Mailman 3 February 2013 - Python-announce-list

ANN: Training - Introduction to Django, November 4 - 6, 2013
by Mike Müller 14 Feb '13

14 Feb '13

Introduction to Django ====================== What: An hands-on introduction to Django When: November 4 - 6, 2013 Where: Python Academy, Leipzig, Germany Who: Markus Zapke-Gründemann Details: http://www.python-academy.com/courses/django_course_introduction.html Django is a very popular web framework for Python. This course offers a structured introduction based on the experience from many Django projects of the trainer. Do you want to get up to speed with Django fast? Than this course is for you. Learn best practices and how to use the rich tool sets Python and Django offer to develop professional, performant and maintainable web applications. If you already have good Django knowledge and would like to learn even more, we recommend or "Advanced Django" training [1] November 7 - 9, 2013. Since both courses are offered back-to-back, you have the chance to attend a six-day Django immersion. The course is offered in Leipzig, Germany. This city has about half a million inhabitants and provides a very rich cultural life. It was the home of the first two PyCon DE conferences in 2011 and 2012. The teaching location can be easily reached via car or public transportation. Leipzig is very well connected to the German Autobahn and railway systems. The airport is only 15 taxi minutes away from the training location. There are plenty of reasonably priced hotels nearby. We offer this course also in German: http://www.python-academy.de/Kurse/django_kurs_einstieg.html [1] http://www.python-academy.com/courses/django_course_advanced.html

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ANN: Training - Django für Fortgeschrittene (German), 6. - 8. Juni 2013
by Mike Müller 14 Feb '13

14 Feb '13

This announcement is in German because the training is offered in German. We do offer an English version [1]. Django für Fortgeschrittene =========================== Was: Tiefes Eintauschen in Django Wann: 6. - 8. Juni 2013 Wo: Python Academy, Leipzig Wer: Markus Zapke-Gründemann Details: http://www.python-academy.de/Kurse/django_kurs_fortgeschrittene.html Sie nutzen Django und wollen mehr darüber wissen? Dann können Sie in diesem Kurs tief in fortgeschrittene Konzepte einsteigen. Der Kurs wird Ihnen helfen bessere Anwendungen schneller zu entwickeln. Wenn Sie Django noch nicht nutzen und mit den Grundlagen nicht vertraut sind, empfehlen wir unseren Kurs "Einstieg in Django" [2]. Dieser Kurs vom 3. bis 5. Juni liegt direkt vor dem Kurs für Fortgeschrittene, so dass Sie die Möglichkeit haben sechs Tage Django-Total zu genießen. Der Kurs findet in Leipzig statt, das ein sehr reiches kulturelles Leben bietet. Leipzig war Gastgeber der ersten beiden PyCon DE Konferenzen 2011 und 2012. Leipzig ist sehr gut mit dem Auto und mit öffentlichen Verkehrsmitteln zu erreichen. Das Schulungszentrum ist jeweils eine nur Viertelstunde vom Hauptbahnhof oder Flughafen entfernt und von der Autobahnabfahrt sind es nur wenige Minuten bis zu uns. Leipzig bietet reichlich gute Hotels zu sehr moderaten Preisen. Der gleiche Kurs ist auch in englischer Sprache verfügbar [1]. [1] http://www.python-academy.com/courses/django_course_advanced.html [2] http://www.python-academy.de/Kurse/django_kurs_einstieg.html

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ANN: Training - Einstieg in Django (German), 3. - 5. Juni 2013
by Mike Müller 14 Feb '13

14 Feb '13

This announcement is in German because the training is offered in German. We do offer an English version [1]. Einstieg in Django ================== Was: Praktischer Einstieg in die Entwicklung von Web-Anwendungen mit Django Wann: 3. - 5. Juni 2013 Wo: Python Academy, Leipzig Wer: Markus Zapke-Gründemann Details: http://www.python-academy.de/Kurse/django_kurs_einstieg.html Django ist ein sehr beliebtes Framework für die Entwicklung von Webanwendungen mit Python. In diesem Kurs lernen die Teilnehmer alle Grundlagen von Django von unserem erfahrenen Django-Trainer. Möchten Sie schnell gute Django-Anwendungen schreiben? Dann ist das der richtige Kurs für Sie. Erlernen Sie Best Practices und wie Sie die vielen Werkzeuge rund um Python und Django effektiv für die Entwicklung professioneller, performanter und wartbarer Web-Anwendungen nutzen. Wenn Sie Django schon nutzen und mit den Grundlagen vertraut sind, empfehlen wir unseren Kurs "Django für Fortgeschrittene" [2]. Dieser schließt sich direkt vom 6. bis 8. Juni an, so dass Sie die Möglichkeit haben sechs Tage Django-Total zu genießen. Der Kurs findet in Leipzig statt, das ein sehr reiches kulturelles Leben bietet. Leipzig war Gastgeber der ersten beiden PyCon DE Konferenzen 2011 und 2012. Leipzig ist sehr gut mit dem Auto und mit öffentlichen Verkehrsmitteln zu erreichen. Das Schulungszentrum ist jeweils eine nur Viertelstunde vom Hauptbahnhof oder Flughafen entfernt und von der Autobahnabfahrt sind es nur wenige Minuten bis zu uns. Leipzig bietet reichlich gute Hotels zu sehr moderaten Preisen. Der gleiche Kurs ist auch in englischer Sprache verfügbar [1]. [1] http://www.python-academy.com/courses/django_course_introduction.html [2] http://www.python-academy.de/Kurse/django_kurs_fortgeschrittene.html

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ANN: Training - Professional Testing with pytest and tox
by Mike Müller 12 Feb '13

12 Feb '13

Professional Testing with pytest and tox ======================================== What: An in-depth pytest and tox course When: June 24 - 26, 2013 Where: Python Academy, Leipzig, Germany Who: Holger Krekel Details: http://www.python-academy.com/courses/specialtopics/python_course_testing.h… You always write tests for your code, even before you write the code itself, right? If yes, than you can learn how to do this with the help of pytest [1] and tox [2]. These smart Python tools help you to make your tests better. If you don't write tests yet, you can learn how to do this on a professional level right from the beginning. Join Holger Krekel, the author of pytest and tox, when he explains how to integrate testing and deployment using real-world examples. Learn what it means to do pythonic testing by taking advantage of Python's philosophy to make simple things simple and complex things possible. Bring your own problems to be discussed in the course. The course is offered in Leipzig, Germany. This city has about half a million inhabitants and provides a very rich cultural life. It was the home of the first two PyCon DE conferences in 2011 and 2012. The teaching location can be easily reached via car or public transportation. Leipzig is very well connected to the German Autobahn and railway systems. The airport is only 15 taxi minutes away from the training location. There are plenty of reasonably priced hotels nearby. [1] http://pytest.org/latest/ [2] http://codespeak.net/tox/

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ANN: Twisted Training - Three days to untwist the framework
by Mike Müller 12 Feb '13

12 Feb '13

Twisted Training ================ What: An in-depth Twisted course When: September 9 - 11, 2013 Where: Python Academy, Leipzig, Germany Who: Laurens Van Houtven Details: http://www.python-academy.com/courses/specialtopics/python_course_twisted.h… Twisted [1] is a powerful framework to develop network applications of all kinds. Since the way it works is somewhat different from the typical Python programming style, it might not be that easy to take full advantage of all the power that comes with Twisted. This course gives a solid introduction and takes you deep into the land of deferreds, callbacks and events. Learn from the Twisted committer Laurens Van Houtven how to integrate Twisted into existing, non-Twisted applications. Inherited some Twisted code and feel kind of lost? This training will help you to understand what is going on. The course is offered in Leipzig, Germany. This city has about half a million inhabitants and provides a very rich cultural life. It was the home of the first two PyCon DE conferences in 2011 and 2012. The teaching location can be easily reached via car or public transportation. Leipzig is very well connected to the German Autobahn and railway systems. The airport is only 15 taxi minutes from the training location. There are plenty of reasonably priced hotels nearby. [1] http://twistedmatrix.com/

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makefile based python build
by Antonio Cavallo 11 Feb '13

11 Feb '13

Hi, I'm releasing my first attempt to cross compile python on android using a simple makefile based build system: https://bitbucket.org/cavallo71/android As side effect it can also build on a gcc based system as (linux so far). The attempt was started in order to simplify the build system and cross compiling modules. In future the hope is to remove distutils package and clear other modules (notably sysconfig.py and site.py). Thanks Antonio

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Jython 2.5.4rc1 and Jython 2.7b1 released!
by Frank Wierzbicki 10 Feb '13

10 Feb '13

On behalf of the Jython development team, I'm pleased to announce that the first release candidate of Jython 2.5.4 and the first beta of Jython 2.7 are available. The 2.5.4rc1 details are here: http://fwierzbicki.blogspot.com/2013/02/jython-254-rc1-released.html The 2.7b1 details are here: http://fwierzbicki.blogspot.com/2013/02/jython-27-beta1-released.html Thanks to Adconion Media Group for sponsoring my work on Jython, and thanks to the many contributors to Jython! -Frank

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pyPEG 2.10 released
by Volker Birk 10 Feb '13

10 Feb '13

Hello, pyPEG 2.10 is a maintenance release. Now optional attributes are supported by the XML backend. There are several bugfixes. pyPEG 2 for Python 2.7 and 3.x Python is a nice scripting language. It even gives you access to its own parser and compiler. It also gives you access to different other parsers for special purposes like XML and string templates. But sometimes you may want to have your own parser. This is what's pyPEG for. And pyPEG supports Unicode. The source code for all you can find on bitbucket: https://bitbucket.org/fdik/pypeg/ To build the documentation, you'll need YML 2. You can download YML here: Homepage: http://fdik.org/yml/ Toolchain: http://fdik.org/yml2.tar.bz2 pyPEG 2 depends on lxml, see http://lxml.de/ Yours, VB. -- “Wer also seinen Anwendern Übles will, sollte unbedingt die Einführung von Windows 8 in Produktivumgebungen forcieren.” Susanne Nolte in der iX

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ANN: NumPy 1.7.0 release
by Ondřej Čertík 10 Feb '13

10 Feb '13

Hi, I'm pleased to announce the availability of the final release of NumPy 1.7.0. Sources and binary installers can be found at https://sourceforge.net/projects/numpy/files/NumPy/1.7.0/ This release is equivalent to the 1.7.0rc2 release, since no more problems were found. For release notes see below. I would like to thank everybody who contributed to this release. Cheers, Ondrej ========================= NumPy 1.7.0 Release Notes ========================= This release includes several new features as well as numerous bug fixes and refactorings. It supports Python 2.4 - 2.7 and 3.1 - 3.3 and is the last release that supports Python 2.4 - 2.5. Highlights ========== * ``where=`` parameter to ufuncs (allows the use of boolean arrays to choose where a computation should be done) * ``vectorize`` improvements (added 'excluded' and 'cache' keyword, general cleanup and bug fixes) * ``numpy.random.choice`` (random sample generating function) Compatibility notes =================== In a future version of numpy, the functions np.diag, np.diagonal, and the diagonal method of ndarrays will return a view onto the original array, instead of producing a copy as they do now. This makes a difference if you write to the array returned by any of these functions. To facilitate this transition, numpy 1.7 produces a FutureWarning if it detects that you may be attempting to write to such an array. See the documentation for np.diagonal for details. Similar to np.diagonal above, in a future version of numpy, indexing a record array by a list of field names will return a view onto the original array, instead of producing a copy as they do now. As with np.diagonal, numpy 1.7 produces a FutureWarning if it detects that you may be attempting to write to such an array. See the documentation for array indexing for details. In a future version of numpy, the default casting rule for UFunc out= parameters will be changed from 'unsafe' to 'same_kind'. (This also applies to in-place operations like a += b, which is equivalent to np.add(a, b, out=a).) Most usages which violate the 'same_kind' rule are likely bugs, so this change may expose previously undetected errors in projects that depend on NumPy. In this version of numpy, such usages will continue to succeed, but will raise a DeprecationWarning. Full-array boolean indexing has been optimized to use a different, optimized code path. This code path should produce the same results, but any feedback about changes to your code would be appreciated. Attempting to write to a read-only array (one with ``arr.flags.writeable`` set to ``False``) used to raise either a RuntimeError, ValueError, or TypeError inconsistently, depending on which code path was taken. It now consistently raises a ValueError. The <ufunc>.reduce functions evaluate some reductions in a different order than in previous versions of NumPy, generally providing higher performance. Because of the nature of floating-point arithmetic, this may subtly change some results, just as linking NumPy to a different BLAS implementations such as MKL can. If upgrading from 1.5, then generally in 1.6 and 1.7 there have been substantial code added and some code paths altered, particularly in the areas of type resolution and buffered iteration over universal functions. This might have an impact on your code particularly if you relied on accidental behavior in the past. New features ============ Reduction UFuncs Generalize axis= Parameter ------------------------------------------- Any ufunc.reduce function call, as well as other reductions like sum, prod, any, all, max and min support the ability to choose a subset of the axes to reduce over. Previously, one could say axis=None to mean all the axes or axis=# to pick a single axis. Now, one can also say axis=(#,#) to pick a list of axes for reduction. Reduction UFuncs New keepdims= Parameter ---------------------------------------- There is a new keepdims= parameter, which if set to True, doesn't throw away the reduction axes but instead sets them to have size one. When this option is set, the reduction result will broadcast correctly to the original operand which was reduced. Datetime support ---------------- .. note:: The datetime API is *experimental* in 1.7.0, and may undergo changes in future versions of NumPy. There have been a lot of fixes and enhancements to datetime64 compared to NumPy 1.6: * the parser is quite strict about only accepting ISO 8601 dates, with a few convenience extensions * converts between units correctly * datetime arithmetic works correctly * business day functionality (allows the datetime to be used in contexts where only certain days of the week are valid) The notes in `doc/source/reference/arrays.datetime.rst <https://github.com/numpy/numpy/blob/maintenance/1.7.x/doc/source/reference/…>`_ (also available in the online docs at `arrays.datetime.html <http://docs.scipy.org/doc/numpy/reference/arrays.datetime.html>`_) should be consulted for more details. Custom formatter for printing arrays ------------------------------------ See the new ``formatter`` parameter of the ``numpy.set_printoptions`` function. New function numpy.random.choice --------------------------------- A generic sampling function has been added which will generate samples from a given array-like. The samples can be with or without replacement, and with uniform or given non-uniform probabilities. New function isclose -------------------- Returns a boolean array where two arrays are element-wise equal within a tolerance. Both relative and absolute tolerance can be specified. Preliminary multi-dimensional support in the polynomial package --------------------------------------------------------------- Axis keywords have been added to the integration and differentiation functions and a tensor keyword was added to the evaluation functions. These additions allow multi-dimensional coefficient arrays to be used in those functions. New functions for evaluating 2-D and 3-D coefficient arrays on grids or sets of points were added together with 2-D and 3-D pseudo-Vandermonde matrices that can be used for fitting. Ability to pad rank-n arrays ---------------------------- A pad module containing functions for padding n-dimensional arrays has been added. The various private padding functions are exposed as options to a public 'pad' function. Example:: pad(a, 5, mode='mean') Current modes are ``constant``, ``edge``, ``linear_ramp``, ``maximum``, ``mean``, ``median``, ``minimum``, ``reflect``, ``symmetric``, ``wrap``, and ``<function>``. New argument to searchsorted ---------------------------- The function searchsorted now accepts a 'sorter' argument that is a permutation array that sorts the array to search. Build system ------------ Added experimental support for the AArch64 architecture. C API ----- New function ``PyArray_RequireWriteable`` provides a consistent interface for checking array writeability -- any C code which works with arrays whose WRITEABLE flag is not known to be True a priori, should make sure to call this function before writing. NumPy C Style Guide added (``doc/C_STYLE_GUIDE.rst.txt``). Changes ======= General ------- The function np.concatenate tries to match the layout of its input arrays. Previously, the layout did not follow any particular reason, and depended in an undesirable way on the particular axis chosen for concatenation. A bug was also fixed which silently allowed out of bounds axis arguments. The ufuncs logical_or, logical_and, and logical_not now follow Python's behavior with object arrays, instead of trying to call methods on the objects. For example the expression (3 and 'test') produces the string 'test', and now np.logical_and(np.array(3, 'O'), np.array('test', 'O')) produces 'test' as well. The ``.base`` attribute on ndarrays, which is used on views to ensure that the underlying array owning the memory is not deallocated prematurely, now collapses out references when you have a view-of-a-view. For example:: a = np.arange(10) b = a[1:] c = b[1:] In numpy 1.6, ``c.base`` is ``b``, and ``c.base.base`` is ``a``. In numpy 1.7, ``c.base`` is ``a``. To increase backwards compatibility for software which relies on the old behaviour of ``.base``, we only 'skip over' objects which have exactly the same type as the newly created view. This makes a difference if you use ``ndarray`` subclasses. For example, if we have a mix of ``ndarray`` and ``matrix`` objects which are all views on the same original ``ndarray``:: a = np.arange(10) b = np.asmatrix(a) c = b[0, 1:] d = c[0, 1:] then ``d.base`` will be ``b``. This is because ``d`` is a ``matrix`` object, and so the collapsing process only continues so long as it encounters other ``matrix`` objects. It considers ``c``, ``b``, and ``a`` in that order, and ``b`` is the last entry in that list which is a ``matrix`` object. Casting Rules ------------- Casting rules have undergone some changes in corner cases, due to the NA-related work. In particular for combinations of scalar+scalar: * the `longlong` type (`q`) now stays `longlong` for operations with any other number (`? b h i l q p B H I`), previously it was cast as `int_` (`l`). The `ulonglong` type (`Q`) now stays as `ulonglong` instead of `uint` (`L`). * the `timedelta64` type (`m`) can now be mixed with any integer type (`b h i l q p B H I L Q P`), previously it raised `TypeError`. For array + scalar, the above rules just broadcast except the case when the array and scalars are unsigned/signed integers, then the result gets converted to the array type (of possibly larger size) as illustrated by the following examples:: >>> (np.zeros((2,), dtype=np.uint8) + np.int16(257)).dtype dtype('uint16') >>> (np.zeros((2,), dtype=np.int8) + np.uint16(257)).dtype dtype('int16') >>> (np.zeros((2,), dtype=np.int16) + np.uint32(2**17)).dtype dtype('int32') Whether the size gets increased depends on the size of the scalar, for example:: >>> (np.zeros((2,), dtype=np.uint8) + np.int16(255)).dtype dtype('uint8') >>> (np.zeros((2,), dtype=np.uint8) + np.int16(256)).dtype dtype('uint16') Also a ``complex128`` scalar + ``float32`` array is cast to ``complex64``. In NumPy 1.7 the `datetime64` type (`M`) must be constructed by explicitly specifying the type as the second argument (e.g. ``np.datetime64(2000, 'Y')``). Deprecations ============ General ------- Specifying a custom string formatter with a `_format` array attribute is deprecated. The new `formatter` keyword in ``numpy.set_printoptions`` or ``numpy.array2string`` can be used instead. The deprecated imports in the polynomial package have been removed. ``concatenate`` now raises DepractionWarning for 1D arrays if ``axis != 0``. Versions of numpy < 1.7.0 ignored axis argument value for 1D arrays. We allow this for now, but in due course we will raise an error. C-API ----- Direct access to the fields of PyArrayObject* has been deprecated. Direct access has been recommended against for many releases. Expect similar deprecations for PyArray_Descr* and other core objects in the future as preparation for NumPy 2.0. The macros in old_defines.h are deprecated and will be removed in the next major release (>= 2.0). The sed script tools/replace_old_macros.sed can be used to replace these macros with the newer versions. You can test your code against the deprecated C API by #defining NPY_NO_DEPRECATED_API to the target version number, for example NPY_1_7_API_VERSION, before including any NumPy headers. The ``NPY_CHAR`` member of the ``NPY_TYPES`` enum is deprecated and will be removed in NumPy 1.8. See the discussion at `gh-2801 <https://github.com/numpy/numpy/issues/2801>`_ for more details. 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[ANN] Leipzig Python User Group - Meeting, February 12, 2013, 08:00 p.m.
by Mike Müller 09 Feb '13

09 Feb '13

=== Leipzig Python User Group === We will meet on Tuesday, February 12 at 8:00 p.m. at the training center of Python Academy in Leipzig, Germany ( http://www.python-academy.com/center/find.html ). Mike Müller (me ;)) will talk about IPython [1] and especially the new IPython notebook. IPython is a greatly enhanced alternative to the interactive Python prompt. The notebook allows to create interactive documents in a browser with markdown, Python code and matplotlib graphics. Even though IPython is traditionally only widely used among scientists, it offers interesting opportunities for all Python users. 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. Food and soft drinks are provided. Please send a short confirmation mail to info(a)python-academy.de, so we can prepare appropriately. Current information about the meetings are at http://www.python-academy.com/user-group . Mike == Leipzig Python User Group === Wir treffen uns am Dienstag, 12.02.2013 um 20:00 Uhr im Schulungszentrum der Python Academy in Leipzig ( http://www.python-academy.de/Schulungszentrum/anfahrt.html ). Mike Müller (das bin ich ;)) stellt IPython [1] und insbesondere das neue IPython-Notebook vor. IPython bietet eine stark erweiterte Alternative zum interaktiven Python-Prompt. Mit dem neuen Notebook lassen sich im Browser interaktive Dokumente mit Markdown, Python-Code und Matplotlib-Grafiken anlegen. Obwohl IPython vor allem im wissenschaftlichen Umfeld verbreitet ist, bietet es interessante Möglichkeiten für alle Python-Nutzer. Weitere Infos: http://www.python-academy.de/User-Group/index.html Willkommen ist jeder, der Interesse an Python hat, die Sprache bereits nutzt oder nutzen möchte. Für das leibliche Wohl wird gesorgt. Eine Anmeldung unter info(a)python-academy.de wäre nett, damit wir genug Essen besorgen können. Aktuelle Informationen zu den Treffen sind unter http://www.python-academy.de/User-Group zu finden. Viele Grüße Mike [1] http://ipython.org/

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