Mailman 3 April 2022 - Python-Dev

Need gh-13143 (bpo-34975: Add start_tls() method to streams API) to be merged
by Oleg Iarygin 11 Apr '22

11 Apr '22

Hi everyone, Can PR gh-13143 be reopened and reviewed/merged when possible? It was closed in favor of the new asyncio streams API (gh-13251). Later, the API was cleanly removed (gh-16482) so the proposed PR became relevant again. The added method allows to turn encryption on on demand (and off, as the author expressed his readiness). It's required for a CPython test suit, to port `test.test_ftplib.DummyFTPServer` from asyncore/asynchat before their removal according to PEP 594 (Removing dead batteries from the standard library). Thank you in advance.

2 1

GitHub Issues are now live
by Ezio Melotti 10 Apr '22

10 Apr '22

The migration from bugs.python.org to GitHub is now officially complete, and all the issues have been successfully transferred. You can read the full announcement here: https://discuss.python.org/t/github-issues-are-now-live/14967 Best Regards, Ezio Melotti

1 0

About PEPs being discussed on Discourse
by Victor Stinner 09 Apr '22

09 Apr '22

Hi, Would it be possible to announce new PEPs on python-dev please? I don't go often to Discourse, like once a month. I don't get any notification by email. I expected new PEPs to be announced on python-dev, but they are not announced here anymore. Is it possible to get Discourse notifications by email, but only for new PEPs? Using mailing lists, it's easy: just select the mailing list that you would like to subscribe to. So I went to Discourse, I click on "New Topics" and I don't see any new PEP... ... But if I go manually to the PEP category, there are 2 new PEPs proposed (PEP 678, PEP 687). In this category, if I click on the bell: it says "You will be notified if someone mentions your @name or replies to you". I can change this parameter to "You will be notified of new topics in this category but not replies to the topics." I don't recall if I changed this parameter manually, but it seems like the choice to only be notified of new topics is a new (i don't think that it existed 1 year ago). I don't recall that I opted in to not be notified of new PEPs. Now I see that Inada-san submitted the PEP 686 to the SC: https://github.com/python/steering-council/issues/118 I didn't read the discussion about this PEP which interest me. I knew that it exists because I saw related issues and pull requests about this PEP, but I didn't go to the discussion because I don't have the habit of visiting Discourse. I guess that it's my fault of not going to Discourse often enough. It's sometimes hard to keep track of everything happening around Python development. The discussions are scattered between multiple communication channels: * Issues * Pull requests * python-dev * python-committers * (private) Discord * Discourse * (public) IRC #python-dev Sometimes, I already confused by the same topic being discussed in two different Discord rooms :-) It's also common that some people discuss on the issue, and other people have a parallel discussion (about the same topic) on the related pull request. There are also Language Summit (sadly, I cannot attend it this year, for the first time) and CPython core dev sprints. Sometimes, a discussion happens on Twitter, but if it becomes serious, it moves to the above communication channels, so it's fine. I'm not going to https://python.zulipchat.com/ anymore, I guess that it has been replaced with Discord. Victor -- Night gathers, and now my watch begins. It shall not end until my death.

14 17

Summary of Python tracker Issues
by Python tracker 08 Apr '22

08 Apr '22

ACTIVITY SUMMARY (2022-04-01 - 2022-04-08) 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 7146 ( -7) closed 51841 (+78) total 58987 (+71) Open issues with patches: 2890 Issues opened (49) ================== #47104: Rewrite asyncio.to_thread tests to use IsolatedAsyncioTestCase https://bugs.python.org/issue47104 reopened by kj #47136: The variable __module__ in the class body getting an undesirab https://bugs.python.org/issue47136 reopened by ethan.furman #47191: inspect - getasyncgeneratorstate, getasyncgeneratorlocals https://bugs.python.org/issue47191 opened by animatea.programming #47192: sys._getframe audit event has frame as argument in 3.8-3.10 https://bugs.python.org/issue47192 opened by Dutcho #47193: Use zlib-ng rather than zlib in binary releases https://bugs.python.org/issue47193 opened by gregory.p.smith #47194: Upgrade to zlib v1.2.12 in CPython binary releases https://bugs.python.org/issue47194 opened by gregory.p.smith #47195: importlib lock race issue in deadlock handling code https://bugs.python.org/issue47195 opened by rpurdie #47197: ctypes mishandles `void` return type https://bugs.python.org/issue47197 opened by hoodchatham #47199: multiprocessing: micro-optimize Connection.send_bytes() method https://bugs.python.org/issue47199 opened by malin #47200: Add ZipInfo.mode property https://bugs.python.org/issue47200 opened by sam_ezeh #47201: pip3.10.4 is configured with locations that require TLS/SSL, h https://bugs.python.org/issue47201 opened by alessandro.pioli #47204: Ensure PyEval_GetGlobals() doesn't set an exception when retur https://bugs.python.org/issue47204 opened by ncoghlan #47205: posix.sched_{get|set}affinity(-1) no longer returns ProcessLoo https://bugs.python.org/issue47205 opened by christian.heimes #47206: pickle docs are wrong about nested classes https://bugs.python.org/issue47206 opened by JelleZijlstra #47207: Switch datetime docstrings / documentation to using "Returns" https://bugs.python.org/issue47207 opened by p-ganssle #47208: Support libffi implementations that cannot support invocations https://bugs.python.org/issue47208 opened by hoodchatham #47209: Documentation for asserting values of `unittest.mock.Mock.call https://bugs.python.org/issue47209 opened by himkt #47214: builtin_function_or_method is also either a function or a meth https://bugs.python.org/issue47214 opened by apostofes #47215: Add "unstable" frame stack api https://bugs.python.org/issue47215 opened by Mark.Shannon #47216: adding mtime option to gzip open() https://bugs.python.org/issue47216 opened by ellaellela #47217: adding name to BZ2File https://bugs.python.org/issue47217 opened by ellaellela #47218: adding name to lzmafile https://bugs.python.org/issue47218 opened by ellaellela #47219: asyncio with two interpreter instances https://bugs.python.org/issue47219 opened by mbadaire #47220: Document the optional callback parameter of weakref.WeakMethod https://bugs.python.org/issue47220 opened by maggyero #47222: subprocess.Popen() should allow capturing output and sending i https://bugs.python.org/issue47222 opened by pprindeville #47228: Document that naïve datetime objects represent local time https://bugs.python.org/issue47228 opened by p-ganssle #47231: TarFile.getmember cannot work on tar sourced directory over 10 https://bugs.python.org/issue47231 opened by cfernald #47233: show_caches option affects code positions reported by dis.get_ https://bugs.python.org/issue47233 opened by 15r10nk #47234: PEP-484 "numeric tower" approach makes it hard/impossible to s https://bugs.python.org/issue47234 opened by tfish2 #47236: Document types.CodeType.replace() changes about co_exceptionta https://bugs.python.org/issue47236 opened by vstinner #47237: Inheritance from base class with property in class makes them https://bugs.python.org/issue47237 opened by Germandrummer92 #47238: Python threading.Event().wait() depends on the system time https://bugs.python.org/issue47238 opened by AleksandrAQ #47240: Python 3.x built for ppc+ppc64 errs on: No module named 'msvcr https://bugs.python.org/issue47240 opened by barracuda156 #47241: [C API] Move the PyCodeObject structure to the internal C API https://bugs.python.org/issue47241 opened by vstinner #47242: Annoying white bar in IDLE (line 457 in sidebar.py) https://bugs.python.org/issue47242 opened by antudic #47243: Duplicate entry in 'Objects/unicodetype_db.h' https://bugs.python.org/issue47243 opened by LiarPrincess #47244: email.utils.formataddr does not respect double spaces https://bugs.python.org/issue47244 opened by AlecRosenbaum #47247: Default arguments for access 'mode' parameters in pathlib and https://bugs.python.org/issue47247 opened by AidanWoolley #47248: Possible slowdown of regex searching in 3.11 https://bugs.python.org/issue47248 opened by Mark.Shannon #47249: test_multiprocessing_fork probabilistic failure https://bugs.python.org/issue47249 opened by sxt1001 #47251: Merge BINARY_SUBSCR_LIST_INT with BINARY_SUBSCR_LIST_TUPLE https://bugs.python.org/issue47251 opened by pieter.eendebak #47252: socket.makefile documentation is missing data regarding the 'b https://bugs.python.org/issue47252 opened by alon.menczer #47253: LOAD_GLOBAL instruction with wrong source position https://bugs.python.org/issue47253 opened by 15r10nk #47254: enhanced dir? https://bugs.python.org/issue47254 opened by apostofes #47255: Many broken :meth: roles in the docs https://bugs.python.org/issue47255 opened by JelleZijlstra #47256: re: limit the maximum capturing group to 1,073,741,823, reduce https://bugs.python.org/issue47256 opened by malin #47258: Python 3.10 hang at exit in drop_gil() (due to resource warnin https://bugs.python.org/issue47258 opened by rpurdie #47259: Clarify SortingHOWTO regarding locale aware string sorting https://bugs.python.org/issue47259 opened by CendioOssman #47261: RFC: Clarify usage of macros for PySequence_Fast within the Li https://bugs.python.org/issue47261 opened by rgoswami Most recent 15 issues with no replies (15) ========================================== #47258: Python 3.10 hang at exit in drop_gil() (due to resource warnin https://bugs.python.org/issue47258 #47256: re: limit the maximum capturing group to 1,073,741,823, reduce https://bugs.python.org/issue47256 #47253: LOAD_GLOBAL instruction with wrong source position https://bugs.python.org/issue47253 #47252: socket.makefile documentation is missing data regarding the 'b https://bugs.python.org/issue47252 #47251: Merge BINARY_SUBSCR_LIST_INT with BINARY_SUBSCR_LIST_TUPLE https://bugs.python.org/issue47251 #47244: email.utils.formataddr does not respect double spaces https://bugs.python.org/issue47244 #47242: Annoying white bar in IDLE (line 457 in sidebar.py) https://bugs.python.org/issue47242 #47241: [C API] Move the PyCodeObject structure to the internal C API https://bugs.python.org/issue47241 #47238: Python threading.Event().wait() depends on the system time https://bugs.python.org/issue47238 #47236: Document types.CodeType.replace() changes about co_exceptionta https://bugs.python.org/issue47236 #47228: Document that naïve datetime objects represent local time https://bugs.python.org/issue47228 #47222: subprocess.Popen() should allow capturing output and sending i https://bugs.python.org/issue47222 #47219: asyncio with two interpreter instances https://bugs.python.org/issue47219 #47218: adding name to lzmafile https://bugs.python.org/issue47218 #47217: adding name to BZ2File https://bugs.python.org/issue47217 Most recent 15 issues waiting for review (15) ============================================= #47256: re: limit the maximum capturing group to 1,073,741,823, reduce https://bugs.python.org/issue47256 #47255: Many broken :meth: roles in the docs https://bugs.python.org/issue47255 #47254: enhanced dir? https://bugs.python.org/issue47254 #47251: Merge BINARY_SUBSCR_LIST_INT with BINARY_SUBSCR_LIST_TUPLE https://bugs.python.org/issue47251 #47243: Duplicate entry in 'Objects/unicodetype_db.h' https://bugs.python.org/issue47243 #47233: show_caches option affects code positions reported by dis.get_ https://bugs.python.org/issue47233 #47222: subprocess.Popen() should allow capturing output and sending i https://bugs.python.org/issue47222 #47218: adding name to lzmafile https://bugs.python.org/issue47218 #47217: adding name to BZ2File https://bugs.python.org/issue47217 #47216: adding mtime option to gzip open() https://bugs.python.org/issue47216 #47215: Add "unstable" frame stack api https://bugs.python.org/issue47215 #47208: Support libffi implementations that cannot support invocations https://bugs.python.org/issue47208 #47205: posix.sched_{get|set}affinity(-1) no longer returns ProcessLoo https://bugs.python.org/issue47205 #47200: Add ZipInfo.mode property https://bugs.python.org/issue47200 #47199: multiprocessing: micro-optimize Connection.send_bytes() method https://bugs.python.org/issue47199 Top 10 most discussed issues (10) ================================= #47152: Reorganize the re module sources https://bugs.python.org/issue47152 19 msgs #40280: Consider supporting emscripten/webassembly as a build target https://bugs.python.org/issue40280 10 msgs #45847: Port module setup to PY_STDLIB_MOD() macro and addext() https://bugs.python.org/issue45847 10 msgs #47205: posix.sched_{get|set}affinity(-1) no longer returns ProcessLoo https://bugs.python.org/issue47205 8 msgs #47136: The variable __module__ in the class body getting an undesirab https://bugs.python.org/issue47136 7 msgs #47234: PEP-484 "numeric tower" approach makes it hard/impossible to s https://bugs.python.org/issue47234 5 msgs #32658: Metacharacter (\) documentation suggestion https://bugs.python.org/issue32658 4 msgs #39064: ValueError in zipfile.ZipFile https://bugs.python.org/issue39064 4 msgs #42238: Deprecate suspicious.py? https://bugs.python.org/issue42238 4 msgs #47006: PEP 646: Decide on substitution behavior https://bugs.python.org/issue47006 4 msgs Issues closed (75) ================== #5901: missing meta-info in documentation pdf https://bugs.python.org/issue5901 closed by ned.deily #21956: Doc files deleted from repo are not deleted from docs.python.o https://bugs.python.org/issue21956 closed by mdk #22738: improve 'python -h' documentation for '-c' https://bugs.python.org/issue22738 closed by iritkatriel #23312: google thinks the docs are mobile unfriendly https://bugs.python.org/issue23312 closed by petr.viktorin #23689: Memory leak in Modules/sre_lib.h https://bugs.python.org/issue23689 closed by serhiy.storchaka #24563: [doc] Encoding declaration: doc supported encodings https://bugs.python.org/issue24563 closed by terry.reedy #26579: Support pickling slots in subclasses of common classes https://bugs.python.org/issue26579 closed by serhiy.storchaka #27376: Add mock_import method to mock module https://bugs.python.org/issue27376 closed by iritkatriel #28540: math.degrees(sys.float_info.max) should throw an OverflowError https://bugs.python.org/issue28540 closed by rhettinger #29920: Document cgitb.text and cgitb.html https://bugs.python.org/issue29920 closed by iritkatriel #36795: "make venv" failed in Docs https://bugs.python.org/issue36795 closed by hugovk #37387: test_compileall fails randomly on Windows when tests are run i https://bugs.python.org/issue37387 closed by vstinner #38299: build errors - latest "git pull" https://bugs.python.org/issue38299 closed by iritkatriel #40421: [C API] Add public getter functions for the internal PyFrameOb https://bugs.python.org/issue40421 closed by vstinner #40982: copytree example in shutil https://bugs.python.org/issue40982 closed by JelleZijlstra #41233: Missing links to errnos on Built-in Exceptions page https://bugs.python.org/issue41233 closed by JelleZijlstra #41930: Wrap sqlite3_serialize API in sqlite3 module https://bugs.python.org/issue41930 closed by JelleZijlstra #43464: set intersections should short-circuit https://bugs.python.org/issue43464 closed by serhiy.storchaka #43528: "connect_read_pipe" raises errors on Windows for STDIN https://bugs.python.org/issue43528 closed by kumaraditya #44213: LIST_TO_TUPLE placed below the sentence "all of the following https://bugs.python.org/issue44213 closed by iritkatriel #44501: Packing constant call arguments https://bugs.python.org/issue44501 closed by BTaskaya #45114: bad example for os.stat https://bugs.python.org/issue45114 closed by JelleZijlstra #45410: python -m test -jN: write stderr in stdout to get messages in https://bugs.python.org/issue45410 closed by vstinner #45584: Clarifying truncating in documentation https://bugs.python.org/issue45584 closed by JelleZijlstra #45790: Inaccurate phrasing in extending/newtypes_tutorial https://bugs.python.org/issue45790 closed by JelleZijlstra #46023: Modules/makesetup generated rules ignore *disabled* https://bugs.python.org/issue46023 closed by christian.heimes #46033: Duplicated sentence in for statement documentation https://bugs.python.org/issue46033 closed by terry.reedy #46484: Add test for Calendar().iterweekdays() https://bugs.python.org/issue46484 closed by iritkatriel #46607: Add DeprecationWarning to configparser's LegacyInterpolation https://bugs.python.org/issue46607 closed by vstinner #46721: Optimize set.issuperset() for non-set argument https://bugs.python.org/issue46721 closed by serhiy.storchaka #46850: [C API] Move _PyEval_EvalFrameDefault() to the internal C API https://bugs.python.org/issue46850 closed by vstinner #46998: Allow subclassing Any at runtime https://bugs.python.org/issue46998 closed by JelleZijlstra #47007: [doc] str docs are inconsistent with special method lookup https://bugs.python.org/issue47007 closed by JelleZijlstra #47009: Streamline list.append for the common case https://bugs.python.org/issue47009 closed by Dennis Sweeney #47022: PEP 594: Document removal of asynchat, asyncore and smtpd https://bugs.python.org/issue47022 closed by brett.cannon #47031: math.nan should note that NANs do not compare equal to anythin https://bugs.python.org/issue47031 closed by JelleZijlstra #47050: Cannot install Python 3.10.3 on Windows https://bugs.python.org/issue47050 closed by AlexWaygood #47088: Implement PEP 675 (LiteralString) https://bugs.python.org/issue47088 closed by JelleZijlstra #47089: Avoid sporadic failure of test_compileall on Windows https://bugs.python.org/issue47089 closed by vstinner #47097: Document PEP 646 https://bugs.python.org/issue47097 closed by AlexWaygood #47103: Copy pgort140.dll when building for PGO https://bugs.python.org/issue47103 closed by steve.dower #47131: Speedup test_unparse https://bugs.python.org/issue47131 closed by jkloth #47147: Allow `return yield from` https://bugs.python.org/issue47147 closed by pablogsal #47176: Interrupt handling for wasm32-emscripten builds without pthrea https://bugs.python.org/issue47176 closed by christian.heimes #47177: Frames should store next_instr instead of lasti https://bugs.python.org/issue47177 closed by brandtbucher #47185: code.replace(co_code=new_code) no longer catch exceptions on P https://bugs.python.org/issue47185 closed by gvanrossum #47186: split JUMP_IF_NOT_EXC/EG_MATCH into CHECK_EXC/EG_MATCH + jump https://bugs.python.org/issue47186 closed by iritkatriel #47188: ncurses: *** buffer overflow detected ***: terminated with -D_ https://bugs.python.org/issue47188 closed by Martin Liška #47189: What's new in Python 3.11: Faster CPython https://bugs.python.org/issue47189 closed by kj #47190: Integrating tkinter and asyncio event loops https://bugs.python.org/issue47190 closed by skip.montanaro #47196: Function pointer cast in test_imp https://bugs.python.org/issue47196 closed by christian.heimes #47198: os.stat on windows doesn't take an open file even though os.st https://bugs.python.org/issue47198 closed by eryksun #47202: Feature request: Throw an error when making impossible evaluat https://bugs.python.org/issue47202 closed by JelleZijlstra #47203: ImportError: DLL load failed while importing binascii: %1 is n https://bugs.python.org/issue47203 closed by MatthewJ #47210: './configure --help' causes infinite loop https://bugs.python.org/issue47210 closed by ripspin5 #47211: Remove re.template() and re.TEMPLATE https://bugs.python.org/issue47211 closed by serhiy.storchaka #47212: Minor issues in reported Syntax errors https://bugs.python.org/issue47212 closed by AlexWaygood #47213: Incorrect location of caret in SyntaxError https://bugs.python.org/issue47213 closed by pablogsal #47221: chained comparisons slower than using `and` https://bugs.python.org/issue47221 closed by Dennis Sweeney #47223: (closed mistakingly, see the next issue) The variable __module https://bugs.python.org/issue47223 closed by Takuo Matsuoka #47224: The variable __module__ in the class body getting an undesirab https://bugs.python.org/issue47224 closed by ethan.furman #47225: Issue in subtraction of float numbers https://bugs.python.org/issue47225 closed by rhettinger #47226: Unexpected indent message https://bugs.python.org/issue47226 closed by vkaushalsai #47227: Suppress expression chaining for RE parsing errors https://bugs.python.org/issue47227 closed by serhiy.storchaka #47229: IDLE UI crashes on Chromebook Linux/Bullseye https://bugs.python.org/issue47229 closed by terry.reedy #47230: New compiler warnings with latest zlib https://bugs.python.org/issue47230 closed by jkloth #47232: Difficulties building tip of tree Python for emscripten https://bugs.python.org/issue47232 closed by hoodchatham #47235: Clarify that `assret_called_once_with` sample code is intended https://bugs.python.org/issue47235 closed by gregory.p.smith #47239: Python Launcher for Windows (`py -0`) no longer shows star ("* https://bugs.python.org/issue47239 closed by steve.dower #47245: potential undefined behavior with subprocess using vfork() on https://bugs.python.org/issue47245 closed by socketpair #47246: Race condition in `threadig.Thread._wait_for_tstate_lock` https://bugs.python.org/issue47246 closed by dmaurer #47250: New object.__getstate__() method introduced refleaks https://bugs.python.org/issue47250 closed by corona10 #47257: add methods to get first and last elements of a range https://bugs.python.org/issue47257 closed by phr #47260: os.closerange() can be no-op in a seccomp sandbox https://bugs.python.org/issue47260 closed by gregory.p.smith #968063: Add fileinput.islastline() https://bugs.python.org/issue968063 closed by iritkatriel

1 0

The GitHub Issues Migration begins today
by Ezio Melotti 08 Apr '22

08 Apr '22

In about 1 hour from now, bugs.python.org will become read-only, and the migration to GitHub Issues will begin. Throughout the migration it will not be possible to report new issues or comment on existing ones. Once all the issues have been migrated from bpo to GitHub, you will be able to comment using GitHub Issues. bpo will remain available in read-only mode. For live updates, see https://discuss.python.org/t/github-issues-migration-status-update/14573 Best Regards, Ezio Melotti

1 0

Heads-up: Converting Misc/stable_abi.txt to TOML
by Petr Viktorin 08 Apr '22

08 Apr '22

Hello, Now that tomllib is in the stdlib, I'd like to convert the stable ABI manifest (Misc/stable_abi.txt) to TOML to make it easier to work with. To get proper highlighting in editors, I'd like to rename it from .txt to .toml. So, when the command that uses it stops working for you, change `.txt` to `.toml`. (See https://devguide.python.org/c-api/#adding-a-new-definition-to-the-limited-a… -- if you're using make, nothing should change for you.) As always, the file is only intended as input to the stable_abi script. The format/contents can change unexpectedly. If you use it for something else, let me know and let's create a proper data source for your use case. bpo link: https://bugs.python.org/issue47168

1 0

[IMPORTANT] Preparations for 3.11.0 beta 1
by Pablo Galindo Salgado 08 Apr '22

08 Apr '22

Hi everyone, We have approximately one month until feature freeze and for 3.11.0b1 to be released. I wanted to take this time to share some planning and considerations with you. Please, read carefully these points as they are important. * 3.11.0b1 is scheduled for Friday, 2022-05-06, which is after the PyCon US sprints. As the sprints normally end with a considerable amount of PRs getting merged and the buildbots having a hard time, I may need to move the release before or after to accommodate for this and to prevent the release from going haywire. I will share updates with you as they become available. * The latest alpha releases have been quite challenging. We had a considerable number of release blockers and issues that were raised just a couple of days before the release. Please, check the release blockers on bpo/Github as much as you can and make sure these are resolved before the release date. Any release blockers for 3.11 will block feature freeze. If this happens, the main branch will be blocked and only PRs fixing the blockers will be allowed in that time. * Important!! Please, if you are planning to commit a big chunk of code/ a new big refactor/ a new big feature/ a PEP implementation within this month, please let me know (an email works) so we can be on top of things in the release team and so I can keep an eye on regressions. * Any regression at the time of beta freeze will potentially result in the release team being forced to revert commits and PRs. This means that if we need to revert a new feature or similar it may be delayed to 3.12, so be sure to not commit unstable code as much as is humanly possible. Please, reach out to me if you have any questions, comments or if you want to discuss anything. I want to thank you all for your understanding and collaboration :) Kind regards from rainy London, Your friendly release team

3 4

PEP 686 – Make UTF-8 mode default
by Inada Naoki 08 Apr '22

08 Apr '22

Hi, all. I wrote a new PEP last month. I'm sorry that I forgot to announce it here. The pep is here: https://peps.python.org/pep-0686/ Discussions: * https://discuss.python.org/t/14737 (current thread) * https://discuss.python.org/t/14435 (previous thread) -- Inada Naoki <songofacandy(a)gmail.com>

1 0

[RELEASE] The last Python 3.11 alpha (3.11.0a7) is available - Prepare for beta freeze
by Pablo Galindo Salgado 06 Apr '22

06 Apr '22

Brrrrr..... do you feel that? That's the chill of *beta freeze* coming closer. Meanwhile, your friendly CPython release team doesn’t rest and we have prepared a shiny new release for you: Python 3.11.0a7. ************************************************************************************************************************************************************ Dear fellow core developer: This alpha is the last release before feature freeze (Friday, 2022-05-06), so make sure that all new features and PEPs are landed in the master branch before we release the first beta. Please, be specially mindfully to check the CI and the buildbots, maybe even using the test-with-buildbots label in GitHub before merging so the release team don’t need to fix a bunch of reference leaks or platform-specific problems on the first beta release. ************************************************************************************************************************************************************ *Go get the new alpha here:* https://www.python.org/downloads/release/python-3110a7/ **This is an early developer preview of Python 3.11** # Major new features of the 3.11 series, compared to 3.10 Python 3.11 is still in development. This release, 3.11.0a7 is the last of seven planned alpha releases. Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process. During the alpha phase, features may be added up until the start of the beta phase (2022-05-06) and, if necessary, may be modified or deleted up until the release candidate phase (2022-08-01). Please keep in mind that this is a preview release and its use is **not** recommended for production environments. Many new features for Python 3.11 are still being planned and written. Among the new major new features and changes so far: * [PEP 657](https://www.python.org/dev/peps/pep-0657/) -- Include Fine-Grained Error Locations in Tracebacks * [PEP 654](https://www.python.org/dev/peps/pep-0654/) -- Exception Groups and except* * [PEP 673](https://www.python.org/dev/peps/pep-0673/) -- Self Type * [PEP 646](https://www.python.org/dev/peps/pep-0646/)-- Variadic Generics * [PEP 680](https://www.python.org/dev/peps/pep-0680/)-- tomllib: Support for Parsing TOML in the Standard Library * [PEP 675](https://www.python.org/dev/peps/pep-0675/)-- Arbitrary Literal String Type * [PEP 655](https://www.python.org/dev/peps/pep-0655/)-- Marking individual TypedDict items as required or potentially-missing * [bpo-46752](https://bugs.python.org/issue46752)-- Introduce task groups to asyncio * The [Faster Cpython Project](https://github.com/faster-cpython) is already yielding some exciting results: this version of CPython 3.11 is ~12% faster on the geometric mean of the [PyPerformance benchmarks]( speed.python.org), compared to 3.10.0. * Hey, **fellow core developer,** if a feature you find important is missing from this list, let me know. The next pre-release of Python 3.11 will be 3.11.0b1, currently scheduled for Friday, 2022-05-06. # More resources * [Online Documentation](https://docs.python.org/3.11/) * [PEP 664](https://www.python.org/dev/peps/pep-0664/), 3.11 Release Schedule * Report bugs at [https://bugs.python.org](https://bugs.python.org). * [Help fund Python and its community](/psf/donations/). # And now for something completely different In mathematics, the Dirac delta distribution (δ distribution) is a generalized function or distribution over the real numbers, whose value is zero everywhere except at zero, and whose integral over the entire real line is equal to one. The current understanding of the impulse is as a linear functional that maps every continuous function to its value at zero. The delta function was introduced by physicist Paul Dirac as a tool for the normalization of state vectors. It also has uses in probability theory and signal processing. Its validity was disputed until Laurent Schwartz developed the theory of distributions where it is defined as a linear form acting on functions. Defining this distribution as a "function" as many physicist do is known to be one of the easier ways to annoy mathematicians :) # We hope you enjoy those new releases! Thanks to all of the many volunteers who help make Python Development and these releases possible! Please consider supporting our efforts by volunteering yourself or through organization contributions to the Python Software Foundation. Your friendly release team, Pablo Galindo @pablogsal Ned Deily @nad Steve Dower @steve.dower

3 6

Descriptions in unittest and avoiding confusion
by Jason R. Coombs 06 Apr '22

06 Apr '22

For the edification of all involved, this post summarizes a somewhat surprising behavior in unittest around docstrings. In bpo-46126<https://bugs.python.org/issue46126>, I reported an issue where I’d observed that CPython developers were avoiding the use of docstrings in unittests due to what was perceived as a masking of crucial information. On further investigation, it turns out that with the “descriptions” setting of the TextTestRunner is set to True (the default), unittest will emit the first line of a test’s docstring (if present) in addition to the location of the test. As a result, for tests that have docstrings, the output varies depending on this setting. Verbose output with docstrings and descriptions enabled: test_entry_points_unique_packages (test.test_importlib.test_metadata_api.APITests) Entry points should only be exposed for the first package ... ERROR Without docstrings or with descriptions disabled: test_entry_points_unique_packages (test.test_importlib.test_metadata_api.APITests) ... ERROR The output with the docstrings is more descriptive, providing more context and detail about the intention of the failed test. Because of the additional detail, however, unittest has elected to use a newline between the test location and the description, meaning the test result no longer appears on the same line as the test location, and thus if one were to grep for the test name, the result would be omitted, and if one were to grep for ERROR, the test name would be omitted. As part of the investigation, I published In Python, use docstrings or comments?<https://blog.jaraco.com/why-docstrings-are-preferable-to-comments/> exploring the motivations for and value added by allowing docstrings in test functions. It’s still an open consideration<https://bugs.python.org/issue47133> whether the unittest UX should format descriptions in the output differently to provide more consistent output while still allowing docstrings. Based on this information, CPython will most likely (pending GH-32128<https://github.com/python/cpython/pull/32128>) continue to use the default behavior (descriptions enabled) but will also allow for docstrings in its own tests.

9 11