Mailman 3 June 2019 - Python-Dev

Documenting METH_FASTCALL
by Jeroen Demeyer June 13, 2019

June 13, 2019

Hello, has the time come to document METH_FASTCALL? This was introduced in Python 3.6 for positional arguments only and extended in Python 3.7 to support also keyword arguments. No changes have been made since then. The vectorcall protocol (PEP 590) uses a calling convention based on METH_FASTCALL, so I expect METH_FASTCALL to stay as it is. PEP 590 also means that CPython is now even more than before optimized for METH_FASTCALL instead of METH_VARARGS. Whether or not METH_FASTCALL should be added to the limited API is another question. I'm only talking about adding it to the documentation. Jeroen.

2 2

Parser module in the stdlib
by Pablo Galindo Salgado June 13, 2019

June 13, 2019

Hi everyone, TLDR ===== I propose to remove the current parser module and expose pgen2 as a standard library module. Some context =========== The parser module has been "deprecated" (technically we recommend to prefer the ast module instead) since Python2.5 but is still in the standard library. Is a 1222-line C module that needs to be kept in sync with the grammar and the Python parser sometimes by hand. It has also been broken for several years: I recently fixed a bug that was introduced in Python 3.5 that caused the parse module to not being able to parse if-else blocks ( https://bugs.python.org/issue36256). The interface it provides is a very raw view of the CST. For instance: >>> parser.sequence2st(parser.suite("def f(x,y,z): pass").totuple()) provides an object with methods compile, isexpr, issuite, tolist, totuple. The last two produce containers with the numerical values of the grammar elements (tokens, dfas...etc) >>> parser.suite("def f(x,y,z): pass").tolist() [257, [269, [295, [263, [1, 'def'], [1, 'f'], [264, [7, '('], [265, [266, [1, 'x']], [12, ','], [266, [1, 'y']], [12, ','], [266, [1, 'z']]], [8, ')']], [11, ':'], [304, [270, [271, [277, [1, 'pass']]], [4, '']]]]]], [4, ''], [0, '']] This is a very raw interface and is very tied to the particularities of CPython without almost any abstraction. On the other hand, there is a Python implementation of the Python parser and parser generator in lib2to3 (pgen2). This module is not documented and is usually considered an implementation detail of lib2to3 but is extremely useful. Several 3rd party packages (black, fissix...) are using it directly or have their own forks due to the fact that it can get outdated with respect to the Python3 grammar as it was originally used only for Python2 to Python3 migration. It has the ability to consume LL1 grammars in EBNF form and produces an LL1 parser for them (by creating parser tables that the same module can consume). Many people use the module currently to support or parse supersets of Python (like Python2/3 compatible grammars, cython-like changes...etc). Proposition ======== I propose to remove finally the parser module as it has been "deprecated" for a long time, is almost clear that nobody uses it and has very limited usability and replace it (maybe with a different name) with pgen2 (maybe with a more generic interface that is detached to lib2to3 particularities). This will not only help a lot current libraries that are using forks or similar solutions but also will help to keep synchronized the shipped grammar (that is able to parse Python2 and Python3 code) with the current Python one (as now will be more justified to keep them in sync). What do people think about? Do you have any concerns? Do you think is a good/bad idea? Regards from sunny London, Pablo Galindo

9 15

Using Generic Type Constructors at Runtime
by Saul Shanabrook June 12, 2019

June 12, 2019

Hello all, I am working on an expression and replacement system in Python and am trying to figure out if constructors for generic classes should be done with classmethods or with functions. I have laid out an example using each in a Github issue (https://github.com/Quansight-Labs/metadsl/issues/69#issuecomment-500898932) and wanted to open the issue up the larger community because I am unsure if there is an established pattern here yet. A minimal example showing the difference is `none(int)` vs `Optional[int].none()`. (Note Optional here is not typing.Optional, but my own class). This has implications for the language, because if we want to support Optional[int].none() then we need to be able to access the generic type arguments at runtime which is currently impossible (without monkeypatching some typing internals) see https://github.com/python/typing/issues/629. But if we think the functional approach is more appropriate then we should be able to pass in TypeVars to functions at runtime, so we can define replacements on this form (see the linked issue above for the example). This would require fixing https://github.com/python/mypy/issues/6964. I would appreciate any thoughts on which is more Pythonic and more likely to continue being relevant as the typing conversation evolves. The underlying motivation is that Python is increasingly being used to build up computation that executes on other runtimes (TensorFlow, PyTorch, even if they try to hide it now) and type annotations give a nice UX for describing these APIs. We need to be able to inspect them at runtime to build up the right computation graphs, but we also want them to valid under static systems like MyPy, to continue using all the benefits it provides for dev productivity.

2 3

1 PR, multiple issues
by Jeffrey Kintscher June 11, 2019

June 11, 2019

When I create a PR that resolves multiple issues, should I add it to each issue, or just to one issue and add relevant comments to the others? //Jeff -- ----------------------------------------- From there to here, from here to there, funny things are everywhere. -- Theodore Geisel

4 6

Enum and annotations
by Ethan Furman June 11, 2019

June 11, 2019

Greetings! I saw my first annotation mix-up with regards to Enum today: https://stackoverflow.com/q/56532591/208880 #enum import: from enum import Enum # enum definition: class Status(Enum): on: 1 off: 2 My question for the group: Is this worth "fixing" or should I leave it alone? On the one hand it seems like an obvious error, but on the other I hate getting in the way of needs I haven't thought of. -- ~Ethan~

5 4

Using vectorcall for tp_new and tp_init
by Jeroen Demeyer June 9, 2019

June 9, 2019

Hello, I'm starting this thread to brainstorm for using vectorcall to speed up creating instances of Python classes. Currently the following happens when creating an instance of a Python class X using X(.....) and assuming that __new__ and __init__ are Python functions and that the metaclass of X is simply "type": 1. type_call (the tp_call wrapper for type) is invoked with arguments (X, args, kwargs). 2. type_call calls slot_tp_new with arguments (X, args, kwargs). 3. slot_tp_new calls X.__new__, prepending X to the args tuple. A new object obj is returned. 4. type_call calls slot_tp_init with arguments (obj, args, kwargs). 5. slot_tp_init calls type(obj).__init__ method, prepending obj to the args tuple. A new object obj is returned. In the worst case, no less than 6 temporary objects are needed just to pass arguments around: 1. An args tuple and kwargs dict for tp_call 3. An args array with X prepended and a kwnames tuple for __new__ 5. An args array with obj prepended and a kwnames tuple for __init__ This is clearly not as efficient as it could be. An obvious solution would be to introduce variants of tp_new and tp_init using the vectorcall protocol. Assuming PY_VECTORCALL_ARGUMENTS_OFFSET is used, all 6 temporary allocations could be dropped. The implementation could be in the form of two new slots tp_vector_new and tp_vector_init. Since we're just dealing with type slots here (as opposed to offsets in an object structure), this should be easier to implement than PEP 590 itself. Jeroen.

3 3

Question on handling of per-thread async exception with global pending.async_exc flag
by Xintong Zhou June 8, 2019

June 8, 2019

Hi, I am trying to understand the way that async exceptions are handled between _PyEval_EvalFrameDefault (in ceval.c) and PyThreadState_SetAsyncExc (pystate.c). In ceval.c, the eval loop determines whether to check for async exception for the current thread based on the global _PyRuntime.ceval.eval_breaker, which takes the global _PyRuntime.ceval.pending.async_exc as a factor ( source <https://github.com/python/cpython/blob/ef4ec6ed12d6c6200a85068f60483723298b…> ). It feels to me that this implementation will result in missing breaks if async exceptions are set on multiple threads - because _PyRuntime.ceval.eval_breaker and _PyRuntime.ceval.pending.async_exc are shared across multiple threads. After breaking in the first thread and handling its async exception, the two flags are cleared in UNSIGNAL_ASYNC_EXC (source <https://github.com/python/cpython/blob/ef4ec6ed12d6c6200a85068f60483723298b…>). As a result, the second thread will not get the eval breaker. The other flags, like signals and pending calls, do not have this issue because they are only handled on the main thread, which effectively makes the shared flags exclusive for main thread consumption. However, async exception handling is different in this regards. Is this reading correct? Thanks, Xintong

1 0

python-ideas and python-dev migrated to Mailman 3/HyperKitty
by Victor Stinner June 8, 2019

June 8, 2019

Hi, Our kind postmasters Mark Sapiro and Abhilash Raj migrated python-ideas and python-dev mailing lists from Mailman 2 to Mailman 3 (running on Python 3 ;-))! You can now enjoy HyperKitty, the new web UI to access the mailing lists: https://mail.python.org/archives/list/python-dev@python.org/ and https://mail.python.org/archives/list/python-ideas@python.org/ Enhancements: * Ability to post an email directly on the web UI (open a new topic or reply to an existing topic) * Nicer "archives": profile photo (gravatar), thread view * New "Most Active" and "Most Popular" views of mailing lists * Statistics (note: it seems like stats on python-dev are not computed yet) * Single login/password to subscribe to multiple Python mailing lists * Simpler UI to subscribe/unsubscribe * More reliable "permalink" URLs to emails * And more! Many lists already migrated: speed, capi-sig, python-committers, etc. All lists hosted by Mailman3: https://mail.python.org/archives/ -- There are also http://discuss.python.org/ and https://python.zulipchat.com/ to discuss Python ;-) Victor -- Night gathers, and now my watch begins. It shall not end until my death.

13 19

Summary of Python tracker Issues
by Python tracker June 7, 2019

June 7, 2019

ACTIVITY SUMMARY (2019-05-31 - 2019-06-07) 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 7007 (-21) closed 41943 (+104) total 48950 (+83) Open issues with patches: 2817 Issues opened (51) ================== #21492: email.header.decode_header sometimes returns bytes, sometimes https://bugs.python.org/issue21492 reopened by ezio.melotti #32912: Raise non-silent warning for invalid escape sequences https://bugs.python.org/issue32912 reopened by rhettinger #35621: asyncio.create_subprocess_exec() only works with main event lo https://bugs.python.org/issue35621 reopened by koobs #36818: Add PyInterpreterState.runtime. https://bugs.python.org/issue36818 reopened by vstinner #36993: zipfile: tuple IndexError on extract https://bugs.python.org/issue36993 reopened by berker.peksag #37111: Logging - Inconsistent behaviour when handling unicode https://bugs.python.org/issue37111 reopened by jonathan-lp #37120: Provide knobs to disable session ticket generation on TLS 1.3 https://bugs.python.org/issue37120 opened by njs #37123: test_multiprocessing fails randomly on Windows https://bugs.python.org/issue37123 opened by pablogsal #37124: test_msilib is potentially leaking references and memory block https://bugs.python.org/issue37124 opened by pablogsal #37127: Handling pending calls during runtime finalization may cause p https://bugs.python.org/issue37127 opened by eric.snow #37129: Add RWF_APPEND flag https://bugs.python.org/issue37129 opened by bezoka #37130: pathlib.with_name() doesn't like unnamed files. https://bugs.python.org/issue37130 opened by Nophke #37133: Erro "ffi.h: No such file" when build python 3.8 (branch maste https://bugs.python.org/issue37133 opened by heckad #37138: PEP 590 method_vectorcall calls memcpy with NULL src https://bugs.python.org/issue37138 opened by gregory.p.smith #37140: ctypes change made clang fail to build https://bugs.python.org/issue37140 opened by petr.viktorin #37141: Allow multiple separators in Stream.readuntil https://bugs.python.org/issue37141 opened by bmerry #37144: tarfile.open: improper handling of path-like object https://bugs.python.org/issue37144 opened by dm #37146: opcode cache for LOAD_GLOBAL emits false alarm in memory leak https://bugs.python.org/issue37146 opened by vstinner #37149: link to official documentation tkinter failed !!! https://bugs.python.org/issue37149 opened by xameridu #37150: Do not allow to pass FileType class object instead of instance https://bugs.python.org/issue37150 opened by zygocephalus #37151: Calling code cleanup after PEP 590 https://bugs.python.org/issue37151 opened by jdemeyer #37154: test_utf8_mode: test_env_var() fails on AMD64 Fedora Rawhide C https://bugs.python.org/issue37154 opened by vstinner #37155: test_asyncio: test_stdin_broken_pipe() failed on AMD64 FreeBSD https://bugs.python.org/issue37155 opened by vstinner #37157: shutil: add reflink=False to file copy functions to control cl https://bugs.python.org/issue37157 opened by vstinner #37159: Use copy_file_range() in shutil.copyfile() (server-side copy) https://bugs.python.org/issue37159 opened by giampaolo.rodola #37160: thread native id netbsd support https://bugs.python.org/issue37160 opened by David Carlier #37161: Pre-populate user editable text in input() https://bugs.python.org/issue37161 opened by steven.daprano #37163: dataclasses.replace() fails with the field named "obj" https://bugs.python.org/issue37163 opened by serhiy.storchaka #37166: inspect.findsource doesn't handle shortened files gracefully https://bugs.python.org/issue37166 opened by thatch #37168: Decimal divisions sometimes 10x or 100x too large https://bugs.python.org/issue37168 opened by Phil Frost #37172: Odd error awating a Future https://bugs.python.org/issue37172 opened by Dima.Tisnek #37173: inspect.getfile error names module instead of passed class https://bugs.python.org/issue37173 opened by flying sheep #37174: sched.py: run() is caught in delayfunc even if all events are https://bugs.python.org/issue37174 opened by ernestum #37175: make install: make compileall optional https://bugs.python.org/issue37175 opened by blueyed #37176: super() docs don't say what super() does https://bugs.python.org/issue37176 opened by jdemeyer #37178: One argument form of math.perm() https://bugs.python.org/issue37178 opened by rhettinger #37179: asyncio loop.start_tls() provide support for TLS in TLS https://bugs.python.org/issue37179 opened by cooperlees #37181: fix test_regrtest failures on Windows arm64 https://bugs.python.org/issue37181 opened by Paul Monson #37184: suggesting option to raise exception if process exits nonzero https://bugs.python.org/issue37184 opened by nlevitt #37185: use os.memfd_create in multiprocessing.shared_memory? https://bugs.python.org/issue37185 opened by pierreglaser #37187: CField.size from the ctypes module does not behave as document https://bugs.python.org/issue37187 opened by Eric Wieser #37188: Creating a ctypes array of an element with size zero causes "F https://bugs.python.org/issue37188 opened by Eric Wieser #37189: PyRun_String not exported in python38.dll https://bugs.python.org/issue37189 opened by cgohlke #37190: asyncio.iscoroutinefunction(<async_generator>.asend) returns F https://bugs.python.org/issue37190 opened by Radu Matei Lăcraru #37191: Python.h contains intermingled declarations https://bugs.python.org/issue37191 opened by petr.viktorin #37193: Memory leak while running TCP/UDPServer with socketserver.Thre https://bugs.python.org/issue37193 opened by maru-n #37194: Move new vector private declarations to the internal C API https://bugs.python.org/issue37194 opened by vstinner #37195: test_utime fails on MacOS Mojave (Kernel Version 18.6.0:) https://bugs.python.org/issue37195 opened by pablogsal #37196: Allowing arbitrary expressions in the @expression syntax https://bugs.python.org/issue37196 opened by maggyero #37198: _parse_localename fail to parse 'en_IL' https://bugs.python.org/issue37198 opened by hodai goldman #37199: Test suite fails when Ipv6 is unavailable https://bugs.python.org/issue37199 opened by Nophke Most recent 15 issues with no replies (15) ========================================== #37199: Test suite fails when Ipv6 is unavailable https://bugs.python.org/issue37199 #37193: Memory leak while running TCP/UDPServer with socketserver.Thre https://bugs.python.org/issue37193 #37190: asyncio.iscoroutinefunction(<async_generator>.asend) returns F https://bugs.python.org/issue37190 #37185: use os.memfd_create in multiprocessing.shared_memory? https://bugs.python.org/issue37185 #37181: fix test_regrtest failures on Windows arm64 https://bugs.python.org/issue37181 #37174: sched.py: run() is caught in delayfunc even if all events are https://bugs.python.org/issue37174 #37173: inspect.getfile error names module instead of passed class https://bugs.python.org/issue37173 #37161: Pre-populate user editable text in input() https://bugs.python.org/issue37161 #37160: thread native id netbsd support https://bugs.python.org/issue37160 #37155: test_asyncio: test_stdin_broken_pipe() failed on AMD64 FreeBSD https://bugs.python.org/issue37155 #37129: Add RWF_APPEND flag https://bugs.python.org/issue37129 #37107: ensurepip --upgrade doesn't change the version of pip used by https://bugs.python.org/issue37107 #37097: python_is_optimized() false negatives https://bugs.python.org/issue37097 #37096: Add large-file tests for modules using sendfile(2) https://bugs.python.org/issue37096 #37095: [Feature Request]: Add zstd support in tarfile https://bugs.python.org/issue37095 Most recent 15 issues waiting for review (15) ============================================= #37194: Move new vector private declarations to the internal C API https://bugs.python.org/issue37194 #37193: Memory leak while running TCP/UDPServer with socketserver.Thre https://bugs.python.org/issue37193 #37191: Python.h contains intermingled declarations https://bugs.python.org/issue37191 #37188: Creating a ctypes array of an element with size zero causes "F https://bugs.python.org/issue37188 #37181: fix test_regrtest failures on Windows arm64 https://bugs.python.org/issue37181 #37173: inspect.getfile error names module instead of passed class https://bugs.python.org/issue37173 #37166: inspect.findsource doesn't handle shortened files gracefully https://bugs.python.org/issue37166 #37163: dataclasses.replace() fails with the field named "obj" https://bugs.python.org/issue37163 #37159: Use copy_file_range() in shutil.copyfile() (server-side copy) https://bugs.python.org/issue37159 #37157: shutil: add reflink=False to file copy functions to control cl https://bugs.python.org/issue37157 #37151: Calling code cleanup after PEP 590 https://bugs.python.org/issue37151 #37150: Do not allow to pass FileType class object instead of instance https://bugs.python.org/issue37150 #37146: opcode cache for LOAD_GLOBAL emits false alarm in memory leak https://bugs.python.org/issue37146 #37144: tarfile.open: improper handling of path-like object https://bugs.python.org/issue37144 #37140: ctypes change made clang fail to build https://bugs.python.org/issue37140 Top 10 most discussed issues (10) ================================= #33608: Add a cross-interpreter-safe mechanism to indicate that an obj https://bugs.python.org/issue33608 18 msgs #36839: Support the buffer protocol in code objects https://bugs.python.org/issue36839 16 msgs #28708: Low FD_SETSIZE limit on Windows https://bugs.python.org/issue28708 12 msgs #37168: Decimal divisions sometimes 10x or 100x too large https://bugs.python.org/issue37168 12 msgs #37176: super() docs don't say what super() does https://bugs.python.org/issue37176 12 msgs #5680: Simulate command-line arguments for program run in IDLE https://bugs.python.org/issue5680 10 msgs #26826: Expose new copy_file_range() syscall in os module. https://bugs.python.org/issue26826 10 msgs #35621: asyncio.create_subprocess_exec() only works with main event lo https://bugs.python.org/issue35621 10 msgs #37111: Logging - Inconsistent behaviour when handling unicode https://bugs.python.org/issue37111 10 msgs #37191: Python.h contains intermingled declarations https://bugs.python.org/issue37191 9 msgs Issues closed (106) =================== #2661: Mapping tests cannot be passed by user implementations https://bugs.python.org/issue2661 closed by cheryl.sabella #12202: Check status returns in msilib.SummaryInformation.GetProperty( https://bugs.python.org/issue12202 closed by berker.peksag #12639: msilib Directory.start_component() fails if keyfile is not Non https://bugs.python.org/issue12639 closed by steve.dower #15115: Duplicated Content-Transfer-Encoding header when applying emai https://bugs.python.org/issue15115 closed by cheryl.sabella #18911: minidom does not encode correctly when calling Document.writex https://bugs.python.org/issue18911 closed by scoder #19184: dis module has incorrect docs for RAISE_VARARGS https://bugs.python.org/issue19184 closed by ezio.melotti #20602: sys.flags and sys.float_info disappear at shutdown https://bugs.python.org/issue20602 closed by vstinner #21110: Slowdown and high memory usage when adding a new module in emb https://bugs.python.org/issue21110 closed by MrValdez #21879: str.format() gives poor diagnostic on placeholder mismatch https://bugs.python.org/issue21879 closed by rhettinger #23324: Nonblocking serial io using Arduino and Ubuntu 14.10 (Python 3 https://bugs.python.org/issue23324 closed by willingc #24039: Idle: some modal dialogs maximize, don't minimize https://bugs.python.org/issue24039 closed by taleinat #26219: implement per-opcode cache in ceval https://bugs.python.org/issue26219 closed by vstinner #26836: Add memfd_create to os module https://bugs.python.org/issue26836 closed by christian.heimes #29414: Change 'the for statement is such an iterator' in Tutorial https://bugs.python.org/issue29414 closed by rhettinger #29984: Improve test coverage for 'heapq' module https://bugs.python.org/issue29984 closed by rhettinger #30699: Misleading class names in datetime.tzinfo usage examples https://bugs.python.org/issue30699 closed by vstinner #30786: getaddrinfo emulation does not support AI_NUMERICSERV https://bugs.python.org/issue30786 closed by cheryl.sabella #30809: IDLE parenmatch - highlighting options https://bugs.python.org/issue30809 closed by terry.reedy #31006: typing.NamedTuple should add annotations to its constructor (_ https://bugs.python.org/issue31006 closed by levkivskyi #31087: asyncio.create_subprocess_* should honor `encoding` https://bugs.python.org/issue31087 closed by asvetlov #31968: exec(): method's default arguments from dict-inherited globals https://bugs.python.org/issue31968 closed by rhettinger #32052: Provide access to buffer of asyncio.StreamReader https://bugs.python.org/issue32052 closed by asvetlov #32115: Ignored SIGCHLD causes asyncio.Process.wait to hang forever https://bugs.python.org/issue32115 closed by asvetlov #32411: Idlelib.browser: stop sorting dicts created by pyclbr https://bugs.python.org/issue32411 closed by terry.reedy #32515: Add an option to trace to run module as a script https://bugs.python.org/issue32515 closed by pablogsal #32573: All sys attributes (.argv, ...) should exist in embedded envir https://bugs.python.org/issue32573 closed by vstinner #32644: unittest.mock.call len() error https://bugs.python.org/issue32644 closed by xtreak #33048: macOS job broken on Travis CI https://bugs.python.org/issue33048 closed by willingc #33361: readline() + seek() on codecs.EncodedFile breaks next readline https://bugs.python.org/issue33361 closed by berker.peksag #33569: dataclasses InitVar does not maintain any type info https://bugs.python.org/issue33569 closed by eric.smith #34222: Email message serialization enters an infinite loop when foldi https://bugs.python.org/issue34222 closed by cheryl.sabella #34261: Add description to clinic.py https://bugs.python.org/issue34261 closed by pablogsal #34303: micro-optimizations in functools.reduce() https://bugs.python.org/issue34303 closed by rhettinger #34763: Treat U+4E17 as a numeric value https://bugs.python.org/issue34763 closed by xiang.zhang #34767: Optimize asyncio.Lock https://bugs.python.org/issue34767 closed by asvetlov #35022: MagicMock should support `__fspath__` https://bugs.python.org/issue35022 closed by xtreak #35082: Mock.__dir__ lists deleted attributes https://bugs.python.org/issue35082 closed by asvetlov #35431: Add a function for computing binomial coefficients to the math https://bugs.python.org/issue35431 closed by rhettinger #35537: use os.posix_spawn in subprocess https://bugs.python.org/issue35537 closed by vstinner #35551: Encoding and alias issues https://bugs.python.org/issue35551 closed by cheryl.sabella #35610: IDLE: replace use of EditorWindow.context_use_ps1 https://bugs.python.org/issue35610 closed by terry.reedy #35635: asyncio.create_subprocess_exec() only works in main thread https://bugs.python.org/issue35635 closed by asvetlov #35761: Allow dataclasses to be updated in place https://bugs.python.org/issue35761 closed by eric.smith #35763: IDLE calltips: make positional note less obtrusive https://bugs.python.org/issue35763 closed by terry.reedy #35996: Optional modulus argument for new math.prod() function https://bugs.python.org/issue35996 closed by rhettinger #36027: Support negative exponents in pow() where a modulus is specifi https://bugs.python.org/issue36027 closed by mark.dickinson #36732: test_asyncio: test_huge_content_recvinto() fails randomly https://bugs.python.org/issue36732 closed by vstinner #36786: "make install" should run compileall in parallel https://bugs.python.org/issue36786 closed by pitrou #36813: QueueListener not calling task_done upon termination https://bugs.python.org/issue36813 closed by asvetlov #36848: autospec fails with AttributeError when mocked class has __sig https://bugs.python.org/issue36848 closed by xtreak #36870: test_asyncio: test_drain_raises() fails randomly on Windows https://bugs.python.org/issue36870 closed by vstinner #36879: bug with round() and "numpy floats" https://bugs.python.org/issue36879 closed by mark.dickinson #36885: Make makeunicode.py script more readable https://bugs.python.org/issue36885 closed by scoder #36894: test_multiprocessing_spawn regression on Windows https://bugs.python.org/issue36894 closed by vstinner #36935: bpo-35813 introduced usage of the deprecated PyErr_SetFromWind https://bugs.python.org/issue36935 closed by vstinner #36976: email: AttributeError https://bugs.python.org/issue36976 closed by berker.peksag #36984: typing docs "versionadded" is inaccurate for many attributes https://bugs.python.org/issue36984 closed by levkivskyi #37005: bz2 module doesn't write end-of-stream marker https://bugs.python.org/issue37005 closed by Dobatymo #37014: fileinput module should document that openhook and mode are ig https://bugs.python.org/issue37014 closed by ezio.melotti #37024: SQLite flag in configure due to homebrew not linking sqlite https://bugs.python.org/issue37024 closed by ned.deily #37029: PyObject_Free is O(N) where N = # of arenas https://bugs.python.org/issue37029 closed by tim.peters #37068: Emit SyntaxWarning for f-strings without expressions ? https://bugs.python.org/issue37068 closed by terry.reedy #37075: Error message improvement for AsyncMock https://bugs.python.org/issue37075 closed by xtreak #37087: Adding native id support for openbsd https://bugs.python.org/issue37087 closed by vstinner #37098: test_memfd_create() test failure https://bugs.python.org/issue37098 closed by vstinner #37100: test_coroutine.test_unawaited_warning_when_module_broken fails https://bugs.python.org/issue37100 closed by vstinner #37110: Clarify hashability of custom class instances https://bugs.python.org/issue37110 closed by rhettinger #37116: Use PEP 570 syntax for positional-only parameters https://bugs.python.org/issue37116 closed by serhiy.storchaka #37117: Simplify customization of the logging time through datefmt https://bugs.python.org/issue37117 closed by vinay.sajip #37118: Why is GIL on 2.7 so much faster than 3.7 https://bugs.python.org/issue37118 closed by zach.ware #37119: Equality on dict.values() are inconsistent between 2 and 3 https://bugs.python.org/issue37119 closed by serhiy.storchaka #37121: 'ა'.upper() should return 'ა' https://bugs.python.org/issue37121 closed by SilentGhost #37122: Make co->co_argcount represent the total number of positional https://bugs.python.org/issue37122 closed by pablogsal #37125: math.comb is leaking references https://bugs.python.org/issue37125 closed by pablogsal #37126: test_threading is leaking references https://bugs.python.org/issue37126 closed by pablogsal #37128: Add math.perm() https://bugs.python.org/issue37128 closed by serhiy.storchaka #37131: all(range()...)) is needlessley slow https://bugs.python.org/issue37131 closed by serhiy.storchaka #37132: Add a module for integer related math functions https://bugs.python.org/issue37132 closed by serhiy.storchaka #37134: Use PEP570 syntax in the documentation https://bugs.python.org/issue37134 closed by pablogsal #37135: test_multiprocessing_spawn segfaults on AMD64 FreeBSD CURRENT https://bugs.python.org/issue37135 closed by vstinner #37136: Travis CI: Documentation tests fails with Sphinx 2.1 https://bugs.python.org/issue37136 closed by vstinner #37137: test_asyncio: test_cancel_gather_2() dangling thread https://bugs.python.org/issue37137 closed by vstinner #37139: Inconsistent behavior of email.header.decode_header https://bugs.python.org/issue37139 closed by SilentGhost #37142: test_asyncio timed out on AMD64 FreeBSD CURRENT Shared 3.x https://bugs.python.org/issue37142 closed by vstinner #37143: multiprocessing crashed with EXCEPTION_ACCESS_VIOLATION on Pyt https://bugs.python.org/issue37143 closed by vstinner #37145: collections.abc.MappingView mixins rely on undocumented _mappi https://bugs.python.org/issue37145 closed by rhettinger #37147: f-string debugging f"{x=[}" adds [filename:lineno] as prefix https://bugs.python.org/issue37147 closed by aldwinaldwin #37148: test_asyncio fails on refleaks buildbots https://bugs.python.org/issue37148 closed by pablogsal #37152: Add AF_LOCAL alias for AF_UNIX https://bugs.python.org/issue37152 closed by christian.heimes #37153: test_venv: test_multiprocessing() hangs randomly on x86 Window https://bugs.python.org/issue37153 closed by vstinner #37156: Fix libssl DLL tag in Tools/msi project https://bugs.python.org/issue37156 closed by steve.dower #37158: Speed-up statistics.fmean() https://bugs.python.org/issue37158 closed by rhettinger #37162: new importlib dependencies csv, email and zipfile https://bugs.python.org/issue37162 closed by brett.cannon #37164: dict creation with converted zip objects produces inconsistent https://bugs.python.org/issue37164 closed by Dane Howard #37165: Convert _collections._count_elements() to the Argument Clinic https://bugs.python.org/issue37165 closed by rhettinger #37167: Cannot build Windows python_d.exe in master branch https://bugs.python.org/issue37167 closed by terry.reedy #37169: test_pyobject_is_freed_free fails with 3.8.0beta1 https://bugs.python.org/issue37169 closed by vstinner #37170: Wrong return value from PyLong_AsUnsignedLongLongMask on PyErr https://bugs.python.org/issue37170 closed by vstinner #37171: Documentation mismatch contextvars module vs PEP-567 https://bugs.python.org/issue37171 closed by Dima.Tisnek #37177: IDLE: Search dialogs can be hidden behind the main window https://bugs.python.org/issue37177 closed by taleinat #37180: Fix Persian KAF in mac_farsi.py https://bugs.python.org/issue37180 closed by SilentGhost #37182: ast - handling new line inside a string https://bugs.python.org/issue37182 closed by eric.smith #37183: Linker failure when creating main binary with python-config -- https://bugs.python.org/issue37183 closed by christian.heimes #37186: Everyone uses GIL wrong! = DEADLOCK https://bugs.python.org/issue37186 closed by eric.snow #37192: pip instal math3d - EROR https://bugs.python.org/issue37192 closed by SilentGhost #37197: [Idle-dev] Feedback appreciated for two suggested new features https://bugs.python.org/issue37197 closed by SilentGhost

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PEP 596 proposes doubling the release cadence
by Łukasz Langa June 7, 2019

June 7, 2019

PEP body and discussion link: https://discuss.python.org/t/pep-596-python-3-9-release-schedule-doubling-t… - Ł

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