Python-announce-list February 2009

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54 participants
73 discussions

line_profiler and kernprof 1.0b2
by Robert Kern 19 Feb '09

19 Feb '09

line_profiler is a module for doing line-by-line profiling of functions. kernprof is a convenient script for running either line_profiler or the standard library's cProfile module. Download: http://pypi.python.org/pypi/line_profiler Docs: http://packages.python.org/line_profiler HG Repo: http://www.enthought.com/~rkern/cgi-bin/hgwebdir.cgi/line_profiler/ Just kernprof: http://packages.python.org/line_profiler/kernprof.py line_profiler ------------- line_profiler will time individual statements in specified functions. For example, here are the results of profiling a single function from a decorated version of the pystone.py benchmark (the first two lines are output from pystone.py):: Pystone(1.1) time for 50000 passes = 2.48 This machine benchmarks at 20161.3 pystones/second Wrote profile results to pystone.py.lprof Timer unit: 1e-06 s File: pystone.py Function: Proc2 at line 149 Total time: 0.606656 s Line # Hits Time Per Hit % Time Line Contents ============================================================== 149 @profile 150 def Proc2(IntParIO): 151 50000 82003 1.6 13.5 IntLoc = IntParIO + 10 152 50000 63162 1.3 10.4 while 1: 153 50000 69065 1.4 11.4 if Char1Glob == 'A': 154 50000 66354 1.3 10.9 IntLoc = IntLoc - 1 155 50000 67263 1.3 11.1 IntParIO = IntLoc - IntGlob 156 50000 65494 1.3 10.8 EnumLoc = Ident1 157 50000 68001 1.4 11.2 if EnumLoc == Ident1: 158 50000 63739 1.3 10.5 break 159 50000 61575 1.2 10.1 return IntParIO kernprof -------- kernprof will run your scripts under one of cProfiler or line_profiler in a variety of convenient ways. It has a few main features: * Encapsulation of profiling concerns. You do not have to modify your script in order to initiate profiling and save the results. * Robust script execution. Many scripts require things like __name__, __file__, and sys.path to be set relative to it. A naive approach at encapsulation would just use execfile(), but many scripts which rely on that information will fail. kernprof will set those variables correctly before executing the script. * Easy executable location. If you are profiling an application installed on your PATH, you can just give the name of the executable. If kernprof does not find the given script in the current directory, it will search your PATH for it. * Inserting the profiler into __builtins__. Sometimes, you just want to profile a small part of your code. With the [-b/--builtin] argument, the Profiler will be instantiated and inserted into your __builtins__ with the name "profile". It may be used as a decorator on the targeted functions. * Pre-profiling setup. With the [-s/--setup] option, you can provide a script which will be executed without profiling before executing the main script. This is typically useful for cases where imports of large libraries like wxPython or VTK are interfering with your results. The results of profile script_to_profile.py will be written to script_to_profile.py.prof by default. It will be a typical marshalled file that can be read with pstats.Stats(). They may be interactively viewed with the command:: $ python -m pstats script_to_profile.py.prof Such files may also be viewed with graphical tools like kcachegrind_ through the converter program pyprof2calltree_ or RunSnakeRun_. .. _kcachegrind: http://kcachegrind.sourceforge.net/html/Home.html .. _pyprof2calltree: http://pypi.python.org/pypi/pyprof2calltree/ .. _RunSnakeRun: http://www.vrplumber.com/programming/runsnakerun/ -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco

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swiss.py user group meeting on February 24, 2009
by Patrice Neff 18 Feb '09

18 Feb '09

swiss.py is the Python User Group for Switzerland, meeting in Zurich. We'll have our first meeting on February 24, 2009. Uche Mennel will talk about GUI development with Python using the Enthought Tool Suite. When: Tuesday, February 24, 2009 at 7:30pm Where: Offices of LIIP, Feldstrasse 133, Zürich http://tel.local.ch/de/q/zh/liip The intention is to meet the last Tuesday of every month. A basic web site with this information is up and running on <http://swisspy.ch/>. Patrice Neff

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PyCon 2009: Early-bird registration & hotel reservation deadlines soon!
by David Goodger 17 Feb '09

17 Feb '09

The early-bird registration deadline for PyCon 2009 is February 21, only a few days from now: <http://us.pycon.org/2009/registration/>. After that, the price for registration will be going up. Hotel reservations at the conference rates are still available, but not for long: <http://us.pycon.org/2009/registration/hotel/>. Act now, because the regular rate is considerably higher! **A reminder to tutorial and talk speakers:** you are responsible for your own registration and hotel reservations. So don't delay! -- David Goodger, PyCon 2009 Chair

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cx_Oracle 5.0.1
by Anthony Tuininga 17 Feb '09

17 Feb '09

What is cx_Oracle? cx_Oracle is a Python extension module that allows access to Oracle and conforms to the Python database API 2.0 specifications with a few exceptions. Where do I get it? http://cx-oracle.sourceforge.net What's new? 1) Added support for database change notification available in Oracle 10g Release 2 and higher. 2) Fixed bug where NCLOB data would be corrupted upon retrieval (non Unicode mode) or would generate exception ORA-24806 (LOB form mismatch). Oracle insists upon differentiating between CLOB and NCLOB no matter which character set is being used for retrieval. 3) Added new attributes size, bufferSize and numElements to variable objects, deprecating allocelems (replaced by numElements) and maxlength (replaced by bufferSize) 4) Avoided increasing memory allocation for strings when using variable width character sets and increasing the number of elements in a variable during executemany(). 5) Tweaked code in order to ensure that cx_Oracle can compile with Python 3.0.1.

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Elisa Media Center 0.5.27 Release
by Guillaume Emont 16 Feb '09

16 Feb '09

Dear Python hackers and lovers, The Elisa team is happy to announce the release of Elisa Media Center 0.5.28, code-named "Wooden Nickels". Elisa is an open source cross-platform media center connecting the Internet to an all-in-one media player. It is written in python using twisted, gstreamer and pigment among others, and runs on GNU/Linux and Microsft Windows (XP and above). More information can be found at http://elisa.fluendo.com/. This release is a "light weight" release, which means it is supposed to be pushed to the users through our automatic plugin update system. That is why there is no new Elisa installer nor any new packages from our side: use the existing ones for 0.5.27; with the default configuration, they should upgrade automatically to 0.5.28, asking you to restart Elisa when everything is downloaded. Tarballs are provided for packagers who want to disable the automatic plugin update system on their distribution, so that they can make new packages for their users to be able to update (I strongly advise that, the new video section is worth it). For Spanish users, a new version of the yesfm plugin is released at the same time through the plugin repository. Another update to that plugin should follow later this week (yes.fm no longer works without a user account). A complete list of the issues fixed can be found at: http://bugs.launchpad.net/elisa/+milestone/0.5.28 This is also summarised in the (attached) release notes. Installers and sources can be downloaded from http://elisa.fluendo.com/download/ Bug reports and feature requests are welcome at http://bugs.launchpad.net/elisa/+filebug Have a media-centered evening, Guillaume, for the Elisa team

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ANN: Assembly Line 0.8.2
by Greg Ewing 16 Feb '09

16 Feb '09

I have released an updated version of Assembly Line, my entry in PyWeek 6 and later the Pyggy Awards. http://media.pyweek.org/dl/1007/greg_pgF09/AssemblyLine-0.8.2.zip About Assembly Line ------------------- Become a FADE! That's Factory Automation Design Engineer for Pixall Manufacturing, the world leader in pixellated products. We give you product designs from our R&D department, and you design and build factories to manufacture them as efficiently possible. Make a good profit and you'll earn big bonuses and a huge salary! -- Greg

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ANN: SuPy 1.4
by Greg Ewing 15 Feb '09

15 Feb '09

SuPy 1.4 Available ------------------ http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/ Changes in this version: - Python tuples are converted to Ruby arrays, so you can pass them directly to Sketchup methods that require an array. - 'Array' function for converting other Python sequences to arrays. - X_AXIS, Y_AXIS, Z_AXIS constants. - Unit conversion constants (feet, yard, etc.) e.g. 5 * feet What is SuPy? ------------- SuPy is a plugin for the Sketchup 3D modelling application that lets you script it in Python. -- Greg Ewing greg.ewing(a)canterbury.ac.nz

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ann: PythonOCC 0.1 released
by Jelle Feringa 15 Feb '09

15 Feb '09

-about- pythonOCC aims to provide a full Python wrapper for the OpenCascade's 3D CAD modeling/visualization library classes. The first step is to focus on modeling and import/export classes (IGES, STEP, VRML) in order to provide a complete, powerful, and easy- to-use 3D modeler using Python scripts. -changes- The pythonOCC build is now modular. New OpenCascade smart pointers management. Many additional modules. Improvements in the visualization part. Interactive console fixes and enhancements. Availability for Windows, Linux, and Mac OS X. www.pythonocc.org / https://gna.org/projects/pythonocc/ Dear all, It's my pleasure to inform you that pythonOCC 0.1 has been released. This is a huge step in the development of pythonOCC, where we went from a monolithic build, to a modular approach. That makes it far easier to distribute pythonOCC based apps and speeds up the development process by a great deal. Nearly the whole OCC API is currently wrapped in pythonOCC. The 0.1 release sets the foundation of what's to come the following years. pythonOCC is no longer a proof-of- concept it represents the start of Agile CAD development. My appreciation goes out to Thomas Paviot, who has made a massive effort in getting pythonOCC to where it is today. What's next? * Like Thomas mentions on the front page of the pythonOCC site, the work has only just begun. The aim of pythonOCC is not to merely wrap OCC, but to provide a high-level, pythonic API. An example is the Topology.py in the utils directory. An idea is to make a high level declarative api. Such that vertex.x = 12.0 would deal with all the intrinsics involved in updating the coordinate of a given vertex. The api would follow OCC's topology: Vertex, Edge, Face, Solid. The traits module developed by Enthought makes event based programming a pleasure, and provides hooks for a gui based on introspection. http://code.enthought.com/projects/traits/ This is just one example of what the high level api could look like. We'd appreciate having your ideas / input on this topic very much, you're invited to share these at the project site. * Given the solid state of the .1 release, its time to formalize the development process. Let's start using the bugtracker, task manager and the other neat features the project site offers. See https://gna.org/projects/pythonocc/ * OCC SVN. Currently OCC is distributed as a .tar archive, rather than on version control. We need to fix that. We're thinking of putting OCC under version control, such that bug fixes, patches, etc. can all be merged on one single repository. The OCC community as a whole would profit from that, and hopefully become more cohesive. * Move the GUI from Wx to QT. Wx is problematic to support on OSX, also we expect QT momentum to spike given that the upcoming 4.5 release will be lgpl'd. * PR. pythonOCC needs reach out and get in the open. We're thinking of giving a presentation at EuroPython. Did you know that an early ancestor of OCC was used to construct the Concorde? That OCC is a close relative of Unisurf, the software by Bézier that sparked the development of CAD? We need the Bézier's of our time developing on top of pythonOCC. * Agile CAD. Planning on writing a paper on Agile CAD development / Open Source CAD development. pythonOCC is the underpins being able to develop CAD apps in a short timeframe, with an OS license. pythonOCC should become the premier OS CAD platform. Thanks so much for all the received feedback and we're looking forward to your continued involvement in pythonOCC. The future of Agile CAD development is looking bright! - Thomas Paviot - Jelle Feringa -

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[ANN] ftputil 2.4 released
by Stefan Schwarzer 15 Feb '09

15 Feb '09

ftputil 2.4 is now available from http://ftputil.sschwarzer.net/download . Changes since version 2.3 ------------------------- The ``FTPHost`` class got a new method ``chmod``, similar to ``os.chmod``, to act on remote files. Thanks go to Tom Parker for the review. There's a new exception ``CommandNotImplementedError``, derived from ``PermanentError``, to denote commands not implemented by the FTP server or disabled by its administrator. Using the ``xreadlines`` method of FTP file objects causes a warning through Python's warnings framework. Upgrading is recommended. Incompatibility notice ---------------------- The ``xreadlines`` method will be removed in ftputil *2.5* as well as the direct access of exception classes via the ftputil module (e. g. ``ftputil.PermanentError``). However, the deprecated access causes no warning because that would be rather difficult to implement. The distribution contains a small tool find_deprecated_code.py to scan a directory tree for the deprecated uses. Invoke the program with the ``--help`` option to see a description. What is ftputil? ---------------- ftputil is a high-level FTP client library for the Python programming language. ftputil implements a virtual file system for accessing FTP servers, that is, it can generate file-like objects for remote files. The library supports many functions similar to those in the os, os.path and shutil modules. ftputil has convenience functions for conditional uploads and downloads, and handles FTP clients and servers in different timezones. Read the documentation at http://ftputil.sschwarzer.net/documentation . License ------- ftputil is Open Source software, released under the revised BSD license (see http://www.opensource.org/licenses/bsd-license.php ). Stefan

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ANN: SuPy 1.3
by Greg Ewing 14 Feb '09

14 Feb '09

SuPy 1.3 Available ------------------ http://www.cosc.canterbury.ac.nz/greg.ewing/SuPy/ Changes in this version: - Added the rest of the promised functionality to the menus module (submenus and separators) and provided an example of its usage in examples.py. - The scheme for preserving variables using a __keep__ attribute turned out to be fatally flawed. It has been replaced by a new mechanism using a keep() function instead. See the section on "Preserving Data" for details. What is SuPy? ------------- SuPy is a plugin for the Sketchup 3D modelling application that lets you script it in Python. -- Greg Ewing greg.ewing(a)canterbury.ac.nz

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Python-announce-list February 2009