Mailman 3 September 2015 - Python-Dev

Re: [Python-Dev] PEP: Collecting information about git
by Nick Coghlan 16 Sep '15

16 Sep '15

On 16 Sep 2015 18:48, "Paul Moore" <p.f.moore(a)gmail.com> wrote: > > On 16 September 2015 at 06:10, Stephen J. Turnbull <stephen(a)xemacs.org> wrote: > > The only thing that hg really lost badly on > > IMO was "named branches", and that's been fixed with bookmarks. > > FWIW, I still find bookmarks confusing to use compared to git > branches. I don't know whether that's because bitbucket doesn't > support them well, It's BitBucket - their PR system for Mercurial primarily relies on named branches rather than bookmarks. Gory details: https://bitbucket.org/site/master/issues/6705/cant-create-pull-request-from… Regards, Nick.

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Re: [Python-Dev] peps: Move 13 -> 103
by Serhiy Storchaka 15 Sep '15

15 Sep '15

On 15.09.15 04:21, barry.warsaw wrote: > https://hg.python.org/peps/rev/e275c4cd4b44 > changeset: 6059:e275c4cd4b44 > user: Barry Warsaw <barry(a)python.org> > date: Mon Sep 14 21:21:40 2015 -0400 > summary: > Move 13 -> 103 > > files: > pep-0103.rst | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > > diff --git a/pep-0013.rst b/pep-0103.rst > rename from pep-0013.rst > rename to pep-0103.rst Is it due to superstition?

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Re: [Python-Dev] [Python-checkins] cpython: In-line the append operations inside deque_inplace_repeat().
by Brett Cannon 15 Sep '15

15 Sep '15

Would it be worth adding a comment that the block of code is an inlined copy of deque_append()? Or maybe even turn the append() function into a macro so you minimize code duplication? On Sat, 12 Sep 2015 at 08:00 raymond.hettinger <python-checkins(a)python.org> wrote: > https://hg.python.org/cpython/rev/cb96ffe6ff10 > changeset: 97943:cb96ffe6ff10 > parent: 97941:b8f3a01937be > user: Raymond Hettinger <python(a)rcn.com> > date: Sat Sep 12 11:00:20 2015 -0400 > summary: > In-line the append operations inside deque_inplace_repeat(). > > files: > Modules/_collectionsmodule.c | 22 ++++++++++++++++++---- > 1 files changed, 18 insertions(+), 4 deletions(-) > > > diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c > --- a/Modules/_collectionsmodule.c > +++ b/Modules/_collectionsmodule.c > @@ -567,12 +567,26 @@ > if (n > MAX_DEQUE_LEN) > return PyErr_NoMemory(); > > + deque->state++; > for (i = 0 ; i < n-1 ; i++) { > - rv = deque_append(deque, item); > - if (rv == NULL) > - return NULL; > - Py_DECREF(rv); > + if (deque->rightindex == BLOCKLEN - 1) { > + block *b = newblock(Py_SIZE(deque) + i); > + if (b == NULL) { > + Py_SIZE(deque) += i; > + return NULL; > + } > + b->leftlink = deque->rightblock; > + CHECK_END(deque->rightblock->rightlink); > + deque->rightblock->rightlink = b; > + deque->rightblock = b; > + MARK_END(b->rightlink); > + deque->rightindex = -1; > + } > + deque->rightindex++; > + Py_INCREF(item); > + deque->rightblock->data[deque->rightindex] = item; > } > + Py_SIZE(deque) += i; > Py_INCREF(deque); > return (PyObject *)deque; > } > > -- > Repository URL: https://hg.python.org/cpython > _______________________________________________ > Python-checkins mailing list > Python-checkins(a)python.org > https://mail.python.org/mailman/listinfo/python-checkins >

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What happens of the Python 3.4 branch?
by Victor Stinner 14 Sep '15

14 Sep '15

Hi, Python 3.5.0 was released. What happens to the 3.4 branch in Mercurial? Does it still accept bugfixes, or is it only for security fixes now? Victor

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semantics of subclassing things from itertools
by Maciej Fijalkowski 14 Sep '15

14 Sep '15

Hi I would like to know what are the semantics if you subclass something from itertools (e.g. islice). Right now it's allowed and people do it, which is why the documentation is incorrect. It states "equivalent to: a function-or a generator", but you can't subclass whatever it is equivalent to, which is why in PyPy we're unable to make it work in pure python. I would like some clarification on that. Cheers, fijal

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Hash computation enhancement for {buffer, string, unicode}object
by Patrascu, Alecsandru 14 Sep '15

14 Sep '15

Hi All, This is Alecsandru from Server Scripting Languages Optimization team at Intel Corporation. I would like to submit a patch that improves the performance of the hash computation code on stringobject, bufferobject and unicodeobject. As can be seen from the attached sample performance results from the Grand Unified Python Benchmark, speedups up to 40% were observed. Furthermore, we see a 5-7% performance on OpenStack/Swift, where most of the code is in Python 2.7. Attached is the patch that modifies Object/stringobject.c, Object/bufferobject.c and Object/unicodeobject.c files. We built and tested this patch for Python 2.7 on our Linux machines (CentOS 7/Ubuntu Server 14.04, Intel Xeon Haswell/Broadwell with 18/8 cores). I've also opened an issue on the bug tracker: http://bugs.python.org/issue25106 Steps to apply the patch: 1. hg clone https://hg.python.org/cpython cpython 2. cd cpython 3. hg update 2.7 4. Copy hash8.patch to the current directory 5. hg import --no-commit hash8.patch 6. ./configure 7. make In the following, please find our sample performance results measured on a XEON Haswell machine. Hardware (HW): Intel XEON (Haswell) 18 Cores BIOS settings: Intel Turbo Boost Technology: false Hyper-Threading: false Operating System: Ubuntu 14.04.3 LTS trusty OS configuration: CPU freq set at fixed: 2.0GHz by echo 2000000 > /sys/devices/system/cpu/cpu*/cpufreq/scaling_min_freq echo 2000000 > /sys/devices/system/cpu/cpu*/cpufreq/scaling_max_freq Address Space Layout Randomization (ASLR) disabled (to reduce run to run variation) by echo 0 > /proc/sys/kernel/randomize_va_space GCC version: gcc version 4.8.4 (Ubuntu 4.8.4-2ubuntu1~14.04) Benchmark: Grand Unified Python Benchmark (GUPB) GUPB Source: https://hg.python.org/benchmarks/ Python2.7 results: Python source: hg clone https://hg.python.org/cpython cpython Python Source: hg update 2.7 Benchmarks Speedup(%) unpack_sequence 40.32733766 chaos 24.84002537 chameleon 23.01392651 silent_logging 22.27202911 django 20.83842317 etree_process 20.46968294 nqueens 20.34234985 pathlib 19.63445919 pidigits 19.34722148 etree_generate 19.25836634 pybench 19.06895825 django_v2 18.06073108 etree_iterparse 17.3797149 fannkuch 17.08120879 pickle_list 16.60363602 raytrace 16.0316265 slowpickle 15.86611184 pickle_dict 15.30447114 call_simple 14.42909032 richards 14.2949594 simple_logging 13.6522626 etree_parse 13.38113097 json_dump_v2 12.26588885 float 11.88164311 mako 11.20606516 spectral_norm 11.04356684 hg_startup 10.57686164 mako_v2 10.37912648 slowunpickle 10.24030714 go 10.03567319 meteor_contest 9.956231435 normal_startup 9.607401586 formatted_logging 9.601244811 html5lib 9.082603748 2to3 8.741557816 html5lib_warmup 8.268150981 nbody 7.507012306 regex_compile 7.153922724 bzr_startup 7.140244739 telco 6.869411927 slowspitfire 5.746323922 tornado_http 5.24360121 rietveld 3.865704876 regex_v8 3.777622219 hexiom2 3.586305282 json_dump 3.477551682 spambayes 3.183991854 fastunpickle 2.971645347 fastpickle 0.673086656 regex_effbot 0.127946837 json_load 0.023727176 Thank you, Alecsandru

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When is 3.4.4 scheduled?
by Terry Reedy 14 Sep '15

14 Sep '15

I could not fine '3.4.4' either in https://www.python.org/dev/peps/pep-0429/ 3.4 schedule or elsewhere on the site. -- Terry Jan Reedy

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Windows x86-64 embeddable zip file, Feedback
by tds333＠gmail.com 14 Sep '15

14 Sep '15

Hi, had some time to test the new distributed stuff for Windows especially the embeddable zip. Thanks for this special distribution, it is very useful to generate standalone Python distributions and software based on Python. Very good work. I detected two minor issues only affecting size, opened tickets for them: http://bugs.python.org/issue25085 Windows x86-64 embeddable zip file contains test directorys http://bugs.python.org/issue25086 Windows x86-64 embeddable zip file, lot of big EXE files in distuils Think this can be an improvement in size, targeting for Python 3.5.1. Regards, Wolfgang

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Re: [Python-Dev] PEP 495 Was: PEP 498: Literal String Interpolation is ready for pronouncement
by Alexander Belopolsky 13 Sep '15

13 Sep '15

On Tue, Sep 8, 2015 at 8:27 PM, Guido van Rossum <guido(a)python.org> wrote: > Now if only PEP 495 could be as easy... :-) > I think we nailed the hard issues there. The next update will have a restored hash invariant and == that satisfies all three axioms of equivalency. I am not making a better progress because I am debating with myself about the fate of < and > comparisons. Cross-zone comparisons strike in full force there as well because two times ordered in UTC may appear in the opposite order in the local timezone where the clock is moved back. Note that I saved the hash invariant and the transitivity of == at the expense of the loss of trichotomy in comparisons (we will have pairs of aware datetimes that are neither equal nor < nor >). I don't think we need to change anything with < and > comparisons, but I am trying to come up with the arguments that will at least be convincing to myself. (I suspect that if I am not the only one who worries about this, the other such people can be counted by the values of the fold flag. :-)

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[RELEASED] Python 3.5.0 is now available
by Larry Hastings 13 Sep '15

13 Sep '15

On behalf of the Python development community and the Python 3.5 release team, I'm proud to announce the availability of Python 3.5.0. Python 3.5.0 is the newest version of the Python language, and it contains many exciting new features and optimizations. You can read all about what's new in Python 3.5.0 here: https://docs.python.org/3.5/whatsnew/3.5.html And you can download Python 3.5.0 here: https://www.python.org/downloads/release/python-350/ Windows and Mac users: please read the important platform-specific "Notes on this release" section near the end of that page. We hope you enjoy Python 3.5.0! //arry/

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