Mailman 3 April 2021 - Python-Dev

Request for comments on final version of PEP 653 (Precise Semantics for Pattern Matching)
by Mark Shannon April 7, 2021

April 7, 2021

Hi everyone, As the 3.10 beta is not so far away, I've cut down PEP 653 down to the minimum needed for 3.10. The extensions will have to wait for 3.11. The essence of the PEP is now that: 1. The semantics of pattern matching, although basically unchanged, are more precisely defined. 2. The __match_kind__ special attribute will be used to determine which patterns to match, rather than relying on the collections.abc module. Everything else has been removed or deferred. The PEP now has only the slightest changes to semantics, which should be undetectable in normal use. For those corner cases where there is a difference, it is to make pattern matching more robust. E.g. With PEP 653, pattern matching will work in the collections.abc module. With PEP 634 it does not. As always, all thoughts and comments are welcome. Cheers, Mark.

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Call for attention: pip’s migration path from distutils to sysconfig is narrowing
by Tzu-ping Chung April 7, 2021

April 7, 2021

Cross-posted from https://discuss.python.org/t/8111 on Brett’s suggestion. A while ago, I proposed pip’s migration plan from distutils to sysconfig[1], in preparation of distuitls’s deprecation and planned removal in Python 3.12. When working on the implementation, however, I realised sysconfig currently lacks important abstractions that pip needs to correctly interface with downstream Python redistributors and alternative Python implementations. I raised the issue in b.p.o.43312[2] and provided a pull request[3], but failed to progress things forward. With only one alpha window left[4], time is running out for the change to make it into 3.10. If this has to wait for 3.11, pip will be left with only one year to perform the migration away from distutils and detect possible backward incompatibilities, which, since Python packaging tends to have a very long tail of users on older Python versions, would make the distutils removal extremely disruptive. I wish this does not sound like I’m pressuring people to accept my patch; that is not my intention at all. I do, however, very strongly feel pip’s inability to remove distutils dependence is not taken seriously enough, and will be very problematic if the status quo continues. Either something is done for sysconfig in Python 3.10, or distutils’s removal must be delayed indefinitely until pip is able to replace its distutils usages with stdlib replacements. Otherwise, 3.12 users will not be able to use pip. [1]: https://github.com/pypa/pip/issues/9617 [2]: https://bugs.python.org/issue43312 [3]: https://github.com/python/cpython/pull/24644 [4]: https://discuss.python.org/t/8107 -- Tzu-ping Chung (@uranusjr) uranusjr(a)gmail.com https://uranusjr.com

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NOTE: Python 3.9.3 contains an unintentional ABI incompatibility leading to crashes on 32-bit systems
by Łukasz Langa April 6, 2021

April 6, 2021

The memory layout of PyThreadState was unintentionally changed in the recent 3.9.3 bugfix release. This leads to crashes on 32-bit systems when importing binary extensions compiled for Python 3.9.0 - 3.9.2. This is a regression. We will be releasing a hotfix 3.9.4 around 24 hours from now to address this issue and restore ABI compatibility with C extensions built for Python 3.9.0 - 3.9.2. Details: https://bugs.python.org/issue43710 - Ł

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PEP 652 Accepted -- Maintaining the Stable ABI
by Pablo Galindo Salgado April 6, 2021

April 6, 2021

Hi Petr, Thank you for submitting PEP 652 (Maintaining the Stable ABI). After evaluating the situation and discussing the PEP, the Steering Council is happy with the PEP and hereby accepts it. The Steering council thinks that this is a great step forward in order to have a clear definition of what goes into the Stable ABI and what guarantees the Python core team offers regarding the stable ABI while offering at the same time a plan to improve the maintenance and stability of the stable ABI. We would also like to see some improvements in the official documentation (not only on the devguide) regarding this topic and what guarantees do we offer (currently we only have a small section about this in https://docs.python.org/3/c-api/stable.html but there is a lot of information and clarifications in the PEP that we would like to be also in the documentation). Congratulations, Petr! With thanks from the whole Python Steering Council, Pablo Galindo Salgado

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[RELEASE] The last Python 3.10 alpha (3.10.0a7) is available - Prepare for beta freeze
by Pablo Galindo Salgado April 6, 2021

April 6, 2021

Brrrrr..... do you feel that? That's the chill of *beta freeze* coming closer. Meanwhile, your friendly CPython release team doesn’t rest even on holidays and we have prepared a shiny new release for you: Python 3.10.0a7. **************************************************** Dear fellow core developer: This alpha is the last release before feature freeze (2021-05-03), 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-3100a7/ *Python 3.10.0a7*Release Date: April 5, 2021 This is an early developer preview of Python 3.10 *Major new features of the 3.10 series, compared to 3.9* Python 3.10 is still in development. This release, 3.10.0a7 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 (2021-05-03) and, if necessary, may be modified or deleted up until the release candidate phase (2021-10-04). Please keep in mind that this is a preview release and its use is not recommended for production environments. Many new features for Python 3.10 are still being planned and written. Among the new major new features and changes so far: PEP 623 – Deprecate and prepare for the removal of the wstr member in PyUnicodeObject. PEP 604 – Allow writing union types as X | Y PEP 612 – Parameter Specification Variables PEP 626 – Precise line numbers for debugging and other tools. bpo-38605: from __future__ import annotations (PEP 563) is now the default. PEP 618 – Add Optional Length-Checking To zip. bpo-12782: Parenthesized context managers are now officially allowed. PEP 632 – Deprecate distutils module. PEP 613 – Explicit Type Aliases PEP 634 – Structural Pattern Matching: Specification PEP 635 – Structural Pattern Matching: Motivation and Rationale PEP 636 – Structural Pattern Matching: Tutorial PEP 644 – Require OpenSSL 1.1.1 or newer PEP 624 – Remove Py_UNICODE encoder APIs PEP 597 – Add optional EncodingWarning (Hey, fellow core developer, if a feature you find important is missing from this list, let Pablo know.) The next pre-release of Python 3.10 will be 3.10.0b1 ( the first beta release and feature freeze ), currently scheduled for Monday, 2021-05-03. *And now for something completely different* In physics, the twin paradox is a thought experiment in special relativity involving identical twins, one of whom makes a journey into space in a high-speed rocket and returns home to find that the twin who remained on Earth has aged more. This result appears puzzling because each twin sees the other twin as moving, and so, as a consequence of an incorrect and naive application of time dilation and the principle of relativity, each should paradoxically find the other to have aged less. However, this scenario can be resolved by realising that the travelling twin is undergoing acceleration, which makes him a non-inertial observer. In both views, there is no symmetry between the spacetime paths of the twins. Therefore, the twin paradox is not a paradox in the sense of a logical contradiction. Your friendly release team, Pablo Galindo Salgado @pablogsal Ned Deily @nad Steve Dower @steve.dower

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Mailman 2 - not receiving moderators emails
by david＠theNicols.net April 6, 2021

April 6, 2021

I recently rebuilt my server (Ubuntu 20.04) and rebuilt mailman 2 - upgrading to the latest version 2.1.34. The mail server is postfix I run three mailing lists, including "TESTmail". The same issue below affects all three lists. On the General Page, I have filled in an administrator and a owner. The list options are set up that emails from non-members are held and the moderator should be notified. * The poster of the email receives a notification that the email is being held * The moderator does not receive any messages * But looking at the postfix logs, it appears to me that mailman does try to send a message to the moderator Apr 5 22:12:05 ip-xxx-xxx-xxx-xxx postfix/smtp[9473]: 6D0973EB91: to=<testmail-owner(a)lists.xxx.org.uk>, But, the email message is being sent to the generic owner, rather than the specific names filled into either the moderator or administrator boxes on the general tab. Also, I note that the footer of the mailing list has: TESTmail list run by testmail-owner at lists.XXX.org.uk rather than the specific owner. Any clues as to what is not quite correct in the mailman setup?

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[RELEASE] Python 3.9.4 hotfix is now available
by Łukasz Langa April 4, 2021

April 4, 2021

Python 3.9.3 was released two days ago on Friday, April 2nd. It contains important security content listed below for reference. Unfortunately, it also introduced an unintentional ABI incompatibility, making some C extensions built with Python 3.9.0 - 3.9.2 crash with Python 3.9.3 on 32-bit systems. To minimize disruption, I decided to recall 3.9.3 and introduce this hotfix release: 3.9.4. We highly recommend upgrading your Python 3.9 installations to 3.9.4 at your earliest convenience. Get it here: https://www.python.org/downloads/release/python-394/ <https://www.python.org/downloads/release/python-394/> What is “ABI compatibility”? Python guarantees that within a given language series (like the current 3.9) binary extensions written in C or C++ and compiled against headers of one release (like 3.9.0) will be importable from other versions in the same series (like 3.9.3). If this weren’t the case, library authors would have to ship separate binary wheels on PyPI for every single bugfix release of Python. That would be very inconvenient. <https://discuss.python.org/t/python-3-9-4-hotfix-is-now-available/8056#what…>What broke in Python 3.9.3? In a fix for a corner-case crash around recursion limits and exceptions, the PyThreadState struct needed to change. While PyThreadState’s only documented public member is the *interp field <https://docs.python.org/3.9/c-api/init.html#c.PyThreadState>, it’s not uncommon for C extensions to access other fields in this struct as well. When I approved the backport of this fix, I missed the fact that the variable size change would change the memory layout of said struct on 32-bit systems (on 64-bit systems alignment rules made the size change backwards compatible). Merging the backport was a mistake, and so 3.9.4 reverts it to restore compatibility with binary extensions built against Python 3.9.0 - 3.9.2. Details in bpo-43710 <https://bugs.python.org/issue43710>. <https://discuss.python.org/t/python-3-9-4-hotfix-is-now-available/8056#secu…>Security Content in Python 3.9.3 bpo-43631 <https://bugs.python.org/issue43631>: high-severity CVE-2021-3449 and CVE-2021-3450 were published for OpenSSL, it’s been upgraded to 1.1.1k in CI, and macOS and Windows installers. bpo-42988 <https://bugs.python.org/issue42988>: CVE-2021-3426: Remove the getfile feature of the pydoc module which could be abused to read arbitrary files on the disk (directory traversal vulnerability). Moreover, even source code of Python modules can contain sensitive data like passwords. Vulnerability reported by David Schwörer. bpo-43285 <https://bugs.python.org/issue43285>: ftplib no longer trusts the IP address value returned from the server in response to the PASV command by default. This prevents a malicious FTP server from using the response to probe IPv4 address and port combinations on the client network. Code that requires the former vulnerable behavior may set a trust_server_pasv_ipv4_address attribute on their ftplib.FTP instances to True to re-enable it. bpo-43439 <https://bugs.python.org/issue43439>: Add audit hooks for gc.get_objects(), gc.get_referrers() and gc.get_referents(). Patch by Pablo Galindo. <https://discuss.python.org/t/python-3-9-4-hotfix-is-now-available/8056#rele…>Release Calendar Maintenance releases for the 3.9 series will continue at regular bi-monthly intervals, with 3.9.5 planned for May 3rd 2021 as well. <https://discuss.python.org/t/python-3-9-4-hotfix-is-now-available/8056#what…>What’s new? The Python 3.9 series contains many new features and optimizations over 3.8. See the “What’s New in Python 3.9 <https://docs.python.org/3.9/whatsnew/3.9.html>” document for more information about features included in the 3.9 series. We also have a detailed change log for 3.9.3 <https://docs.python.org/release/3.9.3/whatsnew/changelog.html> specifically. Detailed information about all changes made in version 3.8.9 can be found in its respective changelog <https://docs.python.org/release/3.8.9/whatsnew/changelog.html>. <https://discuss.python.org/t/python-3-9-4-hotfix-is-now-available/8056#we-h…>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, Łukasz Langa @ambv <https://discuss.python.org/u/ambv> Ned Deily @nad <https://discuss.python.org/u/nad> Steve Dower @steve.dower <https://discuss.python.org/u/steve.dower>

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Summary of Python tracker Issues
by Python tracker April 2, 2021

April 2, 2021

ACTIVITY SUMMARY (2021-03-26 - 2021-04-02) Python tracker at https://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 7505 ( +7) closed 47938 (+67) total 55443 (+74) Open issues with patches: 2984 Issues opened (53) ================== #37368: test_asyncio: test_create_server_ssl_match_failed() failed on https://bugs.python.org/issue37368 reopened by nascheme #43510: PEP 597: Implemente encoding="locale" option and EncodingWarni https://bugs.python.org/issue43510 reopened by methane #43634: Extensions build does not respect --jobs setting https://bugs.python.org/issue43634 opened by JustAnotherArchivist #43635: Documentation needs to declare CalledProcessError as potential https://bugs.python.org/issue43635 opened by jennievh #43636: test_descr fails randomly when executed with -R : https://bugs.python.org/issue43636 opened by pablogsal #43638: MacOS os.statvfs() has rollover for >4TB disks at each 4TB (32 https://bugs.python.org/issue43638 opened by sanderjo #43639: Do not raise AttributeError on instance attribute update/delet https://bugs.python.org/issue43639 opened by maggyero #43640: Add warnings to ssl.PROTOCOL_TLSv1 and ssl.PROTOCOL_TLSv1_1 do https://bugs.python.org/issue43640 opened by illia-v #43641: Update `ssl.PROTOCOL_TLSv1_2` docs since it is not the newest https://bugs.python.org/issue43641 opened by illia-v #43642: ctypes.util.find_library can't find the lib on Alpine https://bugs.python.org/issue43642 opened by An1c0de #43643: importlib.readers.MultiplexedPath.name is not a property https://bugs.python.org/issue43643 opened by ap-- #43646: ForwardRef name conflict during evaluation https://bugs.python.org/issue43646 opened by tefra #43649: time.strftime('%z') doesn't return UTC offset in the form ��HH https://bugs.python.org/issue43649 opened by ede123 #43650: MemoryError on zip.read in shutil._unpack_zipfile https://bugs.python.org/issue43650 opened by igorvoltaic #43651: PEP 597: Fix EncodingWarning warnings in the Python stdlib https://bugs.python.org/issue43651 opened by methane #43652: Upgrade Windows tcl/tk to 8.6.11 https://bugs.python.org/issue43652 opened by terry.reedy #43654: IDLE: Applying settings disables tab completion https://bugs.python.org/issue43654 opened by terry.reedy #43655: Tkinter: Not setting _NET_WM_WINDOW_TYPE on FileDialog https://bugs.python.org/issue43655 opened by patrickmelix #43656: StackSummary.format fails if str(value) fails https://bugs.python.org/issue43656 opened by moi90 #43658: implementations of the deprecated load_module import loader AP https://bugs.python.org/issue43658 opened by kale-smoothie #43659: AIX: test_curses crashes buildbot https://bugs.python.org/issue43659 opened by Michael.Felt #43661: api-ms-win-core-path-l1-1.0.dll, redux of 40740 (which has sin https://bugs.python.org/issue43661 opened by tkacvinsky #43663: Python interpreter works abnormally after interrupting logging https://bugs.python.org/issue43663 opened by xxm #43664: Long computations in pdb.run() lead to segfault https://bugs.python.org/issue43664 opened by xxm #43666: AIX: Lib/_aix_support.py may break in a WPAR environment https://bugs.python.org/issue43666 opened by Michael.Felt #43667: Solaris: Fix broken Unicode encoding in non-UTF locales https://bugs.python.org/issue43667 opened by kulikjak #43668: Segfault with for fresh ubuntu 20.04 install https://bugs.python.org/issue43668 opened by axel_1234 #43669: PEP 644: Require OpenSSL 1.1.1 or newer https://bugs.python.org/issue43669 opened by christian.heimes #43671: segfault when using tkinter + pygame for ~5 minutes https://bugs.python.org/issue43671 opened by Pycryptor10 #43672: Raise ImportWarning when calling find_loader() https://bugs.python.org/issue43672 opened by brett.cannon #43676: Doctest ELLIPSIS explanation hard to follow when they're missi https://bugs.python.org/issue43676 opened by Tim.Hatch #43678: TypeError: get() got an unexpected keyword argument 'vars' https://bugs.python.org/issue43678 opened by cis-muzahid #43679: ttk.Sizegrip disappears under Windows 10 UI Scaling, with dpiA https://bugs.python.org/issue43679 opened by msmith #43680: Remove undocumented io.OpenWrapper and _pyio.OpenWrapper https://bugs.python.org/issue43680 opened by vstinner #43681: doctest forgets previous imports https://bugs.python.org/issue43681 opened by ethan.furman #43682: Make static methods created by @staticmethod callable https://bugs.python.org/issue43682 opened by vstinner #43683: Handle generator (and coroutine) state in the bytecode. https://bugs.python.org/issue43683 opened by Mark.Shannon #43684: Add combined opcodes https://bugs.python.org/issue43684 opened by gvanrossum #43686: re.match appears to hang with certain combinations of pattern https://bugs.python.org/issue43686 opened by alegrigoriev #43688: [C API] Support the limited C API in debug mode (Py_INCREF and https://bugs.python.org/issue43688 opened by vstinner #43689: difflib: mention other "problematic" characters in documentati https://bugs.python.org/issue43689 opened by jugmac00 #43693: Logically merge cell and locals array. They are already contig https://bugs.python.org/issue43693 opened by Mark.Shannon #43696: High cpu usage using asyncio streams https://bugs.python.org/issue43696 opened by romikforest #43697: Importlib documentation does not cover how meta path finders s https://bugs.python.org/issue43697 opened by paul.moore #43698: Use syntactically correct examples on abc package page https://bugs.python.org/issue43698 opened by Vladimir Ryabtsev #43699: ERROR: Could not find a version that satisfies the requirement https://bugs.python.org/issue43699 opened by andre_luis #43701: Add this optionality https://bugs.python.org/issue43701 opened by mablue #43702: [Windows] correctly sort and remove duplicates in _winapi gete https://bugs.python.org/issue43702 opened by eryksun #43703: xml.etree parser does not accept valid control characters https://bugs.python.org/issue43703 opened by Romuald #43704: ShareableList() raises TypeError when passing "name" keyword https://bugs.python.org/issue43704 opened by steve.newcomb #43705: [docs] Document that SyntaxError's offsets are 1-indexed https://bugs.python.org/issue43705 opened by ammar2 #43706: enumerate() instantiation time reducing by using PEP 590 vecto https://bugs.python.org/issue43706 opened by corona10 #43707: onerror in tempfile has an invalid raise expression https://bugs.python.org/issue43707 opened by max-sixty Most recent 15 issues with no replies (15) ========================================== #43707: onerror in tempfile has an invalid raise expression https://bugs.python.org/issue43707 #43706: enumerate() instantiation time reducing by using PEP 590 vecto https://bugs.python.org/issue43706 #43705: [docs] Document that SyntaxError's offsets are 1-indexed https://bugs.python.org/issue43705 #43704: ShareableList() raises TypeError when passing "name" keyword https://bugs.python.org/issue43704 #43702: [Windows] correctly sort and remove duplicates in _winapi gete https://bugs.python.org/issue43702 #43701: Add this optionality https://bugs.python.org/issue43701 #43698: Use syntactically correct examples on abc package page https://bugs.python.org/issue43698 #43696: High cpu usage using asyncio streams https://bugs.python.org/issue43696 #43689: difflib: mention other "problematic" characters in documentati https://bugs.python.org/issue43689 #43683: Handle generator (and coroutine) state in the bytecode. https://bugs.python.org/issue43683 #43679: ttk.Sizegrip disappears under Windows 10 UI Scaling, with dpiA https://bugs.python.org/issue43679 #43678: TypeError: get() got an unexpected keyword argument 'vars' https://bugs.python.org/issue43678 #43676: Doctest ELLIPSIS explanation hard to follow when they're missi https://bugs.python.org/issue43676 #43672: Raise ImportWarning when calling find_loader() https://bugs.python.org/issue43672 #43669: PEP 644: Require OpenSSL 1.1.1 or newer https://bugs.python.org/issue43669 Most recent 15 issues waiting for review (15) ============================================= #43706: enumerate() instantiation time reducing by using PEP 590 vecto https://bugs.python.org/issue43706 #43705: [docs] Document that SyntaxError's offsets are 1-indexed https://bugs.python.org/issue43705 #43693: Logically merge cell and locals array. They are already contig https://bugs.python.org/issue43693 #43688: [C API] Support the limited C API in debug mode (Py_INCREF and https://bugs.python.org/issue43688 #43684: Add combined opcodes https://bugs.python.org/issue43684 #43683: Handle generator (and coroutine) state in the bytecode. https://bugs.python.org/issue43683 #43682: Make static methods created by @staticmethod callable https://bugs.python.org/issue43682 #43680: Remove undocumented io.OpenWrapper and _pyio.OpenWrapper https://bugs.python.org/issue43680 #43672: Raise ImportWarning when calling find_loader() https://bugs.python.org/issue43672 #43669: PEP 644: Require OpenSSL 1.1.1 or newer https://bugs.python.org/issue43669 #43667: Solaris: Fix broken Unicode encoding in non-UTF locales https://bugs.python.org/issue43667 #43666: AIX: Lib/_aix_support.py may break in a WPAR environment https://bugs.python.org/issue43666 #43659: AIX: test_curses crashes buildbot https://bugs.python.org/issue43659 #43656: StackSummary.format fails if str(value) fails https://bugs.python.org/issue43656 #43655: Tkinter: Not setting _NET_WM_WINDOW_TYPE on FileDialog https://bugs.python.org/issue43655 Top 10 most discussed issues (10) ================================= #43567: regen.vcxproj cannot regenerate some necessary files https://bugs.python.org/issue43567 19 msgs #43636: test_descr fails randomly when executed with -R : https://bugs.python.org/issue43636 12 msgs #43510: PEP 597: Implemente encoding="locale" option and EncodingWarni https://bugs.python.org/issue43510 10 msgs #43659: AIX: test_curses crashes buildbot https://bugs.python.org/issue43659 10 msgs #43688: [C API] Support the limited C API in debug mode (Py_INCREF and https://bugs.python.org/issue43688 10 msgs #43624: Add underscore as a decimal separator for string formatting https://bugs.python.org/issue43624 9 msgs #43682: Make static methods created by @staticmethod callable https://bugs.python.org/issue43682 8 msgs #43605: Eval/exec and comprehension scopes unclear in documentation https://bugs.python.org/issue43605 7 msgs #27129: Wordcode, part 2 https://bugs.python.org/issue27129 6 msgs #37773: ValueError: I/O operation on closed file. in ZipFile destructo https://bugs.python.org/issue37773 6 msgs Issues closed (63) ================== #24160: Pdb sometimes raises exception when trying to remove a breakpo https://bugs.python.org/issue24160 closed by iritkatriel #25643: Python tokenizer rewriting https://bugs.python.org/issue25643 closed by pablogsal #26053: regression in pdb output between 2.7 and 3.5 https://bugs.python.org/issue26053 closed by iritkatriel #26300: "unpacked" bytecode https://bugs.python.org/issue26300 closed by Mark.Shannon #29505: Submit the re, json, csv, & struct modules to oss-fuzz testing https://bugs.python.org/issue29505 closed by ammar2 #32408: Performance regression in urllib.proxy_bypass_environment https://bugs.python.org/issue32408 closed by xiang.zhang #32671: redesign Windows os.getlogin, and add os.getuser https://bugs.python.org/issue32671 closed by eryksun #33757: Failed separate test_pdb_next_command_in_generator_for_loop in https://bugs.python.org/issue33757 closed by iritkatriel #35440: Setup failed 0x80072f7d - Unspecified error https://bugs.python.org/issue35440 closed by eryksun #35930: Raising an exception raised in a "future" instance will create https://bugs.python.org/issue35930 closed by jcea #36319: Erro 0xC0000374 on windows 10 https://bugs.python.org/issue36319 closed by eryksun #36792: [Windows] time: crash on formatting time with de_DE locale https://bugs.python.org/issue36792 closed by eryksun #37448: obmalloc: radix tree for tracking arena address ranges https://bugs.python.org/issue37448 closed by nascheme #37945: [Windows] test_locale.TestMiscellaneous.test_getsetlocale_issu https://bugs.python.org/issue37945 closed by vstinner #38794: Setup: support linking openssl statically https://bugs.python.org/issue38794 closed by christian.heimes #39231: Mistaken notion in tutorial https://bugs.python.org/issue39231 closed by terry.reedy #39369: Doc: Update mmap readline method documentation https://bugs.python.org/issue39369 closed by iritkatriel #40012: Avoid Python 2 documentation to appear in Web search results https://bugs.python.org/issue40012 closed by ammar2 #40705: use-after-free in _zoneinfo.c's module_free function https://bugs.python.org/issue40705 closed by ammar2 #40932: subprocess docs should warn of shlex use on Windows https://bugs.python.org/issue40932 closed by ammar2 #41283: The parameter name for imghdr.what in the documentation is wro https://bugs.python.org/issue41283 closed by ammar2 #41369: Update to libmpdec-2.5.1 https://bugs.python.org/issue41369 closed by pitrou #41638: Error message: sqlite3.ProgrammingError: You did not supply a https://bugs.python.org/issue41638 closed by serhiy.storchaka #41670: ceval traces code differently with USE_COMPUTED_GOTOS https://bugs.python.org/issue41670 closed by ammar2 #42041: venv subprocess call to python resolves to wrong interpreter https://bugs.python.org/issue42041 closed by eryksun #42134: Raise ImportWarning when falling back to find_module() https://bugs.python.org/issue42134 closed by brett.cannon #42136: [importlib] deprecate module_repr() methods https://bugs.python.org/issue42136 closed by brett.cannon #42225: Tkinter hangs or crashes when displaying astral chars https://bugs.python.org/issue42225 closed by terry.reedy #42855: pathlib.exists on Windows raises an exception on URL like/bad https://bugs.python.org/issue42855 closed by eryksun #42988: [security] CVE-2021-3426: Information disclosure via pydoc -p: https://bugs.python.org/issue42988 closed by vstinner #43125: Trying To Concatenate Bytes and String in SMTPLIB https://bugs.python.org/issue43125 closed by corona10 #43330: xmlrpc.Server URI query and fragment are discarded from HTTP q https://bugs.python.org/issue43330 closed by Julien Castiaux #43433: xmlrpc.client ignores query in URI ("?action=xmlrpc2") since p https://bugs.python.org/issue43433 closed by vstinner #43466: ssl/hashlib: Add configure option to set or auto-detect rpath https://bugs.python.org/issue43466 closed by christian.heimes #43562: test_ssl.NetworkedTests.test_timeout_connect_ex fails if netwo https://bugs.python.org/issue43562 closed by vstinner #43576: python3.6.4 os.environ error when write chinese to file https://bugs.python.org/issue43576 closed by vstinner #43609: ast.unparse-ing a FunctionType gives ambiguous result https://bugs.python.org/issue43609 closed by BTaskaya #43617: Missing definition in configure.ac causing autoreconf to creat https://bugs.python.org/issue43617 closed by christian.heimes #43631: Update to OpenSSL 1.1.1k https://bugs.python.org/issue43631 closed by christian.heimes #43637: winreg: SetValueEx leaks memory if PySys_Audit fails https://bugs.python.org/issue43637 closed by corona10 #43644: importlib.resources.as_file undocumented https://bugs.python.org/issue43644 closed by jaraco #43645: xmlrpc.client.ServerProxy silently drops query string from URI https://bugs.python.org/issue43645 closed by serhiy.storchaka #43647: Sudden crash displaying certain characters in tk widget https://bugs.python.org/issue43647 closed by terry.reedy #43648: Remove redundant datefmt option in logging file config https://bugs.python.org/issue43648 closed by vinay.sajip #43653: Typo in the random.shuffle docs https://bugs.python.org/issue43653 closed by Akarys #43657: shutil.rmtree fails on readonly files in Windows, onerror not https://bugs.python.org/issue43657 closed by homerun4711 #43660: Segmentation fault when overriding sys.stderr https://bugs.python.org/issue43660 closed by pablogsal #43662: test_tools: test_reindent_file_with_bad_encoding() fails RHEL7 https://bugs.python.org/issue43662 closed by vstinner #43665: AIX: test_importlib regression (ENV change) https://bugs.python.org/issue43665 closed by vstinner #43670: Typo in 3.10 changelog https://bugs.python.org/issue43670 closed by methane #43673: Missing stub for logging attribute manager https://bugs.python.org/issue43673 closed by wdwilcox #43674: strange effect at recursion limit https://bugs.python.org/issue43674 closed by eryksun #43675: test https://bugs.python.org/issue43675 closed by eric.smith #43677: Descriptor.rst - Reference to Py_MethodType is not up to date https://bugs.python.org/issue43677 closed by rhettinger #43685: __call__ not being called on metaclass https://bugs.python.org/issue43685 closed by joel.larose #43687: use unicode_state empty string before unicode_init. without de https://bugs.python.org/issue43687 closed by vstinner #43690: [C API] stable_abi.py script must not include PyType_HasFeatur https://bugs.python.org/issue43690 closed by vstinner #43691: Comparison of OrderedDict() and dict() https://bugs.python.org/issue43691 closed by rhettinger #43692: Raise SyntaxError on implicit string concatentation in list https://bugs.python.org/issue43692 closed by carsten.docktor #43694: Tkinter scaling does not work on some linux systems https://bugs.python.org/issue43694 closed by serhiy.storchaka #43695: Improve `=` in f-strings https://bugs.python.org/issue43695 closed by eric.smith #43700: Replace Zulip badge with Discourse badge in README https://bugs.python.org/issue43700 closed by zach.ware #1634034: Show "expected" token on syntax error https://bugs.python.org/issue1634034 closed by pablogsal

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[RELEASE] Python 3.9.3 and 3.8.9 are now available
by Łukasz Langa April 2, 2021

April 2, 2021

Those are expedited security releases, recommended to all users. Get them here: https://www.python.org/downloads/release/python-393/ <https://www.python.org/downloads/release/python-393/> https://www.python.org/downloads/release/python-389/ <https://www.python.org/downloads/release/python-389/> Security Content bpo-43631 <https://bugs.python.org/issue43631>: high-severity CVE-2021-3449 and CVE-2021-3450 were published for OpenSSL, it’s been upgraded to 1.1.1k in CI, and macOS and Windows installers. bpo-42988 <https://bugs.python.org/issue42988>: CVE-2021-3426: Remove the getfile feature of the pydoc module which could be abused to read arbitrary files on the disk (directory traversal vulnerability). Moreover, even source code of Python modules can contain sensitive data like passwords. Vulnerability reported by David Schwörer. bpo-43285 <https://bugs.python.org/issue43285>: ftplib no longer trusts the IP address value returned from the server in response to the PASV command by default. This prevents a malicious FTP server from using the response to probe IPv4 address and port combinations on the client network. Code that requires the former vulnerable behavior may set a trust_server_pasv_ipv4_address attribute on their ftplib.FTP instances to True to re-enable it. bpo-43439 <https://bugs.python.org/issue43439>: Add audit hooks for gc.get_objects(), gc.get_referrers() and gc.get_referents(). Patch by Pablo Galindo. <https://discuss.python.org/t/python-3-9-3-and-3-8-9-are-now-available/8024#…>Release Calendar Due to the security fixes, those releases are made a month sooner than planned. I decided to keep the release calendar intact, meaning that the last full regular maintenance release of Python 3.8 is still planned for May 3rd 2021, after which it will shift to source releases only for security bug fixes only. Maintenance releases for the 3.9 series will continue at regular bi-monthly intervals, with 3.9.3 planned for May 3rd 2021 as well. <https://discuss.python.org/t/python-3-9-3-and-3-8-9-are-now-available/8024#…>What’s new? The Python 3.9 series contains many new features and optimizations over 3.8. See the “What’s New in Python 3.9 <https://docs.python.org/3.9/whatsnew/3.9.html>” document for more information about features included in the 3.9 series. We also have a detailed change log for 3.9.3 <https://docs.python.org/release/3.9.3/whatsnew/changelog.html> specifically. Detailed information about all changes made in version 3.8.9 can be found in its respective changelog <https://docs.python.org/release/3.8.9/whatsnew/changelog.html>. <https://discuss.python.org/t/python-3-9-3-and-3-8-9-are-now-available/8024#…>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, Ned Deily @nad <https://discuss.python.org/u/nad> Steve Dower @steve.dower <https://discuss.python.org/u/steve.dower> Łukasz Langa @ambv <https://discuss.python.org/u/ambv>

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Weird io.OpenWrapper hack to use a function as method
by Victor Stinner April 1, 2021

April 1, 2021

Hi, The io module provides an open() function. It also provides an OpenWrapper which only exists to be able to store open as a method (class or instance method). In the _pyio module, pure Python implementation of the io module, OpenWrapper is implemented as: class OpenWrapper: """Wrapper for builtins.open Trick so that open won't become a bound method when stored as a class variable (as dbm.dumb does). See initstdio() in Python/pylifecycle.c. """ def __new__(cls, *args, **kwargs): return open(*args, **kwargs) I would like to remove this class which is causing troubles in the PEP 597 implementation, but I don't know how. Simplified problem: --- def func(): print("my func") class MyClass: method = func func() # A MyClass.method() # B obj = MyClass() obj.method() # C --- With this syntax, A and B work, but C fails with TypeError: func() takes 0 positional arguments but 1 was given. If I decorate func() with @staticmethod, B and C work, but A fails with TypeError: 'staticmethod' object is not callable. Is OpenWrapper the only way to have a callable object which works in the 3 variants A, B and C? A, B and C work if MyClass is modified to use staticmethod: class MyClass: method = staticmethod(func) Victor -- Night gathers, and now my watch begins. It shall not end until my death.

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