Mailman 3 October 2019 - Python-Dev

[RELEASE] Python 2.7.17 release candidate 1
by Benjamin Peterson Oct. 8, 2019

Oct. 8, 2019

The first release candidate of Python 2.7.17 is now available for download and testing. Python 2.7.17 includes 80 fixes over Python 2.7.16. Downloads may be found on python.org: https://www.python.org/downloads/release/python-2717rc1/ Read the full changelog at: https://raw.githubusercontent.com/python/cpython/1c7b14197b10924e2efc1e6c99… As always with prereleases, please test your applications and libraries and report bugs to: https://bugs.python.org/ A final release is scheduled to follow in 12 days. PEP 373, the Python 2.7 release schedule, calls for 2.7.17 to be the penultimate bug fix release of the Python 2.7 series. Time for Python 2 is running low! Regards, Benjamin 2.7 release manager

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Python Profilers documentation - typo?
by Rob Cliffe Oct. 8, 2019

Oct. 8, 2019

The documentation at https://docs.python.org/3.2/library/profile.html contains the sentence For example, if your_integer_time_func() returns times measured in thousands of seconds, you would construct the Profile instance as follows: "thousands of seconds" should ISTM be "thousandths of a second". There is essentially the same thing in the Python 2 docs at https://docs.python.org/2/library/profile.html viz. For example, if the timer returns times measured in _thousands_ of seconds, the time unit would be |.001|. Just trying for perfection! Best wishes Rob Cliffe

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PEP 587 (Python Initialization Configuration) updated to be future proof again
by Victor Stinner Oct. 8, 2019

Oct. 8, 2019

Hi, I dislike having to do that, but I had to make a last minute change in my PEP 587 "Python Initialization Configuration" to allow to modify the structure in the future without breaking the backward compatibility. I added a "struct_size" field to PyPreConfig and PyConfig: * https://bugs.python.org/issue38304 * https://github.com/python/peps/commit/afa38c0bef7738b8fcc3173daee8488e04208… The example: PyConfig config; PyStatus status = PyConfig_InitPythonConfig(&config); ... must now be written: PyConfig config; config.struct_size = sizeof(PyConfig); PyStatus status = PyConfig_InitPythonConfig(&config); ... At the beginning, I used a private "_config_version" field which was initialized statically by a macro. But it was decided to replace macros with functions. I only noticed today that the conversion to function broke the API/ABI future compatibility. PyConfig_InitPythonConfig() got uninitialized memory and didn't know the size of the config variable. With my change, the function now requires the "struct_size" field to be set, and so it can support internally different versions of the PyConfig structure. Storing the structure size directly in the structure is a common practice in the Windows API which is a good example of long term ABI compatibility. -- By the way, last week, Pablo Galindo Salgado reported to me a regression in PyInstaller caused by the implementation of my PEP. I fixed different issues related to the "Path Configuration" (sys.path in short), but I also added a lot of tests for this code. Previously, there was simply no test on the path configuration! I added a lot of comments to the C code, and I completed the public documentation: https://docs.python.org/dev/c-api/init_config.html#path-configuration Please test the incoming Python 3.8.0rc1 release with your project if you embed Python into your application. Please test also projects like PyInstaller, PyOxidizer, etc. Note: PyInstaller requires my fix for 3.8 (not merged yet): https://github.com/pyinstaller/pyinstaller/pull/4440 Victor -- Night gathers, and now my watch begins. It shall not end until my death.

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Summary of Python tracker Issues
by Python tracker Oct. 4, 2019

Oct. 4, 2019

ACTIVITY SUMMARY (2019-09-27 - 2019-10-04) 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 7060 (+14) closed 43063 (+62) total 50123 (+76) Open issues with patches: 2811 Issues opened (53) ================== #22742: IDLE shows traceback when printing non-BMP character https://bugs.python.org/issue22742 reopened by serhiy.storchaka #37096: Add large-file tests for modules using sendfile(2) https://bugs.python.org/issue37096 reopened by vstinner #38242: Revert the new asyncio Streams API https://bugs.python.org/issue38242 reopened by aeros167 #38243: A reflected XSS in python/Lib/DocXMLRPCServer.py https://bugs.python.org/issue38243 reopened by vstinner #38295: macOS Catalina test failures https://bugs.python.org/issue38295 reopened by terry.reedy #38299: build errors - latest "git pull" https://bugs.python.org/issue38299 opened by grgoffe(a)yahoo.com #38302: __rpow__ not reached when __ipow__ returns NotImplemented https://bugs.python.org/issue38302 opened by DeepSpace #38303: Make audioop PEP-384 compatible https://bugs.python.org/issue38303 opened by Tyler Kieft #38306: High level API for loop.run_in_executor(None, ...)? https://bugs.python.org/issue38306 opened by antoine.pietri #38307: Provide Class' end line in readmodule module https://bugs.python.org/issue38307 opened by aviral #38308: Add optional weighting to statistics.harmonic_mean() https://bugs.python.org/issue38308 opened by rhettinger #38309: Avoid creating duplicate PATH entries with the macOS installer https://bugs.python.org/issue38309 opened by rhettinger #38312: curses: add `set_tabsize` and `set_escdelay` https://bugs.python.org/issue38312 opened by Anthony Sottile #38314: Implement unix read_pipe.is_reading() method https://bugs.python.org/issue38314 opened by asvetlov #38316: docs: Code object's "co_stacksize" field is described with mis https://bugs.python.org/issue38316 opened by pfalcon #38318: Issues linking with ncurses and tinfo (cannot resolve symbols) https://bugs.python.org/issue38318 opened by veremitz #38320: Clarify unittest expectedFailure behaviour in the documentatio https://bugs.python.org/issue38320 opened by Kit Choi2 #38323: test_ayncio: test_close_kill_running() hangs on AMD64 RHEL7 Re https://bugs.python.org/issue38323 opened by vstinner #38324: [Windows] test_locale and test__locale failures on Windows https://bugs.python.org/issue38324 opened by vstinner #38325: [Windows] test_winconsoleio failures https://bugs.python.org/issue38325 opened by vstinner #38328: Speed up the creation time of constant list literals. https://bugs.python.org/issue38328 opened by brandtbucher #38329: macOS python.org installers only add or modify framework Versi https://bugs.python.org/issue38329 opened by KevinPackard #38330: httplib specifies content-length when transfer-encoding presen https://bugs.python.org/issue38330 opened by apmatthews #38331: Exec not recognizing global variables inside function https://bugs.python.org/issue38331 opened by Huyston #38332: invalid content-transfer-encoding in encoded-word causes KeyEr https://bugs.python.org/issue38332 opened by aft90 #38334: zipfile: Seeking encrypted file breaks after seeking backwards https://bugs.python.org/issue38334 opened by dhillier #38335: simplify overlaps function in ipaddress.py https://bugs.python.org/issue38335 opened by Sanjay #38336: Remove the __set__ method restriction on data descriptors for https://bugs.python.org/issue38336 opened by maggyero #38337: inspect: getmembers calls properties https://bugs.python.org/issue38337 opened by jnsdrtlf #38338: [2.7] test_ssl fails on RHEL8 https://bugs.python.org/issue38338 opened by vstinner #38339: [3.5] The doc job of Travis CI fails on Python 3.5: needs at l https://bugs.python.org/issue38339 opened by vstinner #38340: ERROR WHILE BUILDING pyworld for x86_64-linux-gnu-gcc https://bugs.python.org/issue38340 opened by ECAS India #38341: Add SMTPNotSupportedError in the exports of smtplib https://bugs.python.org/issue38341 opened by Norman.Denayer #38344: activate.bat else needs to be on the same line as the if https://bugs.python.org/issue38344 opened by James Abel #38345: Add end lines to pyclbr objects https://bugs.python.org/issue38345 opened by RobertKearns #38346: Wrong behavior when using `assert_called_with` with mutable ob https://bugs.python.org/issue38346 opened by Jim Jeon #38347: pathfix.py does not find Python scripts that have '-' in its f https://bugs.python.org/issue38347 opened by rpluem #38348: Make python -m ast more configurable https://bugs.python.org/issue38348 opened by BTaskaya #38349: Email example using imaginary library installation error. The https://bugs.python.org/issue38349 opened by jackotonye #38350: ./configure --with-pydebug should use -O0 rather than -Og https://bugs.python.org/issue38350 opened by vstinner #38351: Modernize email example from %-formatting to f-string https://bugs.python.org/issue38351 opened by Mariatta #38352: In typing docs, note explicit import needed for IO and Pattern https://bugs.python.org/issue38352 opened by Karl Kornel #38353: Cleanup the path configuration implementation code (getpath.c) https://bugs.python.org/issue38353 opened by vstinner #38354: Fix for bug 30378 regressed SysLogHandler by making it resolve https://bugs.python.org/issue38354 opened by ngie #38355: ntpath.realpath() fails on sys.executable https://bugs.python.org/issue38355 opened by steve.dower #38356: test_asyncio: SubprocessThreadedWatcherTests leaks threads https://bugs.python.org/issue38356 opened by vstinner #38359: pyw.exe opens console window in Windows 10 https://bugs.python.org/issue38359 opened by Andrew Ushakov #38360: single-argument form of -isysroot should be supported https://bugs.python.org/issue38360 opened by jmr #38361: syslog: Default "ident" in syslog.openlog() shouldn't contain https://bugs.python.org/issue38361 opened by vaclavbartos #38364: inspect.iscoroutinefunction / isgeneratorfunction / isasyncgen https://bugs.python.org/issue38364 opened by mjpieters #38367: test_regrtest hanged on AMD64 Windows10 3.x https://bugs.python.org/issue38367 opened by vstinner #38368: Crash when subclassing ctypes.Union https://bugs.python.org/issue38368 opened by oriordan #38371: Tkinter: deprecate the split() method https://bugs.python.org/issue38371 opened by serhiy.storchaka Most recent 15 issues with no replies (15) ========================================== #38371: Tkinter: deprecate the split() method https://bugs.python.org/issue38371 #38367: test_regrtest hanged on AMD64 Windows10 3.x https://bugs.python.org/issue38367 #38364: inspect.iscoroutinefunction / isgeneratorfunction / isasyncgen https://bugs.python.org/issue38364 #38361: syslog: Default "ident" in syslog.openlog() shouldn't contain https://bugs.python.org/issue38361 #38360: single-argument form of -isysroot should be supported https://bugs.python.org/issue38360 #38347: pathfix.py does not find Python scripts that have '-' in its f https://bugs.python.org/issue38347 #38345: Add end lines to pyclbr objects https://bugs.python.org/issue38345 #38341: Add SMTPNotSupportedError in the exports of smtplib https://bugs.python.org/issue38341 #38335: simplify overlaps function in ipaddress.py https://bugs.python.org/issue38335 #38334: zipfile: Seeking encrypted file breaks after seeking backwards https://bugs.python.org/issue38334 #38330: httplib specifies content-length when transfer-encoding presen https://bugs.python.org/issue38330 #38323: test_ayncio: test_close_kill_running() hangs on AMD64 RHEL7 Re https://bugs.python.org/issue38323 #38320: Clarify unittest expectedFailure behaviour in the documentatio https://bugs.python.org/issue38320 #38309: Avoid creating duplicate PATH entries with the macOS installer https://bugs.python.org/issue38309 #38303: Make audioop PEP-384 compatible https://bugs.python.org/issue38303 Most recent 15 issues waiting for review (15) ============================================= #38371: Tkinter: deprecate the split() method https://bugs.python.org/issue38371 #38359: pyw.exe opens console window in Windows 10 https://bugs.python.org/issue38359 #38356: test_asyncio: SubprocessThreadedWatcherTests leaks threads https://bugs.python.org/issue38356 #38355: ntpath.realpath() fails on sys.executable https://bugs.python.org/issue38355 #38353: Cleanup the path configuration implementation code (getpath.c) https://bugs.python.org/issue38353 #38350: ./configure --with-pydebug should use -O0 rather than -Og https://bugs.python.org/issue38350 #38348: Make python -m ast more configurable https://bugs.python.org/issue38348 #38347: pathfix.py does not find Python scripts that have '-' in its f https://bugs.python.org/issue38347 #38345: Add end lines to pyclbr objects https://bugs.python.org/issue38345 #38344: activate.bat else needs to be on the same line as the if https://bugs.python.org/issue38344 #38341: Add SMTPNotSupportedError in the exports of smtplib https://bugs.python.org/issue38341 #38339: [3.5] The doc job of Travis CI fails on Python 3.5: needs at l https://bugs.python.org/issue38339 #38338: [2.7] test_ssl fails on RHEL8 https://bugs.python.org/issue38338 #38337: inspect: getmembers calls properties https://bugs.python.org/issue38337 #38336: Remove the __set__ method restriction on data descriptors for https://bugs.python.org/issue38336 Top 10 most discussed issues (10) ================================= #38006: Crash in remove() weak reference callback of weakref.WeakValue https://bugs.python.org/issue38006 47 msgs #38351: Modernize email example from %-formatting to f-string https://bugs.python.org/issue38351 12 msgs #38243: A reflected XSS in python/Lib/DocXMLRPCServer.py https://bugs.python.org/issue38243 9 msgs #38350: ./configure --with-pydebug should use -O0 rather than -Og https://bugs.python.org/issue38350 9 msgs #38353: Cleanup the path configuration implementation code (getpath.c) https://bugs.python.org/issue38353 9 msgs #38242: Revert the new asyncio Streams API https://bugs.python.org/issue38242 8 msgs #37096: Add large-file tests for modules using sendfile(2) https://bugs.python.org/issue37096 7 msgs #38216: Fix for issue30458 (HTTP Header Injection) prevents crafting i https://bugs.python.org/issue38216 7 msgs #38346: Wrong behavior when using `assert_called_with` with mutable ob https://bugs.python.org/issue38346 6 msgs #38337: inspect: getmembers calls properties https://bugs.python.org/issue38337 5 msgs Issues closed (58) ================== #20504: cgi.FieldStorage, multipart, missing Content-Length https://bugs.python.org/issue20504 closed by ned.deily #26093: __qualname__ different when calling generator object w/ functi https://bugs.python.org/issue26093 closed by corona10 #30019: IDLE freezes when opening a file with astral characters https://bugs.python.org/issue30019 closed by serhiy.storchaka #30773: async generator receives wrong value when shared between corou https://bugs.python.org/issue30773 closed by yselivanov #32689: shutil.move raises AttributeError if first argument is a pathl https://bugs.python.org/issue32689 closed by gvanrossum #36670: regrtest: win_utils decodes typeperf output from the wrong enc https://bugs.python.org/issue36670 closed by vstinner #37146: opcode cache for LOAD_GLOBAL emits false alarm in memory leak https://bugs.python.org/issue37146 closed by vstinner #37245: Azure Pipeline 3.8 CI: multiple tests hung and timed out on ma https://bugs.python.org/issue37245 closed by vstinner #37474: Should Py_Initialize() control the floating point mode? https://bugs.python.org/issue37474 closed by vstinner #37507: multiprocessing: Add a stop() method to ForkServer https://bugs.python.org/issue37507 closed by vstinner #37725: "make clean" should remove PGO task data https://bugs.python.org/issue37725 closed by nascheme #38019: asyncio subprocess AttributeError: 'NoneType' object has no at https://bugs.python.org/issue38019 closed by asvetlov #38093: Update MagicMock __aenter__ and __aexit__ to return AsyncMock' https://bugs.python.org/issue38093 closed by lisroach #38106: [2.7] Race in PyThread_release_lock on macOS - can lead to mem https://bugs.python.org/issue38106 closed by vstinner #38108: Everything in Mock should inherit from Base https://bugs.python.org/issue38108 closed by lisroach #38115: Invalid bytecode offsets in co_lnotab https://bugs.python.org/issue38115 closed by gregory.p.smith #38136: Remove AsyncMock.assert_awaited_* https://bugs.python.org/issue38136 closed by lisroach #38163: AsyncMock child mocks should detect their type https://bugs.python.org/issue38163 closed by lisroach #38164: polishing asyncio Streams API https://bugs.python.org/issue38164 closed by aeros167 #38190: regrtest: test suite completes but Tests Result is not display https://bugs.python.org/issue38190 closed by vstinner #38205: Py_UNREACHABLE() no longer behaves as a function call https://bugs.python.org/issue38205 closed by vstinner #38235: Docs of logging module says argument is named "lvl". TypeError https://bugs.python.org/issue38235 closed by vinay.sajip #38248: inconsistency in asyncio.Task between cancellation while runni https://bugs.python.org/issue38248 closed by yselivanov #38266: Revert bpo-37878: Make PyThreadState_DeleteCurrent() Internal https://bugs.python.org/issue38266 closed by vstinner #38270: Tests: Avoid MD5 or check for MD5 availablity https://bugs.python.org/issue38270 closed by christian.heimes #38277: Allowing conditions with assignment expressions in comprehensi https://bugs.python.org/issue38277 closed by gvanrossum #38280: Add support to compile to native binary like as with golang https://bugs.python.org/issue38280 closed by terry.reedy #38284: signal.sigwait* do not intercept certain signals https://bugs.python.org/issue38284 closed by pitrou #38292: tkinter variable classes don't link to widget if matplotlib's https://bugs.python.org/issue38292 closed by terry.reedy #38296: unittest expectedFailure does not differentiate errors from fa https://bugs.python.org/issue38296 closed by terry.reedy #38297: Imports at top of module is often not used https://bugs.python.org/issue38297 closed by brett.cannon #38298: Base class of generic type has wrong `cls` argument in classme https://bugs.python.org/issue38298 closed by levkivskyi #38300: Documentation says destuction of TemporaryDirectory object wil https://bugs.python.org/issue38300 closed by iarp #38301: If "_REENTRANT" is defined in the header file, we should use " https://bugs.python.org/issue38301 closed by jcea #38304: PEP 587 implementation is not ABI forward compatible https://bugs.python.org/issue38304 closed by vstinner #38305: https://2.python-requests.org/ missing TLS certicate https://bugs.python.org/issue38305 closed by ned.deily #38310: Opcode predictions for asserts, class definitions, and some ca https://bugs.python.org/issue38310 closed by rhettinger #38311: Building with macoS system SQLite3 generates sqlite3_enable_sh https://bugs.python.org/issue38311 closed by ned.deily #38313: Crash/No start https://bugs.python.org/issue38313 closed by zach.ware #38315: Provide defaultdict variant that passes key to default_factory https://bugs.python.org/issue38315 closed by rhettinger #38317: PyConfig (PEP 587): PyConfig.warnoptions should have the highe https://bugs.python.org/issue38317 closed by vstinner #38319: shutil.copyfile(): os.sendfile() fails with OverflowError on 3 https://bugs.python.org/issue38319 closed by vstinner #38321: Compiler warnings when building Python 3.8 https://bugs.python.org/issue38321 closed by vstinner #38322: Azure Pipelines: appx tests fail: init_fs_encoding: failed to https://bugs.python.org/issue38322 closed by steve.dower #38326: Concerns with the last minute changes to the PEP 587 API https://bugs.python.org/issue38326 closed by vstinner #38327: Creating set with empty string returns empty set https://bugs.python.org/issue38327 closed by ammar2 #38333: add type signatures to library function docs https://bugs.python.org/issue38333 closed by gvanrossum #38342: ImportError: cannot import name 'MetadataPathFinder' from 'imp https://bugs.python.org/issue38342 closed by brett.cannon #38343: Version name in PC/layout read incorrectly for RC https://bugs.python.org/issue38343 closed by steve.dower #38357: print adding extra bytes in hex above x7F https://bugs.python.org/issue38357 closed by ammar2 #38358: ASSERTION ERROR WHILE USING TENSORFLOW https://bugs.python.org/issue38358 closed by serhiy.storchaka #38362: platform.system() comparison problem https://bugs.python.org/issue38362 closed by steven.daprano #38363: No Module named ..." and UTF-8 Byte Order Marks https://bugs.python.org/issue38363 closed by steven.daprano #38365: Issue 38363 - False Alarm - Sorry! https://bugs.python.org/issue38365 closed by steven.daprano #38366: dataclasses: generate the _hash_action table from the if-else https://bugs.python.org/issue38366 closed by eric.smith #38369: Python 3.7.4 venv command does not install pip https://bugs.python.org/issue38369 closed by paul.moore #38370: An array as attribute of an object is shared between instances https://bugs.python.org/issue38370 closed by mark.dickinson #38372: Undefined behavior when changing dict while iterating it https://bugs.python.org/issue38372 closed by bboneva

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Currently working on the release of Python 3.8.0rc1
by Łukasz Langa Oct. 3, 2019

Oct. 3, 2019

Team, amazing job on getting us back on track over the weekend. Thank you All release blockers and deferred release blockers solved. And there was relatively little additional activity on the branch -- as expected at this point! Thank you for this, it will help get the release candidate out on time. I'm working on cutting RC1 today Hopefully all sanity checks, as well as building the source tarball and the binary installers for macOS and Windows will all work out fine and we'll be seeing RC1 out tonight. RC2 and the date of 3.8.0 gold If we manage to avoid the need for RC2, we will be able to release 3.8.0 on October 14th. If we need an RC2, that will slip by a week. I hope we won't. Ideally RC1 should be identical codewise to 3.8.0. To help our chances, please avoid any source-related activity on the 3.8 branch from now until the release of 3.8.0. Yes, that also counts for bug fixes unless they are critical. (Yeah, it might be a bit annoying but nobody wants to be the person who introduced a last minute regression in a major release.) Note I didn't say I forbid any activity. I have no power over you, actually. More importantly though, I trust your judgement if you assess some bug is bad enough the fix absolutely has to get into 3.8.0. Moreover, I specifically said source-related activity because... 3.8.0 is important. To some users it will be the first and the last release in the 3.8 series they will see. We need you to focus on the docs now Are all your changes properly documented? Did you notice other changes you know of to have insufficient documentation? Can you help with the "What's New" document? anxiously configure-&&-makingly y'rs - Ł

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The PSF's new Code of Conduct and how it applies to Python's development
by Brett Cannon Oct. 2, 2019

Oct. 2, 2019

[this is being emailed out to python-committer and python-dev separately, so apologies for those who get a duplicate email] The steering council wanted to let everyone know that the PSF released a new Code of Conduct which was announced at https://pyfound.blogspot.com/2019/09/the-python-software-foundation-has_24.… and that it applies to Python's development. Specifically, this new Code of Conduct lists Python's development spaces and those participating in those spaces as being under the CoC (we were implicitly under the old CoC on PSF-sponsored and run infrastructure, but now it's explicitly called out). So that means python-committers, python-dev, python-ideas, everything on GitHub, discuss.python.org, core dev sprints, PSF-sponsored conferences, etc. all fall under this CoC. The steering council wanted to make sure people were aware of this new Code of Conduct so no one was caught off-guard and to make sure people were aware that it did apply to all of us. The steering council also supports this Code of Conduct. One other thing the steering council wanted to point out is that we believe CoC violations should be reported directly to the Conduct WG as outlined at https://www.python.org/psf/conduct/reporting/. The thinking is that since we all know each other on the development team there's a good chance of a conflict of interest if reports were to go to the steering council, and so it's simpler to just advise people go straight to the Conduct WG (Carol and I will recuse ourselves as appropriate since we are both on the Conduct WG). I will also say that people have come to me personally in the past and asked if something was a CoC violation, and going forward my answer will be "report it to the Conduct WG and let them make that decision". Same goes for incidents where people believe something is a CoC violation and they want to report it to someone: let the Conduct WG know (which I have already started telling people who come to me with CoC concerns).

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New CoC link in footer
by Barry Warsaw Oct. 2, 2019

Oct. 2, 2019

This is mostly just a test of the new python-dev footer. We’ve added a link to the CoC into the footer of the message… hopeful! -Barry

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[RELEASE] Python 3.7.5rc1 is now available for testing
by Ned Deily Oct. 1, 2019

Oct. 1, 2019

Python 3.7.5rc1 is now available for testing. 3.7.5rc1 is the release preview of the next maintenance release of Python 3.7, the latest feature release of Python. Assuming no critical problems are found prior to 2019-10-14, no code changes are planned between now and the final release. This release candidate is intended to give you the opportunity to test the new security and bug fixes in 3.7.5. We strongly encourage you to test your projects and report issues found to bugs.python.org as soon as possible. Please keep in mind that this is a preview release and, thus, its use is not recommended for production environments. You can find the release files, a link to the changelog, and more information here: https://www.python.org/downloads/release/python-375rc1/ -- Ned Deily nad(a)python.org -- []

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PEP 605: A rolling feature release stream for CPython
by Nick Coghlan Oct. 1, 2019

Oct. 1, 2019

Hi folks, Steve Dower and I have put together a proposal to try to reduce feature delivery latency by changing our pre-release management process such that beta releases are considered production ready. The preferred discussion thread for that PEP is on Discourse here: https://discuss.python.org/t/pep-605-a-rolling-feature-release-stream-for-c… (Note: there are already some updates pending based on the initial feedback in the thread, so folks may want to skim the thread before reading the full PEP) Cheers, Nick. -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia

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[RELEASE] Python 3.8.0rc1 is now available
by Łukasz Langa Oct. 1, 2019

Oct. 1, 2019

Python 3.8.0 is almost ready. After a rather tumultuous few days, we are very happy to announce the availability of the release candidate: https://www.python.org/downloads/release/python-380rc1/ <https://www.python.org/downloads/release/python-380rc1/> This release, 3.8.0rc1, is the final planned release preview. Assuming no critical problems are found prior to 2019-10-14, the scheduled release date for 3.8.0, no code changes are planned between this release candidate and the final release. Please keep in mind that this is not the gold release yet and as such its use is not recommended for production environments. Major new features of the 3.8 series, compared to 3.7 Some of the new major new features and changes in Python 3.8 are: PEP 572 <https://www.python.org/dev/peps/pep-0572/>, Assignment expressions PEP 570 <https://www.python.org/dev/peps/pep-0570/>, Positional-only arguments PEP 587 <https://www.python.org/dev/peps/pep-0587/>, Python Initialization Configuration (improved embedding) PEP 590 <https://www.python.org/dev/peps/pep-0590/>, Vectorcall: a fast calling protocol for CPython PEP 578 <https://www.python.org/dev/peps/pep-0578>, Runtime audit hooks PEP 574 <https://www.python.org/dev/peps/pep-0574>, Pickle protocol 5 with out-of-band data Typing-related: PEP 591 <https://www.python.org/dev/peps/pep-0591> (Final qualifier), PEP 586 <https://www.python.org/dev/peps/pep-0586> (Literal types), and PEP 589 <https://www.python.org/dev/peps/pep-0589> (TypedDict) Parallel filesystem cache for compiled bytecode Debug builds share ABI as release builds f-strings support a handy = specifier for debugging continue is now legal in finally: blocks on Windows, the default asyncio event loop is now ProactorEventLoop on macOS, the spawn start method is now used by default in multiprocessing multiprocessing can now use shared memory segments to avoid pickling costs between processes typed_ast is merged back to CPython LOAD_GLOBAL is now 40% faster pickle now uses Protocol 4 by default, improving performance (Hey, fellow core developer, if a feature you find important is missing from this list, let Łukasz know <mailto:lukasz@python.org>.) Call to action: focus on the docs now Are all your changes properly documented? Did you notice other changes you know of to have insufficient documentation? Can you help with the “What’s New <https://docs.python.org/3.8/whatsnew/3.8.html>” document? - Ł

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