Python-announce-list December 2009

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Bazaar 2.0.3 and 2.1.0b4 released!
by John Arbash Meinel 16 Dec '09

16 Dec '09

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Bazaar team is happy to announce availability of a new releases of the bzr adaptive version control system. Bazaar is part of the GNU system <http://gnu.org/>. The third release of Bazaar 2.0 (2.0.3) has a small handful of bugfixes. As expected, this has no internal or external compatibility changes versus 2.0.2 (or 2.0.0). The fourth beta release in the 2.1 series brings with it a significant number of bugfixes (~20). The test suite is once again (finally) "green" on Windows, and should remain that way for future releases. There are a few performance related updates (faster upgrade and log), and several UI tweaks. There has also been a significant number of tweaks to the runtime documentation. 2.1.0b4 include everything from the 2.0.3 release. It is expected that the next release in the 2.1 series will be 2.1.0rc1, which means it will then enter into its stable bugfix-only phase (and 2.2.0b1 will be opened for development.) Thanks to everyone who contributed patches, suggestions, and feedback. Both the source and platform specific binaries can be downloaded from https://launchpad.net/bzr/2.0/2.0.3 https://launchpad.net/bzr/2.1/2.1.0b4 As always, all releases are available from https://launchpad.net/bzr/+download John =:-> The full changelog for 2.1.0b4 and 2.0.3 follows: bzr 2.1.0b4 ########### :Codename: san francisco airport :2.1.0b4: 2009-12-14 The fourth beta release in the 2.1 series brings with it a significant number of bugfixes (~20). The test suite is once again (finally) "green" on Windows, and should remain that way for future releases. There are a few performance related updates (faster upgrade and log), and several UI tweaks. There has also been a significant number of tweaks to the runtime documentation. 2.1.0b4 include everything from the 2.0.3 release. Compatibility Breaks ******************** * The BZR_SSH environmental variable may now be set to the path of a secure shell client. If currently set to the value ``ssh`` it will now guess the vendor of the program with that name, to restore the old behaviour that indicated the SSH Corporation client use ``sshcorp`` instead as the magic string. (Martin <gzlist(a)googlemail.com>, #176292) New Features ************ * ``bzr commit`` now has a ``--commit-time`` option. (Alexander Sack, #459276) * ``-Dhpss`` now increases logging done when run on the bzr server, similarly to how it works on the client. (John Arbash Meinel) * New option ``bzr unshelve --keep`` applies the changes and leaves them on the shelf. (Martin Pool, Oscar Fuentes, #492091) * The ``BZR_COLUMNS`` envrionment variable can be set to force bzr to respect a given terminal width. This can be useful when output is redirected or in obscure cases where the default value is not appropriate. Pagers can use it to get a better control of the line lengths. (Vincent Ladeuil) Bug Fixes ********* * After renaming a file, the dirstate could accidentally reference ``source\\path`` rather than ``source/path`` on Windows. This might be a source of some dirstate-related failures. (John Arbash Meinel) * ``bzr commit`` now detects commit messages that looks like file names and issues a warning. (Gioele Barabucci, #73073) * ``bzr ignore /`` no longer causes an IndexError. (Gorder Tyler, #456036) * ``bzr log -n0 -rN`` should not return revisions beyond its merged revisions. (#325618, #484109, Marius Kruger) * ``bzr merge --weave`` and ``--lca`` will now create ``.BASE`` files for files with conflicts (similar to ``--merge3``). The contents of the file is a synthesis of all bases used for the merge. (John Arbash Meinel, #40412) * ``bzr mv --quiet`` really is quiet now. (Gordon Tyler, #271790) * ``bzr serve`` is more clear about the risk of supplying --allow-writes. (Robert Collins, #84659) * ``bzr serve --quiet`` really is quiet now. (Gordon Tyler, #252834) * Fix bug with redirected URLs over authenticated HTTP. (Glen Mailer, Neil Martinsen-Burrell, Vincent Ladeuil, #395714) * Interactive merge doesn't leave branch locks behind. (Aaron Bentley) * Lots of bugfixes for the test suite on Windows. We should once again have a test suite with no failures on Windows. (John Arbash Meinel) * ``osutils.terminal_width()`` obeys the BZR_COLUMNS environment variable but returns None if the terminal is not a tty (when output is redirected for example). Also fixes its usage under OSes that doesn't provide termios.TIOCGWINSZ. Make sure the corresponding tests runs on windows too. (Joke de Buhr, Vincent Ladeuil, #353370, #62539) (John Arbash Meinel, Vincent Ladeuil, #492561) * Terminate ssh subprocesses when no references to them remain, fixing subprocess and file descriptor leaks. (Andrew Bennetts, #426662) * The ``--hardlink`` option of ``bzr branch`` and ``bzr checkout`` now works for 2a format trees. Only files unaffected by content filters will be hardlinked. (Andrew Bennetts, #408193) * The new glob expansion on Windows would replace all ``\`` characters with ``/`` even if it there wasn't a glob to expand, the arg was quoted, etc. Now only change slashes if there is something being glob expanded. (John Arbash Meinel, #485771) * Use our faster ``KnownGraph.heads()`` functionality when computing the new rich-root heads. This can cut a conversion time in half (mysql from 13.5h => 6.2h) (John Arbash Meinel, #487632) * When launching a external diff tool via bzr diff --using, temporary files are no longer created, rather, the path to the file in the working tree is passed to the external diff tool. This allows the file to be edited if the diff tool provides for this. (Gary van der Merwe, #490738) * The launchpad-open command can now be used from a subdirectory of a branch, not just from the root of the branch. (Neil Martinsen-Burrell, #489102) Improvements ************ * ``bzr log`` is now faster. (Ian Clatworthy) * ``bzr update`` provides feedback on which branch it is up to date with. (Neil Martinsen-Burrell) * ``bzr upgrade`` from pre-2a to 2a can be significantly faster (4x). For details see the xml8 patch and heads() improvements. (John Arbash Meinel) * ``bzrlib.urlutils.local_path_from_url`` now accepts 'file://localhost/' as well as 'file:///' URLs on POSIX. (Michael Hudson) * The progress bar now shows only a spinner and per-operation counts, not an overall progress bar. The previous bar was often not correlated with real overall operation progress, either because the operations take nonlinear time, or because at the start of the operation Bazaar couldn't estimate how much work there was to do. (Martin Pool) Documentation ************* * Lots of documentation tweaks for inline help topics and command help information. API Changes *********** * ``bzrlib.textui`` (vestigial module) removed. (Martin Pool) Internals ********* * New test Feature: ``ModuleAvailableFeature``. It is designed to make it easier to handle what tests you want to run based on what modules can be imported. (Rather than lots of custom-implemented features that were basically copy-and-pasted.) (John Arbash Meinel) * ``osutils.timer_func()`` can be used to get either ``time.time()`` or ``time.clock()`` when you want to do performance timing. ``time.time()`` is limited to 15ms resolution on Windows, but ``time.clock()`` gives CPU and not wall-clock time on other platforms. (John Arbash Meinel) * Several code paths that were calling ``Transport.get().read()`` have been changed to the equalivent ``Transport.get_bytes()``. The main difference is that the latter will explicitly call ``file.close()``, rather than expecting the garbage collector to handle it. This helps with some race conditions on Windows during the test suite and sftp tests. (John Arbash Meinel) Testing ******* * TestCaseWithMemoryTransport no longer sets $HOME and $BZR_HOME to unicode strings. (Michael Hudson, #464174) bzr 2.0.3 ######### :Codename: little italy :2.0.3: 2009-12-14 The third stable release of Bazaar has a small handful of bugfixes. As expected, this has no internal or external compatibility changes versus 2.0.2 (or 2.0.0). Bug Fixes ********* * ``bzr push --use-existing-dir`` no longer crashes if the directory exists but contains an invalid ``.bzr`` directory. (Andrew Bennetts, #423563) * Content filters are now applied correctly after pull, merge and switch. (Ian Clatworthy, #385879) * Fix a potential segfault in the groupcompress hash map handling code. When inserting new entries, if the final hash bucket was empty, we could end up trying to access if ``(last_entry+1)->ptr == NULL``. (John Arbash Meinel, #490228) * Improve "Binary files differ" hunk handling. (Aaron Bentley, #436325) -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (Cygwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkspXScACgkQJdeBCYSNAAOA1gCdHiOTI0QTcnYUJkTHU19sUVmr bXwAnirdH2ZBB9LWqSNkFmRxXeaovx4b =8rp1 -----END PGP SIGNATURE-----

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Python training in Florida, January 19-21
by Python Training 16 Dec '09

16 Dec '09

Don't miss your chance to attend our upcoming Florida Python training class next month. This 3-day public class is being held January 19-21, in Sarasota, Florida. It is open to both individual and group enrollments. For more details on the class, as well as registration instructions, please visit the class web page: http://home.earthlink.net/~python-training/2010-public-classes.html If you are unable to attend in January, our next Sarasota class is already scheduled for April 6-8. Thanks, and we hope to see you at a Python class in sunny and warm Florida soon. --Mark Lutz at Python Training Services

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Python Concurrency Workshop, January 14-15, 2010
by David Beazley 16 Dec '09

16 Dec '09

Python Concurrency Workshop, 2nd Edition with David Beazley, author "Python Essential Reference" January 14-15, 2010 Chicago, Illinois http://www.dabeaz.com/chicago Last June, you might have caught my "mindblowing" talk on the Python GIL (http://www.dabeaz.com/python/GIL.pdf). However, did you see the other eight hours of material on threads, multiprocessing, distributed computing, coroutines, and more? Probably not unless you were at my "Concurrency Workshop" the month before. I'm pleased to announce that that the Concurrency Workshop is back for another round and is better than ever. If you have been programming Python for awhile and want to take your skills up a notch, I think this may be of interest. Basically, we're going to take a in-depth look at concurrent programming idioms and library modules. Topics will include such things as threads, message passing, the multiprocessing library, distributed computing idioms, coroutines, asynchronous I/O, and other matters with an eye towards writing programs that can run on multiple CPU cores or clusters. A major theme of the workshop is to explore and understand different programming techniques, their associated performance properties, and other tradeoffs. You'll definitely walk away with new insight and a better understanding of how different parts of Python work under the covers. Likewise, I'm hoping to gain new knowledge from your experience. The workshop is strictly limited to six attendees. More details are available at the above URL. Please feel free to contact me with further questions. Cheers, Dave Beazley

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[ANN] OpenOpt 0.27 (optimization), FuncDesigner 0.17 (auto differentiation)
by dmitrey 16 Dec '09

16 Dec '09

Hi all, I'm glad to inform you about release of OpenOpt 0.27 (numerical optimization framework), FuncDesigner 0.17 (CAS with automatic differentiation, convenient modelling of linear/nonlinear functions, can use convenient modelling for some OpenOpt optimization problems and systems of linear/nonlinear equations, possibly sparse or overdetermined), DerApproximator 0.17 (finite-differences derivatives approximation, get or check user-supplied). These packages are written in Python language + NumPy; license BSD allows to use it in both free and closed-code soft See changelog for details: http://openopt.org/Changelog Regards, D.

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CodeInvestigator 0.20.0
by hans moleman 16 Dec '09

16 Dec '09

CodeInvestigator 0.20.0 was released on December 16. Changes: UI changes. You need Python 2.6 and Firefox for CodeInvestigator. CodeInvestigator is a tracing tool for Python programs. Running a program through CodeInvestigator creates a recording. Program flow, function calls, variable values and conditions are all stored for every line the program executes. The recording is then viewed with an interface consisting of the code. The code can be clicked: A clicked variable displays its value, a clicked loop displays its iterations. You read code, and have at your disposal all the run time details of that code. A computerized desk check tool and another way to learn about your program. http://sourceforge.net/project/showfiles.php?group_id=183942

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Python-URL! - weekly Python news and links (Dec 15)
by Gabriel Genellina 15 Dec '09

15 Dec '09

QOTW: "Plus, it's not something that's never foolproof." - Carl Banks, daring negater http://groups.google.com/group/comp.lang.python/msg/e8f3adbf2cc31514 Several graph libraries are available; which one is the best? maybe they should be merged? http://groups.google.com/group/comp.lang.python/t/785d100681f7d101/ http://groups.google.com/group/comp.lang.python/t/7e65ca66cd7b511/ list(generator) and the equivalent list comprehension are not always equivalent: http://groups.google.com/group/comp.lang.python/t/ae70dfa12677c1d5/ A succint way to parse a string of name=value pairs: http://groups.google.com/group/comp.lang.python/t/dc725717e63d6295/ Keep only unique elements in a list - and the perils of wrongly defining __hash__: http://groups.google.com/group/comp.lang.python/t/80491b9bc2f45547/ Python does not have a switch statement - how to overcome that? http://groups.google.com/group/comp.lang.python/t/9af90ddc7652beb0/ What are the advantages of an explicit "self"? http://groups.google.com/group/comp.lang.python/t/17a3369aef70fd38/ A new guy in the neighborhood, recently moved from PHP: http://groups.google.com/group/comp.lang.python/t/6e91d87a9a3a3edb/ http://groups.google.com/group/comp.lang.python4c295a7ca96f65c3101/ Another convert, this time coming from Perl-land: http://groups.google.com/group/comp.lang.python/t/22edc1c7eef569d5/ ======================================================================== Everything Python-related you want is probably one or two clicks away in these pages: Python.org's Python Language Website is the traditional center of Pythonia http://www.python.org Notice especially the master FAQ http://www.python.org/doc/FAQ.html PythonWare complements the digest you're reading with the marvelous daily python url http://www.pythonware.com/daily Just beginning with Python? This page is a great place to start: http://wiki.python.org/moin/BeginnersGuide/Programmers The Python Papers aims to publish "the efforts of Python enthusiasts": http://pythonpapers.org/ The Python Magazine is a technical monthly devoted to Python: http://pythonmagazine.com Readers have recommended the "Planet" site: http://planet.python.org comp.lang.python.announce announces new Python software. Be sure to scan this newsgroup weekly. http://groups.google.com/group/comp.lang.python.announce/topics Python411 indexes "podcasts ... to help people learn Python ..." Updates appear more-than-weekly: http://www.awaretek.com/python/index.html The Python Package Index catalogues packages. http://www.python.org/pypi/ Much of Python's real work takes place on Special-Interest Group mailing lists http://www.python.org/sigs/ Python Success Stories--from air-traffic control to on-line match-making--can inspire you or decision-makers to whom you're subject with a vision of what the language makes practical. http://www.pythonology.com/success The Python Software Foundation (PSF) has replaced the Python Consortium as an independent nexus of activity. It has official responsibility for Python's development and maintenance. http://www.python.org/psf/ Among the ways you can support PSF is with a donation. http://www.python.org/psf/donations/ The Summary of Python Tracker Issues is an automatically generated report summarizing new bugs, closed ones, and patch submissions. http://search.gmane.org/?author=status%40bugs.python.org&group=gmane.comp.p… Although unmaintained since 2002, the Cetus collection of Python hyperlinks retains a few gems. http://www.cetus-links.org/oo_python.html Python FAQTS http://python.faqts.com/ The Cookbook is a collaborative effort to capture useful and interesting recipes. http://code.activestate.com/recipes/langs/python/ Many Python conferences around the world are in preparation. Watch this space for links to them. Among several Python-oriented RSS/RDF feeds available, see: http://www.python.org/channews.rdf For more, see: http://www.syndic8.com/feedlist.php?ShowMatch=python&ShowStatus=all The old Python "To-Do List" now lives principally in a SourceForge reincarnation. http://sourceforge.net/tracker/?atid=355470&group_id=5470&func=browse http://www.python.org/dev/peps/pep-0042/ del.icio.us presents an intriguing approach to reference commentary. It already aggregates quite a bit of Python intelligence. http://del.icio.us/tag/python Enjoy the *Python Magazine*. http://pymag.phparch.com/ *Py: the Journal of the Python Language* http://www.pyzine.com Dr.Dobb's Portal is another source of Python news and articles: http://www.ddj.com/TechSearch/searchResults.jhtml?queryText=python and Python articles regularly appear at IBM DeveloperWorks: http://www.ibm.com/developerworks/search/searchResults.jsp?searchSite=dW&se… Previous - (U)se the (R)esource, (L)uke! - messages are listed here: http://search.gmane.org/?query=python+URL+weekly+news+links&group=gmane.com… http://groups.google.com/groups/search?q=Python-URL!+group%3Acomp.lang.pyth… http://lwn.net/Search/DoSearch?words=python-url&ctype3=yes&cat_25=yes There is *not* an RSS for "Python-URL!"--at least not yet. Arguments for and against are occasionally entertained. Suggestions/corrections for next week's posting are always welcome. E-mail to <Python-URL(a)phaseit.net> should get through. To receive a new issue of this posting in e-mail each Monday morning (approximately), ask <claird(a)phaseit.net> to subscribe. Mention "Python-URL!". Write to the same address to unsubscribe. -- The Python-URL! Team-- Phaseit, Inc. (http://phaseit.net) is pleased to participate in and sponsor the "Python-URL!" project. Watch this space for upcoming news about posting archives.

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Introduction ot Python: Change of Dates
by Steve Holden 14 Dec '09

14 Dec '09

Please note that the dates of our upcoming "Introduction to Python" three-day class in New York city have been changed to avoid the federal holiday on Martin Luther King Day. The class will now run from January 19-21. Details at http://hwebpyintnyc01.eventbrite.com/ regards Steve -- Steve Holden +1 571 484 6266 +1 800 494 3119 Holden Web LLC http://www.holdenweb.com/ UPCOMING EVENTS: http://holdenweb.eventbrite.com/

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python-graph-1.6.3 released
by Pedro Matiello 13 Dec '09

13 Dec '09

python-graph release 1.6.3 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. This release adds Python 3.x compatibility. Download: http://code.google.com/p/python-graph/downloads/list (tar.bz2, zip and sdist packages are available.) Installing: If you have easy_install on your system, you can simply run: # easy_install python-graph-core And, optionally, for Dot-Language support: # easy_install python-graph-dot

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[ANN] Karrigell-3.0.3 released
by Pierre Quentel 13 Dec '09

13 Dec '09

Hi, A new release of the Python web framework Karrigell has been published. The main changes are : - improvements to the module HTMLTags (HTML generator) : minor bug fixes ; new syntax to build the DOM tree top-down, using the <= operator ; methods for SELECT tags, checkboxes and radio buttons - extension mechanism for templating systems and a new "Karrigell Templates" (KT) template system (written by Jim Eggleston) - script to build Windows executables for an application - better resistance to bad HTTP requests and to unknown host names for the server (reports by Nicolas Pinault and "renofr") - better redirection policies to avoid exposure of index file names (suggested by "ek_wals") - change location of script caches (written by Nicolas Pinault) - minor bug fixes : problem with url unquoting, management of forms fields with the same name, valid path for session cookie - the default folder for the Windows installer is c:\(folder name) instead of Program Files (Jim reported performance issues on Windows 7) Karrigell home page : http://karrigell.sourceforge.net Discussion group : http://groups.google.com/group/karrigell Cheers, Pierre

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Distribute 0.6.9 released
by Tarek Ziadé 12 Dec '09

12 Dec '09

Hi, On behalf of the Distribute team, I am happy to release Distribute 0.6.9. == What is Distribute ? == Distribute is a fork of the Setuptools project. Distribute is intended to replace Setuptools as the standard method for working with Python module distributions. For those who may wonder why they should switch to Distribute over Setuptools, it’s quite simple: * Distribute is a drop-in replacement for Setuptools * The code is actively maintained, and has over 10 commiters * Distribute offers Python 3 support ! See : http://packages.python.org/distribute/ == Important changes == * Distribute now works fine under some versions of MacPort Python that have a bug with the platform.mac_ver() API (see http://trac.macports.org/ticket/22278) * Fixed easy_install (the command) behavior w.r.t. a local setup.cfg * Now Sandbox can allow writing in some specific files (by default : os.devnull) == Detailed Changes == * Issue 90: unknown setuptools version can be added in the working set * Issue 87: setupt.py doesn't try to convert distribute_setup.py anymore Initial Patch by arfrever. * Issue 89: added a side bar with a download link to the doc. * Issue 86: fixed missing sentence in pkg_resources doc. * Added a nicer error message when a DistributionNotFound is raised. * Issue 80: test_develop now works with Python 3.1 * Issue 93: upload_docs now works if there is an empty sub-directory. * Issue 70: exec bit on non-exec files * Issue 99: now the standalone easy_install command doesn't uses a "setup.cfg" if any exists in the working directory. It will use it only if triggered by ``install_requires`` from a setup.py call (install, develop, etc). * Issue 101: Allowing ``os.devnull`` in Sandbox * Issue 92: Fixed the "no eggs" found error with MacPort (platform.mac_ver() fails) * Issue 103: test_get_script_header_jython_workaround not run anymore under py3 with C or POSIX local. Contributed by Arfrever. * Issue 104: remvoved the assertion when the installation fails, with a nicer message for the end user. * Issue 100: making sure there's no SandboxViolation when the setup script patches setuptools. Regards, Tarek -- Tarek Ziadé | http://ziade.org

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Python-announce-list December 2009