Mailman 3 December 2014 - Python-Dev

Summary of Python tracker Issues
by Python tracker Dec. 26, 2014

Dec. 26, 2014

ACTIVITY SUMMARY (2014-12-19 - 2014-12-26) 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 4691 ( +8) closed 30186 (+18) total 34877 (+26) Open issues with patches: 2198 Issues opened (17) ================== #23094: Unpickler failing with PicklingError at frame end on readline http://bugs.python.org/issue23094 opened by CensoredUsername #23095: asyncio: race condition in IocpProactor.wait_for_handle() http://bugs.python.org/issue23095 opened by haypo #23096: Implementation-depended pickling floats with protocol 0 http://bugs.python.org/issue23096 opened by serhiy.storchaka #23097: unittest can unnecessarily modify sys.path (and with the wrong http://bugs.python.org/issue23097 opened by chris.jerdonek #23098: mknod devices can be >32 bits http://bugs.python.org/issue23098 opened by jcea #23099: BytesIO and StringIO values unavailable when closed http://bugs.python.org/issue23099 opened by vadmium #23100: multiprocessing doc organization impedes understanding http://bugs.python.org/issue23100 opened by davin #23102: distutils: tip-toe around quirks owing to setuptools monkey-pa http://bugs.python.org/issue23102 opened by gmt #23103: ipaddress should be Flyweight http://bugs.python.org/issue23103 opened by sbromberger #23104: [Windows x86-64] ctypes: Incorrect function call http://bugs.python.org/issue23104 opened by Андрей.Парамонов #23105: os.O_SHLOCK and os.O_EXLOCK are not available on Linux http://bugs.python.org/issue23105 opened by Sworddragon #23106: Remove smalltable from set objects http://bugs.python.org/issue23106 opened by rhettinger #23107: Tighten-up search loops in sets http://bugs.python.org/issue23107 opened by rhettinger #23109: French quotes in the documentation are often ungrammatical http://bugs.python.org/issue23109 opened by cpitcla #23111: ftplib.FTP_TLS's default constructor does not work with TLSv1. http://bugs.python.org/issue23111 opened by varde #23114: "dist must be a Distribution instance" check fails with setupt http://bugs.python.org/issue23114 opened by scoder #23115: Backport #22585 -- getentropy for urandom to Python 2.7 http://bugs.python.org/issue23115 opened by alex Most recent 15 issues with no replies (15) ========================================== #23115: Backport #22585 -- getentropy for urandom to Python 2.7 http://bugs.python.org/issue23115 #23114: "dist must be a Distribution instance" check fails with setupt http://bugs.python.org/issue23114 #23111: ftplib.FTP_TLS's default constructor does not work with TLSv1. http://bugs.python.org/issue23111 #23107: Tighten-up search loops in sets http://bugs.python.org/issue23107 #23106: Remove smalltable from set objects http://bugs.python.org/issue23106 #23102: distutils: tip-toe around quirks owing to setuptools monkey-pa http://bugs.python.org/issue23102 #23097: unittest can unnecessarily modify sys.path (and with the wrong http://bugs.python.org/issue23097 #23095: asyncio: race condition in IocpProactor.wait_for_handle() http://bugs.python.org/issue23095 #23086: Add start and stop parameters to the Sequence.index() ABC mixi http://bugs.python.org/issue23086 #23081: Document PySequence_List(o) as equivalent to list(o) http://bugs.python.org/issue23081 #23078: unittest.mock patch autospec doesn't work on staticmethods http://bugs.python.org/issue23078 #23077: PEP 1: Allow Provisional status for PEPs http://bugs.python.org/issue23077 #23075: Mock backport in 2.7 relies on implementation defined behavior http://bugs.python.org/issue23075 #23067: Export readline forced_update_display http://bugs.python.org/issue23067 #23029: test_warnings produces extra output in quiet mode http://bugs.python.org/issue23029 Most recent 15 issues waiting for review (15) ============================================= #23115: Backport #22585 -- getentropy for urandom to Python 2.7 http://bugs.python.org/issue23115 #23107: Tighten-up search loops in sets http://bugs.python.org/issue23107 #23106: Remove smalltable from set objects http://bugs.python.org/issue23106 #23103: ipaddress should be Flyweight http://bugs.python.org/issue23103 #23102: distutils: tip-toe around quirks owing to setuptools monkey-pa http://bugs.python.org/issue23102 #23099: BytesIO and StringIO values unavailable when closed http://bugs.python.org/issue23099 #23098: mknod devices can be >32 bits http://bugs.python.org/issue23098 #23094: Unpickler failing with PicklingError at frame end on readline http://bugs.python.org/issue23094 #23089: Update libffi config files http://bugs.python.org/issue23089 #23088: Document that PyUnicode_AsUTF8() returns a null-terminated str http://bugs.python.org/issue23088 #23085: update internal libffi copy to 3.2.1 http://bugs.python.org/issue23085 #23081: Document PySequence_List(o) as equivalent to list(o) http://bugs.python.org/issue23081 #23080: BoundArguments.arguments should be unordered http://bugs.python.org/issue23080 #23075: Mock backport in 2.7 relies on implementation defined behavior http://bugs.python.org/issue23075 #23067: Export readline forced_update_display http://bugs.python.org/issue23067 Top 10 most discussed issues (10) ================================= #23103: ipaddress should be Flyweight http://bugs.python.org/issue23103 17 msgs #21279: str.translate documentation incomplete http://bugs.python.org/issue21279 8 msgs #23098: mknod devices can be >32 bits http://bugs.python.org/issue23098 5 msgs #22896: Don't use PyObject_As*Buffer() functions http://bugs.python.org/issue22896 4 msgs #23061: Update pep8 to specify explicitly 'module level' imports at to http://bugs.python.org/issue23061 4 msgs #19548: 'codecs' module docs improvements http://bugs.python.org/issue19548 3 msgs #22836: Broken "Exception ignored in:" message on exceptions in __repr http://bugs.python.org/issue22836 3 msgs #22926: asyncio: raise an exception when called from the wrong thread http://bugs.python.org/issue22926 3 msgs #23043: doctest ignores "from __future__ import print_function" http://bugs.python.org/issue23043 3 msgs #23094: Unpickler failing with PicklingError at frame end on readline http://bugs.python.org/issue23094 3 msgs Issues closed (17) ================== #19104: pprint produces invalid output for long strings http://bugs.python.org/issue19104 closed by serhiy.storchaka #19539: The 'raw_unicode_escape' codec buggy + not appropriate for Pyt http://bugs.python.org/issue19539 closed by zuo #20069: Add unit test for os.chown http://bugs.python.org/issue20069 closed by r.david.murray #21793: httplib client/server status refactor http://bugs.python.org/issue21793 closed by serhiy.storchaka #22585: os.urandom() should use getentropy() of OpenBSD 5.6 http://bugs.python.org/issue22585 closed by haypo #23040: Better documentation for the urlencode safe parameter http://bugs.python.org/issue23040 closed by r.david.murray #23071: codecs.__all__ incomplete http://bugs.python.org/issue23071 closed by serhiy.storchaka #23087: Exec variable not found error http://bugs.python.org/issue23087 closed by terry.reedy #23090: fix test_doctest relying on refcounting to close files http://bugs.python.org/issue23090 closed by python-dev #23091: unpacked keyword arguments are not unicode normalized http://bugs.python.org/issue23091 closed by benjamin.peterson #23092: Python 2.7.9 test_readline regression on CentOS 6 http://bugs.python.org/issue23092 closed by berker.peksag #23093: repr() on detached stream objects fails http://bugs.python.org/issue23093 closed by python-dev #23101: bleh, sorry, my cat reported this non-bug :) http://bugs.python.org/issue23101 closed by gmt #23108: pysha3 fails with obscure internal error http://bugs.python.org/issue23108 closed by benjamin.peterson #23110: Document if argument to Py_SetPath requires static storage. http://bugs.python.org/issue23110 closed by python-dev #23112: SimpleHTTPServer/http.server adds trailing slash after query s http://bugs.python.org/issue23112 closed by python-dev #23113: Compiler doesn't recognize qualified exec('', {}) http://bugs.python.org/issue23113 closed by johnf

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Email from Rietveld Code Review Tool is classified as spam
by Sky Kok Dec. 25, 2014

Dec. 25, 2014

Dear comrades, Merry Christmas for you who celebrates Christmas! Happy holidays for you who don't. Anyway, sometimes when people review my patches for CPython, they send me a notice through Rietveld Code Review Tool which later will send an email to me. However, my GMail spam filter is aggressive so the email will always be classified as spam because it fails spf checking. So if Taylor Swift clicks 'send email' in Rietveld after reviewing my patch, Rietveld will send email to me but the email pretends as if it is sent from taylor(a)swift.com. Hence, failing spf checking. Take an example where R. David Murray commented on my patch, I wouldn't know about it if I did not click Spam folder out of the blue. I remember in the past I had ignored Serhiy Storchaka's advice for months because his message was buried in spam folder. Maybe we shouldn't pretend as someone else when sending email through Rietveld? Cheers, Vajrasky Kok

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Re: [Python-Dev] [Python-checkins] cpython (3.4): improve incorrect French (#23109)
by Benjamin Peterson Dec. 24, 2014

Dec. 24, 2014

On Wed, Dec 24, 2014, at 15:59, Terry Reedy wrote: > On 12/24/2014 2:59 PM, benjamin.peterson wrote: > > https://hg.python.org/cpython/rev/2c87dd2d821e > > changeset: 93958:2c87dd2d821e > > branch: 3.4 > > parent: 93955:08972a47f710 > > user: Benjamin Peterson <benjamin(a)python.org> > > date: Wed Dec 24 13:58:05 2014 -0600 > > summary: > > improve incorrect French (#23109) > > > > Following suggestions from Clément. > > > > files: > > Doc/howto/unicode.rst | 4 ++-- > > 1 files changed, 2 insertions(+), 2 deletions(-) > > > > > > diff --git a/Doc/howto/unicode.rst b/Doc/howto/unicode.rst > > --- a/Doc/howto/unicode.rst > > +++ b/Doc/howto/unicode.rst > > @@ -32,8 +32,8 @@ > > In the mid-1980s an Apple II BASIC program written by a French speaker > > might have lines like these:: > > > > - PRINT "FICHIER EST COMPLETE." > > - PRINT "CARACTERE NON ACCEPTE." > > + PRINT "MISE A JOUR TERMINEE" > > + PRINT "PARAMETRES ENREGISTRES" > > > > Those messages should contain accents (completé, caractère, accepté), > > It seems that this list should have been changed also, to the words that > need accents in the replacement. Good point. Thank you.

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Summary of Python tracker Issues
by Python tracker Dec. 19, 2014

Dec. 19, 2014

ACTIVITY SUMMARY (2014-12-12 - 2014-12-19) 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 4683 (+17) closed 30168 (+31) total 34851 (+48) Open issues with patches: 2192 Issues opened (34) ================== #23042: Python 2.7.9 ctypes module doesn't build on FreeBSD x86 http://bugs.python.org/issue23042 opened by lemburg #23043: doctest ignores "from __future__ import print_function" http://bugs.python.org/issue23043 opened by fva #23046: asyncio.BaseEventLoop is documented, but only exported via asy http://bugs.python.org/issue23046 opened by vadmium #23050: Add Japanese legacy encodings http://bugs.python.org/issue23050 opened by t2y #23051: multiprocessing.pool methods imap() and imap_unordered() cause http://bugs.python.org/issue23051 opened by advance512 #23054: ConnectionError: ('Connection aborted.', BadStatusLine(""''''" http://bugs.python.org/issue23054 opened by joecabrera #23055: PyUnicode_FromFormatV crasher http://bugs.python.org/issue23055 opened by gvanrossum #23056: tarfile raises an exception when reading an empty tar in strea http://bugs.python.org/issue23056 opened by gregory.p.smith #23057: asyncio loop on Windows should stop on keyboard interrupt http://bugs.python.org/issue23057 opened by asvetlov #23058: argparse silently ignores arguments http://bugs.python.org/issue23058 opened by remram #23059: cmd module should sort misc help topics http://bugs.python.org/issue23059 opened by samwyse #23060: Assert fails in multiprocessing.heap.Arena.__setstate__ on Win http://bugs.python.org/issue23060 opened by steve.dower #23061: Update pep8 to specify explicitly 'module level' imports at to http://bugs.python.org/issue23061 opened by IanLee1521 #23062: test_argparse --version test cases http://bugs.python.org/issue23062 opened by vadmium #23063: `python setup.py check --restructuredtext --strict --metadata` http://bugs.python.org/issue23063 opened by Marc.Abramowitz #23065: Pyhton27.dll at SysWOW64 not updated when updating Python 2.7. http://bugs.python.org/issue23065 opened by GamesGamble #23067: Export readline forced_update_display http://bugs.python.org/issue23067 opened by dexteradeus #23068: Add a way to determine if the current thread has the import lo http://bugs.python.org/issue23068 opened by gvanrossum #23069: IDLE's F5 Run Module doesn't transfer effects of future import http://bugs.python.org/issue23069 opened by rhettinger #23071: codecs.__all__ incomplete http://bugs.python.org/issue23071 opened by vadmium #23072: 2.7.9 multiprocessing compile conflict http://bugs.python.org/issue23072 opened by aab(a)purdue.edu #23075: Mock backport in 2.7 relies on implementation defined behavior http://bugs.python.org/issue23075 opened by alex #23076: list(pathlib.Path().glob("")) fails with IndexError http://bugs.python.org/issue23076 opened by Antony.Lee #23077: PEP 1: Allow Provisional status for PEPs http://bugs.python.org/issue23077 opened by ncoghlan #23078: unittest.mock patch autospec doesn't work on staticmethods http://bugs.python.org/issue23078 opened by kevinbenton #23079: os.path.normcase documentation confusing http://bugs.python.org/issue23079 opened by chris.jerdonek #23080: BoundArguments.arguments should be unordered http://bugs.python.org/issue23080 opened by Antony.Lee #23081: Document PySequence_List(o) as equivalent to list(o) http://bugs.python.org/issue23081 opened by larsmans #23082: pathlib relative_to() can give confusing error message http://bugs.python.org/issue23082 opened by chris.jerdonek #23085: update internal libffi copy to 3.2.1 http://bugs.python.org/issue23085 opened by gustavotemple #23086: Add start and stop parameters to the Sequence.index() ABC mixi http://bugs.python.org/issue23086 opened by rhettinger #23087: Exec variable not found error http://bugs.python.org/issue23087 opened by Keith.Chewning #23088: Document that PyUnicode_AsUTF8() returns a null-terminated str http://bugs.python.org/issue23088 opened by vadmium #23089: Update libffi config files http://bugs.python.org/issue23089 opened by gustavotemple Most recent 15 issues with no replies (15) ========================================== #23088: Document that PyUnicode_AsUTF8() returns a null-terminated str http://bugs.python.org/issue23088 #23087: Exec variable not found error http://bugs.python.org/issue23087 #23086: Add start and stop parameters to the Sequence.index() ABC mixi http://bugs.python.org/issue23086 #23081: Document PySequence_List(o) as equivalent to list(o) http://bugs.python.org/issue23081 #23078: unittest.mock patch autospec doesn't work on staticmethods http://bugs.python.org/issue23078 #23077: PEP 1: Allow Provisional status for PEPs http://bugs.python.org/issue23077 #23075: Mock backport in 2.7 relies on implementation defined behavior http://bugs.python.org/issue23075 #23069: IDLE's F5 Run Module doesn't transfer effects of future import http://bugs.python.org/issue23069 #23067: Export readline forced_update_display http://bugs.python.org/issue23067 #23061: Update pep8 to specify explicitly 'module level' imports at to http://bugs.python.org/issue23061 #23059: cmd module should sort misc help topics http://bugs.python.org/issue23059 #23043: doctest ignores "from __future__ import print_function" http://bugs.python.org/issue23043 #23029: test_warnings produces extra output in quiet mode http://bugs.python.org/issue23029 #23028: CEnvironmentVariableTests and PyEnvironmentVariableTests test http://bugs.python.org/issue23028 #23027: test_warnings fails with -Werror http://bugs.python.org/issue23027 Most recent 15 issues waiting for review (15) ============================================= #23089: Update libffi config files http://bugs.python.org/issue23089 #23088: Document that PyUnicode_AsUTF8() returns a null-terminated str http://bugs.python.org/issue23088 #23085: update internal libffi copy to 3.2.1 http://bugs.python.org/issue23085 #23081: Document PySequence_List(o) as equivalent to list(o) http://bugs.python.org/issue23081 #23080: BoundArguments.arguments should be unordered http://bugs.python.org/issue23080 #23075: Mock backport in 2.7 relies on implementation defined behavior http://bugs.python.org/issue23075 #23071: codecs.__all__ incomplete http://bugs.python.org/issue23071 #23067: Export readline forced_update_display http://bugs.python.org/issue23067 #23063: `python setup.py check --restructuredtext --strict --metadata` http://bugs.python.org/issue23063 #23062: test_argparse --version test cases http://bugs.python.org/issue23062 #23061: Update pep8 to specify explicitly 'module level' imports at to http://bugs.python.org/issue23061 #23056: tarfile raises an exception when reading an empty tar in strea http://bugs.python.org/issue23056 #23055: PyUnicode_FromFormatV crasher http://bugs.python.org/issue23055 #23051: multiprocessing.pool methods imap() and imap_unordered() cause http://bugs.python.org/issue23051 #23050: Add Japanese legacy encodings http://bugs.python.org/issue23050 Top 10 most discussed issues (10) ================================= #14134: xmlrpc.client.ServerProxy needs timeout parameter http://bugs.python.org/issue14134 15 msgs #22980: C extension naming doesn't take bitness into account http://bugs.python.org/issue22980 9 msgs #23004: mock_open() should allow reading binary data http://bugs.python.org/issue23004 9 msgs #23085: update internal libffi copy to 3.2.1 http://bugs.python.org/issue23085 9 msgs #23050: Add Japanese legacy encodings http://bugs.python.org/issue23050 8 msgs #21071: struct.Struct.format is bytes, but should be str http://bugs.python.org/issue21071 7 msgs #23014: Don't have importlib.abc.Loader.create_module() be optional http://bugs.python.org/issue23014 7 msgs #23041: csv needs more quoting rules http://bugs.python.org/issue23041 7 msgs #23068: Add a way to determine if the current thread has the import lo http://bugs.python.org/issue23068 7 msgs #23071: codecs.__all__ incomplete http://bugs.python.org/issue23071 7 msgs Issues closed (30) ================== #15506: configure should use PKG_PROG_PKG_CONFIG http://bugs.python.org/issue15506 closed by python-dev #15513: Correct __sizeof__ support for pickle http://bugs.python.org/issue15513 closed by serhiy.storchaka #19858: Make pickletools.optimize aware of the MEMOIZE opcode. http://bugs.python.org/issue19858 closed by serhiy.storchaka #20577: IDLE: Remove FormatParagraph's width setting from config dialo http://bugs.python.org/issue20577 closed by terry.reedy #21236: patch to use cabinet.lib instead of fci.lib (fixes build with http://bugs.python.org/issue21236 closed by steve.dower #22733: MSVC ffi_prep_args doesn't handle 64-bit arguments properly http://bugs.python.org/issue22733 closed by steve.dower #22777: Test pickling with all protocols http://bugs.python.org/issue22777 closed by serhiy.storchaka #22783: Pickle: use NEWOBJ instead of NEWOBJ_EX if possible http://bugs.python.org/issue22783 closed by serhiy.storchaka #22823: Use set literals instead of creating a set from a list http://bugs.python.org/issue22823 closed by serhiy.storchaka #22875: asyncio: call_soon() documentation unclear on timing http://bugs.python.org/issue22875 closed by haypo #22919: Update PCBuild for VS 2015 http://bugs.python.org/issue22919 closed by steve.dower #22945: Ctypes inconsistent between Linux and OS X http://bugs.python.org/issue22945 closed by Daniel.Standage #23011: Duplicate Paragraph in documentation for json module http://bugs.python.org/issue23011 closed by terry.reedy #23015: Improve test_uuid http://bugs.python.org/issue23015 closed by serhiy.storchaka #23030: lru_cache manual get/put http://bugs.python.org/issue23030 closed by rhettinger #23031: pdb crashes when jumping over "with" statement http://bugs.python.org/issue23031 closed by DSP #23044: incorrect addition of floating point numbers http://bugs.python.org/issue23044 closed by benjamin.peterson #23045: json data iteration through loop in python http://bugs.python.org/issue23045 closed by steven.daprano #23047: typo in pyporting.rst http://bugs.python.org/issue23047 closed by berker.peksag #23048: abort when jumping out of a loop http://bugs.python.org/issue23048 closed by python-dev #23049: Fix functools.reduce code equivalent. http://bugs.python.org/issue23049 closed by rhettinger #23052: python2.7.9 [SSL: CERTIFICATE_VERIFY_FAILED] certificate verif http://bugs.python.org/issue23052 closed by berker.peksag #23053: test_urllib2_localnet fails without ssl http://bugs.python.org/issue23053 closed by python-dev #23064: pep8 asyncore.py http://bugs.python.org/issue23064 closed by r.david.murray #23066: re.match hang http://bugs.python.org/issue23066 closed by gvanrossum #23070: Error in Tutorial comment http://bugs.python.org/issue23070 closed by berker.peksag #23073: Broken turtle example in Cmd documentation http://bugs.python.org/issue23073 closed by ethan.furman #23074: asyncio: get_event_loop() must always raise an exception, even http://bugs.python.org/issue23074 closed by haypo #23083: sys.exit with bool parameter http://bugs.python.org/issue23083 closed by rhettinger #23084: Expose C struct timespec (nanosecond resolution) in time modul http://bugs.python.org/issue23084 closed by belopolsky

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Re: [Python-Dev] [PEPs] Fwd: fixing broken link in pep 3
by Chris Angelico Dec. 19, 2014

Dec. 19, 2014

On Fri, Dec 19, 2014 at 5:39 AM, Guido van Rossum <guido(a)python.org> wrote: >---------- Forwarded message ---------- > From: Victor Stinner <victor.stinner(a)gmail.com> > > Hi, > > Yes, the link is dead. It looks like the following link contains the same > info: > https://docs.python.org/devguide/triaging.html > > Dead page: > https://web.archive.org/web/20090704040931/http://www.python.org/dev/workfl… > "Core Development > Issue Workflow" > > Victor Edits made to PEP 3, link now updated. Noticed along the way that the next link down (for people _submitting_ bugs) is pointing to the /2/ section of the docs; should that be updated to send people to /3/, or are the two kept in sync? ChrisA

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Redirection of ar.pycon.org
by Facundo Batista Dec. 18, 2014

Dec. 18, 2014

Hi! Don't remember where to ask for changing the redirection of that domain name. Somebody knows? I need for the redirection to be to pycon.python.org.ar (and we'll take care of proper year-by-year redirection from there). Thanks! -- . Facundo Blog: http://www.taniquetil.com.ar/plog/ PyAr: http://www.python.org/ar/ Twitter: @facundobatista

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Re: [Python-Dev] libffi embedded in CPython
by Benjamin Peterson Dec. 18, 2014

Dec. 18, 2014

On Thu, Dec 18, 2014, at 14:50, Maciej Fijalkowski wrote: > well, the problem is essentially that libffi gets patched (e.g. for > ARM) and it does not make it's way to CPython quickly. This is > unlikely to be a security issue (for a variety of reasons, including > ctypes), but it's still an issue I think. Segfaults related to e.g. > stack alignment are hard to debug Certainly it's a suboptimal situation, but resolving it requires someone to figure out whether we still need/want whatever patches are in there.

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fixing broken link in pep 3
by Raymond Sanchez Dec. 18, 2014

Dec. 18, 2014

Hello my name is Raymond and I would like to fix a broken link on pep 3. If you go to https://www.python.org/dev/peps/pep-0003/ and click on link http://www.python.org/dev/workflow/, it returns a 404. What is the correct url? Should we also update the description "It has been replaced by the Issue Workflow"? After I'll get the correct answers, I will submit a patch. Thanks for your help.

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Proposal: Update PEP 1 to allow an explicit "Provisional" status for PEPs
by Nick Coghlan Dec. 18, 2014

Dec. 18, 2014

Hi folks, The recent release of setuptools 8.0 brought with it the migration to the more explicit version handling semantics defined in PEP 440. Some of the feedback on that release showed us that we could really use the equivalent of PEP 411 for interoperability PEPs as well as for standard library modules: a way to say "this is well defined enough for us to publish a reference implementation in the default packaging tools, but needs additional user feedback before we consider it completely stable". The reasons for this are mostly pragmatic: the kinds of tweaks we're talking about are small (in this specific case, changing the normalised form when publishing release candidates from 'c' to 'rc' , when installation tools are already required to accept either spelling as valid), but updating hyperlinks, other documentation references, etc means that spinning a full PEP revision just for that change would be excessively expensive in contributor time and energy. So over on distutils-sig, we're currently considering PEP 440 provisional until we're happy with the feedback we're receiving on setuptools 8.x and the upcoming pip 6.0 release. However, I'd be happier if we could communicate that status more explicitly through the PEP process, especially as I think such a capability would be useful more generally as we move towards implementing metadata 2.0 and potentially other enhancements for pip 7+ next year. If folks are OK with this idea, I'll go ahead and make the appropriate changes to PEP 1 and the PEP index generator. I'm also happy to file a tracker issue, or write a short PEP, if folks feel making such a change requires a little more formality in its own right. Regards, Nick. -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia

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A metaclass for immutability
by Tschijnmo Tschau Dec. 17, 2014

Dec. 17, 2014

Hi all, Recently when I am writing a computer algebra system for a very special purpose, it is found that being able to have objects of user-defined classes immutable can be very nice. It would greatly enhance the safety of the code. For example in the code that I were writing, objects hold a lot of references to other objects of user-defined class. If other parts of the code mutates the objects that is referenced, quite expected things could happen. As a result, an initial tentative implementation of a metaclass for making objects of user-defined classes immutable is written and put into a Github repository https://github.com/tschijnmo/immutableclass. Since I am not a python expert yet, could you please help me 1. If such a metaclass is Pythonic? Is it considered a good practice to use such a metaclass in a code that needs frequent maintenance? 2. Is this metaclass of interest to other Python developers as well? I mean is it worth-while to try to put this, or something like this, into the standard Python library? 3. If the answer to the above questions are affirmative, is my current implementation Pythonic? Especially if it is better implemented as a class decorator rather than a metaclass? Most of the code should be quite straightforward. It is mimicked after the named tuple in the collections library. Just for the initialization, basically what I did is to make a mutable proxy class for every immutable class. This proxy class is attempted to carry as much behaviour of the immutable class as possible, except it is mutable.Then the initializer defined by users are in fact called with self being an instance of the proxy class, then the actual immutable object is built out of it. This is my first time posting to this list. Any feedback is greatly appreciated. Thank you! Regards, Jinmo

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