Python 1.0.2 has been released. This is the second bugfix release for Webware for Python release 1.0, mainly fixing some problems and shortcomings of the PSP plug-in. See the WebKit and PSP release notes for details. Webware for Python is a suite of Python packages and tools for developing object-oriented, web-based applications. The suite uses well known design patterns and includes a fast Application Server, Servlets, Python Server Pages (PSP), Object-Relational Mapping, Task Scheduling, Session Management, and many other features. Webware is very modular and easily extended. Webware for Python is well proven and platform-independent. It is compatible with multiple web servers, database servers and operating systems. Check out the Webware for Python home page at http://www.w4py.org

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python-graph-1.6.0 released
by Pedro Matiello June 6, 2009

June 6, 2009

python-graph release 1.6.0 http://code.google.com/p/python-graph/ ------------------------------------------------------------------------ python-graph is a library for working with graphs in Python. This software provides a suitable data structure for representing graphs and a whole set of important algorithms. The code is appropriately documented and API reference is generated automatically by epydoc. Provided features and algorithms: * Support for directed, undirected, weighted and non-weighted graphs * Support for hypergraphs * Canonical operations * XML import and export * DOT-Language output (for usage with Graphviz) * Random graph generation * Accessibility (transitive closure) * Breadth-first search * Critical path algorithm * Cut-vertex and cut-edge identification * Depth-first search * Heuristic search (A* algorithm) * Identification of connected components * Minimum spanning tree (Prim's algorithm) * Mutual-accessibility (strongly connected components) * Shortest path search (Dijkstra's algorithm) * Topological sorting * Transitive edge identification The 1.6.x series is our refactoring series. Along the next releases, we'll change the API so we can better prepare the codebase to new features. If you want a softer, directed transition, upgrade your code to every release in the 1.6.x series. On the other hand, if you'd rather fix everything at once, you can wait for 1.7.0. Download: http://code.google.com/p/python-graph/downloads/list (tar.bz2, zip and egg packages are available.) Installing: If you have easy_install on your system, you can simply run: # easy_install python-graph

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python-colormath 1.0.1 Released
by Greg Taylor June 5, 2009

June 5, 2009

Greetings, After much testing and refinement in an industrial setting, python-colormath has been released to the public under the GPLv3. What is python-colormath? ==================== python-colormath is a developer-oriented module that abstracts a number of color math operations behind a small set of classes representing color spaces (IE: RGB, CIE Lab, XYZ, and LCH, etc.). Color conversions, delta E comparisons, and density calculations are all relatively involved, but are hid behind the simple API. For example, conversions from RGB to CMY and CMYK are trivial, while conversions from Spectral to LCHab are equally so (even though much more math happens behind the scenes). Quantitative comparisons of the difference between two colors may be calculated using one of several delta E formulas. Colors are automatically converted to the appropriate comparison color space and the delta E formula returns the result with no real effort on your part. For those working with spectral power distributions, the module can convert them to color spaces or ANSI/ISO density values. This is particularly useful when trying to minimize the difference in the readings of two different spectrophotometric devices. It is perhaps best to consider python-colormath as a more advanced, complete version of Python's own colorsys module. The number of supported color spaces, operations, and capabilities far exceeds colorsys (which is simple and minimalistic by design). Avoid color calculation errors ===================== One of the biggest benefits of this module is that it was designed and implemented by members of the Graphic Communications and print industries. The developers having a formal background in color science leaves you with a very complete, "correct" implementation of color math. Unlike the other color libraries, python-colormath avoids many of the problems with varying types of RGB, color illuminants and observer angles, and many different things that go on behind the scenes. python-colormath is also rigorously tested through its use in a previously commercial color management system. Additionally, all conversions are unit tested and monitored for deviations wich each change to the codebase. This ensures consistent, repeatable results through each release. Where is python-colormath? ===================== Getting Started/Website/Development: http://code.google.com/p/python-colormath/ Documentation: http://code.google.com/p/python-colormath/w/list Download: http://pypi.python.org/pypi/colormath/ Support: support(a)l11solutions.com I hope this fairly niche module is useful to someone else out there! -- Gregory Taylor

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