Mailman 3 December 2019 - Python-Dev

Python Documentation and AIX specifics - how to proceed?
by Michael Jan. 7, 2020

Jan. 7, 2020

First - best wishes all for a happy and healthy 2020! As my nickname implies - my primary means to contribute to Python is with regard to AIX. One of the things I recently came across is Misc/README.AIX which was last updated sometime between 2010 and 2014. I am thinking a facelift is in order. Assuming 2010-2011 as the original date - much has changed and many of the comments are no longer accurate. Before saying so, I would like to check here that - having all tests pass on the 3.8 bot implies that there are no outstanding issues. As to the historical issues in the current document - these could either be deleted, or a short text describing when they were resolved (e.g., Python 3.7, or just resolved, but noone knows exactly how or when - whether it was a Python change, or a platform (AIX) change. What I see as being more relevant is the description re: how to build Python for AIX - for the "do it youself"-ers. So, besides the direct question re: what to say about the old "known issues" and whether there are no known issues aka, no issues identified via the standard tests - I would appreciate feedback on what is considered appropriate - anno 2020 - for any Misc/README.platform text. Additionally, I am willing to work on other areas of the standard documentation where it is either needed or considered appropriate for platform specific details and/or examples. This is not something I would try to get done in a single PR, Instead I am thinking a single -longer term- issue - and multiple PR's to work through corrections and additions during 2020. Focus on Python 3.9 and beyond yet where appropriate backlevel to Python 3.8 or even 3.7. Sincerely, Michael

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PEP 558: Defined semantics for locals() (December 2019 edition)
by Nick Coghlan Jan. 1, 2020

Jan. 1, 2020

Hi folks, I've finally updated PEP 558 and it's reference implementation based on Nathaniel's feedback back in May. The latest version of the PEP can now be found at https://www.python.org/dev/peps/pep-0558/, and I've created a discussion thread on Discourse: https://discuss.python.org/t/pep-558-defined-semantics-for-locals/2936 The latest version implements Nathaniel's "independent snapshot" proposal, and I like how that has turned out. The one thing that changed from the May discussion thread is that the refcount semantics of PyEval_GetLocals() (it returns a borrowed reference) meant that it had to keep the old behaviour of returning a reference to the internal dynamically updated shared "snapshot" at function scope, with a new API, PyEval_GetPyLocals(), providing the C equivalent of the locals() builtin. Cheers, Nick. -- Nick Coghlan | ncoghlan(a)gmail.com | Brisbane, Australia

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Summary of Python tracker Issues
by Python tracker Dec. 27, 2019

Dec. 27, 2019

ACTIVITY SUMMARY (2019-12-20 - 2019-12-27) 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 7203 ( +3) closed 43688 (+26) total 50891 (+29) Open issues with patches: 2824 Issues opened (21) ================== #39111: Misleading documentation for NotImplemented https://bugs.python.org/issue39111 reopened by steven.daprano #39112: Misleading documentation for tuple https://bugs.python.org/issue39112 opened by sberens #39114: Python 3.9.0a2 changed how finally/return is traced https://bugs.python.org/issue39114 opened by nedbat #39116: StreamReader.readexactly() raises GeneratorExit on ProactorEve https://bugs.python.org/issue39116 opened by twisteroid ambassador #39117: Performance regression for making bound methods https://bugs.python.org/issue39117 opened by rhettinger #39121: gzip header write OS field https://bugs.python.org/issue39121 opened by wungad #39122: Environment variable PYTHONUSERBASE is not set during customiz https://bugs.python.org/issue39122 opened by sarmar11 #39123: PyThread_xxx() not available when using limited API https://bugs.python.org/issue39123 opened by VZ #39125: Type signature of @property not shown in help() https://bugs.python.org/issue39125 opened by McSinyx #39126: Non-bmp (astral) unicode characters confuse the editor https://bugs.python.org/issue39126 opened by dmaxime #39127: _Py_HashPointer's void * argument should be const https://bugs.python.org/issue39127 opened by petdance #39128: Document happy eyeball parameters in loop.create_connection si https://bugs.python.org/issue39128 opened by xtreak #39129: Incorrect import of TimeoutError while creating happy eyeballs https://bugs.python.org/issue39129 opened by xtreak #39130: Dict is reversable from v3.8 and should say that in the doc https://bugs.python.org/issue39130 opened by khalidmammadov #39131: signing needs two serialisation passes https://bugs.python.org/issue39131 opened by jap #39133: threading lib. working improperly on idle window https://bugs.python.org/issue39133 opened by Pyjeet #39134: can't construct dataclass as ABC (or runtime check as data pro https://bugs.python.org/issue39134 opened by cybertreiber #39136: Typos in whatsnew file and docs https://bugs.python.org/issue39136 opened by xtreak #39137: create_unicode_buffer() gives different results on Windows vs https://bugs.python.org/issue39137 opened by lazka #39138: import a pycapsule object that's attached on many modules https://bugs.python.org/issue39138 opened by yorkie #39139: Reference to depricated collections.abc class in collections i https://bugs.python.org/issue39139 opened by khalidmammadov Most recent 15 issues with no replies (15) ========================================== #39137: create_unicode_buffer() gives different results on Windows vs https://bugs.python.org/issue39137 #39136: Typos in whatsnew file and docs https://bugs.python.org/issue39136 #39130: Dict is reversable from v3.8 and should say that in the doc https://bugs.python.org/issue39130 #39127: _Py_HashPointer's void * argument should be const https://bugs.python.org/issue39127 #39123: PyThread_xxx() not available when using limited API https://bugs.python.org/issue39123 #39122: Environment variable PYTHONUSERBASE is not set during customiz https://bugs.python.org/issue39122 #39116: StreamReader.readexactly() raises GeneratorExit on ProactorEve https://bugs.python.org/issue39116 #39104: ProcessPoolExecutor hangs on shutdown nowait with pickling fai https://bugs.python.org/issue39104 #39101: IsolatedAsyncioTestCase freezes when exception is raised https://bugs.python.org/issue39101 #39100: email.policy.SMTP throws AttributeError on invalid header https://bugs.python.org/issue39100 #39098: OSError: handle closed, ProcessPoolExecutor shutdown(wait=Fals https://bugs.python.org/issue39098 #39092: Csv sniffer doesn't attempt to determine and set escape charac https://bugs.python.org/issue39092 #39089: Update IDLE's credits https://bugs.python.org/issue39089 #39088: test_concurrent_futures crashed with python.core core dump on https://bugs.python.org/issue39088 #39072: Azure Pipelines: git clone failed with: OpenSSL SSL_read: Conn https://bugs.python.org/issue39072 Most recent 15 issues waiting for review (15) ============================================= #39139: Reference to depricated collections.abc class in collections i https://bugs.python.org/issue39139 #39131: signing needs two serialisation passes https://bugs.python.org/issue39131 #39130: Dict is reversable from v3.8 and should say that in the doc https://bugs.python.org/issue39130 #39129: Incorrect import of TimeoutError while creating happy eyeballs https://bugs.python.org/issue39129 #39127: _Py_HashPointer's void * argument should be const https://bugs.python.org/issue39127 #39121: gzip header write OS field https://bugs.python.org/issue39121 #39104: ProcessPoolExecutor hangs on shutdown nowait with pickling fai https://bugs.python.org/issue39104 #39102: Increase Enum performance https://bugs.python.org/issue39102 #39091: CPython Segfault in 5 lines of code https://bugs.python.org/issue39091 #39087: [C API] No efficient C API to get UTF-8 string from unicode ob https://bugs.python.org/issue39087 #39058: argparse should preserve argument ordering in Namespace https://bugs.python.org/issue39058 #39057: Issues with urllib.request.proxy_bypass_environment https://bugs.python.org/issue39057 #39056: Issues with handling the -W option https://bugs.python.org/issue39056 #39055: base64.b64decode() with validate=True does not raise for a tra https://bugs.python.org/issue39055 #39050: The "Help" button in IDLE's config dialog does not work https://bugs.python.org/issue39050 Top 10 most discussed issues (7) ================================ #36476: Runtime finalization assumes all other threads have exited. https://bugs.python.org/issue36476 6 msgs #39134: can't construct dataclass as ABC (or runtime check as data pro https://bugs.python.org/issue39134 5 msgs #36051: Drop the GIL during large bytes.join operations? https://bugs.python.org/issue36051 4 msgs #39062: ValueError in TarFile.getmembers https://bugs.python.org/issue39062 4 msgs #38902: image/webp support in mimetypes https://bugs.python.org/issue38902 3 msgs #39075: types.SimpleNamespace should preserve attribute ordering (?) https://bugs.python.org/issue39075 3 msgs #39129: Incorrect import of TimeoutError while creating happy eyeballs https://bugs.python.org/issue39129 3 msgs Issues closed (26) ================== #10401: Globals / builtins cache https://bugs.python.org/issue10401 closed by inada.naoki #20066: PyStructSequence_NewType() not setting proper heap allocation https://bugs.python.org/issue20066 closed by corona10 #23868: Uninitialized objects are tracked by the garbage collector https://bugs.python.org/issue23868 closed by pablogsal #24770: Py_Finalize() doesn't stop daemon threads https://bugs.python.org/issue24770 closed by eric.snow #26845: Misleading variable name in exception handling https://bugs.python.org/issue26845 closed by vstinner #28158: Implement LOAD_GLOBAL opcode cache https://bugs.python.org/issue28158 closed by inada.naoki #30364: Outdated function attribute to disable address sanitizer https://bugs.python.org/issue30364 closed by benjamin.peterson #33609: Document that dicts preserve insertion order https://bugs.python.org/issue33609 closed by inada.naoki #33772: Fix few dead code paths https://bugs.python.org/issue33772 closed by benjamin.peterson #34444: Module's __file__ should be absolute always ("." in sys.path) https://bugs.python.org/issue34444 closed by brett.cannon #36788: Add clamp() function to builtins https://bugs.python.org/issue36788 closed by mark.dickinson #37509: OSError preadv() https://bugs.python.org/issue37509 closed by YoSTEALTH #38753: AsyncMock not cited as new in 3.8 https://bugs.python.org/issue38753 closed by xtreak #38918: Add __module__ entry for function type in inspect docs table. https://bugs.python.org/issue38918 closed by eric.snow #39103: [linux] strftime renders %Y with only 3 characters https://bugs.python.org/issue39103 closed by p-ganssle #39106: Add suggestions to argparse error message output for unrecogni https://bugs.python.org/issue39106 closed by xtreak #39110: UserList-subclass Tree slicing changes the original list unexp https://bugs.python.org/issue39110 closed by eric.snow #39113: PyUnicode_AsUTF8AndSize Sometimes Segfaults With Incomplete Su https://bugs.python.org/issue39113 closed by serhiy.storchaka #39115: Clarify Python MIME type https://bugs.python.org/issue39115 closed by asvetlov #39118: Variables changing values on their own https://bugs.python.org/issue39118 closed by mark.dickinson #39119: email/_header_value_parser.py:parse_message_id: UnblondLocalEr https://bugs.python.org/issue39119 closed by xtreak #39120: pyodbc dll load failed https://bugs.python.org/issue39120 closed by xtreak #39124: round Decimal error https://bugs.python.org/issue39124 closed by mark.dickinson #39132: Adding funcitonality to determine if a constant string node is https://bugs.python.org/issue39132 closed by BTaskaya #39135: time.get_clock_info() documentation still has 'clock' name https://bugs.python.org/issue39135 closed by benjamin.peterson #39140: shutil.move does not work properly with pathlib.Path objects https://bugs.python.org/issue39140 closed by xtreak

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Something wrong with the bug tracker?
by Mark Shannon Dec. 22, 2019

Dec. 22, 2019

Hi, For some reason I can't log into the bug tracker with Google. I just get the error message: """ An error has occurred A problem was encountered processing your request. The tracker maintainers have been notified of the problem. """ Whether I'm logged in or out of Google, or using a private tab, it makes no difference. Anyone else having problems? Cheers, Mark.

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Summary of Python tracker Issues
by Python tracker Dec. 20, 2019

Dec. 20, 2019

ACTIVITY SUMMARY (2019-12-13 - 2019-12-20) 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 7200 (+26) closed 43662 (+45) total 50862 (+71) Open issues with patches: 2822 Issues opened (46) ================== #39041: Support GitHub Actions in CI https://bugs.python.org/issue39041 opened by steve.dower #39042: Use the runtime's main thread ID in the threading module. https://bugs.python.org/issue39042 opened by eric.snow #39046: collections.abc.Reversible should not be a subclass of Hashabl https://bugs.python.org/issue39046 opened by Zac Hatfield-Dodds #39047: TestTemporaryDirectory.test_flags fails on FreeBSD/ZFS https://bugs.python.org/issue39047 opened by attilajeges #39048: Reorder the __aenter__ and __aexit__ method checks for the asy https://bugs.python.org/issue39048 opened by maggyero #39050: The "Help" button in IDLE's config dialog does not work https://bugs.python.org/issue39050 opened by ZackerySpytz #39052: import error when in python -m pdb debug mode https://bugs.python.org/issue39052 opened by chengyang #39055: base64.b64decode() with validate=True does not raise for a tra https://bugs.python.org/issue39055 opened by serhiy.storchaka #39056: Issues with handling the -W option https://bugs.python.org/issue39056 opened by serhiy.storchaka #39057: Issues with urllib.request.proxy_bypass_environment https://bugs.python.org/issue39057 opened by serhiy.storchaka #39058: argparse should preserve argument ordering in Namespace https://bugs.python.org/issue39058 opened by rhettinger #39060: asyncio.Task.print_stack doesn't print the full stack https://bugs.python.org/issue39060 opened by amit7itz #39061: Garbage Collection makes some object live for very long https://bugs.python.org/issue39061 opened by mistasse #39062: ValueError in TarFile.getmembers https://bugs.python.org/issue39062 opened by jvoisin #39064: ValueError in zipfile.ZipFile https://bugs.python.org/issue39064 opened by jvoisin #39065: OSError in TarFile.getmembers() https://bugs.python.org/issue39065 opened by jvoisin #39067: EOFError in tarfile.open https://bugs.python.org/issue39067 opened by jvoisin #39068: Base 85 encoding initialization race condition https://bugs.python.org/issue39068 opened by drmonkeysee #39070: Uninstalling 3.8.0 fails but it says it succeeds.. https://bugs.python.org/issue39070 opened by tuijatuulia #39071: email.parser.BytesParser - parse and parsebytes work not equiv https://bugs.python.org/issue39071 opened by mkaiser #39072: Azure Pipelines: git clone failed with: OpenSSL SSL_read: Conn https://bugs.python.org/issue39072 opened by vstinner #39073: email incorrect handling of crlf in Address objects. https://bugs.python.org/issue39073 opened by jap #39074: Threading memory leak in _shutdown_locks for non-daemon thread https://bugs.python.org/issue39074 opened by krypticus #39075: types.SimpleNamespace should preserve attribute ordering (?) https://bugs.python.org/issue39075 opened by eric.snow #39076: Use types.SimpleNamespace for argparse.Namespace https://bugs.python.org/issue39076 opened by eric.snow #39078: __function.__defaults__ breaks for __init__ of dataclasses wit https://bugs.python.org/issue39078 opened by RunOrVeith #39082: AsyncMock is unable to correctly patch static or class methods https://bugs.python.org/issue39082 opened by czardoz #39085: Improve docs for await expression https://bugs.python.org/issue39085 opened by aeros #39087: [C API] No efficient C API to get UTF-8 string from unicode ob https://bugs.python.org/issue39087 opened by inada.naoki #39088: test_concurrent_futures crashed with python.core core dump on https://bugs.python.org/issue39088 opened by vstinner #39089: Update IDLE's credits https://bugs.python.org/issue39089 opened by taleinat #39090: Document various options for getting the absolute path from pa https://bugs.python.org/issue39090 opened by brett.cannon #39091: CPython Segfault in 5 lines of code https://bugs.python.org/issue39091 opened by skrause #39092: Csv sniffer doesn't attempt to determine and set escape charac https://bugs.python.org/issue39092 opened by evan.whitfield #39093: tkinter objects garbage collected from non-tkinter thread caus https://bugs.python.org/issue39093 opened by obserience #39096: Description of "Format Specification Mini-Language" not accura https://bugs.python.org/issue39096 opened by mamrhein #39098: OSError: handle is closed in ProcessPoolExecutor on shutdown( https://bugs.python.org/issue39098 opened by patbuxton #39100: email.policy.SMTP throws AttributeError on invalid header https://bugs.python.org/issue39100 opened by elenril #39101: IsolatedAsyncioTestCase freezes when exception is raised https://bugs.python.org/issue39101 opened by fornellas #39102: Increase Enum performance https://bugs.python.org/issue39102 opened by MrMrRobat #39103: [linux] strftime renders %Y with only 3 characters https://bugs.python.org/issue39103 opened by jaraco #39104: ProcessPoolExecutor hangs on shutdown nowait with pickling fai https://bugs.python.org/issue39104 opened by tomMoral #39106: Add suggestions to argparse error message output for unrecogni https://bugs.python.org/issue39106 opened by xtreak #39107: Consider building Tkinter with Tk 8.6.10 https://bugs.python.org/issue39107 opened by Aivar.Annamaa #39108: Documentation for "random.gauss" vs "random.normalvariate" is https://bugs.python.org/issue39108 opened by cnewey #39110: It seems that list() changes the value of the parameter https://bugs.python.org/issue39110 opened by ctarn Most recent 15 issues with no replies (15) ========================================== #39108: Documentation for "random.gauss" vs "random.normalvariate" is https://bugs.python.org/issue39108 #39106: Add suggestions to argparse error message output for unrecogni https://bugs.python.org/issue39106 #39104: ProcessPoolExecutor hangs on shutdown nowait with pickling fai https://bugs.python.org/issue39104 #39102: Increase Enum performance https://bugs.python.org/issue39102 #39101: IsolatedAsyncioTestCase freezes when exception is raised https://bugs.python.org/issue39101 #39100: email.policy.SMTP throws AttributeError on invalid header https://bugs.python.org/issue39100 #39098: OSError: handle is closed in ProcessPoolExecutor on shutdown( https://bugs.python.org/issue39098 #39092: Csv sniffer doesn't attempt to determine and set escape charac https://bugs.python.org/issue39092 #39090: Document various options for getting the absolute path from pa https://bugs.python.org/issue39090 #39089: Update IDLE's credits https://bugs.python.org/issue39089 #39088: test_concurrent_futures crashed with python.core core dump on https://bugs.python.org/issue39088 #39072: Azure Pipelines: git clone failed with: OpenSSL SSL_read: Conn https://bugs.python.org/issue39072 #39068: Base 85 encoding initialization race condition https://bugs.python.org/issue39068 #39065: OSError in TarFile.getmembers() https://bugs.python.org/issue39065 #39064: ValueError in zipfile.ZipFile https://bugs.python.org/issue39064 Most recent 15 issues waiting for review (15) ============================================= #39104: ProcessPoolExecutor hangs on shutdown nowait with pickling fai https://bugs.python.org/issue39104 #39102: Increase Enum performance https://bugs.python.org/issue39102 #39091: CPython Segfault in 5 lines of code https://bugs.python.org/issue39091 #39087: [C API] No efficient C API to get UTF-8 string from unicode ob https://bugs.python.org/issue39087 #39058: argparse should preserve argument ordering in Namespace https://bugs.python.org/issue39058 #39057: Issues with urllib.request.proxy_bypass_environment https://bugs.python.org/issue39057 #39056: Issues with handling the -W option https://bugs.python.org/issue39056 #39055: base64.b64decode() with validate=True does not raise for a tra https://bugs.python.org/issue39055 #39050: The "Help" button in IDLE's config dialog does not work https://bugs.python.org/issue39050 #39047: TestTemporaryDirectory.test_flags fails on FreeBSD/ZFS https://bugs.python.org/issue39047 #39041: Support GitHub Actions in CI https://bugs.python.org/issue39041 #39040: Wrong attachement filename when mail mime header was too long https://bugs.python.org/issue39040 #39037: Fix the trial order of the __exit__ and __enter__ methods in t https://bugs.python.org/issue39037 #39035: Travis CI fail on backports: pyvenv not installed https://bugs.python.org/issue39035 #39033: zipimport raises NameError: name '_boostrap_external' is not d https://bugs.python.org/issue39033 Top 10 most discussed issues (10) ================================= #39040: Wrong attachement filename when mail mime header was too long https://bugs.python.org/issue39040 15 msgs #39035: Travis CI fail on backports: pyvenv not installed https://bugs.python.org/issue39035 10 msgs #38295: test_relative_path of test_py_compile fails on macOS 10.15 Cat https://bugs.python.org/issue38295 9 msgs #39087: [C API] No efficient C API to get UTF-8 string from unicode ob https://bugs.python.org/issue39087 7 msgs #39110: It seems that list() changes the value of the parameter https://bugs.python.org/issue39110 6 msgs #39070: Uninstalling 3.8.0 fails but it says it succeeds.. https://bugs.python.org/issue39070 5 msgs #37224: test__xxsubinterpreters fails randomly https://bugs.python.org/issue37224 4 msgs #38904: "signal only works in main thread" in main thread https://bugs.python.org/issue38904 4 msgs #39037: Fix the trial order of the __exit__ and __enter__ methods in t https://bugs.python.org/issue39037 4 msgs #39067: EOFError in tarfile.open https://bugs.python.org/issue39067 4 msgs Issues closed (43) ================== #34000: Document when compile returns a code object v. AST https://bugs.python.org/issue34000 closed by cheryl.sabella #36095: Better NaN sorting. https://bugs.python.org/issue36095 closed by tim.peters #36406: doctest.testmod(empty_package) raises TypeError in 3.7 (and no https://bugs.python.org/issue36406 closed by xtreak #36500: Add "regen-*" equivalent projects for Windows builds https://bugs.python.org/issue36500 closed by steve.dower #36589: Incorrect error handling in curses.update_lines_cols() https://bugs.python.org/issue36589 closed by cheryl.sabella #37762: IDLE very slow due a super long line output in chunks https://bugs.python.org/issue37762 closed by terry.reedy #38021: Modify AIX platform_tag so it provides PEP425 needs https://bugs.python.org/issue38021 closed by ncoghlan #38316: docs: Code object's "co_stacksize" field is described with mis https://bugs.python.org/issue38316 closed by vstinner #38348: Make python -m ast more configurable https://bugs.python.org/issue38348 closed by vstinner #38546: test_concurrent_futures: reap_children() warnings on RHEL7 and https://bugs.python.org/issue38546 closed by vstinner #38629: float is missing __ceil__() and __floor__(), required by numbe https://bugs.python.org/issue38629 closed by vstinner #38720: Logging failure with timestamp messages https://bugs.python.org/issue38720 closed by cheryl.sabella #38811: Pathlib crashes when os module is missing 'link' method https://bugs.python.org/issue38811 closed by vstinner #38993: cProfile behaviour issue with decorator and math.factorial() l https://bugs.python.org/issue38993 closed by mark.dickinson #39025: Windows Python Launcher does not update PATH to Scripts direct https://bugs.python.org/issue39025 closed by bluebird #39028: ENH: Fix performance issue in keyword extraction https://bugs.python.org/issue39028 closed by inada.naoki #39031: Inconsistency with lineno and col_offset info when parsing eli https://bugs.python.org/issue39031 closed by gvanrossum #39036: Add center_char attribute to str type https://bugs.python.org/issue39036 closed by rhettinger #39043: Add math.fib() generator https://bugs.python.org/issue39043 closed by rhettinger #39044: Segfault on build for the master branch https://bugs.python.org/issue39044 closed by nanjekyejoannah #39045: Segmentation of string https://bugs.python.org/issue39045 closed by SilentGhost #39049: Add "elif" to "for_stmt" and "while_stmt" https://bugs.python.org/issue39049 closed by rhettinger #39051: Python not working on Windows 10 https://bugs.python.org/issue39051 closed by rafaeldominiquini #39053: Hide manually raised exception formatting https://bugs.python.org/issue39053 closed by SilentGhost #39054: Add an parameter to list.remove() https://bugs.python.org/issue39054 closed by SilentGhost #39059: Getting incorrect results in rounding procedures https://bugs.python.org/issue39059 closed by mark.dickinson #39063: Format string does not work with "in" statement https://bugs.python.org/issue39063 closed by ramon.rnm(a)gmail.com #39066: Expose SOABI setting in the header https://bugs.python.org/issue39066 closed by mathstuf #39069: Move ast.unparse() function to a different module https://bugs.python.org/issue39069 closed by pablogsal #39077: Numeric formatting inconsistent between int, float and Decimal https://bugs.python.org/issue39077 closed by mamrhein #39079: help() modifies the string module https://bugs.python.org/issue39079 closed by zach.ware #39080: Inconsistency with Starred Expression line/col info https://bugs.python.org/issue39080 closed by pablogsal #39081: pathlib '/' operator does not resolve Enums with str mixin as https://bugs.python.org/issue39081 closed by brett.cannon #39083: Dictionary get(key, default-expression) not short circuit beha https://bugs.python.org/issue39083 closed by eric.smith #39084: string.letters is flipped after setlocale is called https://bugs.python.org/issue39084 closed by zach.ware #39086: Division "/" error on Long Integers https://bugs.python.org/issue39086 closed by steven.daprano #39094: Add a default to statistics.mean and related functions https://bugs.python.org/issue39094 closed by steven.daprano #39095: Negative Array Index not Yielding "Index Out Of Bounds" https://bugs.python.org/issue39095 closed by zach.ware #39097: The description of multiprocessing.cpu_count() is not accurate https://bugs.python.org/issue39097 closed by asvetlov #39099: scandir.dirfd() method https://bugs.python.org/issue39099 closed by giampaolo.rodola #39105: Spam https://bugs.python.org/issue39105 closed by xtreak #39109: [C-API] PyUnicode_FromString https://bugs.python.org/issue39109 closed by vstinner #39111: Misleading documentation https://bugs.python.org/issue39111 closed by brett.cannon

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Thread argument for exc_info and public API
by Julien Danjou Dec. 20, 2019

Dec. 20, 2019

Hi there, I've been poking around the thread state API and error/exception handling, and there's something missing I'd like to see happening. The only way to retrieve the current exception is via sys.excinfo or PyErr_GetExcInfo in C. However, the issue is that they don't take a PyThreadState as argument, but use _PyThreadState_GET() to retrieve the thread state. That makes it impossible to retrieve the exception information for a different thread than the one calling the function. In order to retrieve the exception from *any* PyThreadState, the caller has to use _PyErr_GetTopmostException which takes a PyThreadState as argument — though that function is private and therefore not documented or usable in an external module (in theory at least). Should we make _PyErr_GetTopmostException public, or implement something different to retrieve the top most exception from a PyThreadState? Cheers, -- Julien Danjou # Free Software hacker # https://julien.danjou.info

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[RELEASE] Python 3.8.1, 3.7.6, 3.6.10, and 3.9.0a2 are now available!
by Łukasz Langa Dec. 19, 2019

Dec. 19, 2019

from locale import seasons_greetings seasons_greetings() On behalf of the entire Python development community, and the currently serving Python release team in particular, I'm pleased to announce the unprecedented combined release of no less than four versions of Python. Let's dig in! Python 3.8.1 Python 3.8.1 is the first maintenance release of Python 3.8. The Python 3.8 series is the newest feature release of the Python language, and it contains many new features and optimizations. You can find Python 3.8.1 here: https://www.python.org/downloads/release/python-381/ <https://www.python.org/downloads/release/python-381/> See the “What’s New in Python 3.8 <https://docs.python.org/3.8/whatsnew/3.8.html>” document for more information about features included in the 3.8 series. Detailed information about all changes made in 3.8.1 can be found in its change log <https://docs.python.org/release/3.8.1/whatsnew/changelog.html#changelog>. Maintenance releases for the 3.8 series will continue at regular bi-monthly intervals, with 3.8.2 planned for February 2020. Python 3.7.6 Python 3.7.6, the next bugfix release of Python 3.7, is also available. You can find the release files, a link to the change log, and more information here: https://www.python.org/downloads/release/python-376/ <https://www.python.org/downloads/release/python-376/> Python 3.9.0a2 An early developer preview of Python 3.9 is also ready: https://www.python.org/downloads/release/python-390a2/ <https://www.python.org/downloads/release/python-390a2/> Python 3.9 is still in development. This releasee, 3.9.0a2 is the second of six 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 (2020-05-18) and, if necessary, may be modified or deleted up until the release candidate phase (2020-08-10). Please keep in mind that this is a preview release and its use is not recommended for production environments. Python 3.6.10 And, one more thing: Python 3.6.10, the next security fix release of Python 3.6, is also available: https://www.python.org/downloads/release/python-3610/ <https://www.python.org/downloads/release/python-3610/> We hope you enjoy all those! 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. https://www.python.org/psf/ <https://www.python.org/psf/> Your friendly release team, Ned Deily Steve Dower Łukasz Langa

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sqlite3 module and thread-safe SQLite library
by Kacvinsky, Tom Dec. 18, 2019

Dec. 18, 2019

We ran into an issue where having the SQLite library built with -DSQLITE_THREADSAFE=0, but then the sqlite3 module (really, the _sqlite3.so0 crashing in threading code. So I have to ask if it is intended that the sqlite3 Python module always be built with a thread safe SQLite library. Thanks, Tom

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Parameters of str(), bytes() and bytearray()
by Serhiy Storchaka Dec. 17, 2019

Dec. 17, 2019

Currently str() takes up to 3 arguments. All are optional and positional-or-keyword. All combinations are valid: str() str(object=object) str(object=buffer, encoding=encoding) str(object=buffer, errors=errors) str(object=buffer, encoding=encoding, errors=errors) str(encoding=encoding) str(errors=errors) str(encoding=encoding, errors=errors) The last three are especially surprising. If you do not specify an object, str() ignores values of encoding and errors and returns an empty string. bytes() and bytearray() are more limited. Valid combinations are: bytes() bytes(source=object) bytes(source=string, encoding=encoding) bytes(source=string, encoding=encoding, errors=errors) I propose several changes: 1. Forbids calling str() without object if encoding or errors are specified. It is very unlikely that this can break a real code, so I propose to make it an error without a deprecation period. 2. Make the first parameter of str(), bytes() and bytearray() positional-only. Originally this feature was an implementation artifact: before 3.6 parameters of a C implemented function should be either all positional-only (if used PyArg_ParseTuple), or all keyword (if used PyArg_ParseTupleAndKeywords). So str(), bytes() and bytearray() accepted the first parameter by keyword. We already made similar changes for int(), float(), etc: int(x=42) no longer works. Unlikely str(object=object) is used in a real code, so we can skip a deprecation period for this change too. 3. Make encoding required if errors is specified in str(). This will reduce the number of possible combinations, makes str() more similar to bytes() and bytearray() and simplify the mental model: if encoding is specified, then we decode, and the first argument must be a bytes-like object, otherwise we convert an object to a string using __str__.

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Travis CI for backports not working.
by Terry Reedy Dec. 16, 2019

Dec. 16, 2019

Travis passed https://github.com/python/cpython/pull/17366 but a half hour later twice failed https://github.com/python/cpython/pull/17370 https://github.com/python/cpython/pull/17371 saying pyenv: python3.8: command not found pyenv: version `3.7.1' not installed -- Terry Jan Reedy

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