Mailman 3 March 2020 - Python-Dev

Pull Request bpo-1812
by Peter Donis 13 Mar '20

13 Mar '20

Can someone please review the subject pull request? Pull request link here: https://github.com/python/cpython/pull/17385 Issue tracker link here: https://bugs.python.org/issue1812 Thank you very much! Peter Donis pdonis(a)peterdonis.net

4 6

Summary of Python tracker Issues
by Python tracker 13 Mar '20

13 Mar '20

ACTIVITY SUMMARY (2020-03-06 - 2020-03-13) 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 7357 ( -2) closed 44350 (+80) total 51707 (+78) Open issues with patches: 2877 Issues opened (52) ================== #14126: Speed up list comprehensions by preallocating the list where p https://bugs.python.org/issue14126 reopened by vstinner #26227: Windows: socket.gethostbyaddr(name) fails for non-ASCII hostna https://bugs.python.org/issue26227 reopened by steve.dower #39321: AMD64 FreeBSD Non-Debug 3.x: main regrtest process killed by S https://bugs.python.org/issue39321 reopened by vstinner #39829: __len__ called twice in the list() constructor https://bugs.python.org/issue39829 reopened by eric.snow #39879: Update language reference to specify that dict is insertion-or https://bugs.python.org/issue39879 opened by eric.snow #39881: Multiple Interpreters in the Stdlib (PEP 554) - High-level Imp https://bugs.python.org/issue39881 opened by nanjekyejoannah #39882: Py_FatalError(): log automatically the function name https://bugs.python.org/issue39882 opened by vstinner #39883: Use BSD0 license for code in docs https://bugs.python.org/issue39883 opened by toddrjen #39885: IDLE right click outside of any selection should clear it https://bugs.python.org/issue39885 opened by terry.reedy #39887: Duplicate C object description of vectorcallfunc https://bugs.python.org/issue39887 opened by serhiy.storchaka #39891: [difflib] Improve get_close_matches() to better match when cas https://bugs.python.org/issue39891 opened by brian.gallagher #39892: Enable DeprecationWarnings by default when not explicit in uni https://bugs.python.org/issue39892 opened by gregory.p.smith #39894: `pathlib.Path.samefile()` calls `os.stat()` without using acce https://bugs.python.org/issue39894 opened by barneygale #39895: `pathlib.Path.touch()` calls `os.close()` without using access https://bugs.python.org/issue39895 opened by barneygale #39897: `pathlib.Path.is_mount()` calls `Path(self.parent)` and theref https://bugs.python.org/issue39897 opened by barneygale #39901: `pathlib.Path.owner()` and `group()` use `pwd` and `grp` modul https://bugs.python.org/issue39901 opened by barneygale #39902: dis.Bytecode objects should be comparable https://bugs.python.org/issue39902 opened by BTaskaya #39906: pathlib.Path: add `follow_symlinks` argument to `stat()` and ` https://bugs.python.org/issue39906 opened by barneygale #39908: Remove unused args from init_set_builtins_open and _Py_FatalEr https://bugs.python.org/issue39908 opened by petdance #39910: os.ftruncate on Windows should be sparse https://bugs.python.org/issue39910 opened by Artoria2e5 #39912: warnings.py should not raise AssertionError when validating ar https://bugs.python.org/issue39912 opened by remi.lapeyre #39913: Document warnings.WarningMessage ? https://bugs.python.org/issue39913 opened by blueyed #39914: logging.config: '.' (dot) as a key is not documented https://bugs.python.org/issue39914 opened by Yuta Okamoto #39915: await_args_list in AsyncMock always refers to the last awaited https://bugs.python.org/issue39915 opened by Mads Sejersen #39917: new_compiler() called 2nd time causes error https://bugs.python.org/issue39917 opened by televi #39919: C extension code reliant on static flags/behavior with PY_DEBU https://bugs.python.org/issue39919 opened by ngie #39920: os.stat() and os.lstat() fail with Windows device paths https://bugs.python.org/issue39920 opened by Charles Machalow #39924: pathlib handles missing `os.link`, `os.symlink` and `os.readli https://bugs.python.org/issue39924 opened by barneygale #39927: IDLE.app fails on macOS 10.15 if denied access to Documents https://bugs.python.org/issue39927 opened by dd789 #39929: dataclasses.asdict will mangle collection.Counter instances https://bugs.python.org/issue39929 opened by brad.scarlett(a)gmail.com #39931: Global variables are not accessible from child processes (mult https://bugs.python.org/issue39931 opened by agmt #39932: test_multiprocessing_fork leaked [0, 2, 0] file descriptors on https://bugs.python.org/issue39932 opened by vstinner #39933: test_gdb fails on AMD64 FreeBSD Shared 3.x: ptrace: Operation https://bugs.python.org/issue39933 opened by vstinner #39934: Fatal Python error "XXX block stack overflow" when exception s https://bugs.python.org/issue39934 opened by myzhang1029 #39935: argparse: help parameter not documented in add_subparsers().ad https://bugs.python.org/issue39935 opened by Nazime Koussaila Lakehal #39937: Suggest the usage of Element.iter() instead of iter() in whats https://bugs.python.org/issue39937 opened by rahul-kumi #39939: Add str methods to remove prefixes or suffixes https://bugs.python.org/issue39939 opened by Dennis Sweeney #39940: Micro-optimizations to PySequence_Tuple() https://bugs.python.org/issue39940 opened by Marco Sulla #39941: multiprocessing: Process.join() should emit a warning if the p https://bugs.python.org/issue39941 opened by vstinner #39942: Making instance of `TypeVar` fails because of missing `__name_ https://bugs.python.org/issue39942 opened by jack1142 #39943: Meta: Clean up various issues in C internals https://bugs.python.org/issue39943 opened by petdance #39946: Is it time to remove _PyThreadState_GetFrame() hook? https://bugs.python.org/issue39946 opened by vstinner #39947: Make the PyThreadState structure opaque (move it to the intern https://bugs.python.org/issue39947 opened by vstinner #39948: Python 3.8 unconditionally uses functions not available on OS https://bugs.python.org/issue39948 opened by dgelessus #39949: truncating match in regular expression match objects repr https://bugs.python.org/issue39949 opened by Seth.Troisi #39950: Add pathlib.Path.hardlink_to() https://bugs.python.org/issue39950 opened by barneygale #39951: Ignore specific errors when closing ssl connections https://bugs.python.org/issue39951 opened by Dima.Tisnek #39952: Using VS2019 to automatically build Python3 and it failed to b https://bugs.python.org/issue39952 opened by Lin #39953: Let's update ssl error codes https://bugs.python.org/issue39953 opened by Dima.Tisnek #39954: test_subprocess: test_specific_shell() fails on AMD64 FreeBSD https://bugs.python.org/issue39954 opened by vstinner #39955: argparse print_help breaks when help is blank space https://bugs.python.org/issue39955 opened by Ying Zhang #39956: Numeric Literals vs string "1_1" on input int() or float() or https://bugs.python.org/issue39956 opened by zd nex Most recent 15 issues with no replies (15) ========================================== #39956: Numeric Literals vs string "1_1" on input int() or float() or https://bugs.python.org/issue39956 #39953: Let's update ssl error codes https://bugs.python.org/issue39953 #39950: Add pathlib.Path.hardlink_to() https://bugs.python.org/issue39950 #39948: Python 3.8 unconditionally uses functions not available on OS https://bugs.python.org/issue39948 #39946: Is it time to remove _PyThreadState_GetFrame() hook? https://bugs.python.org/issue39946 #39943: Meta: Clean up various issues in C internals https://bugs.python.org/issue39943 #39942: Making instance of `TypeVar` fails because of missing `__name_ https://bugs.python.org/issue39942 #39941: multiprocessing: Process.join() should emit a warning if the p https://bugs.python.org/issue39941 #39937: Suggest the usage of Element.iter() instead of iter() in whats https://bugs.python.org/issue39937 #39935: argparse: help parameter not documented in add_subparsers().ad https://bugs.python.org/issue39935 #39934: Fatal Python error "XXX block stack overflow" when exception s https://bugs.python.org/issue39934 #39919: C extension code reliant on static flags/behavior with PY_DEBU https://bugs.python.org/issue39919 #39917: new_compiler() called 2nd time causes error https://bugs.python.org/issue39917 #39914: logging.config: '.' (dot) as a key is not documented https://bugs.python.org/issue39914 #39912: warnings.py should not raise AssertionError when validating ar https://bugs.python.org/issue39912 Most recent 15 issues waiting for review (15) ============================================= #39950: Add pathlib.Path.hardlink_to() https://bugs.python.org/issue39950 #39947: Make the PyThreadState structure opaque (move it to the intern https://bugs.python.org/issue39947 #39943: Meta: Clean up various issues in C internals https://bugs.python.org/issue39943 #39939: Add str methods to remove prefixes or suffixes https://bugs.python.org/issue39939 #39915: await_args_list in AsyncMock always refers to the last awaited https://bugs.python.org/issue39915 #39912: warnings.py should not raise AssertionError when validating ar https://bugs.python.org/issue39912 #39908: Remove unused args from init_set_builtins_open and _Py_FatalEr https://bugs.python.org/issue39908 #39906: pathlib.Path: add `follow_symlinks` argument to `stat()` and ` https://bugs.python.org/issue39906 #39902: dis.Bytecode objects should be comparable https://bugs.python.org/issue39902 #39901: `pathlib.Path.owner()` and `group()` use `pwd` and `grp` modul https://bugs.python.org/issue39901 #39897: `pathlib.Path.is_mount()` calls `Path(self.parent)` and theref https://bugs.python.org/issue39897 #39895: `pathlib.Path.touch()` calls `os.close()` without using access https://bugs.python.org/issue39895 #39894: `pathlib.Path.samefile()` calls `os.stat()` without using acce https://bugs.python.org/issue39894 #39885: IDLE right click outside of any selection should clear it https://bugs.python.org/issue39885 #39882: Py_FatalError(): log automatically the function name https://bugs.python.org/issue39882 Top 10 most discussed issues (10) ================================= #39689: struct and memoryview tests rely on undefined behavior (as rev https://bugs.python.org/issue39689 17 msgs #39927: IDLE.app fails on macOS 10.15 if denied access to Documents https://bugs.python.org/issue39927 17 msgs #35370: Add _PyEval_SetTrace(tstate, func, arg) function https://bugs.python.org/issue35370 14 msgs #38500: PEP 523: Add private _PyInterpreterState_SetEvalFrameFunc() fu https://bugs.python.org/issue38500 14 msgs #39763: distutils.spawn should use subprocess (hang in parallel builds https://bugs.python.org/issue39763 14 msgs #39947: Make the PyThreadState structure opaque (move it to the intern https://bugs.python.org/issue39947 8 msgs #39885: IDLE right click outside of any selection should clear it https://bugs.python.org/issue39885 7 msgs #36144: Dictionary union. (PEP 584) https://bugs.python.org/issue36144 6 msgs #39824: Multi-phase extension module (PEP 489): don't call m_traverse, https://bugs.python.org/issue39824 6 msgs #14126: Speed up list comprehensions by preallocating the list where p https://bugs.python.org/issue14126 5 msgs Issues closed (73) ================== #16981: ImportError hides real error when there too many open files du https://bugs.python.org/issue16981 closed by brett.cannon #17231: Mark __del__ not being called in cycles as an impl detail https://bugs.python.org/issue17231 closed by brett.cannon #17296: Cannot unpickle classes derived from 'Exception' https://bugs.python.org/issue17296 closed by brett.cannon #17716: From ... import fails when parent package failed but child mod https://bugs.python.org/issue17716 closed by brett.cannon #18114: Update PyImport_ImportFrozenModuleObject() to set __package__ https://bugs.python.org/issue18114 closed by brett.cannon #18275: Make isinstance() work with super type instances https://bugs.python.org/issue18275 closed by brett.cannon #18831: importlib.import_module() bypasses builtins.__import__ https://bugs.python.org/issue18831 closed by brett.cannon #18834: Add Clang to distutils to build C/C++ extensions https://bugs.python.org/issue18834 closed by refi64 #19257: Sub-optimal error message when importing a non-package https://bugs.python.org/issue19257 closed by brett.cannon #19531: Loading -OO bytecode files if -O was requested can lead to pro https://bugs.python.org/issue19531 closed by brett.cannon #23592: SIGSEGV on interpreter shutdown, with daemon threads running w https://bugs.python.org/issue23592 closed by vstinner #24415: SIGINT always reset to SIG_DFL by Py_Finalize() https://bugs.python.org/issue24415 closed by vstinner #26037: Crash when reading sys.stdin.buffer in a daemon thread https://bugs.python.org/issue26037 closed by vstinner #27115: IDLE goto should use query.Query subclass https://bugs.python.org/issue27115 closed by terry.reedy #30519: [threading] Add daemon argument to Timer https://bugs.python.org/issue30519 closed by vstinner #34058: Default Python 3.7 install broken on openSUSE Leap 42.3: $PYTH https://bugs.python.org/issue34058 closed by vstinner #34822: Simplify AST for slices https://bugs.python.org/issue34822 closed by serhiy.storchaka #35775: Add a general selection function to statistics https://bugs.python.org/issue35775 closed by remi.lapeyre #36184: test_gdb.test_threads() is specific to _POSIX_THREADS, fail on https://bugs.python.org/issue36184 closed by vstinner #38080: 2to3 urllib fixer: missing fix for urllib.getproxies https://bugs.python.org/issue38080 closed by pablogsal #38249: Optimize out Py_UNREACHABLE in the release mode https://bugs.python.org/issue38249 closed by serhiy.storchaka #38643: Assertion failures when calling PyNumber_ToBase() with an inva https://bugs.python.org/issue38643 closed by serhiy.storchaka #38662: Decouple ensurepip from pip's internals using runpy https://bugs.python.org/issue38662 closed by vstinner #38818: Modify PyInterpreterState.eval_frame to pass tstate (PyThreadS https://bugs.python.org/issue38818 closed by vstinner #38894: Path.glob() sometimes misses files that match https://bugs.python.org/issue38894 closed by pablogsal #39127: _Py_HashPointer's void * argument should be const https://bugs.python.org/issue39127 closed by benjamin.peterson #39517: runpy calls open_code with Path object https://bugs.python.org/issue39517 closed by steve.dower #39577: venv --prompt argument is ignored https://bugs.python.org/issue39577 closed by vinay.sajip #39702: PEP 614: Relaxing Grammar Restrictions On Decorators https://bugs.python.org/issue39702 closed by brandtbucher #39761: Python 3.9.0a4 fails to build when configured with --with-dtra https://bugs.python.org/issue39761 closed by petr.viktorin #39822: Use NULL instead of None for empty attrib in C implementation https://bugs.python.org/issue39822 closed by serhiy.storchaka #39828: json.tool should catch BrokenPipeError https://bugs.python.org/issue39828 closed by vstinner #39844: IDLE 3.8.2 on MacOS 10.15.3 Launches to Black Windows https://bugs.python.org/issue39844 closed by ned.deily #39847: EnterNonRecursiveMutex on win32 can hang for 49.7 days: use Ge https://bugs.python.org/issue39847 closed by vstinner #39850: multiprocessing.connection.Listener fails to close with null b https://bugs.python.org/issue39850 closed by pablogsal #39852: IDLE: Goto should remove selection and update the status bar https://bugs.python.org/issue39852 closed by terry.reedy #39857: subprocess.run: add an extra_env kwarg to complement existing https://bugs.python.org/issue39857 closed by gregory.p.smith #39861: French doc __futur__: Bad URL https://bugs.python.org/issue39861 closed by SilentGhost #39869: Improve Instance Objects tutorial documentation https://bugs.python.org/issue39869 closed by Mariatta #39875: urllib.request.urlopen sends POST data as query string https://bugs.python.org/issue39875 closed by henrik242 #39877: Daemon thread is crashing in PyEval_RestoreThread() while the https://bugs.python.org/issue39877 closed by vstinner #39878: Remove unused args in Python/formatter_unicode.c https://bugs.python.org/issue39878 closed by benjamin.peterson #39880: string.lstrip() with leading '3's https://bugs.python.org/issue39880 closed by steven.daprano #39884: "SystemError: bad call flags" exceptions added as part of BPO- https://bugs.python.org/issue39884 closed by vstinner #39886: Remove unused arg in config_get_stdio_errors in Python/initcon https://bugs.python.org/issue39886 closed by benjamin.peterson #39888: modules not install https://bugs.python.org/issue39888 closed by eric.smith #39889: Fix ast.unparse() for subscription by extended slices and tupl https://bugs.python.org/issue39889 closed by serhiy.storchaka #39890: The AST is mangled when compiling starred assignments https://bugs.python.org/issue39890 closed by pablogsal #39893: Add set_terminate() to logging https://bugs.python.org/issue39893 closed by vinay.sajip #39896: Const args and remove unused args in Python/compile.c https://bugs.python.org/issue39896 closed by petdance #39898: Remove unused arg from append_formattedvalue in Python/ast_unp https://bugs.python.org/issue39898 closed by benjamin.peterson #39899: `pathlib.Path.expanduser()` does not call `os.path.expanduser( https://bugs.python.org/issue39899 closed by serhiy.storchaka #39900: `pathlib.Path.__bytes__()` calls `os.fsencode()` without using https://bugs.python.org/issue39900 closed by barneygale #39903: Double decref in _elementtree.Element.__getstate__ https://bugs.python.org/issue39903 closed by serhiy.storchaka #39904: Move handling of one-argument call of type() from type.__new__ https://bugs.python.org/issue39904 closed by serhiy.storchaka #39905: Cannot load sub package having a 3-dot relative import https://bugs.python.org/issue39905 closed by mark.dickinson #39907: `pathlib.Path.iterdir()` wastes memory by using `os.listdir()` https://bugs.python.org/issue39907 closed by barneygale #39909: Assignment expression in assert causes SyntaxError https://bugs.python.org/issue39909 closed by eric.smith #39911: "AMD64 Windows7 SP1 3.x" buildbot doesn't build anymore https://bugs.python.org/issue39911 closed by vstinner #39916: More reliable use of scandir in Path.glob() https://bugs.python.org/issue39916 closed by serhiy.storchaka #39918: random.Random(False) weird error https://bugs.python.org/issue39918 closed by vstinner #39921: json module install error i was use windows 10 pro 64 bit, pls https://bugs.python.org/issue39921 closed by serhiy.storchaka #39922: Remove unused args in Python/compile.c https://bugs.python.org/issue39922 closed by benjamin.peterson #39923: Command errored out with exit status 1: while jsonlib https://bugs.python.org/issue39923 closed by serhiy.storchaka #39925: `pathlib.Path.link_to()` has the wrong argument order https://bugs.python.org/issue39925 closed by eric.smith #39926: unicodedata for Unicode 13.0.0 https://bugs.python.org/issue39926 closed by benjamin.peterson #39928: Pysftp Issue File Upload is not working - put command https://bugs.python.org/issue39928 closed by eric.smith #39930: Embedded installer for Python 3.7.7 missing vcruntime140.dll https://bugs.python.org/issue39930 closed by steve.dower #39936: Python fails to build _asyncio on module on AIX https://bugs.python.org/issue39936 closed by vstinner #39938: RotatingFileHandler does not support any mode other than 'a'. https://bugs.python.org/issue39938 closed by vinay.sajip #39944: UserString.join should return UserString https://bugs.python.org/issue39944 closed by serhiy.storchaka #39945: Wrong example result in docs https://bugs.python.org/issue39945 closed by hook #1294959: Add sys.platlibdir to use /usr/lib64 on Fedora and SuSE https://bugs.python.org/issue1294959 closed by vstinner

1 0

Last call for comments on PEP 573 (Module State Access from C Extension Methods)
by Stefan Behnel 11 Mar '20

11 Mar '20

Hi all, I think that PEP 573 is ready to be accepted, to greatly improve the state of extension modules in CPython 3.9. https://www.python.org/dev/peps/pep-0573/ It has come a long way since the original proposal and went through several iterations and discussions by various interested people, effectively reducing its scope quite a bit. So this is the last call for comments on the latest version of the PEP, before I will pronounce on it. Please keep the discussion in this thread. Stefan

3 7

Stalemate on bringing back PEP 523 support into Python 3.8
by Brett Cannon 10 Mar '20

10 Mar '20

An unfortunate side-effect of making PyInterpreterState in Python 3.8 opaque is it removed [PEP 523](https://www.python.org/dev/peps/pep-0523/) support. https://www.python.org/dev/peps/pep-0523/ was opened to try and fix this, but there seems to be a stalemate in the issue. A key question is at what API level should setting the frame evaluation function live at? No one is suggesting the stable ABI, but there isn't agreement between CPython or the internal API (there's also seems to be a suggestion to potentially remove PEP 523 support entirely). And regardless of either, there also seems to be a disagreement about providing getters and setters to continue to try and hide PyInterpreterState regardless of which API level support is provided at (if any). If you have an opinion please weight in on the issue.

7 9

[RELEASE] Python 3.7.7 is now available
by Ned Deily 10 Mar '20

10 Mar '20

https://discuss.python.org/t/python-3-7-7-is-now-available/3682 https://www.python.org/downloads/release/python-377/ -- Ned Deily nad(a)python.org -- []

1 0

Request to postpone some Python 3.9 incompatible changes to Python 3.10
by Victor Stinner 07 Mar '20

07 Mar '20

Hi, Python 3.9 introduces many small incompatible changes which broke tons of Python projects, including popular projects, some of them being unmaintained but still widely used (like nose, last release in 2015). Miro and me consider that Python 3.9 is pushing too much pressure on projects maintainers to either abandon Python 2.7 right now (need to update the CI, the documentation, warn users, etc.), or to introduce a *new* compatibility layer to support Python 3.9: layer which would be dropped as soon as Python 2.7 support will be dropped (soon-ish). Python 3.9 is too early to accumulate so many incompatible changes on purpose, some incompatible changes like the removal of collections aliases to ABC should be reverted, and reapplied on Python 3.10. Python 3.9 would be the last release which still contain compatibility layers for Python 2.7. Said differently, we request to maintain the small compatibility layer in Python for one more cycle, instead of requesting every single project maintainer to maintain it on their side. We consider that the general maintenance burden is lower if it's kept in Python for now. == Fedora COPR notify packages broken by Python 3.9 == In Python 3.9, Victor introduced tons of incompatible changes at the beginning of the devcycle. His plan was to push as many as possible, and later decide what to do... This time has come :-) He wrote PEP 606 "Python Compatibility Version" and we wrote PEP 608 "Coordinated Python release", but both have been rejected. At least, it seems like most people agreed that having a CI to get notified of broken projects should help. We are updating the future Fedora 33 to replace Python 3.8 with Python 3.9. We are using a tool called "COPR" which is like a sandbox and can be seen as the CI discussed previously. It rebuilds Fedora using Python 3.9 as /usr/bin/python3 (and /usr/bin/python !). We now have a good overview of broken packages and which incompatible changes broke most packages. https://fedoraproject.org/wiki/Changes/Python3.9 - Describes the Fedora change. https://copr.fedorainfracloud.org/coprs/g/python/python3.9/monitor/ - Has package failures. Some packages fail because of broken dependencies. https://bugzilla.redhat.com/showdependencytree.cgi?id=PYTHON39 - Has open Python 3.9 bug reports for Fedora packages. Some problems have been fixed upstream already before reaching Fedora, most are only fixed when the Fedora maintainers report the problems back to upstream maintainers. Right now, there are 150+ packages broken by Python 3.9 incompatible changes. == Maintenance burden == Many Python projects have not yet removed Python 2 support and Python 2 CI. It's not that they would be in the "we will not drop Python 2 support ever" camp, it's just that they have not done it yet. Removing Python 2 compatibility code from the codebase and removing it from the documentation and metadata and CI is a boring task, doesn't bring anything to users, and it might take a new major release of the library. At this point, we are very early in 2020 to expect most projects to have already done this. At the same time, we would like them to support Python 3.9 as soon in the release cycle as possible. By removing Python 2 compatibility layers from the 3.9 standard library, we are forcing the projects maintainers to re-invent their own compatibility layers and copy-paste stuff like this around. Example: try: from collections.abc import Sequence except ImprotError: # Python 2.7 doesn't have collections.abc from collections import Sequence While if we remove collections.Sequence in 3.10, they will face this decision early in 2021 and they will simply fix their code by adding ".abc" at the proper places, not needing any more compatibility layers. Of course, there will be projects that will still have declared Python 2 support in 2021, but it will arguably not be that many. While it's certainly tempting to have "more pure" code in the standard library, maintaining the compatibility shims for one more release isn't really that big of a maintenance burden, especially when comparing with dozens (hundreds?) of third party libraries essentially maintaining their own. An good example of a broken package is the nose project which is no longer maintained (according to their website): the last release was in 2015. It remains a very popular test runner. According to libraries.io, it has with 3 million downloads per month, 41.7K dependent repositories and 325 dependent packages. We patched nose in Fedora to fix Python 3.5, 3.6, 3.8 and now 3.9 compatibility issues. People installing nose from PyPI with "pip install" get the unmaintained flavor which is currently completely broken on Python 3.9. Someone should take over the nose project and maintain it again, or every single project using nose should pick another tool (unittest, nose2, pytest, whatever else). Both options will take a lot of time. == Request to revert some incompatible changes == See https://docs.python.org/dev/whatsnew/3.9.html#removed Incompatible changes which require "if <python3>: (...) else: (...)" or "try: <python3 code> except (...): <python2 code>": * Removed tostring/fromstring methods in array.array and base64 modules * Removed collections aliases to ABC classes * Removed fractions.gcd() function (which is similar to math.gcd()) * Remove "U" mode of open(): having to use io.open() just for Python 2 makes the code uglier * Removed old plistlib API: 2.7 doesn't have the new API == Kept incompatible changes == Ok-ish incompatible changes (mostly only affects compatiblity libraries like six): * _dummy_thread and dummy_threading modules removed: broke six, nine and future projects. six and nine are already fixed for 3.9. OK incompatible changes (can be replaced by the same code on 2.7 and 3.9): * isAlive() method of threading.Thread has been removed: Thread.is_alive() method is available in 2.7 and 3.9 * xml.etree.ElementTree.getchildren() and xml.etree.ElementTree.getiterator() methods are removed from 3.9, but list()/iter() works in 2.7 and 3.9 == Call to check for DeprecationWarning in your own projects == You must pay attention to DeprecationWarning in Python 3.9: it will be the last "compatibility layer" release, incompatible changes will be reapplied to Python 3.10. For example, you can use the development mode to see DeprecationWarning and ResourceWarning: use the "-X dev" command line option or set the PYTHONDEVMODE=1 environment variable. Or you can use the PYTHONWARNINGS=default environment variable to see DeprecationWarning. You might even want to treat all warnings as errors to ensure that you don't miss any when you run your test suite in your CI. You can use PYTHONWARNINGS=error, and combine it with PYTHONDEVMODE=1. Warnings filters can be used to ignore warnings in third party code, see the documentation: https://docs.python.org/dev/library/warnings.html#the-warnings-filter -- Victor Stinner and Miro Hrončok for Fedora

29 65

Summary of Python tracker Issues
by Python tracker 06 Mar '20

06 Mar '20

ACTIVITY SUMMARY (2020-02-28 - 2020-03-06) 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 7359 (+26) closed 44270 (+68) total 51629 (+94) Open issues with patches: 2882 Issues opened (67) ================== #39389: gzip metadata fails to reflect compresslevel https://bugs.python.org/issue39389 reopened by ned.deily #39757: EmailMessage bad encoding for international domain https://bugs.python.org/issue39757 reopened by r.david.murray #39787: test_ssl and test_urllib2_localnet failing with new OpenSSL https://bugs.python.org/issue39787 opened by mscastanho #39790: LICENSE.TXT file does not contain all incorporated software https://bugs.python.org/issue39790 opened by steve.dower #39791: New `files()` api from importlib_resources. https://bugs.python.org/issue39791 opened by jaraco #39792: Two Ctrl+C is required to terminate when a pipe is blocking https://bugs.python.org/issue39792 opened by msakai #39793: make_msgid fail on FreeBSD 12.1-RELEASE-p1 with different doma https://bugs.python.org/issue39793 opened by BTaskaya #39794: Add --without-decimal-contextvar option to use just threads in https://bugs.python.org/issue39794 opened by skrah #39795: multiprocessing creates duplicates of .pyc files https://bugs.python.org/issue39795 opened by ivb #39797: shutdown() in socketserver.BaseServer should be in a different https://bugs.python.org/issue39797 opened by amaajemyfren #39798: Update and Improve README.AIX https://bugs.python.org/issue39798 opened by BTaskaya #39799: Never return base's fragment from urljoin (urllib.parse) https://bugs.python.org/issue39799 opened by op368 #39800: Inconsistent/incomplete disassembly of methods vs method sourc https://bugs.python.org/issue39800 opened by smurthy #39801: list.insert is slow, likely due to manual memmove https://bugs.python.org/issue39801 opened by Stefan Pochmann #39804: timezone constants in time module inaccurate with negative DST https://bugs.python.org/issue39804 opened by p-ganssle #39805: Copying functions doesn't actually copy them https://bugs.python.org/issue39805 opened by steven.daprano #39810: Generic script for finding bugs in get_source_segment https://bugs.python.org/issue39810 opened by alexmojaki #39812: Avoid daemon threads in concurrent.futures https://bugs.python.org/issue39812 opened by pitrou #39813: test_ioctl skipped -- Unable to open /dev/tty https://bugs.python.org/issue39813 opened by Marco Sulla #39814: Hyphens not generated for split-words in a "note" directive https://bugs.python.org/issue39814 opened by rhettinger #39816: More descriptive error message than "too many values to unpack https://bugs.python.org/issue39816 opened by alexmojaki #39817: CRITICAL: TypeError: cannot pickle 'generator' https://bugs.python.org/issue39817 opened by dotoscat #39819: NULL pointer crash in Modules/_cursesmodule.c in PyInit__curse https://bugs.python.org/issue39819 opened by kumba #39820: Bracketed paste mode for REPL https://bugs.python.org/issue39820 opened by Marco Sulla #39821: grp library functions grp.getgrnam() & grp.getgrgid() returnin https://bugs.python.org/issue39821 opened by abhi.sharma #39822: Use NULL instead of None for empty attrib in C implementation https://bugs.python.org/issue39822 opened by serhiy.storchaka #39823: Disassembly - improve documentation for bytecode instruction c https://bugs.python.org/issue39823 opened by smurthy #39824: Multi-phase extension module (PEP 489): don't call m_traverse, https://bugs.python.org/issue39824 opened by vstinner #39825: EXT_SUFFIX inconsistent between sysconfig and distutils.syscon https://bugs.python.org/issue39825 opened by pitrou #39827: setting a locale that uses comma as decimal separator breaks t https://bugs.python.org/issue39827 opened by thawn #39828: json.tool should catch BrokenPipeError https://bugs.python.org/issue39828 opened by vstinner #39829: __len__ called twice in the list() constructor https://bugs.python.org/issue39829 opened by kimiguel #39830: zipfile.Path is not included in __all__ https://bugs.python.org/issue39830 opened by xtreak #39831: Reference leak in PyErr_WarnEx() https://bugs.python.org/issue39831 opened by serhiy.storchaka #39832: Modules with decomposable characters in module name not found https://bugs.python.org/issue39832 opened by Norbert #39835: Implement PyObject_CopyToObject https://bugs.python.org/issue39835 opened by nanjekyejoannah #39836: Implement PyObject_GetMemoryView https://bugs.python.org/issue39836 opened by nanjekyejoannah #39837: Remove Azure Pipelines from GitHub PRs https://bugs.python.org/issue39837 opened by vstinner #39838: Possible unnecessary redifinition of _POSIX_C_SOURCE https://bugs.python.org/issue39838 opened by nanjekyejoannah #39839: Non-working error handler when creating a task with assigning https://bugs.python.org/issue39839 opened by rshakh #39842: partial_format() https://bugs.python.org/issue39842 opened by Marco Sulla #39843: Merged fix for bpo-17560 missing from changelog https://bugs.python.org/issue39843 opened by Mikko Nylén #39844: IDLE 3.8.2 on MacOS 10.15.3 Launches to Black Windows https://bugs.python.org/issue39844 opened by Jacin Ferreira #39845: Argparse on Python 3.7.1 (Windows) appends double quotes to st https://bugs.python.org/issue39845 opened by 888xray999 #39846: Register .whl as a unpack format in shutil unpack https://bugs.python.org/issue39846 opened by dchimeno #39847: EnterNonRecursiveMutex on win32 can hang for 49.7 days: use Ge https://bugs.python.org/issue39847 opened by aclover #39849: Compiler warninig: warning: variable ‘res’ set but not use https://bugs.python.org/issue39849 opened by corona10 #39850: multiprocessing.connection.Listener fails to close with null b https://bugs.python.org/issue39850 opened by nmichaels #39851: tarfile: Exception ignored in (... stdout ...) BrokenPipeError https://bugs.python.org/issue39851 opened by vstinner #39852: IDLE: Goto should remove selection and update the status bar https://bugs.python.org/issue39852 opened by Dave Liptack #39853: Segmentation fault with urllib.request.urlopen and threads https://bugs.python.org/issue39853 opened by Anne Archibald #39854: f-strings with format specifiers have wrong col_offset https://bugs.python.org/issue39854 opened by asmeurer #39856: glob : some 'unix style' glob items are not supported https://bugs.python.org/issue39856 opened by Je GeVa #39857: subprocess.run: add an extra_env kwarg to complement existing https://bugs.python.org/issue39857 opened by vapier #39858: bitfield layout wrong in ctypes https://bugs.python.org/issue39858 opened by thesamprice #39860: configparser - no support for cascading defaults (as defined b https://bugs.python.org/issue39860 opened by Ben Griffin #39861: French doc __futur__: Bad URL https://bugs.python.org/issue39861 opened by Narann #39862: Why are the union relationships not implemented by default for https://bugs.python.org/issue39862 opened by maggyero #39863: Add trimend option to readline() and readlines() https://bugs.python.org/issue39863 opened by inada.naoki #39865: getattr silences an unrelated AttributeError https://bugs.python.org/issue39865 opened by pasenor #39868: Stale Python Language Reference docs (no walrus). https://bugs.python.org/issue39868 opened by brandtbucher #39869: Improve Instance Objects tutorial documentation https://bugs.python.org/issue39869 opened by Mariatta #39871: math.copysign raises SystemError with non-float x and custom y https://bugs.python.org/issue39871 opened by auscompgeek #39873: Debug mode: check if objects are valid https://bugs.python.org/issue39873 opened by vstinner #39875: urllib.request.urlopen sends POST data as query string https://bugs.python.org/issue39875 opened by henrik242 #39877: Daemon thread is crashing in PyEval_RestoreThread() while the https://bugs.python.org/issue39877 opened by vstinner #39878: Remove unused args in Python/formatter_unicode.c https://bugs.python.org/issue39878 opened by petdance Most recent 15 issues with no replies (15) ========================================== #39878: Remove unused args in Python/formatter_unicode.c https://bugs.python.org/issue39878 #39869: Improve Instance Objects tutorial documentation https://bugs.python.org/issue39869 #39865: getattr silences an unrelated AttributeError https://bugs.python.org/issue39865 #39857: subprocess.run: add an extra_env kwarg to complement existing https://bugs.python.org/issue39857 #39853: Segmentation fault with urllib.request.urlopen and threads https://bugs.python.org/issue39853 #39850: multiprocessing.connection.Listener fails to close with null b https://bugs.python.org/issue39850 #39849: Compiler warninig: warning: variable ‘res’ set but not use https://bugs.python.org/issue39849 #39846: Register .whl as a unpack format in shutil unpack https://bugs.python.org/issue39846 #39838: Possible unnecessary redifinition of _POSIX_C_SOURCE https://bugs.python.org/issue39838 #39836: Implement PyObject_GetMemoryView https://bugs.python.org/issue39836 #39835: Implement PyObject_CopyToObject https://bugs.python.org/issue39835 #39832: Modules with decomposable characters in module name not found https://bugs.python.org/issue39832 #39830: zipfile.Path is not included in __all__ https://bugs.python.org/issue39830 #39825: EXT_SUFFIX inconsistent between sysconfig and distutils.syscon https://bugs.python.org/issue39825 #39822: Use NULL instead of None for empty attrib in C implementation https://bugs.python.org/issue39822 Most recent 15 issues waiting for review (15) ============================================= #39878: Remove unused args in Python/formatter_unicode.c https://bugs.python.org/issue39878 #39877: Daemon thread is crashing in PyEval_RestoreThread() while the https://bugs.python.org/issue39877 #39873: Debug mode: check if objects are valid https://bugs.python.org/issue39873 #39871: math.copysign raises SystemError with non-float x and custom y https://bugs.python.org/issue39871 #39868: Stale Python Language Reference docs (no walrus). https://bugs.python.org/issue39868 #39860: configparser - no support for cascading defaults (as defined b https://bugs.python.org/issue39860 #39852: IDLE: Goto should remove selection and update the status bar https://bugs.python.org/issue39852 #39847: EnterNonRecursiveMutex on win32 can hang for 49.7 days: use Ge https://bugs.python.org/issue39847 #39837: Remove Azure Pipelines from GitHub PRs https://bugs.python.org/issue39837 #39831: Reference leak in PyErr_WarnEx() https://bugs.python.org/issue39831 #39828: json.tool should catch BrokenPipeError https://bugs.python.org/issue39828 #39824: Multi-phase extension module (PEP 489): don't call m_traverse, https://bugs.python.org/issue39824 #39822: Use NULL instead of None for empty attrib in C implementation https://bugs.python.org/issue39822 #39799: Never return base's fragment from urljoin (urllib.parse) https://bugs.python.org/issue39799 #39794: Add --without-decimal-contextvar option to use just threads in https://bugs.python.org/issue39794 Top 10 most discussed issues (10) ================================= #39837: Remove Azure Pipelines from GitHub PRs https://bugs.python.org/issue39837 14 msgs #39682: pathlib.Path objects can be used as context managers https://bugs.python.org/issue39682 11 msgs #39697: Failed to build with --with-cxx-main=g++-9.2.0 https://bugs.python.org/issue39697 11 msgs #39778: collections.OrderedDict and weakref.ref raises "refcount is to https://bugs.python.org/issue39778 11 msgs #39844: IDLE 3.8.2 on MacOS 10.15.3 Launches to Black Windows https://bugs.python.org/issue39844 11 msgs #39868: Stale Python Language Reference docs (no walrus). https://bugs.python.org/issue39868 11 msgs #39794: Add --without-decimal-contextvar option to use just threads in https://bugs.python.org/issue39794 10 msgs #39831: Reference leak in PyErr_WarnEx() https://bugs.python.org/issue39831 10 msgs #39763: distutils.spawn should use subprocess (hang in parallel builds https://bugs.python.org/issue39763 9 msgs #39801: list.insert is slow, likely due to manual memmove https://bugs.python.org/issue39801 9 msgs Issues closed (64) ================== #27743: Python 2 has a wrong artificial limit on the amount of memory https://bugs.python.org/issue27743 closed by serhiy.storchaka #34274: Python launcher behavior with "#!/usr/bin/env python" shebang https://bugs.python.org/issue34274 closed by steve.dower #35632: support unparse for Suite ast https://bugs.python.org/issue35632 closed by BTaskaya #35712: Make NotImplemented unusable in boolean context https://bugs.python.org/issue35712 closed by serhiy.storchaka #35912: _testembed.c fails to compile when using --with-cxx-main in th https://bugs.python.org/issue35912 closed by vstinner #36490: Modernize function signature in Archiving section of shutil d https://bugs.python.org/issue36490 closed by CAM-Gerlach #37534: In minidom module ability to add Standalone Document Declaraio https://bugs.python.org/issue37534 closed by scoder #38380: Update SQLite to 3.31.1 in Windows and macOS installer builds https://bugs.python.org/issue38380 closed by benjamin.peterson #38641: lib2to3 does not support py38 return/yield syntax with starred https://bugs.python.org/issue38641 closed by pablogsal #38913: Py_BuildValue("(s#O)", ...) segfaults if entered with exceptio https://bugs.python.org/issue38913 closed by serhiy.storchaka #38971: codecs.open leaks file descriptor when invalid encoding is pas https://bugs.python.org/issue38971 closed by serhiy.storchaka #39020: [AIX] module _curses fails to build since ESCDELAY has been ad https://bugs.python.org/issue39020 closed by Michael.Felt #39050: The "Help" button in IDLE's config dialog does not work https://bugs.python.org/issue39050 closed by terry.reedy #39088: test_concurrent_futures crashed with python.core core dump on https://bugs.python.org/issue39088 closed by vstinner #39378: partial of PickleState struct should be traversed. https://bugs.python.org/issue39378 closed by serhiy.storchaka #39379: sys.path[0] is already absolute path https://bugs.python.org/issue39379 closed by vstinner #39495: xml.etree.ElementTree.TreeBuilder.start differs between pure P https://bugs.python.org/issue39495 closed by serhiy.storchaka #39520: AST Unparser can't unparse ext slices correctly https://bugs.python.org/issue39520 closed by BTaskaya #39530: Documentation about comparisons between numeric types is misle https://bugs.python.org/issue39530 closed by mark.dickinson #39546: argparse: allow_abbrev=False is ignored for alternative prefix https://bugs.python.org/issue39546 closed by petr.viktorin #39548: Request fails when 'WWW-Authenticate' header for Digest Authen https://bugs.python.org/issue39548 closed by orsenthil #39599: ABI breakage between Python 3.7.4 and 3.7.5: change in PyGC_He https://bugs.python.org/issue39599 closed by vstinner #39639: Remove Suite node from AST https://bugs.python.org/issue39639 closed by pablogsal #39678: RFC improve readability of _queue_management_worker for Proces https://bugs.python.org/issue39678 closed by pitrou #39704: Disable code coverage https://bugs.python.org/issue39704 closed by vstinner #39718: TYPE_IGNORE, COLONEQUAL missing from py38 changes in token doc https://bugs.python.org/issue39718 closed by terry.reedy #39764: PyAsyncGenObject causes task.get_stack() raising AttributeErro https://bugs.python.org/issue39764 closed by asvetlov #39769: compileall.compile_dir(..., ddir="<prefix>") omits the interme https://bugs.python.org/issue39769 closed by gregory.p.smith #39770: Remove unnecessary size calculation in array_modexec in Module https://bugs.python.org/issue39770 closed by vstinner #39772: Python 2 FAQ shown in help(a)python.org auto reply https://bugs.python.org/issue39772 closed by terry.reedy #39773: Export symbols for vectorcall https://bugs.python.org/issue39773 closed by David Hewitt #39775: inspect.Signature.parameters should be an OrderedDict, not a p https://bugs.python.org/issue39775 closed by inada.naoki #39781: IDLE: Do not jump when select in codecontext https://bugs.python.org/issue39781 closed by terry.reedy #39782: local varible referenced a Exception won't be collected in fun https://bugs.python.org/issue39782 closed by terry.reedy #39784: Tuple comprehension https://bugs.python.org/issue39784 closed by steven.daprano #39785: #!/usr/bin/python shebang doesn't use default python (3) on Wi https://bugs.python.org/issue39785 closed by steve.dower #39786: Have the heaps library support max heap https://bugs.python.org/issue39786 closed by rhettinger #39788: Exponential notation should return an int if it can https://bugs.python.org/issue39788 closed by zach.ware #39789: Update Windows release build machines to latest versions https://bugs.python.org/issue39789 closed by steve.dower #39796: warning extension module inited twice in python3.9 https://bugs.python.org/issue39796 closed by vstinner #39802: Ensure {get,set}_escdelay and {get,set}_tabsize only implement https://bugs.python.org/issue39802 closed by pablogsal #39803: _PyLong_FormatAdvancedWriter has an unnecessary str https://bugs.python.org/issue39803 closed by benjamin.peterson #39806: different behavior between __ior__ and __or__ in dict made by https://bugs.python.org/issue39806 closed by gvanrossum #39807: Python38 installed in wrong directory on Windows https://bugs.python.org/issue39807 closed by zach.ware #39808: pathlib: reword docs for stat() https://bugs.python.org/issue39808 closed by brett.cannon #39809: argparse: add max_text_width parameter to ArgumentParser https://bugs.python.org/issue39809 closed by rhettinger #39811: Curses crash on ^4 https://bugs.python.org/issue39811 closed by serhiy.storchaka #39815: functools.cached_property() not included in __all__ https://bugs.python.org/issue39815 closed by pablogsal #39818: Declaring local variable invalidates access to a global variab https://bugs.python.org/issue39818 closed by eric.smith #39826: logging HTTPHandler does not support proxy https://bugs.python.org/issue39826 closed by vinay.sajip #39833: Bug in html parsing module triggered by malformed input https://bugs.python.org/issue39833 closed by ezio.melotti #39834: + vs. % operator precedence not correct https://bugs.python.org/issue39834 closed by ergun #39840: FileNotFoundError et al show b-prefix on filepaths if passed a https://bugs.python.org/issue39840 closed by eric.smith #39841: "as" variable in except block deletes local variables with sam https://bugs.python.org/issue39841 closed by eric.smith #39848: Warning: 'classifiers' should be a list, got type 'tuple' https://bugs.python.org/issue39848 closed by Marco Sulla #39855: test.test_subprocess.POSIXProcessTestCase.test_user fails in t https://bugs.python.org/issue39855 closed by vstinner #39859: set_herror should not throw away constness of hstrerror https://bugs.python.org/issue39859 closed by miss-islington #39864: IndexError gives wrong axis info https://bugs.python.org/issue39864 closed by steven.daprano #39866: get_type_hints raises inconsistent TypeError https://bugs.python.org/issue39866 closed by gvanrossum #39867: randrange(N) for N's in same dyadic blocs have excessive corre https://bugs.python.org/issue39867 closed by rhettinger #39870: sys_displayhook_unencodable takes an unnecessary PyThreadState https://bugs.python.org/issue39870 closed by benjamin.peterson #39872: Remove unused args from two functions in Python/symtable.c https://bugs.python.org/issue39872 closed by benjamin.peterson #39874: Heappush of Maxheap version does not exist https://bugs.python.org/issue39874 closed by rhettinger #39876: csv.DictReader.fieldnames interprets unicode as ascii https://bugs.python.org/issue39876 closed by serhiy.storchaka

1 0

PEP 614 accepted
by Barry Warsaw 05 Mar '20

05 Mar '20

By unanimous consent, the Python Steering Council unanimously accepts PEP 614 — Relaxing Grammar Restrictions On Decorators. Congratulations to PEP author Brandt and PEP sponsor Guido, and thanks to everyone who’s worked on this PEP and its implementation. Cheers, -Barry

8 9

Re: [RELEASE] Python 3.7.7rc1 is now available for testing
by Ned Deily 04 Mar '20

04 Mar '20

On Mar 4, 2020, at 23:39, Jonathan Goble <jcgoble3(a)gmail.com> wrote: >> On Wed, Mar 4, 2020 at 10:05 PM Ned Deily <nad(a)python.org> wrote: >> On Mar 4, 2020, at 17:17, Jonathan Goble <jcgoble3(a)gmail.com> wrote: >> > On Wed, Mar 4, 2020 at 1:02 PM Ned Deily <nad(a)python.org> wrote: >> > Details here: >> >> https://discuss.python.org/t/python-3-7-7rc1-is-now-available-for-testing/3… >> >> "Assuming no critical problems are found prior to 2020-02-10..." >> > I would like to know how you expect people to travel back in time to report problems. :P >> >> python3.7 -m pip install guidos_time_machine >> >> If, for some reason that doesn't work, let's wait until 2020-03-10! > > Well, it works now! (if you substitute dashes for the underscores) > > https://pypi.org/project/guidos-time-machine/ > > Brand new package uploaded by Guido 36 minutes ago. Python is great for just-in-time agile development, especially in future tenths. -- Ned Deily nad(a)python.org -- []

1 0

Re: [RELEASE] Python 3.7.7rc1 is now available for testing
by Ned Deily 04 Mar '20

04 Mar '20

On Mar 4, 2020, at 17:17, Jonathan Goble <jcgoble3(a)gmail.com> wrote: > On Wed, Mar 4, 2020 at 1:02 PM Ned Deily <nad(a)python.org> wrote: > Details here: > >> https://discuss.python.org/t/python-3-7-7rc1-is-now-available-for-testing/3… >> >> "Assuming no critical problems are found prior to 2020-02-10..." > I would like to know how you expect people to travel back in time to report problems. :P python3.7 -m pip install guidos_time_machine If, for some reason that doesn't work, let's wait until 2020-03-10! -- Ned Deily nad(a)python.org -- []

1 0