Mailman 3 April 2013 - Python-Dev

Odp: PEP 435 -- Adding an Enum type to the Python standard library
by Jan Kaliszewski April 27, 2013

April 27, 2013

Guido van Rossum wrote: > we'd like to be able to define methods for the enum values, and the simplest way (for the user) to define methods for the enum values would be to allow def statements, possibly decorated, in the class. But now the implementation has to draw a somewhat murky line between which definitions in the class should be interpreted as enum value definitions, and which should be interpreted as method definitions. If we had access to the syntax used for the definition, this would be simple: assignments define items, def statements define methods. But at run time we only see the final object resulting from the definition, which may not even be callable in the case of certain decorators. I am still optimistic that we can come up with a rule that works well enough in practice (and the Zen rule to which I was referring was, of course, "practicality beats purity"). Maybe only names that do *not* start with underscore should be treated as enum value names; and those starting with underscore could be used e.g. to define methods etc.? Python has a long tradition of treating names differently depending of that feature. *j -- Sent from phone...

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Generator finalization and reference cycles
by Antoine Pitrou April 26, 2013

April 26, 2013

Hello, I have proposed a new generator finalization scheme in http://bugs.python.org/issue17807: it removes the tp_del from generator objects, instead electing to cleanup the generator (equivalent of calling close()) in the frame's tp_clean function. This way, generators with a try / finally block can be finalized even when they are part of reference cycles. This has stemmed from http://bugs.python.org/issue17468, which mentions a memory leak in Django due to uncollectable generators. Feedback welcome. Regards Antoine.

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Summary of Python tracker Issues
by Python tracker April 26, 2013

April 26, 2013

ACTIVITY SUMMARY (2013-04-19 - 2013-04-26) Python tracker at http://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 3949 (+21) closed 25674 (+32) total 29623 (+53) Open issues with patches: 1760 Issues opened (43) ================== #16316: Support xz compression in mimetypes module http://bugs.python.org/issue16316 reopened by eric.araujo #17192: libffi-3.0.13 import http://bugs.python.org/issue17192 reopened by r.david.murray #17798: IDLE: can not edit new file names when using -e http://bugs.python.org/issue17798 opened by roger.serwy #17799: settrace docs are wrong about "c_call" events http://bugs.python.org/issue17799 opened by nedbat #17800: Add gc.needs_finalizing() to check if an object needs finalisi http://bugs.python.org/issue17800 opened by ncoghlan #17802: html.HTMLParser raises UnboundLocalError: http://bugs.python.org/issue17802 opened by bmispelon #17803: Calling Tkinter.Tk() with a baseName keyword argument throws U http://bugs.python.org/issue17803 opened by y-fujii #17804: streaming struct unpacking http://bugs.python.org/issue17804 opened by pitrou #17805: No such class: multiprocessing.pool.AsyncResult http://bugs.python.org/issue17805 opened by tkf #17806: Add keyword args support to str/bytes.expandtabs() http://bugs.python.org/issue17806 opened by ezio.melotti #17807: Generator cleanup without tp_del http://bugs.python.org/issue17807 opened by pitrou #17808: No code example for Event object in threading module http://bugs.python.org/issue17808 opened by amysyk #17809: FAIL: test_expanduser when $HOME ends with / http://bugs.python.org/issue17809 opened by koobs #17810: Implement PEP 3154 (pickle protocol 4) http://bugs.python.org/issue17810 opened by alexandre.vassalotti #17811: Improve os.readv() and os.writev() documentation and docstring http://bugs.python.org/issue17811 opened by Nikratio #17812: Quadratic complexity in b32encode http://bugs.python.org/issue17812 opened by serhiy.storchaka #17814: Popen.stdin/stdout/stderr documentation should mention object http://bugs.python.org/issue17814 opened by Nikratio #17816: Weak*Dictionary KeyErrors during callbacks http://bugs.python.org/issue17816 opened by Nils.Bruin #17818: aifc.Aifc_read/Aifc_write.getparams can return a namedtuple http://bugs.python.org/issue17818 opened by Claudiu.Popa #17819: removes need for CONFIG_SITE external configuration http://bugs.python.org/issue17819 opened by cavallo71 #17822: Save on Close windows (IDLE) http://bugs.python.org/issue17822 opened by Guilherme.Simões #17823: 2to3 fixers for missing codecs http://bugs.python.org/issue17823 opened by serhiy.storchaka #17824: pty.spawn handles errors improperly http://bugs.python.org/issue17824 opened by niemeyer #17825: Indentation.offset and SyntaxError.offset mismatch http://bugs.python.org/issue17825 opened by flox #17826: Setting a side_effect on mock from create_autospec doesn't wor http://bugs.python.org/issue17826 opened by michael.foord #17827: Document codecs.encode and codecs.decode http://bugs.python.org/issue17827 opened by ncoghlan #17828: More informative error handling when encoding and decoding http://bugs.python.org/issue17828 opened by ncoghlan #17829: csv.Sniffer.snif doesn't set up the dialect properly for a csv http://bugs.python.org/issue17829 opened by GhislainHivon #17831: urllib.URLopener.open breaks ActiveDirectory user http://bugs.python.org/issue17831 opened by Nataly.Glazyrina #17833: test_gdb broken PPC64 Linux http://bugs.python.org/issue17833 opened by David.Edelsohn #17834: Add Heap (and DynamicHeap) classes to heapq module http://bugs.python.org/issue17834 opened by allyourcode #17837: Support for building on ppc64p7 http://bugs.python.org/issue17837 opened by bkabrda #17838: Can't assign a different value for sys.stdin in IDLE http://bugs.python.org/issue17838 opened by Guilherme.Simões #17839: base64 module should use memoryview http://bugs.python.org/issue17839 opened by ncoghlan #17840: base64_codec uses assert for runtime validity checks http://bugs.python.org/issue17840 opened by ncoghlan #17841: Remove missing aliases from codecs documentation http://bugs.python.org/issue17841 opened by ncoghlan #17842: Add base64 module tests for a bytearray argument http://bugs.python.org/issue17842 opened by serhiy.storchaka #17843: Lib/test/testbz2_bigmem.bz2 trigger virus warnings http://bugs.python.org/issue17843 opened by christian.heimes #17844: Add link to alternatives for bytes-to-bytes codecs http://bugs.python.org/issue17844 opened by serhiy.storchaka #17845: Clarify successful build message http://bugs.python.org/issue17845 opened by brett.cannon #17846: Building Python on Windows - Supplementary info http://bugs.python.org/issue17846 opened by michael.kearney #17848: issue about compile with clang and build a shared lib http://bugs.python.org/issue17848 opened by matrixsystem #17849: Missing size argument in readline() method for httplib's class http://bugs.python.org/issue17849 opened by stamparm Most recent 15 issues with no replies (15) ========================================== #17848: issue about compile with clang and build a shared lib http://bugs.python.org/issue17848 #17846: Building Python on Windows - Supplementary info http://bugs.python.org/issue17846 #17844: Add link to alternatives for bytes-to-bytes codecs http://bugs.python.org/issue17844 #17841: Remove missing aliases from codecs documentation http://bugs.python.org/issue17841 #17840: base64_codec uses assert for runtime validity checks http://bugs.python.org/issue17840 #17829: csv.Sniffer.snif doesn't set up the dialect properly for a csv http://bugs.python.org/issue17829 #17824: pty.spawn handles errors improperly http://bugs.python.org/issue17824 #17819: removes need for CONFIG_SITE external configuration http://bugs.python.org/issue17819 #17818: aifc.Aifc_read/Aifc_write.getparams can return a namedtuple http://bugs.python.org/issue17818 #17809: FAIL: test_expanduser when $HOME ends with / http://bugs.python.org/issue17809 #17806: Add keyword args support to str/bytes.expandtabs() http://bugs.python.org/issue17806 #17805: No such class: multiprocessing.pool.AsyncResult http://bugs.python.org/issue17805 #17799: settrace docs are wrong about "c_call" events http://bugs.python.org/issue17799 #17798: IDLE: can not edit new file names when using -e http://bugs.python.org/issue17798 #17791: PC/pyconfig.h defines PREFIX macro http://bugs.python.org/issue17791 Most recent 15 issues waiting for review (15) ============================================= #17844: Add link to alternatives for bytes-to-bytes codecs http://bugs.python.org/issue17844 #17842: Add base64 module tests for a bytearray argument http://bugs.python.org/issue17842 #17839: base64 module should use memoryview http://bugs.python.org/issue17839 #17838: Can't assign a different value for sys.stdin in IDLE http://bugs.python.org/issue17838 #17837: Support for building on ppc64p7 http://bugs.python.org/issue17837 #17834: Add Heap (and DynamicHeap) classes to heapq module http://bugs.python.org/issue17834 #17833: test_gdb broken PPC64 Linux http://bugs.python.org/issue17833 #17826: Setting a side_effect on mock from create_autospec doesn't wor http://bugs.python.org/issue17826 #17822: Save on Close windows (IDLE) http://bugs.python.org/issue17822 #17819: removes need for CONFIG_SITE external configuration http://bugs.python.org/issue17819 #17818: aifc.Aifc_read/Aifc_write.getparams can return a namedtuple http://bugs.python.org/issue17818 #17812: Quadratic complexity in b32encode http://bugs.python.org/issue17812 #17810: Implement PEP 3154 (pickle protocol 4) http://bugs.python.org/issue17810 #17808: No code example for Event object in threading module http://bugs.python.org/issue17808 #17807: Generator cleanup without tp_del http://bugs.python.org/issue17807 Top 10 most discussed issues (10) ================================= #7475: codecs missing: base64 bz2 hex zlib hex_codec ... http://bugs.python.org/issue7475 24 msgs #17468: Generator memory leak http://bugs.python.org/issue17468 17 msgs #17845: Clarify successful build message http://bugs.python.org/issue17845 16 msgs #17804: streaming struct unpacking http://bugs.python.org/issue17804 15 msgs #15392: Create a unittest framework for IDLE http://bugs.python.org/issue15392 9 msgs #17646: traceback.py has a lot of code duplication http://bugs.python.org/issue17646 8 msgs #17822: Save on Close windows (IDLE) http://bugs.python.org/issue17822 8 msgs #17833: test_gdb broken PPC64 Linux http://bugs.python.org/issue17833 8 msgs #17742: Add _PyBytesWriter API http://bugs.python.org/issue17742 7 msgs #17800: Add gc.needs_finalizing() to check if an object needs finalisi http://bugs.python.org/issue17800 7 msgs Issues closed (31) ================== #9607: Test file 'test_keyword.py' submission for use with keyword.py http://bugs.python.org/issue9607 closed by r.david.murray #11714: threading.Semaphore does not use try...finally http://bugs.python.org/issue11714 closed by serhiy.storchaka #12825: Missing and incorrect link to a command line option. http://bugs.python.org/issue12825 closed by eric.araujo #15575: Tutorial is unclear on multiple imports of a module. http://bugs.python.org/issue15575 closed by r.david.murray #15642: Integrate pickle protocol version 4 GSoC work by Stefan Mihail http://bugs.python.org/issue15642 closed by alexandre.vassalotti #16347: configure.ac patch http://bugs.python.org/issue16347 closed by cavallo71 #16624: subprocess.check_output should allow specifying stdin as a str http://bugs.python.org/issue16624 closed by serhiy.storchaka #16694: Add pure Python operator module http://bugs.python.org/issue16694 closed by pitrou #16942: urllib still doesn't support persistent connections http://bugs.python.org/issue16942 closed by orsenthil #17065: Fix sporadic buildbot failures for test_winreg http://bugs.python.org/issue17065 closed by r.david.murray #17353: Plistlib outputs empty data tags when deeply nested http://bugs.python.org/issue17353 closed by ronaldoussoren #17409: resource.setrlimit doesn't respect -1 http://bugs.python.org/issue17409 closed by r.david.murray #17413: format_exception() breaks on exception tuples from trace funct http://bugs.python.org/issue17413 closed by r.david.murray #17720: pickle.py's load_appends should call append() on objects other http://bugs.python.org/issue17720 closed by alexandre.vassalotti #17729: advocacy howto improvements http://bugs.python.org/issue17729 closed by ezio.melotti #17736: Misleading method comment in _elementtree.c : get_attrib_from_ http://bugs.python.org/issue17736 closed by eli.bendersky #17785: Use faster URL shortener for perf.py http://bugs.python.org/issue17785 closed by alexandre.vassalotti #17795: backwards-incompatible change in SysLogHandler with unix domai http://bugs.python.org/issue17795 closed by python-dev #17796: No mimetype guessed for tar.xz url http://bugs.python.org/issue17796 closed by eric.araujo #17801: Tools/scripts/gprof2html.py: `#! /usr/bin/env python32.3` http://bugs.python.org/issue17801 closed by ned.deily #17813: lzma and bz2 decompress methods lack max_size parameter http://bugs.python.org/issue17813 closed by ezio.melotti #17815: itertools.combinations example is overly complicated http://bugs.python.org/issue17815 closed by Theodoros.Ikonomou #17817: ¿Bug Python 2.7.4 and version 3.3.1? http://bugs.python.org/issue17817 closed by roger.serwy #17820: Nothing about editors in "Key Resources" http://bugs.python.org/issue17820 closed by ned.deily #17821: Different division results with / and // operators with large http://bugs.python.org/issue17821 closed by sbt #17830: keyword.py main does not preserve line endings when rewriting http://bugs.python.org/issue17830 closed by r.david.murray #17832: pythonrun.c:_print_total_refs missing prototype http://bugs.python.org/issue17832 closed by pitrou #17835: test_io broken on PPC64 Linux http://bugs.python.org/issue17835 closed by pitrou #17836: multiprocessing exceptions with useful traceback http://bugs.python.org/issue17836 closed by sbt #17847: Glossary lacks permalinks http://bugs.python.org/issue17847 closed by pitrou #17850: unicode_escape encoding fails for '\\Upsilon' http://bugs.python.org/issue17850 closed by ezio.melotti

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NoneType(None) raises exception
by Ethan Furman April 26, 2013

April 26, 2013

We just fixed NoneType() to return None instead of raising an exception. Another use-case for calling NoneType is working with ORMs: result = [] for field in row: type = get_type(field) # returns int, bool, str, NoneType, ... result.append(type(field)) if field is None, the resulting call is NoneType(None), and since NoneType doesn't take any parameters we get an exception. Is it worth filing a bug to have NoneType accept one optional argument, which defaults to None, and must be None, else raise an exception? Or should it be: class NoneType: def __new__(cls, *args, **kws): return None Which is basically what my 2.x none() helper function does... -- ~Ethan~

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Why can't I encode/decode base64 without importing a module?
by Ram Rachum April 25, 2013

April 25, 2013

Hi everyone, Take a look at this question: http://stackoverflow.com/questions/16122435/python-3-how-do-i-use-bytes-to-… Is there really no way to use base64 that's as short as: b'whatever'.encode('base64') Because doing this: import codecs codecs.decode(b"whatever", "base64_codec") Or this: import base64 encoded = base64.b64encode(b'whatever') Is cumbersome! Why can't I do something like b'whatever'.encode('base64')? Or maybe using a different method than `encode`? Thanks, Ram.

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A decade as a core dev
by Brett Cannon April 25, 2013

April 25, 2013

Today marks my 10 year anniversary as a core developer on Python. I wrote a blog post to mark the occasion (http://sayspy.blogspot.ca/2013/04/a-decade-of-commits.html), but I wanted to personally thank python-dev for the past decade (and whatever comes in the future). All of you taught me how to really program and for that I will be eternally grateful. And the friendships I have built through this list are priceless.

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slow hg clone of python repo?
by Sean Felipe Wolfe April 25, 2013

April 25, 2013

Hey everybody, I'm trying to download the python sources with hg and it's taking a while ... 7+ minutes so far and all I've got is .../cpython and .../cypython/.hg . Any ideas as to why there's a delay? I'm following the dev guide with this command: hg clone http://hg.python.org/cpython I'm on Linux Mint 14, using the supplied hg version 2.2.2 . My internet connection seems speedy enough. TIA! Sean -- A musician must make music, an artist must paint, a poet must write, if he is to be ultimately at peace with himself. - Abraham Maslow

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I cannot create bug reports
by Daniel Wong April 24, 2013

April 24, 2013

Glorious members of python-dev, I'd like to submit a patch, but I cannot create a bug report. As of this morning (US West Coast), when I go to http://bugs.python.org/issue?@template=item I get no form fields. I went there last night, and I was able to get a form. I kept that tab open over night, and tried to submit this morning. When I did that, I got permission denied errors. It seems that something weird has happened to my account, or bug tracker itself changed in my sleep. Anyone have any idea what's going on here? Daniel

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Re: [Python-Dev] [Python-checkins] cpython (3.3): backported rev 79713 from 3.4, test_recursion_limit skipped for -O0
by Ronald Oussoren April 24, 2013

April 24, 2013

On 24 Apr, 2013, at 1:32, "lukasz.langa" <python-checkins(a)python.org> wrote: > http://hg.python.org/cpython/rev/9755036c81d0 > changeset: 83510:9755036c81d0 > branch: 3.3 > parent: 83508:44d764238f0d > user: Łukasz Langa <lukasz(a)langa.pl> > date: Wed Apr 24 01:29:26 2013 +0200 > summary: > backported rev 79713 from 3.4, test_recursion_limit skipped for -O0 > > files: > Lib/test/test_threading.py | 3 ++- > 1 files changed, 2 insertions(+), 1 deletions(-) > > > diff --git a/Lib/test/test_threading.py b/Lib/test/test_threading.py > --- a/Lib/test/test_threading.py > +++ b/Lib/test/test_threading.py > @@ -754,7 +754,8 @@ > lock = threading.Lock() > self.assertRaises(RuntimeError, lock.release) > > - @unittest.skipUnless(sys.platform == 'darwin', 'test macosx problem') > + @unittest.skipUnless(sys.platform == 'darwin' and test.support.python_is_optimized(), > + 'test macosx problem') Wouldn't it be better to just fix the issue? thread_pthread already sets an explicit stack size on OSX, but that value is appearently too small. Ronald

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distutils, win32, multiple C extensions
by Emmanuel Bacry April 23, 2013

April 23, 2013

Hello, I am a researcher in Applied Math. For my work I write a lot of code and right now I am moving to python. I am writing some C extensions (using swig). I wrote a first extension (a python module) which I'll call E1. I wrote a setup.py which works fine on all platforms. On Windows 7 it creates a library which is a .pyd file Now I want to write a second C extension E2 that is calling some functions of E1. The same kind of setup.py works fine on all platforms but Windows where it says (during the link) that the function sof E1 that are called by E2 are unreferenced. I am clearly not a Windows pro ... I am using mingw32 on Windows. Surfing the web, I understood that shared libraries work differently on windows than on other platforms. And that I should 1- export the symbols (i.e., the functions) of E1 when I build E1. In the distutils.Extension this seems to be done using argument export_symbols=[list of symbols to export] Now I have one problem : each time I specify in this list the name of a function in E1 it says that it doesn't know this symbol What am I doing wrong here, is there a special syntax ? 2- Now in the setup.py of E2 how do I declare that I want to use the E1 shared lib.? Is the information on the exported symbol of E1 in the .pyd file or in the .def file ? I tried to specify the .pyd library in the arguments of the distutils.Extension .... but I have the feeling that's not the right thing to do (I have the feeling the .pyd is not the right file to point to) Not mentioning the problem specifying the path of the library with runtime_library_dirs ... which does not seem to work at all. Is there a simple way to do what I want to do ? I did not find anything on the web explaining clearly what to do ... I am really really stuck I would appreciate any kind of help Emmanuel

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