Python-announce-list November 2008

python-announce-list@python.org

50 participants
63 discussions

by Lars Immisch

Hi, I've just released PyAlsaAudio 0.4 on http://sourceforge.net/projects/pyalsaaudio/ The list of changes is: - Support for Python 3.0 - API changes: mixers() and Mixer() now take a card index instead of a card name as optional parameter. - Documentation converted to reStructuredText; use Sphinx instead of LaTeX. - added cards() - added PCM.close() - added Mixer.close() - added mixer.getenum() - Lars P.S. Porting to Python 3.0 turned out easier than expected

12 years, 5 months

ANN: urllib3 0.2 - HTTP library with thread-safe connection pooling and file posting support

by Andrey Petrov

Project website: http://code.google.com/p/urllib3/ Also available on pypi: http://pypi.python.org/pypi/urllib3 (Licensed under MIT) Highlights ========== * Re-use the same socket connection for multiple requests (``HTTPConnectionPool``) * File posting (``encode_multipart_formdata``) * Built-in redirection and retries (optional) * Thread-safe What's wrong with urllib and urllib2? ===================================== There are two critical features missing from the Python standard library: Connection re-using/pooling and file posting. It's not terribly hard to implement these yourself, but it's much easier to use a module that already did the work for you. The Python standard libraries ``urllib`` and ``urllib2`` have little to do with each other. They were designed to be independent and standalone, each solving a different scope of problems, and ``urllib3`` follows in a similar vein. Why do I want to reuse connections? =================================== Performance. When you normally do a urllib call, a separate socket connection is created with each request. By reusing existing sockets (supported since HTTP 1.1), the requests will take up less resources on the server's end, and also provide a faster response time at the client's end. With some simple benchmarks (see `test/benchmark.py <http://code.google.com/p/urllib3/source/browse/trunk/test/ benchmark.py>`_ ), downloading 15 URLs from google.com is about twice as fast when using HTTPConnectionPool (which uses 1 connection) than using plain urllib (which uses 15 connections). This library is perfect for: * Talking to an API * Crawling a website * Any situation where being able to post files, handle redirection, and retrying is useful. It's relatively lightweight, so it can be used for anything! Examples ======== Go to the `Examples wiki <http://code.google.com/p/urllib3/wiki/ Examples>`_ for more nice syntax-highlighted examples. But, long story short:: from urllib3 import HTTPConnectionPool API_URL = 'http://ajax.googleapis.com/ajax/services/search/web' http_pool = HTTPConnectionPool.from_url(API_URL) fields = {'v': '1.0', 'q': 'urllib3'} r = http_pool.get_url(API_URL, fields) print r.status, r.data Enjoy! Feedback is very welcome, please send it to shazow at gmail. - Andrey P.S. I apologize in advance for the potentially controversial name, but after much consideration it turned out to be the most descriptive one I could think of.

12 years, 5 months

ANN: Veusz 1.2.1 - a scientific plotting package / module

by Jeremy Sanders

Note: the Python embedding interface is now more robust and works under windows. Veusz 1.2.1 ----------- Velvet Ember Under Sky Zenith ----------------------------- http://home.gna.org/veusz/ Veusz is Copyright (C) 2003-2008 Jeremy Sanders <jeremy(a)jeremysanders.net> Licenced under the GPL (version 2 or greater). Veusz is a scientific plotting package. It is written in Python, using PyQt4 for display and user-interfaces, and numpy for handling the numeric data. Veusz is designed to produce publication-ready Postscript/PDF output. The user interface aims to be simple, consistent and powerful. Veusz provides a GUI, command line, embedding and scripting interface (based on Python) to its plotting facilities. It also allows for manipulation and editing of datasets. Change in 1.2.1: * Fix crash when adding a key without any key text defined. Changes in 1.2: * Boxes, ellipses, lines, arrows and image files can now be added to the plot or page and interactively adjusted. * Page sizes, graphs, grids and axes can be interactively adjusted. * Plot keys can have multiple columns. * Error bars can have cross-ends. * Several user interface usability enhancements. * Embedding interface has been rewritten to be more robust. It now uses multiple processes and sockets. * Embedding now works fully on Windows. * Embedding interface has been expanded: - Zoom width, height and page options for zooming graph to window - Dynamically change update interval - Move between pages of documents - Open up more than one view onto a document * PDF export fixed for recent versions of Qt * Quite a lot of minor bug fixes Features of package: * X-Y plots (with errorbars) * Line and function plots * Contour plots * Images (with colour mappings and colorbars) * Stepped plots (for histograms) * Fitting functions to data * Stacked plots and arrays of plots * Plot keys * Plot labels * Shapes and arrows on plots * LaTeX-like formatting for text * EPS/PDF/PNG/SVG export * Scripting interface * Dataset creation/manipulation * Embed Veusz within other programs * Text, CSV and FITS importing Requirements: Python (2.3 or greater required) http://www.python.org/ Qt >= 4.3 (free edition) http://www.trolltech.com/products/qt/ PyQt >= 4.3 (SIP is required to be installed first) http://www.riverbankcomputing.co.uk/pyqt/ http://www.riverbankcomputing.co.uk/sip/ numpy >= 1.0 http://numpy.scipy.org/ Optional: Microsoft Core Fonts (recommended for nice output) http://corefonts.sourceforge.net/ PyFITS >= 1.1 (optional for FITS import) http://www.stsci.edu/resources/software_hardware/pyfits For documentation on using Veusz, see the "Documents" directory. The manual is in pdf, html and text format (generated from docbook). Issues: * Can be very slow to plot large datasets if antialiasing is enabled. Right click on graph and disable antialias to speed up output. If you enjoy using Veusz, I would love to hear from you. Please join the mailing lists at https://gna.org/mail/?group=veusz to discuss new features or if you'd like to contribute code. The latest code can always be found in the SVN repository. Jeremy Sanders

12 years, 5 months

Ruis - multiparadigm middleware for distributed systems

by Antti Kervinen

Hello! I'd like to introduce Ruis, a new kind of library for developing distributed systems in Python. Unlike the usual distributed middleware, Ruis does not force the use of any single distributed architecture (such as client-server) nor any single distributed programming paradigm (such as RPC). Instead, you can also do peer-to-peer distribution, distributed computing, thin clients, for instance, and use reflective programming and aspect-oriented technologies in distributed setting. The Ruis package also includes webformp, a proof-of-concept web application platform as a Ruis module. It has been used in the "cross-site chat" example application: less than 100 lines of code of Python in a single file implements a chat that can be distributed on several http servers. If interested, please check out http://www.cs.tut.fi/~ask/ruis/ Yours, Antti

12 years, 5 months

ANN: Webware and DBUtils 1.0 released

by Christoph Zwerschke

The historic Webware for Python version 1.0 has finally been released. It runs with all Python versions from 2.0 to 2.6. A lot of bugs have been fixed, and a few small improvements and changes have been made since the last release. See the release notes for WebKit, MiddleKit, TaskKit, CGIWrapper and DBUtils 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. DBUtils is a suite of tools providing solid, persistent and pooled connections to a database that can be used in all kinds of multi-threaded environments like Webware for Python or other web application servers. The suite supports DB-API 2 compliant database interfaces and the classic PyGreSQL interface. Check out the Webware for Python home page at http://www.w4py.org

12 years, 5 months

Re: newbie question: if var1 == var2:

by David

Il Fri, 28 Nov 2008 19:47:01 -0800 (PST), joemacbusiness(a)gmail.com ha scritto: > I dont understand why the following code never finds "tree". New line marker to be stripped? > if item == var: if item.strip() == var: D.

12 years, 5 months

Dec 1st - Python Users Group Meeting

by Mike Driscoll

Hi, The 3rd meeting of the Iowa Python Users Group (Pyowa) is getting together next Monday, December 1st, 7-9 p.m. Be sure to mark your calendars! We currently have one presentation scheduled and a workshop where we hope to have teams work on easy to intermediate problems in an effort to learn and improve one's Python programming skills. There will probably be time for Lightning Talks (http://en.wikipedia.org/wiki/Lightning_Talk) as well if you're interested in sharing something. We are meeting at the following location: Marshall County Sheriff's Office 2369 Jessup Ave Marshalltown, IA 50158 This group is open to new and experienced programmers. Come and network with local IT personnel. If you know you can make it, could you please let me know? It's nice to have a general idea of how many will be there (there is plenty of room though). We hope to see you there! Mike Driscoll Pyowa Organizer http://www.pyowa.org

12 years, 5 months

newbie question: if var1 == var2:

by joemacbusiness＠gmail.com

Hi All, I dont understand why the following code never finds "tree". I could not find the answer in the Python tutorials. Here is the code, test43.in, and runtime: #!/usr/bin/python fname = open("test43.in") var = 'tree' for item in fname: print "item: ", item, if item == var: print "found tree: ", item, [jmccaughan@dhcppc2 work]$ [jmccaughan@dhcppc2 work]$ [jmccaughan@dhcppc2 work]$ cat test43.in car tree house pool dog cat wax candy bar [jmccaughan@dhcppc2 work]$ python test43.py item: car item: tree item: house item: pool item: dog item: cat item: wax item: candy bar Thanks, joemacbusiness(a)gmail.com

12 years, 5 months

ANNOUNCE python-mode.el 5.0.0 (Molluscs)

by Barry Warsaw

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 It's been ages since we did a formal python-mode.el release, so I took the opportunity to embrace my tryptophan induced hallucinations and release a new version. Skip was suggesting we try to include better triple quoted string support, but my motto for today is JFDI. So here it is for better or worse, and I hope we'll be making further improvements over time. I have no idea what's new since whatever version you have. RTSL and enjoy. Download from: https://launchpad.net/python-mode/+download Bugs and patches: https://launchpad.net/python-mode Cheers, - -Barry P.S. Please note that while we still have lots of artifacts sitting on the SourceForge project, and there's no way to disable them, we've requested an import of those issues into Launchpad. For all new patches and bugs, you must submit them to Launchpad or we'll probably ignore them. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (Darwin) iQCVAwUBSTAiMXEjvBPtnXfVAQJl7gQAj4uiD9xQrn530f/riOG9bRBKZt4mhre4 5wcWsYX3JWeI/gWF3lk6ckjfHTYriJNN/rFtzRL3/YPGs5ftRD2kw1matDPF8uhs Vv+pNwNatnoiVl3RzBx4uGNsaEe04LVNf8DocwheYdVCo321VSllcsC02cqXzMSZ hNpE63kAZJs= =hyn9 -----END PGP SIGNATURE-----

12 years, 5 months

Ironclad v0.7 released (compiled CPython extensions on IronPython)

by william＠resolversystems.com

Hi all I'm delighted to announce the release of Ironclad v0.7, which is now available from http://code.google.com/p/ironclad/downloads/list . This release is a major step forward: * Runs transparently on vanilla IronPython 2.0RC2, without creating extra PythonEngines or breaking .NET namespace imports * Many numpy 1.2 tests (from the core, fft, lib, linalg and random subpackages) now reliably pass (run "ipy numpytests.py" from the build directory) * Significant performance improvements (by several orders of magnitude in some places :D) So... if you want to use numpy (or other C extension modules) with IronPython on Win32, please download it and try it out; I'm very keen to hear your experiences, and to know which neglected features will be most useful to you. Cheers William

12 years, 5 months

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Python-announce-list November 2008