Python-Dev August 2012

python-dev@python.org

81 participants
77 discussions

What's New in Python 3.3
by Raymond Hettinger 13 Aug '12

13 Aug '12

Hello all, I'll soon be starting the edits of Whatsnew for 3.3. When I did this for 3.2, it took over 150 hours of work to research all the changes. This time there are many more changes, so my previous process won't work (reviewing every "new in 3.3" entry in the docs, every entry in the voluminous Misc/NEWS file, etc). You can help out by checking-in draft entries for your favorite new features. That way, I can avoid the time consuming curation step and focus on the text, organization, and examples. I appreciate your help, Raymond

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[RELEASED] Python 3.3.0 beta 2
by Georg Brandl 12 Aug '12

12 Aug '12

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On behalf of the Python development team, I'm happy to announce the second beta release of Python 3.3.0 -- a little later than originally scheduled, but much better for it. This is a preview release, and its use is not recommended in production settings. Python 3.3 includes a range of improvements of the 3.x series, as well as easier porting between 2.x and 3.x. Major new features and changes in the 3.3 release series are: * PEP 380, syntax for delegating to a subgenerator ("yield from") * PEP 393, flexible string representation (doing away with the distinction between "wide" and "narrow" Unicode builds) * A C implementation of the "decimal" module, with up to 80x speedup for decimal-heavy applications * The import system (__import__) now based on importlib by default * The new "lzma" module with LZMA/XZ support * PEP 397, a Python launcher for Windows * PEP 405, virtual environment support in core * PEP 420, namespace package support * PEP 3151, reworking the OS and IO exception hierarchy * PEP 3155, qualified name for classes and functions * PEP 409, suppressing exception context * PEP 414, explicit Unicode literals to help with porting * PEP 418, extended platform-independent clocks in the "time" module * PEP 412, a new key-sharing dictionary implementation that significantly saves memory for object-oriented code * PEP 362, the function-signature object * The new "faulthandler" module that helps diagnosing crashes * The new "unittest.mock" module * The new "ipaddress" module * The "sys.implementation" attribute * A policy framework for the email package, with a provisional (see PEP 411) policy that adds much improved unicode support for email header parsing * A "collections.ChainMap" class for linking mappings to a single unit * Wrappers for many more POSIX functions in the "os" and "signal" modules, as well as other useful functions such as "sendfile()" * Hash randomization, introduced in earlier bugfix releases, is now switched on by default In total, almost 500 API items are new or improved in Python 3.3. For a more extensive list of changes in 3.3.0, see http://docs.python.org/3.3/whatsnew/3.3.html (*) To download Python 3.3.0 visit: http://www.python.org/download/releases/3.3.0/ Please consider trying Python 3.3.0 with your code and reporting any bugs you may notice to: http://bugs.python.org/ Enjoy! (*) Please note that this document is usually finalized late in the release cycle and therefore may have stubs and missing entries at this point. - -- Georg Brandl, Release Manager georg at python.org (on behalf of the entire python-dev team and 3.3's contributors) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (GNU/Linux) iEYEARECAAYFAlAnxVAACgkQN9GcIYhpnLAECACcDeE+N2AfYVnuwMkq682znfDU ODAAn0J87+MVA9WHEV5iYZd3ub9ZhbpC =LvY0 -----END PGP SIGNATURE-----

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Re: [Python-Dev] [Python-checkins] cpython (3.2): zip() returns an iterator, make a list() of it; thanks to Martin from docs@
by Chris Jerdonek 12 Aug '12

12 Aug '12

On Sun, Aug 12, 2012 at 1:25 AM, sandro.tosi <python-checkins(a)python.org> wrote: > http://hg.python.org/cpython/rev/233673503217 > changeset: 78512:233673503217 > user: Sandro Tosi <sandro.tosi(a)gmail.com> > date: Sun Aug 12 10:24:50 2012 +0200 > summary: > zip() returns an iterator, make a list() of it; thanks to Martin from docs@ > diff --git a/Doc/tutorial/datastructures.rst b/Doc/tutorial/datastructures.rst > - >>> zip(*matrix) > + >>> list(zip(*matrix)) > [(1, 5, 9), (2, 6, 10), (3, 7, 11), (4, 8, 12)] Is there a reason we don't run the doctests in the Doc/ folder's .rst files as part of regrtest (e.g. via DocFileSuite), or is that something we just haven't gotten around to doing? --Chris

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Re: [Python-Dev] [Python-checkins] cpython: Issue #15502: Finish bringing importlib.abc in line with the current
by Chris Jerdonek 11 Aug '12

11 Aug '12

On Fri, Aug 10, 2012 at 9:21 AM, brett.cannon <python-checkins(a)python.org> wrote: > http://hg.python.org/cpython/rev/0a75ce232f56 > changeset: 78485:0a75ce232f56 > user: Brett Cannon <brett(a)python.org> > date: Fri Aug 10 12:21:12 2012 -0400 > summary: > Issue #15502: Finish bringing importlib.abc in line with the current > + cache used by the finder. Used by :func:`invalidate_caches()` when Minor style nit: the Dev Guide says not to include the trailing parentheses in :func: text: "func: The name of a Python function; dotted names may be used. The role text should not include trailing parentheses to enhance readability..." (from http://hg.python.org/devguide/file/f518f23d06d5/documenting.rst#l888 ) (though I don't know why the Dev Guide says the opposite for :c:func: and is silent on :meth:.) On a related note: this may not be common knowledge, but it is possible to hyperlink to a function definition while still showing different text (in particular passed arguments) by using the following Sphinx syntax: :func:`locale.getpreferredencoding(False) <locale.getpreferredencoding>` This is in the Dev Guide, but I haven't seen the construct used in many places where it seems like it would be helpful and appropriate. --Chris

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Re: [Python-Dev] [Python-checkins] cpython: update docstring per the extension package fix, refactor
by Eric Snow 10 Aug '12

10 Aug '12

On Fri, Aug 10, 2012 at 2:17 PM, philip.jenvey <python-checkins(a)python.org> wrote: > http://hg.python.org/cpython/rev/e024f6ba5ed8 > changeset: 78487:e024f6ba5ed8 > user: Philip Jenvey <pjenvey(a)underboss.org> > date: Fri Aug 10 11:53:54 2012 -0700 > summary: > update docstring per the extension package fix, refactor > > files: > Lib/importlib/_bootstrap.py | 9 +- > Python/importlib.h | 3353 +++++++++++----------- > 2 files changed, 1685 insertions(+), 1677 deletions(-) > > > diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py > --- a/Lib/importlib/_bootstrap.py > +++ b/Lib/importlib/_bootstrap.py > @@ -1102,13 +1102,10 @@ > raise > > def is_package(self, fullname): > - """Return False as an extension module can never be a package.""" > + """Return if the extension module is a package.""" s/Return if/Return True if/ -eric

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Tests of of 2.7 tip on Ubuntu 12.04 amd64
by "Juancarlo Añez (Apalala)" 10 Aug '12

10 Aug '12

Hello, Please let me know if this is normal: 1 test failed: test_readline 1 test altered the execution environment: test_subprocess 32 tests skipped: test_aepack test_al test_applesingle test_bsddb test_bsddb185 test_bsddb3 test_cd test_cl test_curses test_dl test_gl test_imageop test_imgfile test_kqueue test_linuxaudiodev test_macos test_macostools test_msilib test_ossaudiodev test_scriptpackages test_smtpnet test_socketserver test_startfile test_sunaudiodev test_timeout test_tk test_ttk_guionly test_urllib2net test_urllibnet test_winreg test_winsound test_zipfile64 2 skips unexpected on linux2: test_bsddb test_bsddb3 Thanks in advance, -- Juancarlo

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Summary of Python tracker Issues
by Python tracker 10 Aug '12

10 Aug '12

ACTIVITY SUMMARY (2012-08-03 - 2012-08-10) 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 3588 (+24) closed 23808 (+44) total 27396 (+68) Open issues with patches: 1543 Issues opened (47) ================== #13072: Getting a buffer from a Unicode array uses invalid format http://bugs.python.org/issue13072 reopened by haypo #15527: Double parens in functions references http://bugs.python.org/issue15527 reopened by storchaka #15552: gettext: if looking for .mo in default locations, also look in http://bugs.python.org/issue15552 opened by Dominique.Leuenberger #15553: Segfault in test_6_daemon_threads() of test_threading, on Mac http://bugs.python.org/issue15553 opened by haypo #15555: Default newlines of io.TextIOWrapper http://bugs.python.org/issue15555 opened by ishimoto #15556: os.stat fails for file pending delete on Windows http://bugs.python.org/issue15556 opened by jkloth #15557: Tests for webbrowser module http://bugs.python.org/issue15557 opened by anton.barkovsky #15561: update subprocess docs to reference io.TextIOWrapper http://bugs.python.org/issue15561 opened by cjerdonek #15564: cgi.FieldStorage should not call read_multi on files http://bugs.python.org/issue15564 opened by patrick.vrijlandt #15566: tarfile.TarInfo.frombuf documentation is out of date http://bugs.python.org/issue15566 opened by sebastinas #15569: Doc doc: incorrect description of some roles as format-only http://bugs.python.org/issue15569 opened by cjerdonek #15570: email.header.decode_header parses differently http://bugs.python.org/issue15570 opened by ddvoinikov #15571: Python version of TextIOWrapper ignores "write_through" arg http://bugs.python.org/issue15571 opened by ncoghlan #15573: Support unknown formats in memoryview comparisons http://bugs.python.org/issue15573 opened by skrah #15574: IDLE crashes using clipboard copy command on OS X with ActiveT http://bugs.python.org/issue15574 opened by Leon.Maurer #15575: Tutorial is unclear on multiple imports of a module. http://bugs.python.org/issue15575 opened by roysmith #15576: importlib: ExtensionFileLoader not used to load packages from http://bugs.python.org/issue15576 opened by scoder #15577: Real argc and argv in embedded interpreter http://bugs.python.org/issue15577 opened by nordaux #15578: Crash when modifying sys.modules during import http://bugs.python.org/issue15578 opened by twouters #15581: curses: segfault in addstr() http://bugs.python.org/issue15581 opened by hut #15582: Enhance inspect.getdoc to follow inheritance chains http://bugs.python.org/issue15582 opened by ncoghlan #15586: Provide some examples for usage of ElementTree methods/attribu http://bugs.python.org/issue15586 opened by Sarbjit.singh #15588: quopri: encodestring and decodestring handle bytes, not string http://bugs.python.org/issue15588 opened by patrick.vrijlandt #15589: Bus error on Debian sparc http://bugs.python.org/issue15589 opened by skrah #15590: --libs is inconsistent for python-config --libs and pkgconfig http://bugs.python.org/issue15590 opened by doko #15591: when building the extensions, stdout is lost when stdout is re http://bugs.python.org/issue15591 opened by doko #15592: subprocess.communicate() breaks on no input with universal new http://bugs.python.org/issue15592 opened by cjerdonek #15593: urlparse.parse_qs documentation wrong re: urlencode http://bugs.python.org/issue15593 opened by Rob.Kinyon #15594: test_copyfile_named_pipe() fails on Mac OS X Snow Leopard: OSE http://bugs.python.org/issue15594 opened by haypo #15595: subprocess.Popen(universal_newlines=True) does not work for ce http://bugs.python.org/issue15595 opened by cjerdonek #15596: pickle: Faster serialization of Unicode strings http://bugs.python.org/issue15596 opened by haypo #15599: test_circular_imports() of test_threaded_import fails on FreeB http://bugs.python.org/issue15599 opened by haypo #15600: expose the finder details used by the FileFinder path hook http://bugs.python.org/issue15600 opened by eric.snow #15604: PyObject_IsTrue failure checks http://bugs.python.org/issue15604 opened by storchaka #15605: Explain sphinx documentation building in devguide http://bugs.python.org/issue15605 opened by Daniel.Ellis #15606: re.VERBOSE doesn't ignore certain whitespace http://bugs.python.org/issue15606 opened by stevencollins #15607: New print's argument "flush" is not mentioned in docstring http://bugs.python.org/issue15607 opened by storchaka #15608: Improve socketserver doc http://bugs.python.org/issue15608 opened by terry.reedy #15609: Format string: add more fast-path http://bugs.python.org/issue15609 opened by haypo #15610: PyImport_ImportModuleEx always fails in 3.3 with "ValueError: http://bugs.python.org/issue15610 opened by dmalcolm #15611: devguide: add "core mentors" area to Experts Index http://bugs.python.org/issue15611 opened by cjerdonek #15612: Rewrite StringIO to use the _PyUnicodeWriter API http://bugs.python.org/issue15612 opened by haypo #15613: argparse ArgumentDefaultsHelpFormatter interacts badly with -- http://bugs.python.org/issue15613 opened by aj #15615: More tests for JSON decoder to test Exceptions http://bugs.python.org/issue15615 opened by kushaldas #15616: logging.FileHandler not correctly created with PyYaml (unpickl http://bugs.python.org/issue15616 opened by jordipf #15617: FAIL: test_create_connection (test.test_socket.NetworkConnecti http://bugs.python.org/issue15617 opened by flub #15618: turtle.pencolor() chokes on unicode http://bugs.python.org/issue15618 opened by apalala Most recent 15 issues with no replies (15) ========================================== #15618: turtle.pencolor() chokes on unicode http://bugs.python.org/issue15618 #15615: More tests for JSON decoder to test Exceptions http://bugs.python.org/issue15615 #15613: argparse ArgumentDefaultsHelpFormatter interacts badly with -- http://bugs.python.org/issue15613 #15609: Format string: add more fast-path http://bugs.python.org/issue15609 #15606: re.VERBOSE doesn't ignore certain whitespace http://bugs.python.org/issue15606 #15593: urlparse.parse_qs documentation wrong re: urlencode http://bugs.python.org/issue15593 #15591: when building the extensions, stdout is lost when stdout is re http://bugs.python.org/issue15591 #15588: quopri: encodestring and decodestring handle bytes, not string http://bugs.python.org/issue15588 #15582: Enhance inspect.getdoc to follow inheritance chains http://bugs.python.org/issue15582 #15581: curses: segfault in addstr() http://bugs.python.org/issue15581 #15577: Real argc and argv in embedded interpreter http://bugs.python.org/issue15577 #15569: Doc doc: incorrect description of some roles as format-only http://bugs.python.org/issue15569 #15566: tarfile.TarInfo.frombuf documentation is out of date http://bugs.python.org/issue15566 #15564: cgi.FieldStorage should not call read_multi on files http://bugs.python.org/issue15564 #15557: Tests for webbrowser module http://bugs.python.org/issue15557 Most recent 15 issues waiting for review (15) ============================================= #15615: More tests for JSON decoder to test Exceptions http://bugs.python.org/issue15615 #15612: Rewrite StringIO to use the _PyUnicodeWriter API http://bugs.python.org/issue15612 #15610: PyImport_ImportModuleEx always fails in 3.3 with "ValueError: http://bugs.python.org/issue15610 #15609: Format string: add more fast-path http://bugs.python.org/issue15609 #15607: New print's argument "flush" is not mentioned in docstring http://bugs.python.org/issue15607 #15605: Explain sphinx documentation building in devguide http://bugs.python.org/issue15605 #15604: PyObject_IsTrue failure checks http://bugs.python.org/issue15604 #15600: expose the finder details used by the FileFinder path hook http://bugs.python.org/issue15600 #15596: pickle: Faster serialization of Unicode strings http://bugs.python.org/issue15596 #15595: subprocess.Popen(universal_newlines=True) does not work for ce http://bugs.python.org/issue15595 #15590: --libs is inconsistent for python-config --libs and pkgconfig http://bugs.python.org/issue15590 #15589: Bus error on Debian sparc http://bugs.python.org/issue15589 #15586: Provide some examples for usage of ElementTree methods/attribu http://bugs.python.org/issue15586 #15573: Support unknown formats in memoryview comparisons http://bugs.python.org/issue15573 #15571: Python version of TextIOWrapper ignores "write_through" arg http://bugs.python.org/issue15571 Top 10 most discussed issues (10) ================================= #15510: textwrap.wrap('') returns empty list http://bugs.python.org/issue15510 22 msgs #15589: Bus error on Debian sparc http://bugs.python.org/issue15589 19 msgs #13072: Getting a buffer from a Unicode array uses invalid format http://bugs.python.org/issue13072 17 msgs #14814: Implement PEP 3144 (the ipaddress module) http://bugs.python.org/issue14814 12 msgs #15586: Provide some examples for usage of ElementTree methods/attribu http://bugs.python.org/issue15586 12 msgs #15216: Support setting the encoding on a text stream after creation http://bugs.python.org/issue15216 10 msgs #15573: Support unknown formats in memoryview comparisons http://bugs.python.org/issue15573 10 msgs #15595: subprocess.Popen(universal_newlines=True) does not work for ce http://bugs.python.org/issue15595 10 msgs #15424: __sizeof__ of array should include size of items http://bugs.python.org/issue15424 8 msgs #15527: Double parens in functions references http://bugs.python.org/issue15527 8 msgs Issues closed (43) ================== #5819: Add PYTHONPREFIXES environment variable http://bugs.python.org/issue5819 closed by asvetlov #13052: IDLE: replace ending with '\' causes crash http://bugs.python.org/issue13052 closed by asvetlov #13119: Newline for print() is \n on Windows, and not \r\n as expected http://bugs.python.org/issue13119 closed by python-dev #14182: collections.Counter equality test thrown-off by zero counts http://bugs.python.org/issue14182 closed by rhettinger #14966: Fully document subprocess.CalledProcessError http://bugs.python.org/issue14966 closed by asvetlov #15077: Regexp match goes into infinite loop http://bugs.python.org/issue15077 closed by storchaka #15163: pydoc displays __loader__ as module data http://bugs.python.org/issue15163 closed by brett.cannon #15202: followlinks/follow_symlinks/symlinks flags unification http://bugs.python.org/issue15202 closed by storchaka #15365: Traceback reporting can fail if IO cannot be imported http://bugs.python.org/issue15365 closed by kristjan.jonsson #15471: importlib's __import__() argument style nit http://bugs.python.org/issue15471 closed by brett.cannon #15482: __import__() change between 3.2 and 3.3 http://bugs.python.org/issue15482 closed by brett.cannon #15492: textwrap.wrap expand_tabs does not behave as expected http://bugs.python.org/issue15492 closed by r.david.murray #15501: Document exception classes in subprocess module http://bugs.python.org/issue15501 closed by asvetlov #15530: Enhance Py_MIN and Py_MAX http://bugs.python.org/issue15530 closed by loewis #15531: os.path symlink docs missing http://bugs.python.org/issue15531 closed by larry #15536: re.split doesn't respect MULTILINE http://bugs.python.org/issue15536 closed by r.david.murray #15541: logging.exception doesn't accept 'extra' http://bugs.python.org/issue15541 closed by vinay.sajip #15546: Iteration breaks with bz2.open(filename,'rt') http://bugs.python.org/issue15546 closed by nadeem.vawda #15547: Why do we have os.truncate() and os.ftruncate() whereas os.tru http://bugs.python.org/issue15547 closed by larry #15550: Trailing white spaces http://bugs.python.org/issue15550 closed by ned.deily #15551: Unit tests that return generators silently fail http://bugs.python.org/issue15551 closed by michael.foord #15554: correct and clarify str.splitlines() documentation http://bugs.python.org/issue15554 closed by r.david.murray #15558: webbrowser output to console http://bugs.python.org/issue15558 closed by r.david.murray #15559: Bad interaction between ipaddress addresses and the bytes cons http://bugs.python.org/issue15559 closed by python-dev #15560: _sqlite3.so is built with wrong include file on OS X when usin http://bugs.python.org/issue15560 closed by ned.deily #15562: CaseFolding not working properly http://bugs.python.org/issue15562 closed by benjamin.peterson #15563: wrong conversion reported by http://bugs.python.org/issue15563 closed by loewis #15565: pdb displays runt Exception strings http://bugs.python.org/issue15565 closed by r.david.murray #15567: threading.py contains undefined name in self-test code http://bugs.python.org/issue15567 closed by brian.curtin #15568: yield from missed StopIteration raised from iterator instead o http://bugs.python.org/issue15568 closed by python-dev #15572: Python2 documentation of the file() built-in function http://bugs.python.org/issue15572 closed by python-dev #15579: some unicode keys not found using in dictionary.keys() http://bugs.python.org/issue15579 closed by r.david.murray #15580: fix True/False/None reST markup http://bugs.python.org/issue15580 closed by georg.brandl #15583: Provide examples in Python doc for usage of various modules http://bugs.python.org/issue15583 closed by r.david.murray #15584: os.popen deprecation warning not in Python 3 docs http://bugs.python.org/issue15584 closed by r.david.murray #15585: usage of os.popen in standard library http://bugs.python.org/issue15585 closed by r.david.murray #15587: IDLE is pixelated on the Macbook Pro with Retina Display http://bugs.python.org/issue15587 closed by ned.deily #15597: exception __suppress_context__ test failures on OS X ppc syste http://bugs.python.org/issue15597 closed by python-dev #15598: relative import unexpectedly binds name http://bugs.python.org/issue15598 closed by benjamin.peterson #15601: tkinter test_variables fails with OS X Aqua Tk 8.4 http://bugs.python.org/issue15601 closed by asvetlov #15602: zipfile: wrong encoding charset of member filename http://bugs.python.org/issue15602 closed by loewis #15603: Multiprocessing creates incorrect pids http://bugs.python.org/issue15603 closed by cfriedline #15614: print statement not showing valid result http://bugs.python.org/issue15614 closed by loewis

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SPARC testers (and buildbot!) needed
by Stefan Krah 10 Aug '12

10 Aug '12

Hello, currently the only cheap way for developers to test on SPARC that I'm aware of is using this old Debian qemu image: http://people.debian.org/~aurel32/qemu/sparc/ That image still uses linuxthreads and may contain any number of platform bugs. It is currently impossible to run the test suite without bus errors, see: http://bugs.python.org/issue15589 Could someone with access to a SPARC machine (perhaps with a modern version of Debian-sparc) grab a clone from http://hg.python.org/cpython/ and run the test suite? Also, it would be really nice if someone could donate a SPARC buildbot. Stefan Krah

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python 3.3 b2
by Yury Selivanov 10 Aug '12

10 Aug '12

Hi all, What's the status of Python 3.3 beta 2? Thanks, Yury

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Re: [Python-Dev] [Python-checkins] peps: 3.3 schedule update.
by Eli Bendersky 09 Aug '12

09 Aug '12

Awesome, thanks! On Thu, Aug 9, 2012 at 9:47 PM, georg.brandl <python-checkins(a)python.org>wrote: > http://hg.python.org/peps/rev/fdf8b99178c4 > changeset: 4497:fdf8b99178c4 > user: Georg Brandl <georg(a)python.org> > date: Thu Aug 09 20:48:06 2012 +0200 > summary: > 3.3 schedule update. > > files: > pep-0398.txt | 8 ++++---- > 1 files changed, 4 insertions(+), 4 deletions(-) > > > diff --git a/pep-0398.txt b/pep-0398.txt > --- a/pep-0398.txt > +++ b/pep-0398.txt > @@ -42,10 +42,10 @@ > > (No new features beyond this point.) > > -- 3.3.0 beta 2: July 21, 2012 > -- 3.3.0 candidate 1: August 4, 2012 > -- 3.3.0 candidate 2: August 18, 2012 > -- 3.3.0 final: September 1, 2012 > +- 3.3.0 beta 2: August 11, 2012 > +- 3.3.0 candidate 1: August 25, 2012 > +- 3.3.0 candidate 2: September 8, 2012 > +- 3.3.0 final: September 22, 2012 > > .. don't forget to update final date above as well > > > -- > Repository URL: http://hg.python.org/peps > > _______________________________________________ > Python-checkins mailing list > Python-checkins(a)python.org > http://mail.python.org/mailman/listinfo/python-checkins > >

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Python-Dev August 2012