Mailman 3 February 2015 - Python-Dev

(no subject)
by Neil Girdhar Feb. 14, 2015

Feb. 14, 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. 14, 2015

Feb. 14, 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 … [View More]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 > > [View Less]

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Summary of Python tracker Issues
by Python tracker Feb. 14, 2015

Feb. 14, 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 … [View More]

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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 … [View More]

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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/… [View More]

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Re: [Python-Dev] cpython: Mirco-optimizations to reduce register spills and reloads observed on CLANG and
by Serhiy Storchaka Feb. 10, 2015

Feb. 10, 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/… [View More]

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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 … [View More]

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[RELEASE] Python 3.5.0a1 is now available
by Larry Hastings Feb. 9, 2015

Feb. 9, 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. 9, 2015

Feb. 9, 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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