Mailman 3 February 2018 - Python-Dev

unfrozen dataclasses and __hash__ (subsets are OK)
by Jim J. Jewett 05 Feb '18

05 Feb '18

I understand auto-generating the __hash__ (and __eq__) for a frozen container; that is just convenient. But why is there any desire to autogenerate a __hash__ for something that isn't frozen? Like a list or dict, the normal case would be for it not to have a hash at all, and the author *should* write out any explicit exceptions. The objection to that seems to be that someone might forget to add another field to the hash during later maintenance -- but so what? __hash__ should reference a subset of the fields used for equality, and strict subsets are OK. It *should* ignore some fields if that will provide the right balance between quick calculation and sufficient dispersion. If the record is complicated enough that forgetting a field is a likely problem, then the hash is probably already sufficiently complex without those new fields. -jJ

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[RELEASED] Python 3.4.8 and Python 3.5.5 are now available
by Larry Hastings 05 Feb '18

05 Feb '18

On behalf of the Python development community, I'm happy to announce the availability of Python 3.4.8 and Python 3.5.5. Both Python 3.4 and 3.5 are in "security fixes only" mode. Both versions only accept security fixes, not conventional bug fixes, and both releases are source-only. You can find Python 3.4.8 here: https://www.python.org/downloads/release/python-348/ And you can find Python 3.5.5 here: https://www.python.org/downloads/release/python-355/ Happy Pythoning, //arry/

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OS-X builds for 3.7.0
by Chris Barker 04 Feb '18

04 Feb '18

Ned, It looks like you're still building OS-X the same way as in the past: Intel 32+64 bit, 10.6 compatibility Is that right? Might it be time for an update? Do we still need to support 32 bit? From: https://apple.stackexchange.com/questions/99640/how-old-are-macs-that-canno… There has not been a 32 bit-only Mac sold since 2006, and a out-of the box 32 bit OS since 2006 or 2007 I can't find out what the older OS version Apple supports, but I know my IT dept has been making me upgrade, so I"m going to guess 10.8 or newer... And maybe we could even get rid of the "Framework" builds...... -CHB -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker(a)noaa.gov

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Is 4.0 a major breaking changes release?
by Alex Walters 04 Feb '18

04 Feb '18

I am still working on porting code from 2.x to 3.x. As of late on the lists I've seen comments about making somewhat major changes in 4.0 - now I'm concerned that I should pause my porting effort until that is released. Is python 4 going to be another python 3?

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"threading.Lock().locked()" is not documented
by Jesus Cea 04 Feb '18

04 Feb '18

https://docs.python.org/3.6/library/threading.html doesn't document "threading.Lock().locked()", and it is something quite useful. In fact, it is used in "threading.py" itself. For instance, lines 109, 985, 1289. Is there any reason to not document it?. (I didn't investigate other objects in the module). -- Jesús Cea Avión _/_/ _/_/_/ _/_/_/ jcea(a)jcea.es - http://www.jcea.es/ _/_/ _/_/ _/_/ _/_/ _/_/ Twitter: @jcea _/_/ _/_/ _/_/_/_/_/ jabber / xmpp:jcea@jabber.org _/_/ _/_/ _/_/ _/_/ _/_/ "Things are not so easy" _/_/ _/_/ _/_/ _/_/ _/_/ _/_/ "My name is Dump, Core Dump" _/_/_/ _/_/_/ _/_/ _/_/ "El amor es poner tu felicidad en la felicidad de otro" - Leibniz

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Deprecate crypt module and revert PR 3854
by Christian Heimes 04 Feb '18

04 Feb '18

Hi, in PR 3854 [1] Serhiy added blowfish, extended DES and NT-Hash to Python's crypt mdodule. I vetoed against addition of the APIs because all these hashing algorithms are not state of the art. Their quality ranges from old to horribly, horriblye broken beyond any repair. Shortly after the PR has landed, I was made aware that glibc has deprecated crypt(3) API [2] and favor of an external library called libxcrypt [3] from OpenWall Linux. I have patched Python 3.7 [4] to support libxcrypt. In light of deprecation of crypt(3) glibc function and bad quality of hashing algorithms, I'd like to raise the motion to revert 3854 and deprecate the crypt module. The whole module should be rather moved into 3rd party library that wraps xcrypt. Regards, Christian [1] https://github.com/python/cpython/pull/3854 [2] https://www.phoronix.com/scan.php?page=news_item&px=Fedora-28-libxcrypt-Pla… [3] https://github.com/besser82/libxcrypt [4] https://bugs.python.org/issue32635

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Is object the most base type? (bpo-20285)
by Terry Reedy 03 Feb '18

03 Feb '18

>>> object.__doc__ 'The most base type' I and several people on python-list thread "interactive help on the base object" (Dec 2013) thought this could be improved. On https://bugs.python.org/issue20285 and https://github.com/python/cpython/pull/4759 After some research, I believe the following, which is wrote on the issue, explains the uneasiness many feel. 'Base' is actually two words. As a noun (or verb), it comes from Ancient Greek βάσις (básis), a foundation from which other things extend or derive. As an adjective, it comes from Late Latin bassus (“low”). In computer science and Python, the couplet 'base class' is being used, it seems to me and apparently others, as a noun-noun compound, meaning, 'foundation class', not as an adjective-noun phrase meaning 'low class' (let along 'depraved class'). However, 'most base class' must be parsed as '(most base) class', with 'base' re-interpreted as the adjective meaning 'low' (or worse). The switch in meaning of 'base' is similar in 'baseball' versus 'most base ball'. --- I have suggested "The superclass for all Python classes." "The starting base class of all types and classes other than itself." I intended to pick the second, but Serhiy Storchake wants more opinions. -- Terry Jan Reedy

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Summary of Python tracker Issues
by Python tracker 03 Feb '18

03 Feb '18

ACTIVITY SUMMARY (2018-01-26 - 2018-02-02) Python tracker at https://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 6411 (-34) closed 38089 (+101) total 44500 (+67) Open issues with patches: 2492 Issues opened (35) ================== #32221: Converting ipv6 address to string representation using getname https://bugs.python.org/issue32221 reopened by yselivanov #32622: Implement loop.sendfile https://bugs.python.org/issue32622 reopened by vstinner #32683: isinstance is calling ob.__getattribute__ as a fallback instea https://bugs.python.org/issue32683 opened by bup #32684: asyncio.gather(..., return_exceptions=True) swallows cancellat https://bugs.python.org/issue32684 opened by socketpair #32689: shutil.move raises AttributeError if first argument is a pathl https://bugs.python.org/issue32689 opened by craigh #32691: "pdb -m <module>" sets __main__.__package__ incorrectly https://bugs.python.org/issue32691 opened by ncoghlan #32692: test_threading.test_set_and_clear fails in AppVeyor CI https://bugs.python.org/issue32692 opened by xiang.zhang #32694: Can no longer specify OpenSSL locations with CPPFLAGS / LDFLAG https://bugs.python.org/issue32694 opened by yselivanov #32695: tarfile.open() raises TypeError when using compresslevel param https://bugs.python.org/issue32695 opened by bbayles #32696: Fix pickling exceptions with multiple arguments https://bugs.python.org/issue32696 opened by slallum #32706: test_check_hostname() of test_ftplib started to fail randomly https://bugs.python.org/issue32706 opened by vstinner #32708: test_sendfile() hangs on AMD64 FreeBSD 10.x Shared 3.x buildbo https://bugs.python.org/issue32708 opened by vstinner #32710: test_asyncio leaked [4, 4, 3] memory blocks, sum=11 on AMD64 W https://bugs.python.org/issue32710 opened by vstinner #32713: tarfile.itn breaks if n is a negative float https://bugs.python.org/issue32713 opened by j0ffrey #32715: Make create_unix_server for SOCK_DGRAM work https://bugs.python.org/issue32715 opened by holger+lp #32716: setup.py register --repository is broken https://bugs.python.org/issue32716 opened by shimizukawa #32717: Document PEP 560 https://bugs.python.org/issue32717 opened by levkivskyi #32718: Install PowerShell activation scripts for venv for all platfor https://bugs.python.org/issue32718 opened by brett.cannon #32719: fatal error raised when Ctrl-C print loop https://bugs.python.org/issue32719 opened by xiang.zhang #32720: Format mini-language integer definition is incorrect https://bugs.python.org/issue32720 opened by ncoghlan #32723: codecs.open silently ignores argument errors https://bugs.python.org/issue32723 opened by xiang.zhang #32725: Instance of _multiprocessing.PipeConnection-subtype crash on d https://bugs.python.org/issue32725 opened by hakril #32726: macOS installer and framework enhancements and changes for 3.7 https://bugs.python.org/issue32726 opened by ned.deily #32728: Extend zipfile's compression level support to LZMA https://bugs.python.org/issue32728 opened by bbayles #32729: socket error handling needed https://bugs.python.org/issue32729 opened by rkdls #32730: Allow py launcher to launch other registered Pythons https://bugs.python.org/issue32730 opened by petsuter(a)gmail.com #32731: getpass.getuser() raises an unspecified exceptions (ImportErro https://bugs.python.org/issue32731 opened by gregory.p.smith #32732: LoggingAdapter ignores extra kwargs of Logger#log() https://bugs.python.org/issue32732 opened by mcoolive #32734: Asyncio Lock safety issue (unlimited acquire) https://bugs.python.org/issue32734 opened by bar.harel #32739: collections.deque rotate(n=1) default value not documented https://bugs.python.org/issue32739 opened by yuy #32742: zipfile extractall needlessly re-wraps ZipInfo instances https://bugs.python.org/issue32742 opened by peterbe #32743: Typo in hamt.c comments https://bugs.python.org/issue32743 opened by delimitry #32745: ctypes string pointer fields should accept embedded null chara https://bugs.python.org/issue32745 opened by theller #32746: More misspellings, mostly in source code. https://bugs.python.org/issue32746 opened by terry.reedy #32749: Remove dbm.dumb behavior deprecated in 3.6 https://bugs.python.org/issue32749 opened by serhiy.storchaka Most recent 15 issues with no replies (15) ========================================== #32749: Remove dbm.dumb behavior deprecated in 3.6 https://bugs.python.org/issue32749 #32746: More misspellings, mostly in source code. https://bugs.python.org/issue32746 #32728: Extend zipfile's compression level support to LZMA https://bugs.python.org/issue32728 #32718: Install PowerShell activation scripts for venv for all platfor https://bugs.python.org/issue32718 #32717: Document PEP 560 https://bugs.python.org/issue32717 #32716: setup.py register --repository is broken https://bugs.python.org/issue32716 #32713: tarfile.itn breaks if n is a negative float https://bugs.python.org/issue32713 #32708: test_sendfile() hangs on AMD64 FreeBSD 10.x Shared 3.x buildbo https://bugs.python.org/issue32708 #32696: Fix pickling exceptions with multiple arguments https://bugs.python.org/issue32696 #32695: tarfile.open() raises TypeError when using compresslevel param https://bugs.python.org/issue32695 #32692: test_threading.test_set_and_clear fails in AppVeyor CI https://bugs.python.org/issue32692 #32682: test_zlib improve version parsing https://bugs.python.org/issue32682 #32676: test_asyncio emits many warnings when run in debug mode https://bugs.python.org/issue32676 #32671: redesign Windows os.getlogin, and add os.getuser https://bugs.python.org/issue32671 #32663: SMTPUTF8SimTests are not actually being run https://bugs.python.org/issue32663 Most recent 15 issues waiting for review (15) ============================================= #32749: Remove dbm.dumb behavior deprecated in 3.6 https://bugs.python.org/issue32749 #32746: More misspellings, mostly in source code. https://bugs.python.org/issue32746 #32743: Typo in hamt.c comments https://bugs.python.org/issue32743 #32742: zipfile extractall needlessly re-wraps ZipInfo instances https://bugs.python.org/issue32742 #32739: collections.deque rotate(n=1) default value not documented https://bugs.python.org/issue32739 #32734: Asyncio Lock safety issue (unlimited acquire) https://bugs.python.org/issue32734 #32729: socket error handling needed https://bugs.python.org/issue32729 #32726: macOS installer and framework enhancements and changes for 3.7 https://bugs.python.org/issue32726 #32720: Format mini-language integer definition is incorrect https://bugs.python.org/issue32720 #32713: tarfile.itn breaks if n is a negative float https://bugs.python.org/issue32713 #32706: test_check_hostname() of test_ftplib started to fail randomly https://bugs.python.org/issue32706 #32695: tarfile.open() raises TypeError when using compresslevel param https://bugs.python.org/issue32695 #32694: Can no longer specify OpenSSL locations with CPPFLAGS / LDFLAG https://bugs.python.org/issue32694 #32691: "pdb -m <module>" sets __main__.__package__ incorrectly https://bugs.python.org/issue32691 #32689: shutil.move raises AttributeError if first argument is a pathl https://bugs.python.org/issue32689 Top 10 most discussed issues (10) ================================= #32394: socket lib beahavior change in 3.6.4 https://bugs.python.org/issue32394 11 msgs #32622: Implement loop.sendfile https://bugs.python.org/issue32622 11 msgs #32604: Expose the subinterpreters C-API in Python for testing use. https://bugs.python.org/issue32604 10 msgs #32591: Deprecate sys.set_coroutine_wrapper and replace it with more f https://bugs.python.org/issue32591 8 msgs #17305: IDNA2008 encoding missing https://bugs.python.org/issue17305 7 msgs #25988: collections.abc.Indexable https://bugs.python.org/issue25988 7 msgs #32694: Can no longer specify OpenSSL locations with CPPFLAGS / LDFLAG https://bugs.python.org/issue32694 7 msgs #26219: implement per-opcode cache in ceval https://bugs.python.org/issue26219 6 msgs #30693: tarfile add uses random order https://bugs.python.org/issue30693 6 msgs #31368: Add os.preadv() and os.pwritev() https://bugs.python.org/issue31368 6 msgs Issues closed (93) ================== #14799: Tkinter ttk tests hang on linux https://bugs.python.org/issue14799 closed by asvetlov #16648: stdib should use new exception types from PEP 3151 https://bugs.python.org/issue16648 closed by asvetlov #16705: Use concrete classes inherited from OSError instead of errno c https://bugs.python.org/issue16705 closed by asvetlov #17044: Implement PEP 422: Simple class initialisation hook https://bugs.python.org/issue17044 closed by ncoghlan #20984: 'Add/Remove Programs' dialog missing entries for 32-bit CPytho https://bugs.python.org/issue20984 closed by steve.dower #21417: Compression level for zipfile https://bugs.python.org/issue21417 closed by gregory.p.smith #22908: ZipExtFile in zipfile can be seekable https://bugs.python.org/issue22908 closed by gregory.p.smith #24325: Speedup types.coroutine() https://bugs.python.org/issue24325 closed by yselivanov #25942: Do not immediately SIGKILL subprocess child processes upon ^C https://bugs.python.org/issue25942 closed by gregory.p.smith #27505: Missing documentation for setting module __class__ attribute https://bugs.python.org/issue27505 closed by ncoghlan #27931: Email parse IndexError <""@wiarcom.com> https://bugs.python.org/issue27931 closed by xiang.zhang #28864: Add devnull file-like object https://bugs.python.org/issue28864 closed by rhettinger #28914: selectmodule build fails https://bugs.python.org/issue28914 closed by vstinner #29120: Move hash randomisation initialisation out of Python/random.c https://bugs.python.org/issue29120 closed by ncoghlan #29216: Space saving step for the LRU cache https://bugs.python.org/issue29216 closed by rhettinger #30117: test_lib2to3.test_parser.test_all_project_files() fails https://bugs.python.org/issue30117 closed by benjamin.peterson #30306: release arguments of contextmanager https://bugs.python.org/issue30306 closed by ncoghlan #30715: Test_winreg, test_dynamic_key hangs on my Win 10 https://bugs.python.org/issue30715 closed by terry.reedy #31356: Add context manager to temporarily disable GC https://bugs.python.org/issue31356 closed by rhettinger #31429: TLS cipher suite compile time option for downstream https://bugs.python.org/issue31429 closed by christian.heimes #31853: Use super().method instead of socket.method in SSLSocket https://bugs.python.org/issue31853 closed by christian.heimes #31961: subprocess._execute_child doesn't accept a single PathLike arg https://bugs.python.org/issue31961 closed by gregory.p.smith #32045: Does json.dumps have a memory leak? https://bugs.python.org/issue32045 closed by csabella #32072: Issues with binary plists https://bugs.python.org/issue32072 closed by serhiy.storchaka #32102: Add "capture_output=True" option to subprocess.run https://bugs.python.org/issue32102 closed by gregory.p.smith #32137: Stack overflow in repr of deeply nested dicts https://bugs.python.org/issue32137 closed by serhiy.storchaka #32226: Implement PEP 560: Core support for typing module and generic https://bugs.python.org/issue32226 closed by levkivskyi #32228: truncate() changes current stream position https://bugs.python.org/issue32228 closed by pitrou #32251: Add asyncio.BufferedProtocol https://bugs.python.org/issue32251 closed by yselivanov #32336: Save OrderedDict import in argparse https://bugs.python.org/issue32336 closed by rhettinger #32373: Add socket.getblocking() method https://bugs.python.org/issue32373 closed by yselivanov #32433: Provide optimized HMAC digest https://bugs.python.org/issue32433 closed by christian.heimes #32446: ResourceLoader.get_data() should accept a PathLike https://bugs.python.org/issue32446 closed by barry #32454: Add socket.close(fd) function https://bugs.python.org/issue32454 closed by christian.heimes #32513: dataclasses: make it easier to use user-supplied special metho https://bugs.python.org/issue32513 closed by eric.smith #32521: NIS module fails to build due to the removal of interfaces rel https://bugs.python.org/issue32521 closed by christian.heimes #32532: improve sys.settrace and sys.setprofile documentation https://bugs.python.org/issue32532 closed by xiang.zhang #32546: Unusual TypeError with dataclass decorator https://bugs.python.org/issue32546 closed by eric.smith #32550: STORE_ANNOTATION bytecode is unnecessary and can be removed. https://bugs.python.org/issue32550 closed by rhettinger #32565: Document the version of adding opcodes https://bugs.python.org/issue32565 closed by serhiy.storchaka #32571: Speed up and clean up getting optional attributes in C code https://bugs.python.org/issue32571 closed by yselivanov #32572: Add the ftplib option, overrides the IP address. https://bugs.python.org/issue32572 closed by giampaolo.rodola #32583: Crash during decoding using UTF-16/32 and custom error handler https://bugs.python.org/issue32583 closed by xiang.zhang #32605: Should we really hide unawaited coroutine warnings when an exc https://bugs.python.org/issue32605 closed by yselivanov #32611: Tkinter taskbar icon (Windows) https://bugs.python.org/issue32611 closed by terry.reedy #32624: Implement WriteTransport.is_protocol_paused() https://bugs.python.org/issue32624 closed by asvetlov #32630: Migrate decimal to use PEP 567 context variables https://bugs.python.org/issue32630 closed by yselivanov #32640: Python 2.7 str.join documentation is incorrect https://bugs.python.org/issue32640 closed by Mariatta #32645: test_asyncio: TLS tests fail on "x86 Windows7" buildbot https://bugs.python.org/issue32645 closed by vstinner #32649: complete C API doc debug and profile part with new PyTrace_OPC https://bugs.python.org/issue32649 closed by ncoghlan #32650: Debug support for native coroutines is broken https://bugs.python.org/issue32650 closed by yselivanov #32664: Connector "|" missing between ImportError and LookupError https://bugs.python.org/issue32664 closed by Mariatta #32668: deepcopy() fails on ArgumentParser instances https://bugs.python.org/issue32668 closed by terry.reedy #32670: Enforce PEP 479—StopIteration and generators—in Python 3.7 https://bugs.python.org/issue32670 closed by yselivanov #32674: minor documentation fix for '__import__' https://bugs.python.org/issue32674 closed by Mariatta #32675: dict.__contains__(unhashable) raises TypeError where False was https://bugs.python.org/issue32675 closed by r.david.murray #32677: Add.isascii() to str, bytes and bytearray https://bugs.python.org/issue32677 closed by inada.naoki #32678: Lazy import ast in inspect https://bugs.python.org/issue32678 closed by inada.naoki #32681: Fix uninitialized variable in os_dup2_impl https://bugs.python.org/issue32681 closed by gregory.p.smith #32685: Erroneous suggestion in print statement https://bugs.python.org/issue32685 closed by ncoghlan #32686: python3.6.4 build hangs on test_asyncio macOS 10.13 https://bugs.python.org/issue32686 closed by ned.deily #32687: wrong meaning of arg in Py_tracefunc doc https://bugs.python.org/issue32687 closed by xiang.zhang #32688: weird comment out line of code https://bugs.python.org/issue32688 closed by xiang.zhang #32690: Return function locals() in order of creation? https://bugs.python.org/issue32690 closed by rhettinger #32693: os.path.ismount does not accept bytes objects https://bugs.python.org/issue32693 closed by eryksun #32697: Guarantee that Python preserves the order of kwonly parameters https://bugs.python.org/issue32697 closed by larry #32698: Improper gzip compression if output file extension is not "gz" https://bugs.python.org/issue32698 closed by Delgan #32699: pythonXY._pth : unclear how .pth files are handled https://bugs.python.org/issue32699 closed by steve.dower #32700: spam? https://bugs.python.org/issue32700 closed by r.david.murray #32701: Typo in quopri documentation https://bugs.python.org/issue32701 closed by Mariatta #32702: Minor markup typo https://bugs.python.org/issue32702 closed by rhettinger #32703: 'async with' somehow suppresses unawaited coroutine warnings https://bugs.python.org/issue32703 closed by yselivanov #32704: Tracking https://bugs.python.org/issue32704 closed by eric.smith #32705: Current Android does not have posix_spawn https://bugs.python.org/issue32705 closed by gregory.p.smith #32707: Python/hamt.c warnings https://bugs.python.org/issue32707 closed by yselivanov #32709: the iterable for itertools.groupby must be sorted https://bugs.python.org/issue32709 closed by matrixise #32711: Fix warnings for Python/ast_unparse.c https://bugs.python.org/issue32711 closed by christian.heimes #32712: Modifying a list/dict effects all variables sharing that addre https://bugs.python.org/issue32712 closed by r.david.murray #32714: remove resourceLoader related code since it's deprecated https://bugs.python.org/issue32714 closed by jayyin11043 #32721: test_hashlib fails if _md5 is not built https://bugs.python.org/issue32721 closed by benjamin.peterson #32722: Mislabeling of a dict comprehension as a generator expression https://bugs.python.org/issue32722 closed by xiang.zhang #32724: Fix references to commands in Doc/pdb.rst https://bugs.python.org/issue32724 closed by asvetlov #32727: smtplib's SMTP.send_message behaves differently with from_addr https://bugs.python.org/issue32727 closed by r.david.murray #32733: test_coroutines is failed when run with -We https://bugs.python.org/issue32733 closed by njs #32735: Typo in f-string example in docs https://bugs.python.org/issue32735 closed by Mariatta #32736: random.triangular yields unexpected distribution when args mix https://bugs.python.org/issue32736 closed by rhettinger #32737: str.format not producing strings for nan argument in accordanc https://bugs.python.org/issue32737 closed by zach.ware #32738: CDLL : Can't find module https://bugs.python.org/issue32738 closed by christian.heimes #32740: test_calendar and test_re fail with unknown locale: UTF-8 in _ https://bugs.python.org/issue32740 closed by vishalsingh #32741: Add asyncio.TimerHandle.when() function https://bugs.python.org/issue32741 closed by asvetlov #32744: PEP 342 double colons typos in code https://bugs.python.org/issue32744 closed by delimitry #32747: remove trailing spaces in docstring https://bugs.python.org/issue32747 closed by serhiy.storchaka #32748: Improve _asyncio.TaskStepMethWrapper and TaskWakeupMethWrapper https://bugs.python.org/issue32748 closed by asvetlov

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Re: [Python-Dev] OS-X builds for 3.7.0
by Ray Donnelly 02 Feb '18

02 Feb '18

On Jan 30, 2018 6:47 PM, "Joni Orponen" <j.orponen(a)4teamwork.ch> wrote: On Tue, Jan 30, 2018 at 6:50 PM, Ray Donnelly <mingw.android(a)gmail.com> wrote: > While we're making such macOS-build requests, any chance of building a > static interpreter too? We've been doing that on the Anaconda > Distribution since the 5.0 release in September and it seems to be > working well. > PyPy is also currently eyeing doing their macOS builds better: https://bitbucket.org/pypy/pypy/issues/2734/establish-a-build-and-release- pipeline-for What do the Anaconda static builds get built on? We have our own clang pseudo cross-compilers and use a macOS 10.9 SDK for all of our package compilation to achieve compatibility (this means we can compile on newer macOS just fine). We see a 1.1 to 1.2 times performance benefit over official releases as measured using 'python performance'. Apart from a static interpreter we also enable LTO and PGO and only build for 64-bit so I'm not sure how much each bit continues. Our recipe for python 3.6 can be found at: https://github.com/AnacondaRecipes/python-feedstock/tree/master/recipe -- Joni Orponen _______________________________________________ Python-Dev mailing list Python-Dev(a)python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/ mingw.android%40gmail.com

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Re: [Python-Dev] Why is Python for Windows compiled with MSVC?
by Oleg Sivokon 01 Feb '18

01 Feb '18

> so why shouldn’t the one with the most users? Because it makes compilation difficult, and cross-compilatin completely impossible? Why is it difficult: a package maintainer needs to (1) buy MS Windows (2) create a special workflow for compiling on a different machine. This is both costly and inconsistent with free-as-in-freedom... It makes cross-compilation impossible because libraries produced by any tool that can run on all target platforms are incompatible with Python binaries on MS Windows. Again, many languages (i.e. projects similar in size an purpose to CPython) took a different approach: they use GNU compilers to be able to compile cross-platform. This is true for Ruby and Go at least. I would need to investigate further, but I think these two examples should be enough. > I’m likely biased because I work there and I’m the main intermediary with python-dev, but these days Microsoft is one of the strongest supporters of CPython. We employ the most core developers of any private company and we all are allowed work time to contribute, we provide full access to our development tools and platforms to all core developers and some prominent projects, we’ve made fixes, enhancements and releases or core products such as the CRT, MSVC, Visual Studio, Visual Studio Code, and Azure SPECIFICALLY to support CPython development and users. As far as I know, ALL the Windows buildbots are running on Azure subscriptions that Microsoft provides (though managed by some awesome volunteers). You’ll see us at PyCon US under the biggest banner and we’ll have a booth filled with engineers and not recruiters. Crash reports from thousands of opted-in users come into our systems and have directly lead to both CPython and Windows bug fixes. Oh, so this is the real reason... well, corporate interests are hard to argue against. But, this is an interesting statistic nevertheless. Thanks for letting me know. Best. Oleg This communication and all information contained in or attached to it is confidential, intended solely for the addressee, may be legally privileged and is the intellectual property of one of the companies of NEX Group plc ("NEX") or third parties. If you are not the intended addressee or receive this message in error, please immediately delete all copies of it and notify the sender. We have taken precautions to minimise the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachments. We do not accept liability for any loss or damage caused by software viruses. NEX reserves the right to monitor all communications. We do not accept any legal responsibility for the content of communications, and no communication shall be considered legally binding. Furthermore, if the content of this communication is personal or unconnected with our business, we accept no liability or responsibility for it. NEX Group plc is a public limited company registered in England and Wales under number 10013770 and certain of its affiliates are authorised and regulated by regulatory authorities. For further regulatory information please see www.NEX.com.

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