Python-announce-list December 2007

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44 participants
58 discussions

ANN: cogen 0.1.0 coroutine library
by Ionel Maries Cristian 10 Dec '07

10 Dec '07

This is a library for network oriented, coroutine based programming. The interfaces and events/operations aim to mimic thread features. Coroutines work as simple generators, the operations and events work as objects passed in and out of the generator, these objects are managed by the scheduler/network poller. Features * basic scheduling priority management * timeouts for operations * fast network with epoll for linux platforms (select for win32) * send file support * signal events * wsgi server Available at: http://pypi.python.org/pypi/cogen/0.1.0 Project page at: http://code.google.com/p/cogen/ Any feedback is welcome. -- ionel.

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ANN: next pyCologne meeting, Wed Dec 12, 2007, 6:30 pm
by Christopher Arndt 10 Dec '07

10 Dec '07

Dear Pythonistas, the next monthly meeting of pyCologne, the Python User Group Köln, takes place on: Date: Wednesday Dec 12, 2007 Time: 6:30 Uhr pm c.t. Venue: Room 1.08 , 1st floor, computing centre (RRZK-B) Universität Köln, Berrenrather Str. 136, 50937 Köln Around 8:30 pm we will head to a nearby establishment and have some drinks, food and a friendly chat or maybe visit the Christmas market. Further information about pyCologne, including directions, photographs and minutes of past meetings etc., can be found on our page in the German Python wiki: http://wiki.python.de/pyCologne CU, Christopher Arndt

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Mocker 0.10
by Gustavo Niemeyer 10 Dec '07

10 Dec '07

Greetings! Mocker 0.10 has been released. The list of changes is provided below. Where ----- Links to files and documentation are available at: http://labix.org/mocker About ----- - Graceful platform for test doubles in Python (mocks, stubs, fakes, and dummies). - Inspiration from real needs, and also from pmock, jmock, pymock, easymock, etc. - Expectation of expressions defined by actually using mock objects. - Expressions may be replayed in any order by default, - Trivial specification of ordering between expressions when wanted. - Nice parameter matching for defining expectations on method calls. - Good error messages when expectations are broken. - Mocking of many kinds of expressions (getting/setting/deleting attributes, calling, iteration, containment, etc) - Graceful handling of nested expressions (e.g. "person.details.get_phone().get_prefix()") - Mock "proxies", which allow passing through to the real object on specified expressions (e.g. useful with "os.path.isfile()"). - Mocking via temporary "patching" of existent classes and instances. - Trivial mocking of any external module (e.g. "time.time()") via "proxy replacement". - Mock objects may have method calls checked for conformance with real class/instance to prevent API divergence. - Type simulation for using mocks while still performing certain type-checking operations. - Nice (optional) integration with "unittest.TestCase", including additional assertions (e.g. "assertIs", "assertIn", etc). - More ... Changes in 0.10 --------------- - Greatly improved error messages and logic for expression ordering! - Implemented MockerTestCase.addCleanup(). It allows one to register cleanup functions to be called after the test is complete. - MockerTestCase now verifies if the mocker is put in replay mode in cases where events were recorded. - New MATCH() argument matcher, which allows using a function to match an argument generically. E.g. MATCH(lambda x: x > 10) - New 'path' option to MockerTestCase.makeFile() and makeDir(), which allows setting the full target path with a single option. - Now when a spec is provided (or with proxy/replace/patch) the existence of the real method is checked even if the mocked method doesn't execute. This is useful to detect API expectation errors even if count(0) is used (a negative assertion). - Implemented in MockerTestCase support for Deferred results as understood by Twisted Trial's TestCase, so that coexistence by multiple inheritance is possible and trivial. - MockerTestCase.makeFile() with content=None (the default) now consistently returns an unexistent temporary filename which is properly cleaned up if created. - Fixed problem when requesting order on similar expressions. The second expression might not be accepted. - When the expression executed isn't exactly the same as the recorded events (e.g. when parameter matchers are used), show in the error message the real expression run, to aid in debugging. -- Gustavo Niemeyer http://niemeyer.net

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CodeInvestigator version 0.6.2 released.
by martien friedeman 09 Dec '07

09 Dec '07

CodeInvestigator version 0.6.2 was released on December 10. This version catches generate exceptions: Runs did not show when the generate failed. And a bug was fixed where variables did not underline when another iteration was selected. CodeInvestigator is a tracing tool for Python programs. Running a program trough 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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ANN: Axon.STM 1.0.0 (beta) Minimalistic Software Transactional Memory
by Michael Sparks 09 Dec '07

09 Dec '07

Hi, I've packaged up the minimal STM discussed over the past couple of days as a standalone package which I've now uploaded Getting it ========== You can download a beta test version here: http://thwackety.com/Axon.STM-1.0.0.tar.gz Previewing it ============= You can look at the sourcecode online here: https://kamaelia.svn.sourceforge.net/svnroot/kamaelia/branches/private_MPS_… Installing it ============= ~ > tar zxf Axon.STM-1.0.0.tar.gz ~ > cd Axon.STM-1.0.0/ ~ > sudo python setup.py install What IS it? =========== Software Transactional Memory (STM) is a technique for allowing multiple threads to share data in such a way that they know when something has gone wrong. It's been used in databases (just called transactions there really) for some time and is also very similar to version control. Indeed, you can think of STM as being like variable level version control. Note: Because this is NOT intended to be persistent, this is not an ACID store because it doesn't support the D - durability across a crash. (after all, we don't save the state to disk) (The other aspects atomicity, consistency & isolation are supported though) I've written this to allow a part of Kamaelia to share & manage a dictionary of atomic values between threads simply, and as a result this code is also going into mainline Kamaelia. (Specifically into Axon Kamaelia's core) However STM is something that should hopefully be of use to others doing concurrent *things* whether or not they're using kamaelia, hence this stand alone release. This stand alone release should *not* be used alongside mainline Axon yet. (Well you can, as long as you reinstall your Axon over the top, but that's icky :-) Why is it useful? ================= [ please skip this (or correct me :) if you understand concurrency already :-) ] Why do you need it? Well, in normal code, Global variables are generally shunned because it can make your code a pain to work with and a pain to be certain if it works properly. Even with linear code, you can have 2 bits of code manipulating a structure in surprising ways - but the results are repeatable. Not-properly-managed-shared-data is to threaded systems as not-properly-managed-globals are to normal code. (This code is one way of helping manage shared data) Well, with code where you have multiple threads active, having shared data is like an even nastier version of globals. Why? Well, when you have 2 (or more) running in parallel, the results of breakage can become hard to repeat as two pieces of code "race" to update values. With STM you make it explicit what the values are you want to update, and only once you're happy with the updates do you publish them back to the shared storage. The neat thing is, if someone else changed things since you last looked, you get told (your commit fails), and you have to redo the work. This may sound like extra work (you have to be prepared to redo the work), but it's nicer than your code breaking :-) The way you get that message is the .commit raises a ConcurrentUpdate exception. Also, it's designed to work happily in code that requires non-blocking usage - which means you may also get a "BusyRetry" exception under load. If you do, you should as the exception suggests retry the action that you just tried. (With or without restarting the transaction) Apologies if that sounds too noddy :) Docs for it =========== http://kamaelia.sourceforge.net/STM Using It ======== # Initialising a Store from Axon.STM import Store S = Store() # Single values greeting = S.usevar("hello") print repr(greeting.value) greeting.set("Hello World") greeting.commit() S.dump() # Groups of values D = S.using("account_one", "account_two", "myaccount") D["account_one"].set(50) D["account_two"].set(100) D.commit() S.dump() D = S.using("account_one", "account_two", "myaccount") D["myaccount"].set(D["account_one"].value+D["account_two"].value) D["account_one"].set(0) D["account_two"].set(0) D.commit() S.dump() License ======= Take your pick of MPL V1.1, GPL 2.0, LGPL 2.1 :-) Feedback ======== Feedback is very welcome, preferably via email to the Kamaelia List * kamaelia-list(a)lists.sourceforge.net Feedback especially regarding bugs and logical errors is particularly welcome. (hopefully there aren't any - but it's always hard to spot your own) Thanks ====== Many thanks to Fuzzyman, Duncan Booth, John J Lee & Sylvain Hellegouarch for feedback whilst I was prototyping this. Best Regards, Michael. -- Michael Sparks, Kamaelia Project http://kamaelia.sourceforge.net/Developers/ http://yeoldeclue.com/blog

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[ANN] Leipzig Python User Group - Meeting, December 11, 2007, 08:00pm
by Mike Müller 09 Dec '07

09 Dec '07

=== Leipzig Python User Group === We will meet on Tuesday, December 11 at 8:00 pm at the training center of Python Academy in Leipzig, Germany ( http://www.python-academy.com/center/find.html ). Food and soft drinks are provided. Please send a short confirmation mail to info(a)python-academy.de, so we can prepare appropriately. Everybody who uses Python, plans to do so or is interested in learning more about the language is encouraged to participate. While the meeting language will be mainly German, we will provide English translation if needed. Current information about the meetings are at http://www.python-academy.com/user-group . Mike == Leipzig Python User Group === Wir treffen uns am Dienstag, 11.12.2007 um 20:00 Uhr im Schulungszentrum der Python Academy in Leipzig ( http://www.python-academy.de/Schulungszentrum/anfahrt.html ). Für das leibliche Wohl wird gesorgt. Eine Anmeldung unter info(a)python-academy.de wäre nett, damit wir genug Essen besorgen können. Willkommen ist jeder, der Interesse an Python hat, die Sprache bereits nutzt oder nutzen möchte. Aktuelle Informationen zu den Treffen sind unter http://www.python-academy.de/User-Group zu finden. Viele Grüße Mike

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bsddb185 v1.0 for Python 2.6 and 3.0
by skip＠pobox.com 08 Dec '07

08 Dec '07

Python 3.0 will dispense with the rarely used, but occasionally indispensible, bsddb185 module. I extracted the source code and unit tests from the current Python trunk, wrote a setup.py, made a couple slight mods so it would build and pass tests under both Python 2.6 and 3.0. It's available from the Python Package Index: http://pypi.python.org/pypi/bsddb185 Cheers, -- Skip Montanaro - skip(a)pobox.com - http://www.webfast.com/~skip/

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PSSC: Phone Screen Sequential Capture
by Michele Andreoli 08 Dec '07

08 Dec '07

Hi group, PSSC allow to see the Symbian S60 phone's display on a window of your Linux PC , using bluetooth connections. Here is the webpage and a video showing the standard scenario: http://mulinux.sunsite.dk/python/pssc.html Best regards, Michele Andreoli

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Elixir 0.5.0 released!
by Gaetan de Menten 08 Dec '07

08 Dec '07

I am very pleased to announce that version 0.5.0 of Elixir (http://elixir.ematia.de) is now available. As always, feedback is very welcome, preferably on Elixir mailing list. This is mostly a bug fixes release, but we have also had some pretty important changes to the default values for options. Please look at http://elixir.ematia.de/trac/wiki/Migrate04to05 for detailed upgrade notes. The full list of changes can be seen at: http://elixir.ematia.de/trac/browser/elixir/tags/0.5.0/CHANGES What is Elixir? --------------------- Elixir is a declarative layer on top of the SQLAlchemy library. It is a fairly thin wrapper, which provides the ability to create simple Python classes that map directly to relational database tables (this pattern is often referred to as the Active Record design pattern), providing many of the benefits of traditional databases without losing the convenience of Python objects. Elixir is intended to replace the ActiveMapper SQLAlchemy extension, and the TurboEntity project but does not intend to replace SQLAlchemy's core features, and instead focuses on providing a simpler syntax for defining model objects when you do not need the full expressiveness of SQLAlchemy's manual mapper definitions. Mailing list ---------------- http://groups.google.com/group/sqlelixir/about -- Gaëtan de Menten http://openhex.org

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Python tickets summary - renewed
by Facundo Batista 07 Dec '07

07 Dec '07

People: Well, after my hosting allowing CGI, I now improved *a lot* the interface of this page. Now you have more columns: - Id - Summary - Priority - Severity - Components - Versions - Keywords - Opened by (when) - Temporal location - Last update by (when) And, the biggest enhancement, you can filter by any combination of: - Priority - Severity - Component - Version - Keyword As before, you have everything paged, and with a graph of activity per day at the bottom. Enjoy it!: http://www.taniquetil.com.ar/facundo/py_tickets.html Regards, -- . Facundo Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/

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Python-announce-list December 2007