Python-Dev July 2017

python-dev@python.org

73 participants
44 discussions

congrats on 3.5! Alas, windows 7 users are having problems installing it

by Laura Creighton

webmaster has already heard from 4 people who cannot install it. I sent them to the bug tracker or to python-list but they seem not to have gone either place. Is there some guide I should be sending them to, 'how to debug installation problems'? Laura

8 months, 2 weeks

Python startup time

by Victor Stinner

Hi, On Twitter, Raymond Hettinger wrote: "The decision making process on Python-dev is an anti-pattern, governed by anecdotal data and ambiguity over what problem is solved." https://twitter.com/raymondh/status/887069454693158912 About "anecdotal data", I would like to discuss the Python startup time. == Python 3.7 compared to 2.7 == First of all, on speed.python.org, we have: * Python 2.7: 6.4 ms with site, 3.0 ms without site (-S) * master (3.7): 14.5 ms with site, 8.4 ms without site (-S) Python 3.7 startup time is 2.3x slower with site (default mode), or 2.8x slower without site (-S command line option). (I will skip Python 3.4, 3.5 and 3.6 which are much worse than Python 3.7...) So if an user complained about Python 2.7 startup time: be prepared for a 2x - 3x more angry user when "forced" to upgrade to Python 3! == Mercurial vs Git, Python vs C, startup time == Startup time matters a lot for Mercurial since Mercurial is compared to Git. Git and Mercurial have similar features, but Git is written in C whereas Mercurial is written in Python. Quick benchmark on the speed.python.org server: * hg version: 44.6 ms +- 0.2 ms * git --version: 974 us +- 7 us Mercurial startup time is already 45.8x slower than Git whereas tested Mercurial runs on Python 2.7.12. Now try to sell Python 3 to Mercurial developers, with a startup time 2x - 3x slower... I tested Mecurial 3.7.3 and Git 2.7.4 on Ubuntu 16.04.1 using "python3 -m perf command -- ...". == CPython core developers don't care? no, they do care == Christian Heimes, Naoki INADA, Serhiy Storchaka, Yury Selivanov, me (Victor Stinner) and other core developers made multiple changes last years to reduce the number of imports at startup, optimize impotlib, etc. IHMO all these core developers are well aware of the competition of programming languages, and honesty Python startup time isn't "good". So let's compare it to other programming languages similar to Python. == PHP, Ruby, Perl == I measured the startup time of other programming languages which are similar to Python, still on the speed.python.org server using "python3 -m perf command -- ...": * perl -e ' ': 1.18 ms +- 0.01 ms * php -r ' ': 8.57 ms +- 0.05 ms * ruby -e ' ': 32.8 ms +- 0.1 ms Wow, Perl is quite good! PHP seems as good as Python 2 (but Python 3 is worse). Ruby startup time seems less optimized than other languages. Tested versions: * perl 5, version 22, subversion 1 (v5.22.1) * PHP 7.0.18-0ubuntu0.16.04.1 (cli) ( NTS ) * ruby 2.3.1p112 (2016-04-26) [x86_64-linux-gnu] == Quick Google search == I also searched for "python startup time" and "python slow startup time" on Google and found many articles. Some examples: "Reducing the Python startup time" http://www.draketo.de/book/export/html/498 => "The python startup time always nagged me (17-30ms) and I just searched again for a way to reduce it, when I found this: The Python-Launcher caches GTK imports and forks new processes to reduce the startup time of python GUI programs." https://nelsonslog.wordpress.com/2013/04/08/python-startup-time/ => "Wow, Python startup time is worse than I thought." "How to speed up python starting up and/or reduce file search while loading libraries?" https://stackoverflow.com/questions/15474160/how-to-speed-up-python-startin… => "The first time I log to the system and start one command it takes 6 seconds just to show a few line of help. If I immediately issue the same command again it takes 0.1s. After a couple of minutes it gets back to 6s. (proof of short-lived cache)" "How does one optimise the startup of a Python script/program?" https://www.quora.com/How-does-one-optimise-the-startup-of-a-Python-script-… => "I wrote a Python program that would be used very often (imagine 'cd' or 'ls') for very short runtimes, how would I make it start up as fast as possible?" "Python Interpreter Startup time" https://bytes.com/topic/python/answers/34469-pyhton-interpreter-startup-time "Python is very slow to start on Windows 7" https://stackoverflow.com/questions/29997274/python-is-very-slow-to-start-o… => "Python takes 17 times longer to load on my Windows 7 machine than Ubuntu 14.04 running on a VM" => "returns in 0.614s on Windows and 0.036s on Linux" "How to make a fast command line tool in Python" (old article Python 2.5.2) https://files.bemusement.org/talks/OSDC2008-FastPython/ => "(...) some techniques Bazaar uses to start quickly, such as lazy imports." -- So please continue efforts for make Python startup even faster to beat all other programming languages, and finally convince Mercurial to upgrade ;-) Victor

1 year, 7 months

Python 3.3.7 release schedule and end-of-life

by Ned Deily

Python 3.3 is fast approaching its end-of-life date, 2017-09-29. Per our release policy, that date is five years after the initial release of 3.3, 3.3.0 final on 2012-09-29. Note that 3.3 has been in security-fix only mode since the 2014-03-08 release of 3.3.5. It has been a while since we produced a 3.3.x security-fix release and, due to his commitments elsewhere, Georg has agreed for me to lead 3.3 to its well-deserved retirement. To that end, I would like to schedule its next, and hopefully final, security-fix release to coincide with the already announced 3.4.7 security-fix release. In particular, we'll plan to tag and release 3.3.7rc1 on Monday 2017-07-24 (UTC) and tag and release 3.3.7 final on Monday 2017-08-07. In the coming days, I'll be reviewing the outstanding 3.3 security issues and merging appropriate 3.3 PRs. Some of them have been sitting as patches for a long time so, if you have any such security issues that you think belong in 3.3, it would be very helpful if you would review such patches and turn them into 3.3 PRs. As a reminder, here are the guidelines from the devguide as to what is appropriate for a security-fix only branch: "The only changes made to a security branch are those fixing issues exploitable by attackers such as crashes, privilege escalation and, optionally, other issues such as denial of service attacks. Any other changes are not considered a security risk and thus not backported to a security branch. You should also consider fixing hard-failing tests in open security branches since it is important to be able to run the tests successfully before releasing." Note that documentation changes, other than any that might be related to a security fix, are also out of scope. Assuming no new security issues arise prior to the EOL date, 3.3.7 will likely be the final release of 3.3. And you really shouldn't be using 3.3 at all at this point; while downstream distributors are, of course, free to provide support of 3.3 to their customers, in a little over two months when EOL is reached python-dev will no longer accept any issues or make any changes available for 3.3. If you are still using 3.3, you really owe it to your applications, to your users, and to yourself to upgrade to a more recent release of Python 3, preferably 3.6! Many, many fixes, new features, and substantial performance improvements await you. https://www.python.org/dev/peps/pep-0398/ https://devguide.python.org/devcycle/#security-branches -- Ned Deily nad(a)python.org -- []

2 years, 9 months

Help requested with Python 2.7 performance regression

by Barry Warsaw

Hello all, Over in Ubuntu, we've gotten reports about some performance regressions in Python 2.7 when moving from Trusty (14.04 LTS) to Xenial (16.04 LTS). Trusty's version is based on 2.7.6 while Xenial's version is based on 2.7.12 with bits of .13 cherry picked. We've not been able to identify any change in Python itself (or the Debian/Ubuntu deltas) which could account for this, so the investigation has led to various gcc compiler options and version differences. In particular disabling LTO (link-time optimization) seems to have a positive impact, but doesn't completely regain the loss. Louis (Cc'd here) has done a ton of work to measure and analyze the problem, but we've more or less hit a roadblock, so we're taking the issue public to see if anybody on this mailing list has further ideas. A detailed analysis is available in this Google doc: https://docs.google.com/document/d/1zrV3OIRSo99fd2Ty4YdGk_scmTRDmVauBprKL8e… The document should be public for comments and editing. If you have any thoughts, or other lines of investigation you think are worthwhile pursuing, please add your comments to the document. Cheers, -Barry

2 years, 9 months

for...else

by Kiuhnm

Hello, I think that the expression "for...else" or "while...else" is completely counter-intuitive. Wouldn't it be possible to make it clearer? Maybe something like break in for i in range(n): ... if cond: break else: ... I'm not an English native speaker so I don't know whether "break in" is acceptable English in this context or can only mean "to get into a building by force". Kiuhnm

2 years, 10 months

Summary of Python tracker Issues

by Python tracker

ACTIVITY SUMMARY (2017-07-21 - 2017-07-28) 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 6088 (+30) closed 36736 (+57) total 42824 (+87) Open issues with patches: 2337 Issues opened (72) ================== #26732: multiprocessing sentinel resource leak http://bugs.python.org/issue26732 reopened by haypo #28734: argparse: successive parsing wipes out nargs=? values http://bugs.python.org/issue28734 reopened by paul.j3 #29512: regrtest refleak: implement bisection feature http://bugs.python.org/issue29512 reopened by haypo #30188: test_nntplib: random EOFError in setUpClass() http://bugs.python.org/issue30188 reopened by haypo #30778: test_bsddb3 crash on x86 Windows XP 2.7 http://bugs.python.org/issue30778 reopened by haypo #30985: Set closing variable in asyncore at close http://bugs.python.org/issue30985 opened by walkhour #30986: Add --include-py argument to Tools/msi/make_zip.py http://bugs.python.org/issue30986 opened by Segev Finer #30987: Support for ISO-TP protocol in SocketCAN http://bugs.python.org/issue30987 opened by Pier-Yves Lessard #30988: Exception parsing invalid email address headers starting or en http://bugs.python.org/issue30988 opened by timb07 #30989: Sort only when needed in TimedRotatingFileHandler's getFilesTo http://bugs.python.org/issue30989 opened by Lovesh Harchandani #30990: Calls to C functions using `.__call__` don't get sent to profi http://bugs.python.org/issue30990 opened by ppperry #30991: test_ctypes ,test_dbm and test_ssl fail on arm64 (aarch64) ar http://bugs.python.org/issue30991 opened by jonny789 #30992: Invalid PGP Key Prevents Archive Validation http://bugs.python.org/issue30992 opened by cwprogram #30995: Support logging.getLogger(style='{') http://bugs.python.org/issue30995 opened by mitar #30996: add coroutine AbstractEventLoop.sock_close http://bugs.python.org/issue30996 opened by cfy #30997: TestCase.subTest and expectedFailure http://bugs.python.org/issue30997 opened by ronaldoussoren #30999: statistics module: add "key" keyword argument to median, mode, http://bugs.python.org/issue30999 opened by gerion #31000: Test failure in resource module on ZFS http://bugs.python.org/issue31000 opened by larry #31001: IDLE: Add tests for configdialog highlight tab http://bugs.python.org/issue31001 opened by terry.reedy #31002: IDLE: Add tests for configdialog keys tab http://bugs.python.org/issue31002 opened by terry.reedy #31004: IDLE, configdialog: Factor out FontTab class from ConfigDialog http://bugs.python.org/issue31004 opened by terry.reedy #31005: caught and stored exception creates a reference cycle outside http://bugs.python.org/issue31005 opened by vojtechfried #31006: typing.NamedTuple should add annotations to its constructor (_ http://bugs.python.org/issue31006 opened by Antony.Lee #31007: ERROR: test_pipe_handle (test.test_asyncio.test_windows_utils. http://bugs.python.org/issue31007 opened by haypo #31008: FAIL: test_wait_for_handle (test.test_asyncio.test_windows_eve http://bugs.python.org/issue31008 opened by haypo #31010: test_socketserver.test_ForkingTCPServer(): threading_cleanup() http://bugs.python.org/issue31010 opened by haypo #31011: Users (except from the one who installed) not able to see pyt http://bugs.python.org/issue31011 opened by Debarshi.Goswami #31012: suggestion: allow termination argument in argparse to be speci http://bugs.python.org/issue31012 opened by Leon Avery #31013: gcc7 throws warning when pymem.h development header is used http://bugs.python.org/issue31013 opened by Gabriel Somlo #31014: webbrowser._synthesize uses outdated calling signature for web http://bugs.python.org/issue31014 opened by jmsdvl #31015: PyErr_WriteUnraisable should be more verbose in Python 2.7 http://bugs.python.org/issue31015 opened by christian.aguilera(a)foundry.com #31016: [Regression] sphinx shows an EOF error when using python2.7 fr http://bugs.python.org/issue31016 opened by doko #31020: Add support for custom compressor in tarfile http://bugs.python.org/issue31020 opened by insomniacslk #31021: Clarify programming faq. http://bugs.python.org/issue31021 opened by terry.reedy #31022: ERROR: testRegularFile (test.test_socket.SendfileUsingSendTest http://bugs.python.org/issue31022 opened by haypo #31024: typing.Tuple is class but is defined as data inside https://do http://bugs.python.org/issue31024 opened by Bernát Gábor #31026: test_dbm fails when run directly http://bugs.python.org/issue31026 opened by serhiy.storchaka #31027: test_listcomps fails when run directly http://bugs.python.org/issue31027 opened by serhiy.storchaka #31028: test_pydoc fails when run directly http://bugs.python.org/issue31028 opened by serhiy.storchaka #31029: test_tokenize fails when run directly http://bugs.python.org/issue31029 opened by serhiy.storchaka #31030: sys.executable can be not normalized http://bugs.python.org/issue31030 opened by serhiy.storchaka #31031: Unify duplicate bits_in_digit and bit_length http://bugs.python.org/issue31031 opened by niklasf #31033: Add argument to .cancel() of Task and Future http://bugs.python.org/issue31033 opened by socketpair #31035: Document order of firing callbacks added with Future.add_done_ http://bugs.python.org/issue31035 opened by socketpair #31036: building the python docs requires the blurb module http://bugs.python.org/issue31036 opened by doko #31038: test_runpy causes running all Python tests when run directly http://bugs.python.org/issue31038 opened by serhiy.storchaka #31039: Python on android must use ashmem instead of shmem http://bugs.python.org/issue31039 opened by Alex Davies #31040: mimetypes.add_type should complain when you give it an undotte http://bugs.python.org/issue31040 opened by odd_bloke #31041: test_handle_called_with_mp_queue() of test_logging: threading_ http://bugs.python.org/issue31041 opened by haypo #31042: Inconsistency in documentation of operator.index http://bugs.python.org/issue31042 opened by madphysicist #31045: Add a language switch to the Python documentation http://bugs.python.org/issue31045 opened by mdk #31046: ensurepip does not honour the value of $(prefix) http://bugs.python.org/issue31046 opened by xdegaye #31047: Windows: os.path.isabs(os.path.abspath(" ")) == False http://bugs.python.org/issue31047 opened by lazka #31048: ResourceWarning in test_asyncio.test_events.ProactorEventLoopT http://bugs.python.org/issue31048 opened by Segev Finer #31050: IDLE, configdialog: Factor out GenTab class from ConfigDialog http://bugs.python.org/issue31050 opened by terry.reedy #31051: IDLE, configdialog, General tab: re-arrange, test user entries http://bugs.python.org/issue31051 opened by terry.reedy #31053: Unnecessary argument in command example http://bugs.python.org/issue31053 opened by cocoatomo #31054: Python 2.7.8 Release does not update the system Path variable http://bugs.python.org/issue31054 opened by Ekrem Saban #31055: All Sphinx generated pages could have a new "Edit This Page" l http://bugs.python.org/issue31055 opened by Paul Hammant #31056: Import Module Not Working According To Documentation Python 3. http://bugs.python.org/issue31056 opened by MrJman006 #31057: pydoc for tempfile.TemporaryDirectory should say it returns th http://bugs.python.org/issue31057 opened by Thomas Thurman #31059: asyncio.StreamReader.read hangs if n<0 http://bugs.python.org/issue31059 opened by s_kostyuk #31061: asyncio segfault when using threadpool and "_asyncio" native m http://bugs.python.org/issue31061 opened by thehesiod #31062: socket.makefile does not handle line buffering http://bugs.python.org/issue31062 opened by kchen #31064: test_ossaudiodev fails under padsp (Linux PulseAudio OSS emula http://bugs.python.org/issue31064 opened by ncoghlan #31065: Documentation for Popen.poll is unclear http://bugs.python.org/issue31065 opened by mark.dickinson #31066: FAIL: test_last_modified (test.test_httpservers.SimpleHTTPServ http://bugs.python.org/issue31066 opened by haypo #31067: test_subprocess.test_leak_fast_process_del_killed() fails rand http://bugs.python.org/issue31067 opened by haypo #31068: test_ttk_guionly hangs on AMD64 Windows8.1 Refleaks 2.7 http://bugs.python.org/issue31068 opened by haypo #31069: test_multiprocessing_spawn leaked a process on AMD64 Windows8. http://bugs.python.org/issue31069 opened by haypo #31070: test_threaded_import: KeyError ignored in _get_module_lock.<lo http://bugs.python.org/issue31070 opened by haypo #31071: Bad error message about maps not iterable http://bugs.python.org/issue31071 opened by Stefan Pochmann Most recent 15 issues with no replies (15) ========================================== #31071: Bad error message about maps not iterable http://bugs.python.org/issue31071 #31070: test_threaded_import: KeyError ignored in _get_module_lock.<lo http://bugs.python.org/issue31070 #31069: test_multiprocessing_spawn leaked a process on AMD64 Windows8. http://bugs.python.org/issue31069 #31068: test_ttk_guionly hangs on AMD64 Windows8.1 Refleaks 2.7 http://bugs.python.org/issue31068 #31062: socket.makefile does not handle line buffering http://bugs.python.org/issue31062 #31059: asyncio.StreamReader.read hangs if n<0 http://bugs.python.org/issue31059 #31054: Python 2.7.8 Release does not update the system Path variable http://bugs.python.org/issue31054 #31053: Unnecessary argument in command example http://bugs.python.org/issue31053 #31050: IDLE, configdialog: Factor out GenTab class from ConfigDialog http://bugs.python.org/issue31050 #31048: ResourceWarning in test_asyncio.test_events.ProactorEventLoopT http://bugs.python.org/issue31048 #31045: Add a language switch to the Python documentation http://bugs.python.org/issue31045 #31040: mimetypes.add_type should complain when you give it an undotte http://bugs.python.org/issue31040 #31039: Python on android must use ashmem instead of shmem http://bugs.python.org/issue31039 #31035: Document order of firing callbacks added with Future.add_done_ http://bugs.python.org/issue31035 #31031: Unify duplicate bits_in_digit and bit_length http://bugs.python.org/issue31031 Most recent 15 issues waiting for review (15) ============================================= #31046: ensurepip does not honour the value of $(prefix) http://bugs.python.org/issue31046 #31021: Clarify programming faq. http://bugs.python.org/issue31021 #31020: Add support for custom compressor in tarfile http://bugs.python.org/issue31020 #31015: PyErr_WriteUnraisable should be more verbose in Python 2.7 http://bugs.python.org/issue31015 #31013: gcc7 throws warning when pymem.h development header is used http://bugs.python.org/issue31013 #30978: str.format_map() silences exceptions in __getitem__ http://bugs.python.org/issue30978 #30950: Convert round() to Arument Clinic http://bugs.python.org/issue30950 #30945: loop.create_server does not detect if the interface is IPv6 en http://bugs.python.org/issue30945 #30937: csv module examples miss newline='' when opening files http://bugs.python.org/issue30937 #30877: possibe typo in json/scanner.py http://bugs.python.org/issue30877 #30872: Update curses docs to Python 3 http://bugs.python.org/issue30872 #30867: Add macro `HAVE_OPENSSL_VERIFY_PARAM` to avoid invalid functio http://bugs.python.org/issue30867 #30863: Rewrite PyUnicode_AsWideChar() and PyUnicode_AsWideCharString( http://bugs.python.org/issue30863 #30860: Consolidate stateful C globals under a single struct. http://bugs.python.org/issue30860 #30828: Out of bounds write in _asyncio_Future_remove_done_callback http://bugs.python.org/issue30828 Top 10 most discussed issues (10) ================================= #31036: building the python docs requires the blurb module http://bugs.python.org/issue31036 27 msgs #30853: IDLE: configdialog -- factor out Tracer subclass http://bugs.python.org/issue30853 16 msgs #30931: Race condition in asyncore may access the wrong dispatcher http://bugs.python.org/issue30931 11 msgs #30985: Set closing variable in asyncore at close http://bugs.python.org/issue30985 11 msgs #30923: Add -Wimplicit-fallthrough=0 to Makefile ? http://bugs.python.org/issue30923 10 msgs #9566: Compilation warnings under x64 Windows http://bugs.python.org/issue9566 8 msgs #5288: tzinfo objects with sub-minute offsets are not supported (e.g. http://bugs.python.org/issue5288 7 msgs #17611: Move unwinding of stack for "pseudo exceptions" from interpret http://bugs.python.org/issue17611 6 msgs #24954: No way to generate or parse timezone as produced by datetime.i http://bugs.python.org/issue24954 6 msgs #26732: multiprocessing sentinel resource leak http://bugs.python.org/issue26732 6 msgs Issues closed (52) ================== #13429: provide __file__ to extension init function http://bugs.python.org/issue13429 closed by scoder #20657: OpenBSD: Merge patches http://bugs.python.org/issue20657 closed by haypo #25287: test_crypt fails on OpenBSD http://bugs.python.org/issue25287 closed by haypo #26506: [EASY] hex() documentation: mention "%x" % int http://bugs.python.org/issue26506 closed by Mariatta #26642: Replace stdout and stderr with simple standard printers at Pyt http://bugs.python.org/issue26642 closed by haypo #26762: test_multiprocessing_spawn leaves processes running in backgro http://bugs.python.org/issue26762 closed by haypo #28095: test_startup_imports of test_site fails on OS X due to new imp http://bugs.python.org/issue28095 closed by ned.deily #28965: Multiprocessing spawn/forkserver fails to pass Queues http://bugs.python.org/issue28965 closed by pitrou #29403: mock's autospec's behavior on method-bound builtin functions i http://bugs.python.org/issue29403 closed by berker.peksag #29572: Upgrade installers to OpenSSL 1.0.2k http://bugs.python.org/issue29572 closed by ned.deily #29606: urllib FTP protocol stream injection http://bugs.python.org/issue29606 closed by haypo #29972: Skip tests known to fail on AIX http://bugs.python.org/issue29972 closed by haypo #30222: make_zip.py had a bug when setting up full 64 bit distribution http://bugs.python.org/issue30222 closed by steve.dower #30304: TestCase.assertMultiLineEqual only registered for Unicode stri http://bugs.python.org/issue30304 closed by Mariatta #30451: parse windows path error in webbrowser.get() and lead to webbr http://bugs.python.org/issue30451 closed by berker.peksag #30454: Python module cx_Oracle ld installation issue on Solaris11U3 S http://bugs.python.org/issue30454 closed by berker.peksag #30500: [security] urllib connects to a wrong host http://bugs.python.org/issue30500 closed by ned.deily #30595: test_queue_feeder_donot_stop_onexc() of test_multiprocessing_s http://bugs.python.org/issue30595 closed by haypo #30713: Reject newline character (U+000A) in URLs in urllib.parse http://bugs.python.org/issue30713 closed by haypo #30822: Python implementation of datetime module is not being tested c http://bugs.python.org/issue30822 closed by haypo #30850: [2.7] bsddb3: test01_basic_replication() of test_bsddb3 fails http://bugs.python.org/issue30850 closed by haypo #30876: SystemError on importing module from unloaded package http://bugs.python.org/issue30876 closed by serhiy.storchaka #30891: importlib: _find_and_load() race condition on sys.modules[name http://bugs.python.org/issue30891 closed by haypo #30892: _elementtree: assertion error if stdlib copy module is overrid http://bugs.python.org/issue30892 closed by haypo #30907: speed up comparisons to self for built-in containers http://bugs.python.org/issue30907 closed by wbolster #30908: test_os.TestSendfile.test_keywords() leaks dangling threads http://bugs.python.org/issue30908 closed by haypo #30916: Pre-build OpenSSL and Tcl/Tk for Windows http://bugs.python.org/issue30916 closed by steve.dower #30919: Shared Array Memory Allocation Regression http://bugs.python.org/issue30919 closed by pitrou #30939: Sphinx 1.6.3 deprecation warning for sphinx.util.compat.Direct http://bugs.python.org/issue30939 closed by ned.deily #30971: Improve code readability of json.tool http://bugs.python.org/issue30971 closed by rhettinger #30980: Calling asyncore.file_wrapper.close twice may close unrelated http://bugs.python.org/issue30980 closed by haypo #30981: IDLE: Test config dialog font bold button and sample change http://bugs.python.org/issue30981 closed by terry.reedy #30993: IDLE: Document, fix, and complete configdialog font tests http://bugs.python.org/issue30993 closed by terry.reedy #30994: Asyncore does not need to copy map.items() before polling http://bugs.python.org/issue30994 closed by Nir Soffer #30998: faulthandler: Show C stacktrace http://bugs.python.org/issue30998 closed by haypo #31003: IDLE: Add tests for help sources on configdialog general tab http://bugs.python.org/issue31003 closed by terry.reedy #31009: test_multiprocessing_spawn hangs randomly on AMD64 Windows10 3 http://bugs.python.org/issue31009 closed by haypo #31017: gcc 7 fallthrough warnings http://bugs.python.org/issue31017 closed by zach.ware #31018: _tracemalloc frame_t packing optimization not working in Windo http://bugs.python.org/issue31018 closed by haypo #31019: multiprocessing.Pool should join "dead" processes http://bugs.python.org/issue31019 closed by haypo #31023: Git Bootcamp and Cheat Sheet - Section 32.10 - Creating a Pul http://bugs.python.org/issue31023 closed by Mariatta #31025: io.BytesIO: no way to get the length of the underlying buffer http://bugs.python.org/issue31025 closed by rthr #31032: test_ssl http://bugs.python.org/issue31032 closed by christian.heimes #31034: test_subprocess_send_signal() of test_asyncio hangs if SIGHUP http://bugs.python.org/issue31034 closed by haypo #31037: Results in section 4.4 break and continue http://bugs.python.org/issue31037 closed by rhettinger #31043: Tests running twice. http://bugs.python.org/issue31043 closed by inada.naoki #31044: FAIL: test_makedev (test.test_posix.PosixTester) on AMD64 Free http://bugs.python.org/issue31044 closed by haypo #31049: macOS Python package receipts do not have version numbers http://bugs.python.org/issue31049 closed by ned.deily #31052: smtplib not honoring bcc header http://bugs.python.org/issue31052 closed by r.david.murray #31058: FileFinder fails to find modules for import if modules are cre http://bugs.python.org/issue31058 closed by ncoghlan #31060: IDLE: Finish regrouping ConfigDialog methods http://bugs.python.org/issue31060 closed by terry.reedy #31063: List Comprehension Bug http://bugs.python.org/issue31063 closed by tim.peters

2 years, 10 months

Non-stable pyc results on python 3.6

by jan matejek

hello, we're seeing strange problems when trying to do reproducible builds of some python 3.6 modules. Namely, from one build to another, there will be something like the following difference in the compiled object: 00004e40 da 07 5f 5f 61 6c 6c 5f 5f da 0a 5f 5f 61 75 74 |..__all__..__aut| -00004e50 68 6f 72 5f 5f da 07 64 65 63 69 6d 61 6c 72 0c |hor__..decimalr.| +00004e50 68 6f 72 5f 5f 5a 07 64 65 63 69 6d 61 6c 72 0c |hor__Z.decimalr.| 00004e60 00 00 00 72 43 00 00 00 72 08 00 00 00 72 41 00 |...rC...r....rA.| This specific one is in the top-level co_names segment and the 0x5a vs 0xda byte is TYPE_SHORT_ASCII_INTERNED, with FLAG_REF set or unset. I'm also seeing off-by-one differences in reference ids, i.e., the number appearing after TYPE_REF. Not in all cases, but it seems that when a "part" is affected, all references in that "part" are changed (for some value of "part"; all the knowledge of pycs I have was gained from about an hour of reading marshal.c). So that seems to imply that there's a reference that is sometimes included and sometimes not? This is most often found in __init__.py. Often this affects optimized pycs, but we can see it in un-optimized as well. The issue is rare -- 99% of all pycs are stable -- but when it occurs, it's easy to replicate it in the same place. This also happens on different machines, so that seems to rule out hardware memory errors :) The pycs in question are generated by normal "setup.py build" -> "setup.py install". It happens on Python 3.6 but not on Python 2.7. I'm not sure about Python 3.5 because we don't currently use it. It doesn't seem to depend on hash seed - the instability is observed even with PYTHONHASHSEED set to zero. What seems to fix it, however, is running the build on disorderfs, which ensures that the filesystem entries are in the same order. Any ideas why something like this would happen and why would it be correlated with filesystem ordering? thanks m.

2 years, 10 months

Appending a link back to bugs.python.org in GitHub PRs

by Brett Cannon

Thanks to Kushal Das we now have one of the most requested features since the transition: a link in PRs back to bugs.python.org (in a more discoverable way since we have had them since Bedevere launched :) . When a pull request comes in with an issue number in the title (or one gets added), a link to bugs.python.org will be appended to the PR's body (the message you fill out when creating a PR). There's no logic to remove the link if the issue number is removed from the title, changed, or for multiple issue numbers since basically those cases are all rare and it was easier to launch without that kind of support. P.S.: Berker Peksag is working on providing commit emails with diffs in them which is the other most requested feature since the transition.

2 years, 10 months

Am I allowed to use C++-style // comments?

by Devin Jeanpierre

https://www.python.org/dev/peps/pep-0007/ says two things: > Python versions greater than or equal to 3.6 use C89 with several select C99 features: > [...] > C++-style line comments and also: > Never use C++ style // one-line comments. Which is it? -- Devin

2 years, 10 months

RELEASED] Python 3.4.7rc1 and Python 3.5.4rc1 are now available

by Larry Hastings

On behalf of the Python development community and the Python 3.4 and Python 3.5 release teams, I'm relieved to announce the availability of Python 3.4.7rc1 and Python 3.5.4rc1. Python 3.4 is now in "security fixes only" mode. This is the final stage of support for Python 3.4. Python 3.4 now only receives security fixes, not bug fixes, and Python 3.4 releases are source code only--no more official binary installers will be produced. Python 3.5.4 will be the final 3.5 release in "bug fix" mode. After 3.5.4 is released, Python 3.5 will also move into "security fixes mode". Both these releases are "release candidates". They should not be considered the final releases, although the final releases should contain only minor differences. Python users are encouraged to test with these releases and report any problems they encounter. You can find Python 3.4.7rc1 here: https://www.python.org/downloads/release/python-347rc1/ And you can find Python 3.5.4rc1 here: https://www.python.org/downloads/release/python-354rc1/ Python 3.4.7 final and Python 3.5.4 final are both scheduled for release on August 6th, 2017. Happy Pythoning, //arry/

2 years, 10 months

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Python-Dev July 2017