Mailman 3 November 2019 - Python-Dev

Following up stories about beginning contribution
by Tal Einat Nov. 12, 2019

Nov. 12, 2019

Hello everyone, Following up my request for such stories in early August[1], I have received 10 such stories which may be shared publicly, and several more in private. As a first step, I've create a repository[2] with all of the publicly available stories, so that they are easily accessible and readable from a single location. I have made sure to collected written consent from all authors to use these stories publicly. Hence, everything there is published under the CC 4.0 license, with attribution to the original author and a link to the original post/message/tweet. *If any author is uncomfortable with these publication terms, please let me know ASAP!* My next step will be to read through the stories again recognize common and obviously critical problems or patterns. I'll publish those findings and plan to follow up with a structured survey in hope of collecting information and opinions specific to those issues from a larger number of people. Then, hopefully, we'll have a solid foundation for making improvements. .. [1]: https://mail.python.org/archives/list/core-mentorship@python.org/message/JS… .. [2]: https://github.com/taleinat/python-contribution-feedback

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Steering Council Update (July through October)
by Ewa Jodlowska Nov. 10, 2019

Nov. 10, 2019

Hey folks - Here is an update from the Steering Council. It covers July through October. The update has been added to the Steering Council repo as well: https://github.com/python/steering-council/blob/master/updates/2019-11-09-s… . # Steering Council Community Update July 2019 through October 2019 ## July recap: - PSF and the Steering Council worked on a proposal to hire a project manager to help with Python 2 EOL communication. The proposal was approved by the PSF Board and Changeset Consulting was contracted to help with this work. Progress is being tracked [here]( https://github.com/orgs/python/projects/1#card-26091749) - Release cadence discussions happened. - [PEP 1](https://www.python.org/dev/peps/pep-0001/)’s copyright/license section was updated to include a dual license of public domain and CC0-1.0-Universal. ## August recap: - [PEP 572](https://www.python.org/dev/peps/pep-0572/) was updated to replace `TargetScopeError` to `SyntaxError`: https://github.com/python/peps/commit/cd292d89972476fa485a8ac1b14c1ed85b8c4… - Vision document review and update happened. - Release cadence discussions happened. - Steering Council helped answer inquiries about proposed Python 2 EOL page. - Steering Council reviewed the newly approved PSF Code of Conduct. ## September recap: - Slide deck “Vision Doc” was created based off of the original Vision Document and was discussed by the Steering Council. The Steering Council decided to continue in this direction. - The Steering Council discussed the Core Dev promotion topic and it was suggested by the Steering Council that the Core Devs create a Work Group to work on that: https://discuss.python.org/t/concerns-about-how-we-vote-on-new-core-develop… - A timeline was selected for the Steering Council election and informed the Core Devs: https://mail.python.org/archives/list/python-committers@python.org/thread/P… - Release cadence discussions happened - [Core Dev Sprint in London recap]( http://pyfound.blogspot.com/2019/10/cpython-core-developer-sprint-2019.html) ## October recap: - Steering Council discussed the new Code of Conduct and agreed that it should be sent out to the python-committers@ and python-dev@ mailing lists: https://mail.python.org/archives/list/python-committers@python.org/thread/6… - Steering Council plans on presenting the Vision Deck at PyCon pending any changes made by future Steering Council. - Steering Council discussed the proposal made by [Thomas Wouters]( https://mail.python.org/archives/list/python-committers@python.org/thread/U…) for approval voting. The Steering Council guided Thomas in the direction of a [PR](https://github.com/python/peps/pull/1197) and a formal vote. That resulted in a change to [PEP 13](https://www.python.org/dev/peps/pep-0013/) stating core team members can vote for zero or more of the candidates for the Steering Council. - Steering Council discussed communal ownership of Python repo. It was decided that the Steering Council will send an email to python-committers about the topic. Brett sent the email on Nov 6: https://mail.python.org/archives/list/python-committers@python.org/message/… . - Steering Council met with GitHub team about the b.p.o. migration, PEP [581](https://www.python.org/dev/peps/pep-0581/)/[588]( https://www.python.org/dev/peps/pep-0588/) plan and discussed next steps. Next steps for Python include finding a point person to lead the work (will be a project manager), the Steering Council to find out more information about search features and how mapping will work. - The SC reviewed and discussed PEP 602 (1 year release cycle proposal by Łukasz Langa) and PEP 605 (Nick Coghlan and Steve Dower's 2 year proposal) and selected [PEP 602](https://www.python.org/dev/peps/pep-0602/). - [PEP 484](https://www.python.org/dev/peps/pep-0484/) policy for inclusion of stubs in typeshed was discussed and the [PR]( https://github.com/python/peps/pull/1218/) around it. It was decided that a sentence would be changed to make type stubs an opt-out situation and not opt-in. - [PEP 608](https://www.python.org/dev/peps/pep-0608/) and [discussion]( https://discuss.python.org/t/rfc-pep-608-coordinated-python-release/2539) were reviewed by the Steering Council. It was decided that the PEP as is would be rejected, but that the buildbot CI option will work. Nick has responded to the [discussion on Discourse]( https://discuss.python.org/t/rfc-pep-608-coordinated-python-release/2539/22) with the decision and suggestion. - It was decided that Ewa will help put together the Community Updates so they happen monthly. Thank you, Ewa ----------------------- *As a non-profit organization, the PSF depends on sponsorships and donations to support the Python community. Check out our Annual Impact Report for more details: https://www.python.org/psf/annual-report/2019/ <https://www.python.org/psf/annual-report/2019/>* *Please contribute to PSF; we can't continue our work without your support! https://www.python.org/psf/donations/ <https://www.python.org/psf/donations/>*

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Compiling Python with SQLite when SQLite is in an arbitrary place
by Coirier, Emmanuel Nov. 8, 2019

Nov. 8, 2019

Hello everyone, I've created an issue some months ago of what I considered as bug : https://bugs.python.org/issue37784 that I have now closed since it is not relevant. To sum up, when the SQLite binaries are not in a standard place, it seemed for me to be impossible to include sqlite into Python. In the end, I noticed I missed the CPPFLAGS env variable, that I thought was for C++ compilation. So why is the setup.py looking into the CPPFLAGS variable instead of the CFLAGS variable ? Best regards, -- Emmanuel Coirier Interne Ce message et toutes les pièces jointes (ci-après le «message») sont confidentiels et établis à l’intention exclusive de ses destinataires. Toute utilisation de ce message non conforme à sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. Si vous recevez ce message par erreur, merci de le détruire sans en conserver de copie et d’en avertir immédiatement l’expéditeur. Internet ne permettant pas de garantir l’intégrité de ce message, la Caisse des Dépôts et Consignations décline toute responsabilité au titre de ce message s’il a été modifié, altéré, déformé ou falsifié. Par ailleurs et malgré toutes les précautions prises pour éviter la présence de virus dans nos envois, nous vous recommandons de prendre, de votre côté, les mesures permettant d'assurer la non-introduction de virus dans votre système informatique. This email message and any attachments (“the email”) are confidential and intended only for the recipient(s) indicated. If you are not an intended recipient, please be advised that any use, dissemination, forwarding or copying of this email whatsoever is prohibited without prior written consent of Caisse des Depots et Consignations. If you have received this email in error, please delete it without saving a copy and notify the sender immediately. Internet emails are not necessarily secure, and Caisse des Depots et Consignations declines responsibility for any changes that may have been made to this email after it was sent. While we take all reasonable precautions to ensure that viruses are not transmitted via emails, we recommend that you take your own measures to prevent viruses from entering your computer system.

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Summary of Python tracker Issues
by Python tracker Nov. 8, 2019

Nov. 8, 2019

ACTIVITY SUMMARY (2019-11-01 - 2019-11-08) 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 7140 (+49) closed 43359 (+34) total 50499 (+83) Open issues with patches: 2809 Issues opened (64) ================== #16575: ctypes: unions as arguments https://bugs.python.org/issue16575 reopened by vstinner #37527: Timestamp conversion on windows fails with timestamps close to https://bugs.python.org/issue37527 reopened by p-ganssle #38668: Update os.path documentation regarding recommended types https://bugs.python.org/issue38668 opened by lazka #38669: patch.object should raise another error when first argument is https://bugs.python.org/issue38669 opened by Elena.Oat #38670: can we accept os.PathLike objects within the subprocess args= https://bugs.python.org/issue38670 opened by gregory.p.smith #38671: pathlib.Path.resolve(strict=False) returns relative path on Wi https://bugs.python.org/issue38671 opened by uranusjr #38672: Crash on mimetypes.init() if there is no access to one of know https://bugs.python.org/issue38672 opened by Michał Szymaniak #38673: REPL shows continuation prompt (...) when comment or space ent https://bugs.python.org/issue38673 opened by gvanrossum #38675: Sug. for the scope example in TPT Chapter 9 https://bugs.python.org/issue38675 opened by David Goldsmith #38677: Arraymodule initialization error handling improvements https://bugs.python.org/issue38677 opened by mpaolini #38678: TypeError raised trying to run TPT 10.3 Example 2 in Python 3. https://bugs.python.org/issue38678 opened by David Goldsmith #38679: Scipy and Scikit learn library installation issues https://bugs.python.org/issue38679 opened by marvinmckinneyii #38680: PyGILState_Release does not release gil correctly, resulting i https://bugs.python.org/issue38680 opened by 123 wlpha #38681: 2to3 Conversion Result using BlankLine() can be Syntactically https://bugs.python.org/issue38681 opened by Samuel Tatasurya #38682: struct timeval is not declared https://bugs.python.org/issue38682 opened by Mithil #38686: WWW-Authenticate qop="auth,auth-int" rejected by urllib https://bugs.python.org/issue38686 opened by PypeBros #38687: Expose 'adler32_combine' function from zlib https://bugs.python.org/issue38687 opened by callumattryde #38688: Python 3.8 regression: endless loop in shutil.copytree https://bugs.python.org/issue38688 opened by cboltz #38689: IDLE crashes when KeyError is raised during calltip generation https://bugs.python.org/issue38689 opened by bup #38690: Command line option with &/or without a space results in the s https://bugs.python.org/issue38690 opened by jgors #38691: importlib: PYTHONCASEOK should be ignored when using python3 - https://bugs.python.org/issue38691 opened by vstinner #38692: add a pidfd child process watcher https://bugs.python.org/issue38692 opened by benjamin.peterson #38693: Use f-strings instead of str.format within importlib https://bugs.python.org/issue38693 opened by gregory.p.smith #38695: IDLE should restart instead of hanging when subprocess exits https://bugs.python.org/issue38695 opened by terry.reedy #38697: test.support.find_unused_port() race condition: test_socket fa https://bugs.python.org/issue38697 opened by vstinner #38698: While parsing email message id: UnboundLocalError https://bugs.python.org/issue38698 opened by Nikita Hoffmann #38699: socket: change listen() default backlog from 128 to 4096? https://bugs.python.org/issue38699 opened by vstinner #38701: datetime.timedelta string representation is ambiguous https://bugs.python.org/issue38701 opened by lig #38702: Adding new types to parser/unparse.py https://bugs.python.org/issue38702 opened by ju-sh #38704: Prevent installation on unsupported Windows versions https://bugs.python.org/issue38704 opened by senyai #38706: What should the error message in the exception raised by asser https://bugs.python.org/issue38706 opened by mkarotsieris #38707: Multiprocessing: bug with Native ID for threading.mainthread() https://bugs.python.org/issue38707 opened by jaketesler #38708: parse_message_id in email module is very buggy / crashy https://bugs.python.org/issue38708 opened by xnox #38709: distutils - setuptools - alias command removes comments from s https://bugs.python.org/issue38709 opened by acue #38710: unsynchronized write pointer in io.TextIOWrapper in 'r+' mode https://bugs.python.org/issue38710 opened by Manuel Ignacio Pérez Alcolea #38711: setup parameter 'distclass' ignored for configuration files https://bugs.python.org/issue38711 opened by acue #38712: add signal.pidfd_send_signal https://bugs.python.org/issue38712 opened by benjamin.peterson #38714: setup command alias erroneous for names with hyphens https://bugs.python.org/issue38714 opened by acue #38715: Regression in compileall ddir parameter when recursing https://bugs.python.org/issue38715 opened by hetman #38718: query of global metadata options delivers error messages even https://bugs.python.org/issue38718 opened by acue #38719: Surprising and possibly incorrect passing of InitVar to __post https://bugs.python.org/issue38719 opened by Aaron Ecay #38720: Logging failure with timestamp messages https://bugs.python.org/issue38720 opened by xtobes #38721: modulefinder should use io.open_code() instead of open() https://bugs.python.org/issue38721 opened by plokmijnuhby #38722: runpy should use io.open_code() instead of open() https://bugs.python.org/issue38722 opened by plokmijnuhby #38723: Pdb._runscript should use io.open_code() instead of open() https://bugs.python.org/issue38723 opened by plokmijnuhby #38724: Implement subprocess.Popen.__repr__ https://bugs.python.org/issue38724 opened by cool-RR #38725: Documented equivalent of `gzip -n` (omit timestamp and origina https://bugs.python.org/issue38725 opened by zwol #38726: Add equivalent of `gzip -n` (omit timestamp and original file https://bugs.python.org/issue38726 opened by zwol #38727: setup.py sdist --format=gztar should use (equivalent of) `gzip https://bugs.python.org/issue38727 opened by zwol #38728: Update PC/pyconfig.h to support disabling auto linking https://bugs.python.org/issue38728 opened by Jean-Christophe Fillion-Robin #38729: mock.create_autospec generates incorrect signature for some de https://bugs.python.org/issue38729 opened by breilly_box #38731: bad input crashes py_compile library https://bugs.python.org/issue38731 opened by Kaoru Esashika #38734: Python 3.7 and 3.8 in Windows Store do not start under git bas https://bugs.python.org/issue38734 opened by pletnes #38735: PYTHONPYCACHEPREFIX fails when importing a module from the roo https://bugs.python.org/issue38735 opened by nedbat #38736: argparse: wrong type from get_default when type is set https://bugs.python.org/issue38736 opened by Erik Ahlén #38738: Fix formatting of True and False https://bugs.python.org/issue38738 opened by serhiy.storchaka #38740: Line count mis match between open() vs sys.stdin api calls https://bugs.python.org/issue38740 opened by Thamme Gowda #38741: Definition of multiple ']' in header configparser https://bugs.python.org/issue38741 opened by @mark99i #38742: ElementTree won't parse comments before root element https://bugs.python.org/issue38742 opened by celinecyc #38743: configure: on macOS (darwin) add CoreFoundation to flags befor https://bugs.python.org/issue38743 opened by Jakub Piotr Cłapa #38744: python 3.8 hang in multiprocessing.Pool() locking on FreeBSD https://bugs.python.org/issue38744 opened by AMDmi3 #38746: HTML5 named character references not consistent https://bugs.python.org/issue38746 opened by mikeraider #38747: Slowly introduce a subset of Jupyter console (IPython) feature https://bugs.python.org/issue38747 opened by Marco Sulla #38748: 32 bit ctypes stdcall callback fails to restore stack pointer https://bugs.python.org/issue38748 opened by David Heffernan Most recent 15 issues with no replies (15) ========================================== #38748: 32 bit ctypes stdcall callback fails to restore stack pointer https://bugs.python.org/issue38748 #38747: Slowly introduce a subset of Jupyter console (IPython) feature https://bugs.python.org/issue38747 #38746: HTML5 named character references not consistent https://bugs.python.org/issue38746 #38744: python 3.8 hang in multiprocessing.Pool() locking on FreeBSD https://bugs.python.org/issue38744 #38743: configure: on macOS (darwin) add CoreFoundation to flags befor https://bugs.python.org/issue38743 #38742: ElementTree won't parse comments before root element https://bugs.python.org/issue38742 #38741: Definition of multiple ']' in header configparser https://bugs.python.org/issue38741 #38738: Fix formatting of True and False https://bugs.python.org/issue38738 #38734: Python 3.7 and 3.8 in Windows Store do not start under git bas https://bugs.python.org/issue38734 #38731: bad input crashes py_compile library https://bugs.python.org/issue38731 #38728: Update PC/pyconfig.h to support disabling auto linking https://bugs.python.org/issue38728 #38727: setup.py sdist --format=gztar should use (equivalent of) `gzip https://bugs.python.org/issue38727 #38726: Add equivalent of `gzip -n` (omit timestamp and original file https://bugs.python.org/issue38726 #38725: Documented equivalent of `gzip -n` (omit timestamp and origina https://bugs.python.org/issue38725 #38724: Implement subprocess.Popen.__repr__ https://bugs.python.org/issue38724 Most recent 15 issues waiting for review (15) ============================================= #38743: configure: on macOS (darwin) add CoreFoundation to flags befor https://bugs.python.org/issue38743 #38738: Fix formatting of True and False https://bugs.python.org/issue38738 #38712: add signal.pidfd_send_signal https://bugs.python.org/issue38712 #38707: Multiprocessing: bug with Native ID for threading.mainthread() https://bugs.python.org/issue38707 #38706: What should the error message in the exception raised by asser https://bugs.python.org/issue38706 #38693: Use f-strings instead of str.format within importlib https://bugs.python.org/issue38693 #38692: add a pidfd child process watcher https://bugs.python.org/issue38692 #38687: Expose 'adler32_combine' function from zlib https://bugs.python.org/issue38687 #38686: WWW-Authenticate qop="auth,auth-int" rejected by urllib https://bugs.python.org/issue38686 #38677: Arraymodule initialization error handling improvements https://bugs.python.org/issue38677 #38669: patch.object should raise another error when first argument is https://bugs.python.org/issue38669 #38662: Decouple ensurepip from pip's internals using runpy https://bugs.python.org/issue38662 #38657: Clarify numeric padding behavior in string formatting https://bugs.python.org/issue38657 #38652: Remove/update provisional note for asyncio.BufferedProtocol https://bugs.python.org/issue38652 #38650: Add constantness to PyStructSequence_UnnamedField https://bugs.python.org/issue38650 Top 10 most discussed issues (10) ================================= #37903: IDLE Shell sidebar. https://bugs.python.org/issue37903 18 msgs #32309: Implement asyncio.run_in_executor shortcut https://bugs.python.org/issue32309 16 msgs #38692: add a pidfd child process watcher https://bugs.python.org/issue38692 15 msgs #38706: What should the error message in the exception raised by asser https://bugs.python.org/issue38706 15 msgs #38500: Provide a way to get/set PyInterpreterState.frame_eval without https://bugs.python.org/issue38500 12 msgs #38285: Asyncio BaseEventLoop can support socket types other than SOCK https://bugs.python.org/issue38285 11 msgs #38630: subprocess.Popen.send_signal() should poll the process https://bugs.python.org/issue38630 11 msgs #36906: Compile time textwrap.dedent() equivalent for str or bytes lit https://bugs.python.org/issue36906 10 msgs #38440: Possible new issues with IDLE https://bugs.python.org/issue38440 8 msgs #38608: Undocumented behavior that IsolatedAsyncioTestCase would enabl https://bugs.python.org/issue38608 7 msgs Issues closed (34) ================== #27994: In the argparse help(argparse) prints weird comments instead o https://bugs.python.org/issue27994 closed by rhettinger #35381: posixmodule: convert statically allocated types (DirEntryType https://bugs.python.org/issue35381 closed by petr.viktorin #37633: Py_CompileString and PyParser_SimpleParseString not exported i https://bugs.python.org/issue37633 closed by benjamin.peterson #37784: Compiling Python 3 with sqlite impossible when sqlite installa https://bugs.python.org/issue37784 closed by manuco #38159: PyState_AddModule docs should say that it's not necessary to c https://bugs.python.org/issue38159 closed by petr.viktorin #38279: multiprocessing example enhancement https://bugs.python.org/issue38279 closed by pitrou #38382: statistics.harmonic_mean fails to raise error with negative in https://bugs.python.org/issue38382 closed by rhettinger #38388: Pickle protocol v 5 needs to be documented https://bugs.python.org/issue38388 closed by taleinat #38422: Clarify docstrings of pathlib suffix(es) https://bugs.python.org/issue38422 closed by pitrou #38475: Break Statement https://bugs.python.org/issue38475 closed by zach.ware #38592: Add pt-br to the language switcher at the Python docs website https://bugs.python.org/issue38592 closed by rougeth #38613: Optimize some set operations in dictkeys object https://bugs.python.org/issue38613 closed by inada.naoki #38664: await execution order leads to throw or bad syntax https://bugs.python.org/issue38664 closed by asvetlov #38666: is for tuples https://bugs.python.org/issue38666 closed by benjamin.peterson #38667: PYTHONCOERCECLOCALE=0 ignored https://bugs.python.org/issue38667 closed by lazka #38674: RotatingFileHandler issue: logs in the file are printed in inc https://bugs.python.org/issue38674 closed by vinay.sajip #38676: Unable to install Python 3.8 on Windows 10 https://bugs.python.org/issue38676 closed by BRT #38683: Installation failed - no privileges to access directory https://bugs.python.org/issue38683 closed by steve.dower #38684: hashlib: build fails when blake2 is disabled in OpenSSL https://bugs.python.org/issue38684 closed by christian.heimes #38685: can't create a venv with a dash in the name https://bugs.python.org/issue38685 closed by matrixise #38694: docs.python.org does not switch version properly https://bugs.python.org/issue38694 closed by ned.deily #38696: HTTP modules documentation error https://bugs.python.org/issue38696 closed by zach.ware #38700: typo in unittest mock docs https://bugs.python.org/issue38700 closed by Arunkumar Mani #38703: should we expect round(0.95,1) to be 1.0, instead of 0.9? https://bugs.python.org/issue38703 closed by mark.dickinson #38705: venv creation on macOS Catalina is failing https://bugs.python.org/issue38705 closed by ned.deily #38713: expose P_PIDFD https://bugs.python.org/issue38713 closed by miss-islington #38716: logging: rotating handlers set namer and rotator null https://bugs.python.org/issue38716 closed by vinay.sajip #38717: csv DictWriter's internal _dict_to_list raise error unsupporte https://bugs.python.org/issue38717 closed by afflictor #38730: 2.7 modern compiler warnings https://bugs.python.org/issue38730 closed by benjamin.peterson #38732: Adding relp support as a new logging handler https://bugs.python.org/issue38732 closed by vinay.sajip #38733: PyErr_Occurred(): tstate must be non-NULL https://bugs.python.org/issue38733 closed by vstinner #38737: StreamReaderProtocol.eof_received() should return True only fo https://bugs.python.org/issue38737 closed by asvetlov #38739: pyperformance html5lib cannot import Mapping (and fails) https://bugs.python.org/issue38739 closed by vstinner #38745: pygame install error using python 3.8.0 https://bugs.python.org/issue38745 closed by christian.heimes

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Rejecting PEP 497
by Brett Cannon Nov. 7, 2019

Nov. 7, 2019

Thanks to Ed for writing the PEP, but the steering council decided to reject PEP 497. The website has not caught up to the rejection notice as I type this, but we rejected https://www.python.org/dev/peps/pep-0497/ due to the `__past__` concept being too much work for what would be gained (we seem to be doing fine without it). As for the tighter request for providing backwards-compatibility, that can be subsumed into PEP 387.

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Do not fallback to __trunc__ when convert to int
by Serhiy Storchaka Nov. 5, 2019

Nov. 5, 2019

Currently __trunc__ is used for two purposes: * In math.trunc() which just calls __trunc__. * In int() and PyNumber_Long() as a fallback if neither __int__ nor __index__ are implemented. Unlike to __int__ and __index__ there is not a slot corresponding to __trunc__. So using it is slower than using __int__ or __index__. float and Decimal implement __int__ and __trunc__ by the same code. Only Fraction implements __trunc__ but not __int__. I propose to deprecate the falling back to __trunc__ for converting to int and remove it in future. Fraction should implement __int__. We cannot use __trunc__ for setting the nb_int slot because it can return non-int.

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A much better tokenize.untokenize function
by Edward K. Ream Nov. 4, 2019

Nov. 4, 2019

I am creating this post as a courtesy to anyone interested in python's tokenize module. **tl;dr:** Various posts, linked below, discuss a much better replacement for untokenize. Do with it as you will. This code is very unlikely to be buggy. *Please* let me know if you find problems with it. **About the new untokenize** This post: https://groups.google.com/d/msg/leo-editor/DpZ2cMS03WE/VPqtB9lTEAAJ announces a replacement for the untokenize function in tokenize.py: https://github.com/python/cpython/blob/3.8/Lib/tokenize.py To summarize this post: I have "discovered" a spectacular replacement for Untokenizer.untokenize in python's tokenize library module: - The wretched, buggy, and impossible-to-fix add_whitespace method is gone. - The new code has no significant 'if' statements, and knows almost nothing about tokens! As I see it, the only possible failure modes might involve the zero-length line 0. See the above post for a full discussion. **Testing** This post: https://groups.google.com/d/msg/leo-editor/DpZ2cMS03WE/5X8IDzpgEAAJ discusses testing issues. Imo, the new code should easily pass all existing unit tests. The new code also passes a new unit test for Python issue 38663: https://bugs.python.org/issue38663, something existing tests fail to do, even in "compatibility mode" (2-tuples) . Imo, the way is now clear for proper unit testing of python's Untokenize class. In particular, it is, imo, time to remove compatibility mode. This hack has masked serious issues with untokenize: https://bugs.python.org/issue?%40columns=id%2Cactivity%2Ctitle%2Ccreator%2C… **Summary** The new untokenize is the way it is written in The Book. I have done the heavy lifting on issue 38663. Python devs are free to do with it as they like. Your choice will not affect me or Leo in any way. The new code will soon become the foundation of Leo's token-oriented commands. Edward P.S. I would imagine that tokenize.untokenize is pretty much off most dev's radar :-) This Engineering Notebook post:https://groups.google.com/d/msg/leo-editor/aivhFnXW85Q/b2a8GHvEDwAJ discusses (in way too much detail :-) why untokenize is important to me. To summarize that post: Imo, python devs are biased in favor of parse trees in programs involving text manipulations. I assert that the "real" black and fstringify tools would be significantly simpler, clearer and faster if they used python's tokenize module instead of python's ast module. Leo's own "beautify" and "fstringify" commands prove my assertion to my own satisfaction. This opinion will be controversial, so I want to make the strongest possible case. I need to prove that handling tokens can be done simply and correctly in all cases. This is a big ask, because python's tokens are complicated. See the Lexical Analysis section of the Python Language Reference. The new untokenize furnishes the required proof, and does so elegantly. EKR

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Accepting PEP 602 -- Annual Release Cycle for Python
by Brett Cannon Nov. 2, 2019

Nov. 2, 2019

On behalf of the steering council I am happy to announce that as BDFL-Delegate I am accepting PEP 602 to move us to an annual release schedule (gated on a planned update; see below). The steering council thinks that having a consistent schedule every year when we hit beta, RC, and final it will help the community: * Know when to start testing the beta to provide feedback * Known when the expect the RC so the community can prepare their projects for the final release * Know when the final release will occur to coordinate their own releases (if necessary) when the final release of Python occurs * Allow core developers to more easily plan their work to make sure work lands in the release they are targeting * Make sure that core developers and the community have a shorter amount of time to wait for new features to be released The acceptance is gated on Łukasz updating PEP 602 to reflect a planned shift in scheduling (he's been busy with a release of Black): * 3 months for betas instead of 2 * 2 months for RCs instead of 1 This was discussed on https://discuss.python.org in order to give the community enough time to provide feedback in the betas while having enough time to thoroughly test the RC and to prep for the final release so the delay from Python's final release to any new project releases is minimal. It should also fit into the release schedule of Linux distributions like Fedora better than previously proposed so the distributions can test the RC when they start preparing for their own October releases. If this turns out to be a mistake after we try it out for Python 3.9 we can then discuss going back to longer betas and shorter RCs for the release after that. This will not change when feature development is cut off relative to PyCon US nor the core dev sprints happening just before the final release or the alpha of the next version. To help people who cannot upgrade on an annual cycle, do note that: * PEP 602 now says that deprecations will last two releases which is two years instead of the current 18 months * Now that the stable ABI has been cleaned, extension modules should feel more comfortable targeting the stable ABI which should make supporting newer versions of Python much easier As part of the shift to a 2 year deprecation time frame I will be restarting discussions around PEP 387 as BDFL-Delegate so we can have a more clear deprecation and backwards-compatibility policy as well for those that find an annual cycle too fast which will be updated to reflect this two year time frame (head's up, Benjamin 😉). Thanks to Łukasz, Nick, and Steve for PEPs 602, 605, and 607 and everyone else who provided feedback on those PEPs!

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EnHackathon 2019 - seeking core dev support
by Lewis Gaul Nov. 2, 2019

Nov. 2, 2019

Hi all, In early November this year I'll be leading the first ever Python 'EnHackathon' at the Ensoft Cisco office - we anticipate having ~10 first-time contributors, all with experience writing C and/or Python (and training in both). We each have up to 5 days (per year) to contribute, with my intention being to focus on contributing to CPython. We will be blogging about our experience (probably using GitHub pages) - I'll send out the URL when it's been set up. Having spoken to people about this at PyCon UK this year and emailed on the core-mentorship mailing list, I'm posting here looking for any core devs who would be happy to provide us with some guidance. I'm wary of PR reviews being a blocker, and not wanting my co-contributors to feel disheartened by issues they're working on not reaching a resolution. We're open to working on almost any area of CPython, although particular areas of interest/familiarity might be: CPython core, re, unittest, subprocess, asyncio, ctypes, typing. There would be scope for us to work in small teams to work on more substantial issues if that is seen as a useful way to contribute, otherwise we can start with some of the easier issues on bpo. Would anyone here be willing to offer some support to help us reach our full potential? Please don't hesitate to contact me if you're interested in any way, or if you have any advice. If this year is a success there's a high probability we would look to do a similar thing in future years (with the experience from this year already in the bag)! Thanks, Lewis

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[RELEASED] Python 3.5.9 is released
by Larry Hastings Nov. 2, 2019

Nov. 2, 2019

On behalf of the Python development community, I'm slightly chagrined to announce the availability of Python 3.5.9. There were no new changes in version 3.5.9; 3.5.9 was released only because of a CDN caching problem, which resulted in some users downloading a prerelease version of the 3.5.8 .xz source tarball. Apart from the version number, 3.5.9 is identical to the proper 3.5.8 release. This new version is a source-only release. You can find Python 3.5.9 here: https://www.python.org/downloads/release/python-359/ Happy Halloween, /arry

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