Mailman 3 June 2019 - Python-Dev

v3.8b1 Breaks PyQt on Windows (Issue 36085/os.add_dll_directory())
by Phil Thompson June 23, 2019

June 23, 2019

The implementation of issue 36085 breaks PyQt on Windows as it relies on PATH to find the Qt DLLs. The problem is that PyQt is built using the stable ABI and a single wheel is supposed to support all versions of Python starting with v3.5. On the assumption (perhaps naive) that using the stable ABI would avoid future compatibility issues, the existing PyPI wheels have long been tagged with cp38. Was this issue considered at the time? What is the official view? Thanks, Phil

3 3

Preserve keyword argument order in unittest.mock call repr output
by Karthikeyan Singaravelan June 22, 2019

June 22, 2019

From Python 3.6 the order of keyword arguments to a function is preserved. In https://bugs.python.org/issue21256 the order of keyword arguments for unittest.mock's repr were sorted to return deterministic output for usage in doctest and other use cases. This currently gives little inconsistent output where the keyword argument order in below mock call is (b=2, a=1) but it's sorted in the error message and mock_calls list to give (a=1, b=2). I have opened https://bugs.python.org/issue37212 to preserve the order. It was recommended in the issue 21256 too at https://bugs.python.org/issue21256#msg216512 . The drawback is that it's backwards incompatible where tests that assert error messages might have used the sorted order. Due to equality implementation call(a=1, b=2) == call(b=2, a=1) is still True so assertions are not affected. There are no test failures in mock test suite except the test in the original issue where sorted output is asserted. Sorting the keyword arguments was also not documented. I propose removing this sorted order in 3.9 and to preserve the original order. The change is straightforward and I can add a PR if this change is accepted. >>> from unittest.mock import Mock, call >>> m = Mock(name='m') >>> m(b=2, a=1) <Mock name='m()' id='4339069168'> >>> call(a=1, b=2) == call(b=2, a=1) True >>> m.mock_calls [call(a=1, b=2)] >>> m.assert_called_with(c=1) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Users/karthikeyansingaravelan/stuff/python/cpython/Lib/unittest/mock.py", line 870, in assert_called_with raise AssertionError(_error_message()) from cause AssertionError: expected call not found. Expected: m(c=1) Actual: m(a=1, b=2)

2 1

Summary of Python tracker Issues
by Python tracker June 21, 2019

June 21, 2019

ACTIVITY SUMMARY (2019-06-14 - 2019-06-21) 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 7038 (+16) closed 42078 (+65) total 49116 (+81) Open issues with patches: 2828 Issues opened (63) ================== #24214: UTF-8 incremental decoder doesn't support surrogatepass correc https://bugs.python.org/issue24214 reopened by vstinner #32846: Deletion of large sets of strings is extra slow https://bugs.python.org/issue32846 reopened by inada.naoki #34162: idlelib/NEWS.txt for 3.8.0 (and backports) https://bugs.python.org/issue34162 reopened by terry.reedy #34875: Change .js mime to "text/javascript" https://bugs.python.org/issue34875 reopened by mylesborins #35998: test_asyncio: test_start_tls_server_1() TimeoutError on Fedora https://bugs.python.org/issue35998 reopened by vstinner #36732: test_asyncio: test_huge_content_recvinto() fails randomly https://bugs.python.org/issue36732 reopened by vstinner #37285: Python 2.7 setup.py incorrectly double-joins SDKROOT https://bugs.python.org/issue37285 opened by mistydemeo #37287: picke cannot dump Exception subclasses with different super() https://bugs.python.org/issue37287 opened by bquinlan #37289: regression in Cython when pickling objects https://bugs.python.org/issue37289 opened by tcaswell #37291: AST - code cleanup https://bugs.python.org/issue37291 opened by David Carlier #37292: _xxsubinterpreters: Can't unpickle objects defined in __main__ https://bugs.python.org/issue37292 opened by Crusader Ky #37293: concurrent.futures.InterpreterPoolExecutor https://bugs.python.org/issue37293 opened by Crusader Ky #37294: concurrent.futures.ProcessPoolExecutor and multiprocessing.poo https://bugs.python.org/issue37294 opened by maggyero #37295: Possible optimizations for math.comb() https://bugs.python.org/issue37295 opened by rhettinger #37296: pdb next vs __next__ https://bugs.python.org/issue37296 opened by tsingi #37297: function changed when pickle bound method object https://bugs.python.org/issue37297 opened by georgexsh #37298: IDLE: Revise html to tkinker converter for help.html https://bugs.python.org/issue37298 opened by terry.reedy #37301: CGIHTTPServer doesn't handle long POST requests https://bugs.python.org/issue37301 opened by vsbogd #37302: Add an "onerror" callback parameter to the tempfile.TemporaryD https://bugs.python.org/issue37302 opened by Jeffrey.Kintscher #37305: Add MIME type for Web App Manifest https://bugs.python.org/issue37305 opened by filips123 #37307: isinstance/issubclass doc isn't clear on whether it's an AND o https://bugs.python.org/issue37307 opened by leewz #37308: Possible mojibake in mmap.mmap() when using the tagname parame https://bugs.python.org/issue37308 opened by ZackerySpytz #37309: idlelib/NEWS.txt for 3.9.0 and backports https://bugs.python.org/issue37309 opened by terry.reedy #37310: Solaris 11.3 w/ Studio 12.6 test_ctypes fail https://bugs.python.org/issue37310 opened by gmarler #37311: Solaris 11.3 w/ Studio 12.6 test_support fail https://bugs.python.org/issue37311 opened by gmarler #37313: test_concurrent_futures stopped after 25 hours on AMD64 Window https://bugs.python.org/issue37313 opened by vstinner #37314: Compilation failed on AMD64 Debian root 3.8: undefined referen https://bugs.python.org/issue37314 opened by vstinner #37317: asyncio gather doesn't handle custom exceptions that inherit f https://bugs.python.org/issue37317 opened by cmermingas #37319: Deprecate using random.randrange() with non-integers https://bugs.python.org/issue37319 opened by serhiy.storchaka #37322: test_ssl: test_pha_required_nocert() emits a ResourceWarning https://bugs.python.org/issue37322 opened by vstinner #37323: test_asyncio: test_debug_mode_interop() fails using -Werror https://bugs.python.org/issue37323 opened by vstinner #37324: collections: remove deprecated aliases to ABC classes https://bugs.python.org/issue37324 opened by vstinner #37326: Windows LICENSE.txt do not contain libffi license https://bugs.python.org/issue37326 opened by indygreg #37328: remove deprecated HTMLParser.unescape https://bugs.python.org/issue37328 opened by inada.naoki #37329: [2.7] valgrind python2 -m test.regrtest test___all__: definite https://bugs.python.org/issue37329 opened by vstinner #37330: open(): remove 'U' mode, deprecated since Python 3.3 https://bugs.python.org/issue37330 opened by vstinner #37334: Add a cancel method to asyncio Queues https://bugs.python.org/issue37334 opened by Martin.Teichmann #37335: Add 646 ASCII alias to locale coercion tests. https://bugs.python.org/issue37335 opened by kulikjak #37336: os.sendfile() support missing for AIX platform https://bugs.python.org/issue37336 opened by Michael.Felt #37337: Add _PyObject_VectorcallMethod() function https://bugs.python.org/issue37337 opened by jdemeyer #37338: test_multiprocessing_forkserver: test_thousand() logged on AMD https://bugs.python.org/issue37338 opened by vstinner #37339: os.path.ismount returns true on nested btrfs subvolumes https://bugs.python.org/issue37339 opened by eike #37340: remove free_list for bound method objects https://bugs.python.org/issue37340 opened by inada.naoki #37344: plistlib doesn't skip whitespace in XML format detection https://bugs.python.org/issue37344 opened by shaneg #37345: Add formal support for UDPLITE protococl https://bugs.python.org/issue37345 opened by gappleto97 #37346: Documentation of os not using OSError subclasses https://bugs.python.org/issue37346 opened by timhoffm #37347: Reference-counting problem in sqlite https://bugs.python.org/issue37347 opened by gescheit #37348: Optimize PyUnicode_GetString for short ASCII strings https://bugs.python.org/issue37348 opened by inada.naoki #37349: venv.EnvBuilder environmental variable hooks https://bugs.python.org/issue37349 opened by donovick #37350: print ResourceWarning object traceback when raised as error wi https://bugs.python.org/issue37350 opened by graingert #37351: Drop libpython38.a from Windows release https://bugs.python.org/issue37351 opened by steve.dower #37352: Typo in documentation: "to making it easy" https://bugs.python.org/issue37352 opened by mdk #37353: Source code has not always been forward-compatible https://bugs.python.org/issue37353 opened by mdk #37354: Write PowerShell Activate.ps1 to be static so it can be signed https://bugs.python.org/issue37354 opened by brett.cannon #37355: SSLSocket.read does a GIL round-trip for every 16KB TLS record https://bugs.python.org/issue37355 opened by josnyder #37357: mbox From line wrongly detected https://bugs.python.org/issue37357 opened by Andro #37358: Use vectorcall for functools.partial https://bugs.python.org/issue37358 opened by jdemeyer #37359: test_regrtest: test_list_cases() fails on x86 Gentoo Installed https://bugs.python.org/issue37359 opened by vstinner #37360: Building without OpenPTY and without stropts.h https://bugs.python.org/issue37360 opened by nickpapior #37362: test_gdb must not fail on "unexpected" messages written into s https://bugs.python.org/issue37362 opened by vstinner #37363: Additional PEP578 hooks https://bugs.python.org/issue37363 opened by steve.dower #37364: Use io.open_code for .pth files https://bugs.python.org/issue37364 opened by steve.dower #37365: RecursionError not caught explicitly may crash with "Aborted ( https://bugs.python.org/issue37365 opened by Delgan Most recent 15 issues with no replies (15) ========================================== #37365: RecursionError not caught explicitly may crash with "Aborted ( https://bugs.python.org/issue37365 #37363: Additional PEP578 hooks https://bugs.python.org/issue37363 #37358: Use vectorcall for functools.partial https://bugs.python.org/issue37358 #37355: SSLSocket.read does a GIL round-trip for every 16KB TLS record https://bugs.python.org/issue37355 #37346: Documentation of os not using OSError subclasses https://bugs.python.org/issue37346 #37337: Add _PyObject_VectorcallMethod() function https://bugs.python.org/issue37337 #37336: os.sendfile() support missing for AIX platform https://bugs.python.org/issue37336 #37335: Add 646 ASCII alias to locale coercion tests. https://bugs.python.org/issue37335 #37328: remove deprecated HTMLParser.unescape https://bugs.python.org/issue37328 #37322: test_ssl: test_pha_required_nocert() emits a ResourceWarning https://bugs.python.org/issue37322 #37314: Compilation failed on AMD64 Debian root 3.8: undefined referen https://bugs.python.org/issue37314 #37311: Solaris 11.3 w/ Studio 12.6 test_support fail https://bugs.python.org/issue37311 #37310: Solaris 11.3 w/ Studio 12.6 test_ctypes fail https://bugs.python.org/issue37310 #37308: Possible mojibake in mmap.mmap() when using the tagname parame https://bugs.python.org/issue37308 #37305: Add MIME type for Web App Manifest https://bugs.python.org/issue37305 Most recent 15 issues waiting for review (15) ============================================= #37362: test_gdb must not fail on "unexpected" messages written into s https://bugs.python.org/issue37362 #37358: Use vectorcall for functools.partial https://bugs.python.org/issue37358 #37353: Source code has not always been forward-compatible https://bugs.python.org/issue37353 #37351: Drop libpython38.a from Windows release https://bugs.python.org/issue37351 #37349: venv.EnvBuilder environmental variable hooks https://bugs.python.org/issue37349 #37348: Optimize PyUnicode_GetString for short ASCII strings https://bugs.python.org/issue37348 #37347: Reference-counting problem in sqlite https://bugs.python.org/issue37347 #37346: Documentation of os not using OSError subclasses https://bugs.python.org/issue37346 #37345: Add formal support for UDPLITE protococl https://bugs.python.org/issue37345 #37344: plistlib doesn't skip whitespace in XML format detection https://bugs.python.org/issue37344 #37340: remove free_list for bound method objects https://bugs.python.org/issue37340 #37337: Add _PyObject_VectorcallMethod() function https://bugs.python.org/issue37337 #37335: Add 646 ASCII alias to locale coercion tests. https://bugs.python.org/issue37335 #37334: Add a cancel method to asyncio Queues https://bugs.python.org/issue37334 #37330: open(): remove 'U' mode, deprecated since Python 3.3 https://bugs.python.org/issue37330 Top 10 most discussed issues (10) ================================= #37250: C files generated by Cython set tp_print to 0: PyTypeObject.tp https://bugs.python.org/issue37250 38 msgs #37289: regression in Cython when pickling objects https://bugs.python.org/issue37289 19 msgs #37349: venv.EnvBuilder environmental variable hooks https://bugs.python.org/issue37349 12 msgs #35360: Update SQLite to 3.28 in Windows and macOS installer builds https://bugs.python.org/issue35360 10 msgs #37348: Optimize PyUnicode_GetString for short ASCII strings https://bugs.python.org/issue37348 10 msgs #35998: test_asyncio: test_start_tls_server_1() TimeoutError on Fedora https://bugs.python.org/issue35998 9 msgs #37271: Make multiple passes of the peephole optimizer until bytecode https://bugs.python.org/issue37271 8 msgs #37301: CGIHTTPServer doesn't handle long POST requests https://bugs.python.org/issue37301 8 msgs #35031: test_asyncio test_start_tls_server_1 fails in AMD64 FreeBSD CU https://bugs.python.org/issue35031 7 msgs #37340: remove free_list for bound method objects https://bugs.python.org/issue37340 7 msgs Issues closed (65) ================== #5680: Simulate command-line arguments for program run in IDLE https://bugs.python.org/issue5680 closed by terry.reedy #9665: Buid issues on Cygwin - _curses, _curses_panel, and _io https://bugs.python.org/issue9665 closed by inada.naoki #24980: Allow for providing 'on_new_thread' callback to 'concurrent.fu https://bugs.python.org/issue24980 closed by bquinlan #27860: Improvements to ipaddress module https://bugs.python.org/issue27860 closed by inada.naoki #28595: shlex.shlex should not augment wordchars https://bugs.python.org/issue28595 closed by vinay.sajip #28890: logging.handlers: Document that QueueListener is a daemon thre https://bugs.python.org/issue28890 closed by vinay.sajip #29001: logging.handlers.RotatingFileHandler rotation broken under gun https://bugs.python.org/issue29001 closed by vinay.sajip #31985: Deprecate openfp() in aifc, sunau and wave https://bugs.python.org/issue31985 closed by vstinner #32252: test_regrtest leaves a test_python_* directory in TEMPDIR https://bugs.python.org/issue32252 closed by vstinner #33529: [security] Infinite loop on folding email (_fold_as_ew()) if a https://bugs.python.org/issue33529 closed by vstinner #34506: Traceback logged when SSL handshake fails https://bugs.python.org/issue34506 closed by asvetlov #34631: Upgrade to OpenSSL 1.1.1c, 1.1.0k, and/or 1.0.2s https://bugs.python.org/issue34631 closed by ned.deily #34796: Tkinter scrollbar issues on Mac. https://bugs.python.org/issue34796 closed by terry.reedy #34806: distutils tests fail with recent 3.7 branch https://bugs.python.org/issue34806 closed by ned.deily #34903: strptime %d handling of single digit day of month https://bugs.python.org/issue34903 closed by p-ganssle #35455: Solaris thread_time doesn't work with current implementation https://bugs.python.org/issue35455 closed by kulikjak #35647: Cookie path check returns incorrect results https://bugs.python.org/issue35647 closed by xtreak #35922: robotparser crawl_delay and request_rate do not work with no m https://bugs.python.org/issue35922 closed by taleinat #36033: logging.makeLogRecord should update "rv" using a dict defined https://bugs.python.org/issue36033 closed by vinay.sajip #36165: DOC: ssl.rst is missing formatting on two links https://bugs.python.org/issue36165 closed by Mariatta #36231: Support builds on macOS without installed system header files https://bugs.python.org/issue36231 closed by ned.deily #36429: Fix starting IDLE with pyshell https://bugs.python.org/issue36429 closed by terry.reedy #36688: _dummy_thread lacks an RLock implementaiton https://bugs.python.org/issue36688 closed by vstinner #36704: logging.FileHandler currently hardcodes errors='strict' https://bugs.python.org/issue36704 closed by vinay.sajip #36785: Implement PEP 574 https://bugs.python.org/issue36785 closed by pitrou #36985: typing.ForwardRef is undocumented https://bugs.python.org/issue36985 closed by levkivskyi #37039: IDLE: Improve zoomheight doc and behavior. https://bugs.python.org/issue37039 closed by terry.reedy #37071: HTMLParser mistakenly inventing new tags while parsing https://bugs.python.org/issue37071 closed by cheryl.sabella #37133: Erro "ffi.h: No such file" when build python 3.8 (branch maste https://bugs.python.org/issue37133 closed by zach.ware #37189: PyRun_String not exported in python38.dll https://bugs.python.org/issue37189 closed by vstinner #37194: Move new vector private declarations to the internal C API https://bugs.python.org/issue37194 closed by vstinner #37214: Add new EncodingWarning warning category: emitted when the loc https://bugs.python.org/issue37214 closed by vstinner #37220: test_idle crash on Windows 2.7 when run with -R: https://bugs.python.org/issue37220 closed by terry.reedy #37233: Use _PY_FASTCALL_SMALL_STACK for method_vectorcall https://bugs.python.org/issue37233 closed by jdemeyer #37243: test_sendfile in asyncio crashes when os.sendfile() is not sup https://bugs.python.org/issue37243 closed by Michael.Felt #37248: support conversion of `func(**{} if a else b)` https://bugs.python.org/issue37248 closed by xtreak #37258: Logging cache not cleared properly when setting level https://bugs.python.org/issue37258 closed by vinay.sajip #37267: os.dup() creates an inheritable fd when handling a character f https://bugs.python.org/issue37267 closed by vstinner #37275: GetConsole(Output)CP is used even when stdin/stdout is redirec https://bugs.python.org/issue37275 closed by inada.naoki #37279: asyncio sendfile sends extra data in the last chunk in fallbac https://bugs.python.org/issue37279 closed by asvetlov #37280: Use threadpool for reading from file for sendfile fallback mod https://bugs.python.org/issue37280 closed by asvetlov #37286: Pasting emoji crashes IDLE https://bugs.python.org/issue37286 closed by terry.reedy #37288: Fix Windows build when --no-tkinter is specified https://bugs.python.org/issue37288 closed by steve.dower #37290: Mistranslation (Japanese) https://bugs.python.org/issue37290 closed by asvetlov #37299: RuntimeWarning is NOT raised https://bugs.python.org/issue37299 closed by asvetlov #37300: a Py_XINCREF in classobject.c are not necessary https://bugs.python.org/issue37300 closed by benjamin.peterson #37303: Rename parameter name of imghdr what https://bugs.python.org/issue37303 closed by serhiy.storchaka #37304: compiler need support in(de)crement operation or all of it sho https://bugs.python.org/issue37304 closed by steven.daprano #37306: "~/" not working with open() function in posix systems https://bugs.python.org/issue37306 closed by SilentGhost #37312: Remove deprecated _dummy_thread and dummy_threading modules https://bugs.python.org/issue37312 closed by vstinner #37315: Deprecate using math.factorial() with floats https://bugs.python.org/issue37315 closed by serhiy.storchaka #37316: mmap.mmap() passes the wrong variable to PySys_Audit() https://bugs.python.org/issue37316 closed by steve.dower #37318: builtins.True exists but can't be accessed https://bugs.python.org/issue37318 closed by rhettinger #37320: aifc, sunau, wave: remove deprecated openfp() function https://bugs.python.org/issue37320 closed by vstinner #37321: IDLE: Make Subprocess Connection Errors consistent. https://bugs.python.org/issue37321 closed by terry.reedy #37325: IDLE: fix Query subclass tab focus traversal order https://bugs.python.org/issue37325 closed by terry.reedy #37327: python re bug https://bugs.python.org/issue37327 closed by mrabarnett #37331: logging.handlers.DatagramHandler sends bad data to socketserve https://bugs.python.org/issue37331 closed by vinay.sajip #37332: Python from Windows Store cannot install pycrypto https://bugs.python.org/issue37332 closed by zach.ware #37333: Fail build on windows 10(visual studio 2019) https://bugs.python.org/issue37333 closed by steve.dower #37341: str.format and f-string divergence https://bugs.python.org/issue37341 closed by brett.cannon #37342: A type error in typeobj.rst https://bugs.python.org/issue37342 closed by shihai1991 #37343: pip: Warn on vulnerable packages https://bugs.python.org/issue37343 closed by brett.cannon #37356: Name of 64-bit OpenSSL v1.1.1 DLLs https://bugs.python.org/issue37356 closed by philthompson10 #37361: urllib3: TypeError: unsupported operand type(s) for -=: 'Sessi https://bugs.python.org/issue37361 closed by ajung

1 0

_Py_Identifier should support non-ASCII string?
by Inada Naoki June 21, 2019

June 21, 2019

Hi, all. Both of PyUnicdoe_FromString() and _Py_Identifier are supporting UTF-8 for now. We can not change PyUnicode_FromString() for backward compatibility, so we have _PyUnicode_FromASCII instead. But _Py_Identifier is still private. And non-ASCII identifier is not practical. Can we change _PyUnicode_FromId to use _PyUnicode_FromASCII? Regards, -- Inada Naoki <songofacandy(a)gmail.com>

6 10

Who uses libpython38.a on Windows?
by Steve Dower June 20, 2019

June 20, 2019

One of the most annoying steps in building the Windows installers is generating the libpython38.a file. It's annoying, because it requires having "generic enough" MinGW tools to ensure that the file is compatible with whatever version of MinGW might be trying to build against the regular Windows distribution. I would like to stop shipping this file in 3.8 and instead put the steps into the docs to show people how to generate them themselves (with the correct version of their tools): gendef python38.dll > tmp.def dlltool --dllname python38.dll --def tmp.def --output-lib libpython38.a -m i386:x86-64 (Obviously the commands themselves are not complicated if you already have gendef and dlltool, but currently a normal CPython build system does not have these.) Before just doing this, I wanted to put out a request for information: * Do you rely (or know anyone who relies) on libpython38.a on Windows? * Are you able to add the two commands above to your build? If not, why not? Thanks, Steve

3 4

why is not 64-bit installer the default download link for Windows?
by Cosimo Lupo June 19, 2019

June 19, 2019

If one goes to httWhps://www.python.org/downloads <https://www.python.org/downloads> from a Windows browser, the default download URL is for the 32-bit installer instead of the 64-bit one. I wonder why is this still the case? Shouldn't we encourage new Windows users (who may not even know the distinction between the two architectures) to use the 64-bit version of Python, since most likely they can? If this is not the correct forum for this, please let me know where I can direct my question/feature request, thanks. Cosimo -- Cosimo Lupo

14 22

radix tree arena map for obmalloc
by Neil Schemenauer June 19, 2019

June 19, 2019

I've been working on this idea for a couple of days. Tim Peters has being helping me out and I think it has come far enough to get some more feedback. It is not yet a good replacement for the current address_in_range() test. However, performance wise, it is very close. Tim figures we are not done optimizing it yet so maybe it will get better. Code is available on my github branch: https://github.com/nascheme/cpython/tree/obmalloc_radix_tree Tim's "obmalloc-big-pools" is what I have been comparing it to. It seems 8 KB pools are faster than 4 KB. I applied Tim's arena trashing fix (bpo-37257) to both branches. Some rough (--fast) pyperformance benchmark results are below. +-------------------------+---------------------+-----------------------------+ | Benchmark | obmalloc-big-pools | obmalloc_radix | +=========================+=====================+=============================+ | crypto_pyaes | 168 ms | 170 ms: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ | hexiom | 13.7 ms | 13.6 ms: 1.01x faster (-1%) | +-------------------------+---------------------+-----------------------------+ | json_dumps | 15.9 ms | 15.6 ms: 1.02x faster (-2%) | +-------------------------+---------------------+-----------------------------+ | json_loads | 36.9 us | 37.1 us: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ | meteor_contest | 141 ms | 139 ms: 1.02x faster (-2%) | +-------------------------+---------------------+-----------------------------+ | nqueens | 137 ms | 140 ms: 1.02x slower (+2%) | +-------------------------+---------------------+-----------------------------+ | pickle_dict | 26.2 us | 25.9 us: 1.01x faster (-1%) | +-------------------------+---------------------+-----------------------------+ | pickle_list | 3.91 us | 3.94 us: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ | python_startup_no_site | 8.00 ms | 7.78 ms: 1.03x faster (-3%) | +-------------------------+---------------------+-----------------------------+ | regex_dna | 246 ms | 241 ms: 1.02x faster (-2%) | +-------------------------+---------------------+-----------------------------+ | regex_v8 | 29.6 ms | 30.0 ms: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ | richards | 93.9 ms | 92.7 ms: 1.01x faster (-1%) | +-------------------------+---------------------+-----------------------------+ | scimark_fft | 525 ms | 531 ms: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ | scimark_sparse_mat_mult | 6.32 ms | 6.24 ms: 1.01x faster (-1%) | +-------------------------+---------------------+-----------------------------+ | spectral_norm | 195 ms | 198 ms: 1.02x slower (+2%) | +-------------------------+---------------------+-----------------------------+ | sqlalchemy_imperative | 49.5 ms | 50.5 ms: 1.02x slower (+2%) | +-------------------------+---------------------+-----------------------------+ | sympy_expand | 691 ms | 695 ms: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ | unpickle_list | 5.09 us | 5.32 us: 1.04x slower (+4%) | +-------------------------+---------------------+-----------------------------+ | xml_etree_parse | 213 ms | 215 ms: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ | xml_etree_generate | 134 ms | 136 ms: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ | xml_etree_process | 103 ms | 104 ms: 1.01x slower (+1%) | +-------------------------+---------------------+-----------------------------+ Not significant (34): 2to3; chameleon; chaos; deltablue; django_template; dulwich_log; fannkuch; float; go; html5lib; logging_format; logging_silent; logging_simple; mako; nbody; pathlib; pickle; pidigits; python_startup; raytrace; regex_compile; regex_effbot; scimark_lu; scimark_monte_carlo; scimark_sor; sqlalchemy_declarative; sqlite_synth; sympy_integrate; sympy_sum; sympy_str; telco; unpack_sequence; unpickle; xml_etree_iterparse

5 28

How to (best) organize platform dependent blocks of Python code
by Michael June 17, 2019

June 17, 2019

CONCERN: How to organize platform dependent blocks of code POLICY/RECOMMENDATION: (today) seems to be: arbitrary, although sys.platform, seems to be the favorite. * I, as 'python-consumer' was very surprised when I learned that sys.platform is "set" when Python is built - and that platform.system() was the call to make to get the run-time value. And, of course, they answered the "question" - what platform am I 'running' on, quite differently. * There are several - to many - issues in the past where, in one form or another, sys.platform, platform.system(), os.name, and I expect more but cannot think of them atm - used throughout all of Python. * A Python expert (e.g., core-devs) may understand - inherently - when each of these is the best option. As an 'experienced-novice' I am surprised that a "build-time constant" seems to be preference. This preference is not new (maybe platform.system() is "new", and os.name() too broad). * Zooming back to 2012 when "linux3" first appeared this became apparent that the build-time constant of linux2 was making 'things' difficult when the packaging was built on linux3 but running with applications developed on linux2 systems - and early on the move was made to just have "linux" returned (issue13236). For years the recommendation was (and maybe is?) to use sys.platform.startswith('linux'). * In between there have been other discussions - and the concern remains unresolved. * Personally, not "satisfied", and reluctant to "give up", or "ignore" something that continues to come up - I opened issue36624 to serve as a discussion point and worked through what would be needed to have "most" platforms testing against a CONSTANT defined in test.support - to provide an example of what it could look like. * As a non-expert - I EXPECT guidance from the people who know best why and when the different approaches are preferred. (I am hoping for something better than 'historical' or 'personal preferences'). * So, using this mail to python-dev to re-open the discussion - my suggested focus is NOT look at specific (test) code as it is now, but FOCUS from a perspective of Python3 and beyond - answering the 'concern' how should 'platform dependencies' be organized'. In other words, do not focus on an exception (although "listing" perceived exceptions will be helpful). Focus on "policy" aka "good practice". With that as a starting point discussing, understanding and validating exceptions to the guidelines will be much easier. -- as a 'mentoring' project - I am willing to do as much as I am able to "implement" something. My first PR was a 'stab in the dark' and I have already learned "other things" such as how to git rebase (read merge!). The discussion in the issue-tracker and PR conversation indicate to me that documentation of different approaches to organizing code dependencies is vital. And that it is not easily available. Devguide is one area - but 'core' documentation is more important imho - I read, and compare, the Python documentation much much more often than the devguide docs. Sincerely, Michael

3 2

Summary of Python tracker Issues
by Python tracker June 14, 2019

June 14, 2019

ACTIVITY SUMMARY (2019-06-07 - 2019-06-14) 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 7022 (+15) closed 42013 (+70) total 49035 (+85) Open issues with patches: 2826 Issues opened (54) ================== #36607: asyncio.all_tasks() crashes if asyncio is used in multiple thr https://bugs.python.org/issue36607 reopened by asvetlov #36888: Create a way to check that the parent process is alive for dea https://bugs.python.org/issue36888 reopened by vstinner #37136: Travis CI: Documentation tests fails with Sphinx 2.1 https://bugs.python.org/issue37136 reopened by njs #37200: PyType_GenericAlloc might over-allocate memory https://bugs.python.org/issue37200 opened by nascheme #37201: fix test_distutils failures for Windows ARM64 https://bugs.python.org/issue37201 opened by Paul Monson #37205: time.perf_counter() is not system-wide on Windows, in disagree https://bugs.python.org/issue37205 opened by kh90909 #37206: Incorrect application of Argument Clinic to dict.pop() https://bugs.python.org/issue37206 opened by rhettinger #37207: Use PEP 590 vectorcall to speed up calls to range(), list() an https://bugs.python.org/issue37207 opened by Mark.Shannon #37208: Weird exception behaviour in ProcessPoolExecutor https://bugs.python.org/issue37208 opened by Iceflower #37209: Add what's new entries for pickle enhancements https://bugs.python.org/issue37209 opened by pitrou #37211: obmalloc: eliminate limit on pool size https://bugs.python.org/issue37211 opened by tim.peters #37212: ordered keyword arguments in unittest.mock.call repr and error https://bugs.python.org/issue37212 opened by xtreak #37214: Add new EncodingWarning warning category: emitted when the loc https://bugs.python.org/issue37214 opened by vstinner #37218: Default hmac.new() digestmod has not been removed from documen https://bugs.python.org/issue37218 opened by Alex.Willmer #37220: test_idle crash on Windows 2.7 when run with -R: https://bugs.python.org/issue37220 opened by zach.ware #37221: PyCode_New API change breaks backwards compatibility policy https://bugs.python.org/issue37221 opened by ncoghlan #37222: urllib missing voidresp breaks CacheFTPHandler https://bugs.python.org/issue37222 opened by danh #37224: test__xxsubinterpreters failed on AMD64 Windows8.1 Refleaks 3. https://bugs.python.org/issue37224 opened by vstinner #37225: Document BaseException constructor https://bugs.python.org/issue37225 opened by Hong Xu #37226: Asyncio Fatal Error on SSL Transport - IndexError Deque Index https://bugs.python.org/issue37226 opened by ben.brown #37228: UDP sockets created by create_datagram_endpoint() allow by def https://bugs.python.org/issue37228 opened by Jukka Väisänen #37231: Optimize calling special methods https://bugs.python.org/issue37231 opened by jdemeyer #37232: Parallel compilation fails because of low ulimit. https://bugs.python.org/issue37232 opened by kulikjak #37233: Use _PY_FASTCALL_SMALL_STACK for method_vectorcall https://bugs.python.org/issue37233 opened by jdemeyer #37235: urljoin behavior unclear/not following RFC 3986 https://bugs.python.org/issue37235 opened by Matthew Kenigsberg #37236: fix test_complex for Windows arm64 https://bugs.python.org/issue37236 opened by Paul Monson #37237: python 2.16 from source on Ubuntu 18.04 https://bugs.python.org/issue37237 opened by Jilguero ostras #37242: sub-process would be terminated when registered finalizers ar https://bugs.python.org/issue37242 opened by mrqianjinsi #37243: test_sendfile in asyncio crashes when os.sendfile() is not sup https://bugs.python.org/issue37243 opened by Michael.Felt #37244: test_multiprocessing_forkserver: test_resource_tracker() faile https://bugs.python.org/issue37244 opened by vstinner #37245: Azure Pipeline 3.8 CI: multiple tests hung and timed out on ma https://bugs.python.org/issue37245 opened by vstinner #37246: http.cookiejar.DefaultCookiePolicy should use current timestam https://bugs.python.org/issue37246 opened by xtreak #37247: swap distutils build_ext and build_py commands to allow proper https://bugs.python.org/issue37247 opened by jlvandenhout #37248: support conversion of `func(**{} if a else b)` https://bugs.python.org/issue37248 opened by Shen Han #37250: C files generated by Cython set tp_print to NULL: PyTypeObject https://bugs.python.org/issue37250 opened by vstinner #37251: Mocking a MagicMock with a function spec results in an AsyncMo https://bugs.python.org/issue37251 opened by jcline #37252: devpoll test failures on Solaris https://bugs.python.org/issue37252 opened by kulikjak #37254: POST large file to server (using http.server.CGIHTTPRequestHan https://bugs.python.org/issue37254 opened by shajianrui #37256: urllib.request.Request documentation erroneously refers to the https://bugs.python.org/issue37256 opened by Alan De Smet #37258: Logging cache not cleared properly when setting level https://bugs.python.org/issue37258 opened by David Wang #37260: shutil.rmtree() FileNotFoundError race condition https://bugs.python.org/issue37260 opened by Jeffrey.Kintscher #37263: spawn asyncio subprocesses in a thread pool https://bugs.python.org/issue37263 opened by asvetlov #37267: os.dup() creates an inheritable fd when handling a character f https://bugs.python.org/issue37267 opened by ZackerySpytz #37268: Deprecate the parser module https://bugs.python.org/issue37268 opened by vstinner #37270: Manage memory lifetime for all type-related objects. https://bugs.python.org/issue37270 opened by llllllllll #37271: Make multiple passes of the peephole optimizer until bytecode https://bugs.python.org/issue37271 opened by pablogsal #37274: Scripts folder is empty in python 3.7.3 for windows. https://bugs.python.org/issue37274 opened by Hansol Moon #37275: GetConsole(Output)CP is used even when stdin/stdout is redirec https://bugs.python.org/issue37275 opened by inada.naoki #37276: Incorrect number of running calls in ProcessPoolExecutor https://bugs.python.org/issue37276 opened by maggyero #37277: http.cookies.SimpleCookie does not parse attribute without val https://bugs.python.org/issue37277 opened by sirkonst #37279: asyncio sendfile sends extra data in the last chunk in fallbac https://bugs.python.org/issue37279 opened by asvetlov #37280: Use threadpool for reading from file for sendfile fallback mod https://bugs.python.org/issue37280 opened by asvetlov #37283: Unexpected behavior when running installer a second time with https://bugs.python.org/issue37283 opened by Jörn Jacobi #37284: Not obvious that new required attrs of sys.implementation must https://bugs.python.org/issue37284 opened by eric.snow Most recent 15 issues with no replies (15) ========================================== #37284: Not obvious that new required attrs of sys.implementation must https://bugs.python.org/issue37284 #37280: Use threadpool for reading from file for sendfile fallback mod https://bugs.python.org/issue37280 #37279: asyncio sendfile sends extra data in the last chunk in fallbac https://bugs.python.org/issue37279 #37276: Incorrect number of running calls in ProcessPoolExecutor https://bugs.python.org/issue37276 #37271: Make multiple passes of the peephole optimizer until bytecode https://bugs.python.org/issue37271 #37270: Manage memory lifetime for all type-related objects. https://bugs.python.org/issue37270 #37263: spawn asyncio subprocesses in a thread pool https://bugs.python.org/issue37263 #37260: shutil.rmtree() FileNotFoundError race condition https://bugs.python.org/issue37260 #37254: POST large file to server (using http.server.CGIHTTPRequestHan https://bugs.python.org/issue37254 #37252: devpoll test failures on Solaris https://bugs.python.org/issue37252 #37246: http.cookiejar.DefaultCookiePolicy should use current timestam https://bugs.python.org/issue37246 #37244: test_multiprocessing_forkserver: test_resource_tracker() faile https://bugs.python.org/issue37244 #37243: test_sendfile in asyncio crashes when os.sendfile() is not sup https://bugs.python.org/issue37243 #37242: sub-process would be terminated when registered finalizers ar https://bugs.python.org/issue37242 #37235: urljoin behavior unclear/not following RFC 3986 https://bugs.python.org/issue37235 Most recent 15 issues waiting for review (15) ============================================= #37280: Use threadpool for reading from file for sendfile fallback mod https://bugs.python.org/issue37280 #37279: asyncio sendfile sends extra data in the last chunk in fallbac https://bugs.python.org/issue37279 #37271: Make multiple passes of the peephole optimizer until bytecode https://bugs.python.org/issue37271 #37270: Manage memory lifetime for all type-related objects. https://bugs.python.org/issue37270 #37267: os.dup() creates an inheritable fd when handling a character f https://bugs.python.org/issue37267 #37260: shutil.rmtree() FileNotFoundError race condition https://bugs.python.org/issue37260 #37252: devpoll test failures on Solaris https://bugs.python.org/issue37252 #37250: C files generated by Cython set tp_print to NULL: PyTypeObject https://bugs.python.org/issue37250 #37247: swap distutils build_ext and build_py commands to allow proper https://bugs.python.org/issue37247 #37243: test_sendfile in asyncio crashes when os.sendfile() is not sup https://bugs.python.org/issue37243 #37236: fix test_complex for Windows arm64 https://bugs.python.org/issue37236 #37233: Use _PY_FASTCALL_SMALL_STACK for method_vectorcall https://bugs.python.org/issue37233 #37231: Optimize calling special methods https://bugs.python.org/issue37231 #37222: urllib missing voidresp breaks CacheFTPHandler https://bugs.python.org/issue37222 #37221: PyCode_New API change breaks backwards compatibility policy https://bugs.python.org/issue37221 Top 10 most discussed issues (10) ================================= #37250: C files generated by Cython set tp_print to NULL: PyTypeObject https://bugs.python.org/issue37250 25 msgs #37221: PyCode_New API change breaks backwards compatibility policy https://bugs.python.org/issue37221 19 msgs #37226: Asyncio Fatal Error on SSL Transport - IndexError Deque Index https://bugs.python.org/issue37226 10 msgs #19645: decouple unittest assertions from the TestCase class https://bugs.python.org/issue19645 9 msgs #37176: super() docs don't say what super() does https://bugs.python.org/issue37176 9 msgs #37130: pathlib.Path.with_name() handles '.' and '..' inconsistently https://bugs.python.org/issue37130 7 msgs #37172: Odd error awaiting a Future https://bugs.python.org/issue37172 7 msgs #37195: test_utime fails on MacOS Mojave (Kernel Version 18.6.0:) https://bugs.python.org/issue37195 7 msgs #26806: IDLE not displaying RecursionError tracebacks and hangs https://bugs.python.org/issue26806 6 msgs #29505: Submit the re, json, & csv modules to oss-fuzz testing https://bugs.python.org/issue29505 6 msgs Issues closed (70) ================== #11122: bdist_rpm should use rpmbuild, not rpm https://bugs.python.org/issue11122 closed by cheryl.sabella #18355: Merge super() guide into documentation https://bugs.python.org/issue18355 closed by rhettinger #19865: create_unicode_buffer() fails on non-BMP strings on Windows https://bugs.python.org/issue19865 closed by vstinner #24412: setUpClass equivalent for addCleanup https://bugs.python.org/issue24412 closed by lisroach #25599: asyncio.iscoroutinefunction returns unexpected results when pr https://bugs.python.org/issue25599 closed by xtreak #33071: Document that PyPI no longer requires 'register' https://bugs.python.org/issue33071 closed by cheryl.sabella #33758: Unexpected success of test_get_type_hints_modules_forwardref https://bugs.python.org/issue33758 closed by benjamin.peterson #34467: No mechanism to abort created coroutine or suppress not-awaite https://bugs.python.org/issue34467 closed by asvetlov #34520: test_asyncio leaked [2, 2, 2] references, sum=6 in AMD64 Windo https://bugs.python.org/issue34520 closed by vstinner #34677: Event scheduler page example https://bugs.python.org/issue34677 closed by cheryl.sabella #34886: subprocess.run throws exception when input and stdin are passe https://bugs.python.org/issue34886 closed by gregory.p.smith #35070: test_getgrouplist may fail on macOS if user in too many groups https://bugs.python.org/issue35070 closed by ned.deily #35184: Makefile is not correctly generated when compiling pyextat wit https://bugs.python.org/issue35184 closed by benjamin.peterson #35385: time module: why not using tzname from the glibc? https://bugs.python.org/issue35385 closed by vstinner #35425: test_eintr fails randomly on AMD64 FreeBSD 10-STABLE Non-Debug https://bugs.python.org/issue35425 closed by vstinner #35462: test_imaplib.test_enable_UTF8_True_append() failed on AMD64 Fr https://bugs.python.org/issue35462 closed by vstinner #35586: Open pyexpat compilation, Make shows error（missing separator https://bugs.python.org/issue35586 closed by benjamin.peterson #35876: test_start_new_session for posix_spawnp fails https://bugs.python.org/issue35876 closed by vstinner #35998: test_asyncio: test_start_tls_server_1() TimeoutError on Fedora https://bugs.python.org/issue35998 closed by asvetlov #36402: threading._shutdown() race condition: test_threading test_thre https://bugs.python.org/issue36402 closed by vstinner #36548: Make the repr of re flags more readable https://bugs.python.org/issue36548 closed by serhiy.storchaka #36631: test_urllib2net: test_ftp_no_timeout() killed after a timeout https://bugs.python.org/issue36631 closed by vstinner #36779: time.tzname returns empty string on Windows if default codepag https://bugs.python.org/issue36779 closed by Paul Monson #36905: test_typing.GetTypeHintTests.test_get_type_hints_modules_forwa https://bugs.python.org/issue36905 closed by benjamin.peterson #36918: ValueError warning in test_urllib due to io.IOBase destructor https://bugs.python.org/issue36918 closed by vstinner #37038: Make idlelib/run.py runnable. https://bugs.python.org/issue37038 closed by terry.reedy #37077: Threading: add builtin TID attribute to Thread objects for AIX https://bugs.python.org/issue37077 closed by asvetlov #37081: Test with OpenSSL 1.1.1c https://bugs.python.org/issue37081 closed by asvetlov #37138: PEP 590 method_vectorcall calls memcpy with NULL src https://bugs.python.org/issue37138 closed by gregory.p.smith #37150: Do not allow to pass FileType class object instead of instance https://bugs.python.org/issue37150 closed by asvetlov #37154: test_utf8_mode: test_env_var() fails on AMD64 Fedora Rawhide C https://bugs.python.org/issue37154 closed by vstinner #37160: thread native id netbsd support https://bugs.python.org/issue37160 closed by vstinner #37173: inspect.getfile error names module instead of passed class https://bugs.python.org/issue37173 closed by asvetlov #37178: One argument form of math.perm() https://bugs.python.org/issue37178 closed by rhettinger #37188: Creating a ctypes array of an element with size zero causes "F https://bugs.python.org/issue37188 closed by skrah #37191: Python.h contains intermingled declarations https://bugs.python.org/issue37191 closed by vstinner #37202: Future.cancelled is not set to true immediately after calling https://bugs.python.org/issue37202 closed by asvetlov #37203: Correct classmethod emulation in Descriptor HowTo Guide https://bugs.python.org/issue37203 closed by rhettinger #37204: Scripts and binaries in PYTHON_PREFIX/Scripts contain unnecess https://bugs.python.org/issue37204 closed by steve.dower #37210: Pure Python pickle module should not depend on _pickle.PickleB https://bugs.python.org/issue37210 closed by pitrou #37213: Peeephole optimizer does not optimize functions with multiline https://bugs.python.org/issue37213 closed by pablogsal #37215: Build with dtrace is broken on some systems https://bugs.python.org/issue37215 closed by kulikjak #37216: "Using Python on a Macintosh" chapter of "Python Setup and Usa https://bugs.python.org/issue37216 closed by ned.deily #37217: SSL socket segfaults during a connect() using a punycode domai https://bugs.python.org/issue37217 closed by christian.heimes #37219: empty set difference does not check types of values https://bugs.python.org/issue37219 closed by rhettinger #37223: test_io logs Exception ignored in: <function IOBase.__del__ at https://bugs.python.org/issue37223 closed by vstinner #37227: Wrong parse long argument https://bugs.python.org/issue37227 closed by eric.smith #37229: bisect: Allow a custom compare function https://bugs.python.org/issue37229 closed by rhettinger #37230: spam https://bugs.python.org/issue37230 closed by xtreak #37234: error in variable https://bugs.python.org/issue37234 closed by steve.dower #37238: Enable building for Windows using Visual Studio 2019 https://bugs.python.org/issue37238 closed by steve.dower #37239: Add headless development preset layout https://bugs.python.org/issue37239 closed by Paul Monson #37240: Filename http.py breaks calls to urllib https://bugs.python.org/issue37240 closed by eric.smith #37241: Item Count Error in Shelf https://bugs.python.org/issue37241 closed by SilentGhost #37249: Missing declaration of _PyObject_GetMethod https://bugs.python.org/issue37249 closed by inada.naoki #37253: PyCompilerFlags got a new cf_feature_version field https://bugs.python.org/issue37253 closed by vstinner #37255: Pathlib: Add an expandUserPath method or argument https://bugs.python.org/issue37255 closed by Andrea Moro #37257: obmalloc: stop simple arena thrashing https://bugs.python.org/issue37257 closed by tim.peters #37259: Missing Doc/whatsnew/3.9.rst file https://bugs.python.org/issue37259 closed by ned.deily #37261: test_io leaks references on AMD64 Fedora Rawhide Refleaks 3.8 https://bugs.python.org/issue37261 closed by vstinner #37262: Make unittest assertions staticmethods/classmethods https://bugs.python.org/issue37262 closed by rbcollins #37264: Python 3.7.3 win 64bit - unresolved external symbol PyOS_After https://bugs.python.org/issue37264 closed by steve.dower #37265: Memory leaks regression caused by: Fix threading._shutdown() r https://bugs.python.org/issue37265 closed by vstinner #37266: Daemon threads must be forbidden in subinterpreters https://bugs.python.org/issue37266 closed by vstinner #37269: Python 3.8b1 miscompiles conditional expressions containing __ https://bugs.python.org/issue37269 closed by pablogsal #37272: pygit2 won't build https://bugs.python.org/issue37272 closed by xtreak #37273: from pickle import rick https://bugs.python.org/issue37273 closed by steven.daprano #37278: test_asyncio: ProactorLoopCtrlC leaks one reference https://bugs.python.org/issue37278 closed by vstinner #37281: asyncio Task._fut_waiter done callback https://bugs.python.org/issue37281 closed by Валентин Бурченя #37282: os problems on absolute paths containing unicode characters on https://bugs.python.org/issue37282 closed by Jonatã Bolzan Loss

1 0

Expected stability of PyCode_New() and types.CodeType() signatures
by Petr Viktorin June 13, 2019

June 13, 2019

Hello, PEP 570 (Positional-Only Parameters) changed the signatures of PyCode_New() and types.CodeType(), adding a new argument for "posargcount". Our policy for such changes seems to be fragmented tribal knowledge. I'm writing to check if my understanding is reasonable, so I can apply it and document it explicitly. There is a surprisingly large ecosystem of tools that create code objects. The expectation seems to be that these tools will need to be adapted for each minor version of Python. But that's not the same as saying that if you use types.CodeType(), you're on your own. To me [PR 13271], seems to go too far when it adds: > These types are not supposed to be instantiated outside of > CPython internals and constructor signatures will vary > between Python versions. This kind of "washing our hands" doesn't do justice to tools like Cython, whose use of PyCode_New is (IMO) perfectly justified. As is adapting to Python minor versions. So, we should document the changes as any backwards-incompatible change. Specifically, changes should be (or should have been, in hindsight) mentioned in: * The "API changes" and/or "Porting" sections of the What's New document * Version history of the documentation (e.g. versionchanged blocks) * Any relevant PEPs Also, the expected level of API stability should be documented in the docs. Does that sound right? PEP 570: https://www.python.org/dev/peps/pep-0570/ PyCode_New: https://docs.python.org/3.8/c-api/code.html#c.PyCode_New [PR 13271]: https://github.com/python/cpython/pull/13271/files

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