Mailman 3 February 2015 - Python-Dev

(no subject)
by Neil Girdhar Feb. 13, 2015

Feb. 13, 2015

Hello all, The updated PEP 448 (https://www.python.org/dev/peps/pep-0448/) is implemented now based on some early work by Thomas Wouters (in 2008) and Florian Hahn (2013) and recently completed by Joshua Landau and me. The issue tracker http://bugs.python.org/issue2292 has a working patch. Would someone be able to review it? Thank you very much, Neil

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Re: [Python-Dev] subclassing builtin data structures
by Isaac Schwabacher Feb. 13, 2015

Feb. 13, 2015

On 15-02-13, Neil Girdhar wrote: > Interesting: http://stackoverflow.com/questions/5490824/should-constructors-comply-with-… You'd better believe I read that thread not 20 minutes ago. :) > On Fri, Feb 13, 2015 at 3:37 PM, Isaac Schwabacher <alexander.belopolsky(a)gmail.com <ischwabacher(a)wisc.edu')" target="1">ischwabacher(a)wisc.edu> wrote: > > > On 15-02-13, Guido van Rossum wrote: > > > Are you willing to wait 10 days for an answer? I'm out of round tuits for a while. > > > > IIUC, the argument is that the Liskov Substitution Principle is a statement about how objects of a subtype behave relative to objects of a supertype, and it doesn't apply to constructors because they aren't behaviors of existing objects. So other overriding methods *should* be able to handle the same inputs that the respective overridden methods do, but constructors don't need to. Even though __init__ is written as an instance method, it seems like it's "morally" a part of the class method __new__ that's only split off for convenience. > > > > If this message is unclear, it's because I don't really understand this myself and I'm trying to articulate my best understanding of what's been said on this thread and those it links to. > > > > ijs > > > > > On Fri, Feb 13, 2015 at 10:22 AM, Alexander Belopolsky <http://bugs.python.org/issue2267#msg125979(javascript:main.compose('new', 't=alexander.belopolsky(a)gmail.com>(java_script:main.compose()> wrote: > > > > > > > > > > > On Fri, Feb 13, 2015 at 1:19 PM, Alexander Belopolsky <alexander.belopolsky(a)gmail.com <alexander.belopolsky(a)gmail.com>(java_script:main.compose()> wrote: > > > > >> > > > > >> FWIW you're wrong when you claim that "a constructor is no different from any other method". Someone else should probably explain this (it's an old argument that's been thoroughly settled). > > > > > > > > > > > > > > > Well, the best answer I've got in the past [1] was "ask on python-dev since Guido called the operator overriding expectation." :-) > > > > > > > > > > > > And let me repost this bit of history [1]: > > > > > > > > Here is the annotated pre-r82065 code: > > > > > > > > 39876 gvanrossum def __add__(self, other): > > > > 39876 gvanrossum if isinstance(other, timedelta): > > > > 39928 gvanrossum return self.__class__(self.__days + other.__days, > > > > 39876 gvanrossum self.__seconds + other.__seconds, > > > > 39876 gvanrossum self.__microseconds + other.__microseconds) > > > > 40207 tim_one return NotImplemented > > > > 39876 gvanrossum > > > > > > > > > > > > > > > > [1] > --Guido van Rossum (python.org/~guido(http://python.org/~guido)(http://python.org/~guido(http:/…) > > _______________________________________________ > > Python-Dev mailing list > > Python-Dev(a)python.org <Python-Dev(a)python.org> > > https://mail.python.org/mailman/listinfo/python-dev > > Unsubscribe: https://mail.python.org/mailman/options/python-dev/mistersheik%40gmail.com > >

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Summary of Python tracker Issues
by Python tracker Feb. 13, 2015

Feb. 13, 2015

ACTIVITY SUMMARY (2015-02-06 - 2015-02-13) 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 4790 (+25) closed 30430 (+32) total 35220 (+57) Open issues with patches: 2254 Issues opened (47) ================== #21793: httplib client/server status refactor http://bugs.python.org/issue21793 reopened by serhiy.storchaka #23402: dynload_shlib does not close ldl handles when the interpreter http://bugs.python.org/issue23402 opened by Adam #23403: Use pickle protocol 4 by default? http://bugs.python.org/issue23403 opened by serhiy.storchaka #23404: 'make touch' does not work with git clones of the source repos http://bugs.python.org/issue23404 opened by vlee #23405: Tools/freeze "make" gets missing file error with unix shared b http://bugs.python.org/issue23405 opened by ned.deily #23406: interning and list comprehension leads to unexpected behavior http://bugs.python.org/issue23406 opened by Abraham.Smith #23407: os.walk always follows Windows junctions http://bugs.python.org/issue23407 opened by craigh #23408: Pickle tests use incorrect test data http://bugs.python.org/issue23408 opened by serhiy.storchaka #23410: Document more BaseHTTPRequestHandler attributes http://bugs.python.org/issue23410 opened by vadmium #23411: Update urllib.parse.__all__ http://bugs.python.org/issue23411 opened by vadmium #23414: seek(count, whence) accepts bogus whence on windows, python2.7 http://bugs.python.org/issue23414 opened by mattip #23415: add-to-pydotorg does not support .exe installers for Windows http://bugs.python.org/issue23415 opened by larry #23416: Make urllib.parse.SplitResult etc arguments optional http://bugs.python.org/issue23416 opened by vadmium #23418: Keep http.server.__all__ up to date http://bugs.python.org/issue23418 opened by vadmium #23419: Faster default __reduce__ for classes without __init__ http://bugs.python.org/issue23419 opened by serhiy.storchaka #23420: python -m cProfile -s fails with non informative message http://bugs.python.org/issue23420 opened by rkuska #23422: Clarify docs for importlib.import_module() http://bugs.python.org/issue23422 opened by brett.cannon #23423: XPath Support in ElementTree doc omission http://bugs.python.org/issue23423 opened by mbakeranalecta #23424: Unicode character ends interactive session http://bugs.python.org/issue23424 opened by AGrzes #23425: Windows getlocale unix-like with french, german, portuguese, s http://bugs.python.org/issue23425 opened by fomcl(a)yahoo.com #23426: run_setup is broken in distutils http://bugs.python.org/issue23426 opened by belopolsky #23427: Python should expose command when invoked with -c http://bugs.python.org/issue23427 opened by jgehrcke #23428: Use the monotonic clock for thread conditions on POSIX platfor http://bugs.python.org/issue23428 opened by haypo #23430: socketserver.BaseServer.handle_error() should not catch exitin http://bugs.python.org/issue23430 opened by vadmium #23431: Idle Application Not Responding http://bugs.python.org/issue23431 opened by ww0115 #23432: Duplicate content in SystemExit documentation http://bugs.python.org/issue23432 opened by berker.peksag #23434: RFC6266 support (Content-Disposition for HTTP) http://bugs.python.org/issue23434 opened by Myroslav.Opyr #23436: xml.dom.minidom.Element.ownerDocument is hiden http://bugs.python.org/issue23436 opened by krocard #23437: Make user scripts directory versioned on Windows http://bugs.python.org/issue23437 opened by pmoore #23439: Fixed http.client.__all__ and added a test http://bugs.python.org/issue23439 opened by vadmium #23440: Extend http.server.SimpleHTTPRequestHandler testing http://bugs.python.org/issue23440 opened by vadmium #23441: rlcompleter: tab on empty prefix => insert spaces http://bugs.python.org/issue23441 opened by arigo #23442: http.client.REQUEST_HEADER_FIELDS_TOO_LARGE renamed in 3.5 http://bugs.python.org/issue23442 opened by vadmium #23443: XMLRPCLIB Exception uses str not class or instance http://bugs.python.org/issue23443 opened by kmarsh #23444: HCI Bluetooth socket bind error on an arm crosscompiled enviro http://bugs.python.org/issue23444 opened by Thomas.Chiroux #23446: Use PyMem_New instead of PyMem_Malloc http://bugs.python.org/issue23446 opened by serhiy.storchaka #23448: urllib2 needs to remove scope from IPv6 address when creating http://bugs.python.org/issue23448 opened by ngierman #23449: Fatal errors rebuilding 3.5 from Visual Studio Windows 8.1 64 http://bugs.python.org/issue23449 opened by BreamoreBoy #23450: Possible loss of data warnings building 3.5 Visual Studio Wind http://bugs.python.org/issue23450 opened by BreamoreBoy #23451: Deprecation warnings building 3.5 Visual Studio Windows 8.1 64 http://bugs.python.org/issue23451 opened by BreamoreBoy #23452: Build errors using VS Express 2013 in win32 mode http://bugs.python.org/issue23452 opened by BreamoreBoy #23453: Opening a stream with tarfile.open() triggers a TypeError: can http://bugs.python.org/issue23453 opened by chaica_ #23455: file iterator "deemed broken"; can resume after StopIteration http://bugs.python.org/issue23455 opened by dalke #23456: asyncio: add missing @coroutine decorators http://bugs.python.org/issue23456 opened by haypo #23457: make test failures http://bugs.python.org/issue23457 opened by dcrs6000(a)gmail.com #23458: [2.7] random: make the file descriptor non-inheritable (on POS http://bugs.python.org/issue23458 opened by haypo #23459: Linux: expose the new execveat() syscall http://bugs.python.org/issue23459 opened by haypo Most recent 15 issues with no replies (15) ========================================== #23459: Linux: expose the new execveat() syscall http://bugs.python.org/issue23459 #23457: make test failures http://bugs.python.org/issue23457 #23456: asyncio: add missing @coroutine decorators http://bugs.python.org/issue23456 #23455: file iterator "deemed broken"; can resume after StopIteration http://bugs.python.org/issue23455 #23452: Build errors using VS Express 2013 in win32 mode http://bugs.python.org/issue23452 #23444: HCI Bluetooth socket bind error on an arm crosscompiled enviro http://bugs.python.org/issue23444 #23443: XMLRPCLIB Exception uses str not class or instance http://bugs.python.org/issue23443 #23440: Extend http.server.SimpleHTTPRequestHandler testing http://bugs.python.org/issue23440 #23436: xml.dom.minidom.Element.ownerDocument is hiden http://bugs.python.org/issue23436 #23430: socketserver.BaseServer.handle_error() should not catch exitin http://bugs.python.org/issue23430 #23425: Windows getlocale unix-like with french, german, portuguese, s http://bugs.python.org/issue23425 #23423: XPath Support in ElementTree doc omission http://bugs.python.org/issue23423 #23422: Clarify docs for importlib.import_module() http://bugs.python.org/issue23422 #23420: python -m cProfile -s fails with non informative message http://bugs.python.org/issue23420 #23419: Faster default __reduce__ for classes without __init__ http://bugs.python.org/issue23419 Most recent 15 issues waiting for review (15) ============================================= #23458: [2.7] random: make the file descriptor non-inheritable (on POS http://bugs.python.org/issue23458 #23456: asyncio: add missing @coroutine decorators http://bugs.python.org/issue23456 #23451: Deprecation warnings building 3.5 Visual Studio Windows 8.1 64 http://bugs.python.org/issue23451 #23450: Possible loss of data warnings building 3.5 Visual Studio Wind http://bugs.python.org/issue23450 #23446: Use PyMem_New instead of PyMem_Malloc http://bugs.python.org/issue23446 #23444: HCI Bluetooth socket bind error on an arm crosscompiled enviro http://bugs.python.org/issue23444 #23442: http.client.REQUEST_HEADER_FIELDS_TOO_LARGE renamed in 3.5 http://bugs.python.org/issue23442 #23441: rlcompleter: tab on empty prefix => insert spaces http://bugs.python.org/issue23441 #23440: Extend http.server.SimpleHTTPRequestHandler testing http://bugs.python.org/issue23440 #23439: Fixed http.client.__all__ and added a test http://bugs.python.org/issue23439 #23437: Make user scripts directory versioned on Windows http://bugs.python.org/issue23437 #23434: RFC6266 support (Content-Disposition for HTTP) http://bugs.python.org/issue23434 #23432: Duplicate content in SystemExit documentation http://bugs.python.org/issue23432 #23430: socketserver.BaseServer.handle_error() should not catch exitin http://bugs.python.org/issue23430 #23428: Use the monotonic clock for thread conditions on POSIX platfor http://bugs.python.org/issue23428 Top 10 most discussed issues (10) ================================= #22524: PEP 471 implementation: os.scandir() directory scanning functi http://bugs.python.org/issue22524 13 msgs #23450: Possible loss of data warnings building 3.5 Visual Studio Wind http://bugs.python.org/issue23450 11 msgs #17911: traceback: add a new thin class storing a traceback without st http://bugs.python.org/issue17911 8 msgs #23328: urllib2 fails for proxy credentials that contain a '/' charact http://bugs.python.org/issue23328 8 msgs #23404: 'make touch' does not work with git clones of the source repos http://bugs.python.org/issue23404 8 msgs #19143: Finding the Windows version getting messier (detect windows 8. http://bugs.python.org/issue19143 7 msgs #21793: httplib client/server status refactor http://bugs.python.org/issue21793 7 msgs #23442: http.client.REQUEST_HEADER_FIELDS_TOO_LARGE renamed in 3.5 http://bugs.python.org/issue23442 7 msgs #23314: Disabling CRT asserts in debug build http://bugs.python.org/issue23314 6 msgs #23342: run() - unified high-level interface for subprocess http://bugs.python.org/issue23342 6 msgs Issues closed (26) ================== #7200: multiprocessing deadlock on Mac OS X when queue collected befo http://bugs.python.org/issue7200 closed by davin #9122: Problems with multiprocessing, Python embedding and Windows http://bugs.python.org/issue9122 closed by davin #9207: multiprocessing occasionally spits out exception during shutdo http://bugs.python.org/issue9207 closed by davin #11240: Running unit tests in a command line tool leads to infinite lo http://bugs.python.org/issue11240 closed by davin #12954: Multiprocessing logging under Windows http://bugs.python.org/issue12954 closed by davin #17023: Subprocess does not find executable on Windows if it is PATH w http://bugs.python.org/issue17023 closed by tim.golden #20416: Marshal: performance regression with versions 3 and 4 http://bugs.python.org/issue20416 closed by serhiy.storchaka #21568: Win32 pip doesn't use relative path to found site-packages. http://bugs.python.org/issue21568 closed by steve.dower #21840: Fix os.path in unicodeless build http://bugs.python.org/issue21840 closed by serhiy.storchaka #22430: Build failure if configure flags --prefix or --exec-prefix is http://bugs.python.org/issue22430 closed by ned.deily #22864: Add filter to multiprocessing.Pool http://bugs.python.org/issue22864 closed by davin #23344: Faster marshalling http://bugs.python.org/issue23344 closed by serhiy.storchaka #23357: pyvenv help shows incorrect usage http://bugs.python.org/issue23357 closed by python-dev #23361: integer overflow in winapi_createprocess http://bugs.python.org/issue23361 closed by python-dev #23383: Clean up bytes formatting http://bugs.python.org/issue23383 closed by serhiy.storchaka #23412: importlib sometimes fails to import a recently created module http://bugs.python.org/issue23412 closed by brett.cannon #23413: Incorrect division result http://bugs.python.org/issue23413 closed by benjamin.peterson #23417: Windows 8.1 and Windows Server 2012 R2 are not displayed prope http://bugs.python.org/issue23417 closed by steve.dower #23421: tarfile module does not correctly choose compression algorithm http://bugs.python.org/issue23421 closed by serhiy.storchaka #23429: -5**4 returns -625 instead of 625 http://bugs.python.org/issue23429 closed by serhiy.storchaka #23433: undefined behaviour in faulthandler.c, exposed by GCC 5 http://bugs.python.org/issue23433 closed by haypo #23435: installation with full path as prefix incomplete http://bugs.python.org/issue23435 closed by ned.deily #23438: HTMLParser doesn't know how to deal with 'ampersand' http://bugs.python.org/issue23438 closed by amaury.forgeotdarc #23445: Use -Og for debug builds http://bugs.python.org/issue23445 closed by pitrou #23447: Relative imports with __all__ attribute http://bugs.python.org/issue23447 closed by brett.cannon #23454: plistlib and xml.parsers.expat python3 problems with strings a http://bugs.python.org/issue23454 closed by serhiy.storchaka

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Problem running ./python -m test -v test_whatever
by Dwight Feb. 11, 2015

Feb. 11, 2015

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Binary concatenation (was Re: (no subject))
by Nick Coghlan Feb. 11, 2015

Feb. 11, 2015

On 11 February 2015 at 15:45, Greg Ewing <greg.ewing(a)canterbury.ac.nz> wrote: > Antoine Pitrou wrote: >>>>> >>>>> bytearray(b"a") + b"bc" >> >> >> bytearray(b'abc') >> >>>>> b"a" + bytearray(b"bc") >> >> >> b'abc' >> >> It's quite convenient. > > > It's a bit disconcerting that the left operand wins, > rather than one of them being designated as the > "wider" type, as occurs with many other operations on > mixed types, e.g. int + float. > > In any case, these seem to be special-case combinations. > It's not so promiscuous as to accept any old iterable > on the right: Binary concatenation accepts any bytes-like object (aka buffer API implementing type), and it's the fact that both bytes and bytearray interoperate with any bytes-like object that results in the "left operand wins" behaviour when you use them together. I don't believe we deliberately designed it that way, it's just an inherent consequence of having both types implement concatenation based on the buffer protocol rather than using any kind of type check. If we *had* tried to define one of the two as encompassing the other, then we would have also run into http://bugs.python.org/issue11477 Cheers, Nick. -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia

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Re: [Python-Dev] [Python-checkins] cpython: Update copyright.
by Benjamin Peterson Feb. 11, 2015

Feb. 11, 2015

On Tue, Feb 10, 2015, at 23:37, raymond.hettinger wrote: > https://hg.python.org/cpython/rev/7d826a6b92a1 > changeset: 94582:7d826a6b92a1 > user: Raymond Hettinger <python(a)rcn.com> > date: Tue Feb 10 22:37:22 2015 -0600 > summary: > Update copyright. > > files: > Modules/_collectionsmodule.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > > diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c > --- a/Modules/_collectionsmodule.c > +++ b/Modules/_collectionsmodule.c > @@ -3,7 +3,7 @@ > > /* collections module implementation of a deque() datatype > Written and maintained by Raymond D. Hettinger <python(a)rcn.com> > - Copyright (c) 2004-2014 Python Software Foundation. > + Copyright (c) 2004-2015 Python Software Foundation. > All rights reserved. > */ How about simply removing this line? The copyight years are well documented in the LICENSE and README.txt, and it would save you the trouble of keeping this up to date.

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Re: [Python-Dev] cpython: Mirco-optimizations to reduce register spills and reloads observed on CLANG and
by Serhiy Storchaka Feb. 9, 2015

Feb. 9, 2015

On 09.02.15 14:48, raymond.hettinger wrote: > https://hg.python.org/cpython/rev/dc820b44ce21 > changeset: 94572:dc820b44ce21 > user: Raymond Hettinger <python(a)rcn.com> > date: Mon Feb 09 06:48:29 2015 -0600 > summary: > Mirco-optimizations to reduce register spills and reloads observed on CLANG and GCC. > > files: > Objects/setobject.c | 6 ++++-- > 1 files changed, 4 insertions(+), 2 deletions(-) > > > diff --git a/Objects/setobject.c b/Objects/setobject.c > --- a/Objects/setobject.c > +++ b/Objects/setobject.c > @@ -84,8 +84,9 @@ > return set_lookkey(so, key, hash); > if (cmp > 0) /* likely */ > return entry; > + mask = so->mask; /* help avoid a register spill */ Could you please explain in more details what this line do? The mask variable is actually constant and so->mask isn't changed in this loop.

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Encoding of PyFrameObject members
by Francis Giraldeau Feb. 9, 2015

Feb. 9, 2015

I need to access frame members from within a signal handler for tracing purpose. My first attempt to access co_filename was like this (omitting error checking): PyFrameObject *frame = PyEval_GetFrame(); PyObject *ob = PyUnicode_AsUTF8String(frame->f_code->co_filename) char *str = PyBytes_AsString(ob) However, the function PyUnicode_AsUTF8String() calls PyObject_Malloc(), which is not reentrant. If the signal handler nest over PyObject_Malloc(), it causes a segfault, and it could also deadlock. Instead, I access members directly: char *str = PyUnicode_DATA(frame->f_code->co_filename); size_t len = PyUnicode_GET_DATA_SIZE(frame->f_code->co_filename); Is it safe to assume that unicode objects co_filename and co_name are always UTF-8 data for loaded code? I looked at the PyTokenizer_FromString() and it seems to convert everything to UTF-8 upfront, and I would like to make sure this assumption is valid. Thanks! Francis

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[RELEASE] Python 3.5.0a1 is now available
by Larry Hastings Feb. 8, 2015

Feb. 8, 2015

On behalf of the Python development community and the Python 3.5 release team, I'm also pleased to announce the availability of Python 3.5.0a1. Python 3.5.0a1 is the first alpha release of Python 3.5, which will be the next major release of Python. Python 3.5 is still under heavy development, and is far from complete. This is a preview release, and its use is not recommended for production settings. You can download it here: https://www.python.org/download/releases/3.5.0a1 Happy hacking, //arry/

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[RELEASE] Python 3.4.3rc1 is now available
by Larry Hastings Feb. 8, 2015

Feb. 8, 2015

On behalf of the Python development community and the Python 3.4 release team, I'm happy to announce the availability of Python 3.4.3rc1. Python 3.4.3rc1 has many bugfixes and other small improvements over 3.4.2. You can download it here: https://www.python.org/download/releases/3.4.3 Not done yet, //arry/

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