Mailman 3 July 2018 - Python-Dev

Re: [Python-Dev] PEP 576/579/580 benchmark: mistune
by Jeroen Demeyer July 30, 2018

July 30, 2018

On 2018-07-30 13:11, INADA Naoki wrote: > Like previous SageMath bench, this is caused by Cython's > specialization; __Pyx_PyObject_CallOneArg. > > It specializing calling PyFunction and PyCFunction, but it doesn't > specialized for calling CyFunction. Yes, I saw that too. But this is exactly what CPython does (it optimizes PyFunction and PyCFunction but not CyFunction), so I would still argue that the benchmark is fair.

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Re: [Python-Dev] Let's change to C API!
by Jeroen Demeyer July 30, 2018

July 30, 2018

My first impression is that making things faster and hiding implementation details in the ABI are contrary goals. I agree with hiding implementation details in the API but not in the ABI. For example, you mention that you want to make Py_INCREF() a function call instead of a macro. But since Py_INCREF is very common, I would guess that this would make performance worse (not by much maybe but surely measurable). Jeroen.

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PEP 576/579/580 benchmark: mistune
by Jeroen Demeyer July 30, 2018

July 30, 2018

Hello all, since my latest benchmark for PEP 580 [1] involved SageMath, which is quite a big project, I instead propose a much simpler benchmark involving mistune. mistune [2] is a Markdown parser implemented in the Python language. It optionally allows Cython compilation. It doesn't use any kind of optimization beyond that, but I created a branch [3] to use extension types instead of Python classes. Cython can either use built-in functions/methods or a custom class (which is not optimized but which would be optimized with PEP 580). I benchmarked mistune with custom classes [3] (binding=True, the default) and with built-in functions/methods [4] (binding=False). This is the median time of 5 runs: Binding=True: 9.063s Binding=False: 8.658s So this shows again that PEP 580 improves performance in actual real-world use cases. Jeroen. [1] https://mail.python.org/pipermail/python-dev/2018-July/154740.html [2] https://github.com/lepture/mistune [3] https://github.com/jdemeyer/mistune/tree/cython_pxd [4] https://github.com/jdemeyer/mistune/tree/cython_pxd_nobinding

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Using Python on a fork-less POSIX-like OS
by Barath Aron July 30, 2018

July 30, 2018

Hello Python list, I intend to cross-compile Python v3.6.6 to Threos ( https://threos.io ) operating system. Threos is supports a quite large set from POSIX and C89/C99. Unfortunately, Threos lacks fork(2), but provides posix_spawn(3) instead. I already made some local changes in posixmodule.c to compile due to some features are detected as present but actually not supported, like HAVE_FORK -- I blame autotools for this :-). I don't know, however, whether the Python shall cross-compile without issues. My question is that the _posixsubprocess.c can be prepared to use posix_spawn(3) instead of fork(2)? Maybe the UNIX/Linux version can also benefit from it, see: https://salsa.debian.org/ruby-team/ruby-posix-spawn Best regards, Aron

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Re: [Python-Dev] [Python-checkins] bpo-34239: Convert test_bz2 to use tempfile (#8485)
by Chris Jerdonek July 29, 2018

July 29, 2018

On Thu, Jul 26, 2018 at 2:05 PM, Tim Golden <webhook-mailer(a)python.org> wrote: > https://github.com/python/cpython/commit/6a62e1d365934de82ff7c634981b3fbf21… > commit: 6a62e1d365934de82ff7c634981b3fbf218b4d5f > branch: master > author: Tim Golden <mail(a)timgolden.me.uk> > committer: GitHub <noreply(a)github.com> > date: 2018-07-26T22:05:00+01:00 > summary: > > bpo-34239: Convert test_bz2 to use tempfile (#8485) > > * bpo-34239: Convert test_bz2 to use tempfile > > test_bz2 currently uses the test.support.TESTFN functionality which creates a temporary file local to the test directory named around the pid. > > This can give rise to race conditions where tests are competing with each other to delete and recreate the file. Per the other thread-- https://mail.python.org/pipermail/python-dev/2018-July/154762.html this seems like a wrong statement of the problem as tests are properly cleaning up after themselves. The leading hypothesis is that unrelated Windows processes are delaying the deletion (e.g. virus scanners). --Chris > > This change converts the tests to use tempfile.mkstemp which gives a different file every time from the system's temp area > > files: > M Lib/test/test_bz2.py > > diff --git a/Lib/test/test_bz2.py b/Lib/test/test_bz2.py > index 003497f28b16..e62729a5a2f8 100644 > --- a/Lib/test/test_bz2.py > +++ b/Lib/test/test_bz2.py > @@ -6,6 +6,7 @@ > import os > import pickle > import glob > +import tempfile > import pathlib > import random > import shutil > @@ -76,11 +77,14 @@ class BaseTest(unittest.TestCase): > BIG_DATA = bz2.compress(BIG_TEXT, compresslevel=1) > > def setUp(self): > - self.filename = support.TESTFN > + fd, self.filename = tempfile.mkstemp() > + os.close(fd) > > def tearDown(self): > - if os.path.isfile(self.filename): > + try: > os.unlink(self.filename) > + except FileNotFoundError: > + pass > > > class BZ2FileTest(BaseTest): > > _______________________________________________ > Python-checkins mailing list > Python-checkins(a)python.org > https://mail.python.org/mailman/listinfo/python-checkins

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Exporting Python functions on AIX
by WILSON, MICHAEL July 27, 2018

July 27, 2018

All, My excuse if this is not the appropriate list for a question essentially concerning the AIX port of Python. The current port of Python for AIX includes composing an export file (/lib/python2.7/config/python.exp) in which there are a number of functions starting "Py_" or "_Py_". The Vim package for AIX is built referencing the python.exp file and unfortunately, when functions are removed from libpython, even those which are not called, the vim command detects missing symbols. The most recent case (May 2017), functions _Py_hgidentity, _Py_hgversion and _Py_svnversion were replaced/removed, see "bpo-27593: Get SCM build info from git instead of hg (#1327)". Is it correct to assume that the "_Py_" functions are internal (Python name space) that should/must not be called by or made visible to application code ? Could you indicate a URL to the authoritative API documentation ? Thanks for your replies. Mike Wilson

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Summary of Python tracker Issues
by Python tracker July 27, 2018

July 27, 2018

ACTIVITY SUMMARY (2018-07-20 - 2018-07-27) Python tracker at https://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 6740 ( +6) closed 39260 (+73) total 46000 (+79) Open issues with patches: 2681 Issues opened (50) ================== #34126: Profiling certain invalid calls crashes Python https://bugs.python.org/issue34126 reopened by vstinner #34157: NamedTemporaryFile can leave temporary files behind https://bugs.python.org/issue34157 reopened by r.david.murray #34171: Lib/trace.cover not removed by the clean target https://bugs.python.org/issue34171 opened by doko #34172: multiprocessing.Pool and ThreadPool leak resources after being https://bugs.python.org/issue34172 opened by tzickel #34173: [3.7] deadlock in /usr/lib/python3.7/concurrent/futures/thread https://bugs.python.org/issue34173 opened by corey.bryant #34176: Asyncio StreamReader fails to close Transport https://bugs.python.org/issue34176 opened by JDLH #34178: test_tcl fails on the 3.7 branch https://bugs.python.org/issue34178 opened by doko #34182: Lib/test/test_pydoc.py failed when ran as a script https://bugs.python.org/issue34182 opened by serhiy.storchaka #34185: Lib/test/test_bdb.py failed when ran as a script https://bugs.python.org/issue34185 opened by serhiy.storchaka #34187: Issues with lazy fd support in _WindowsConsoleIO fileno() and https://bugs.python.org/issue34187 opened by eryksun #34188: Allow dict choices to "transform" values in argpagse https://bugs.python.org/issue34188 opened by porton #34191: argparse: Missing subparser error message should be more clear https://bugs.python.org/issue34191 opened by porton #34192: FunctionType.__new__ can generate functions that immediately c https://bugs.python.org/issue34192 opened by bup #34193: Fix pluralization in TypeError messages in getargs.c https://bugs.python.org/issue34193 opened by xtreak #34194: test_ssl, AIX, and defaults for _ssl connections https://bugs.python.org/issue34194 opened by Michael.Felt #34198: Additional encoding options to tkinter.filedialog https://bugs.python.org/issue34198 opened by narito #34199: Add support for delete logger in log module. https://bugs.python.org/issue34199 opened by chetankolhe #34200: importlib: python -m test test_pkg -m test_7 fails randomly https://bugs.python.org/issue34200 opened by vstinner #34203: documentation: recommend Python 3 over 2 in faq https://bugs.python.org/issue34203 opened by abcdef #34204: Bump the default pickle protocol in shelve https://bugs.python.org/issue34204 opened by serhiy.storchaka #34205: Ansible: _PyImport_LoadDynamicModuleWithSpec() crash on an inv https://bugs.python.org/issue34205 opened by mdk #34206: Move and clarify Py_Main documentation https://bugs.python.org/issue34206 opened by ncoghlan #34207: test_cmd_line test_utf8_mode test_warnings fail in AMD64 FreeB https://bugs.python.org/issue34207 opened by pablogsal #34211: Cygwin build broken due to use of &PyType_Type in static decla https://bugs.python.org/issue34211 opened by erik.bray #34212: Cygwin link failure with builtin modules since issue30860 https://bugs.python.org/issue34212 opened by erik.bray #34213: Frozen dataclass __init__ fails for "object" property" https://bugs.python.org/issue34213 opened by Omenien #34214: Pylint recusion stack overflow abort https://bugs.python.org/issue34214 opened by nickdrozd #34215: streams.py:readuntil IncompleteReadError is message is incorre https://bugs.python.org/issue34215 opened by mrbell321(a)gmail.com #34216: python platform no child error https://bugs.python.org/issue34216 opened by sskamble619 #34219: distutils: build_ext -D wrongly assume defining a symbol with https://bugs.python.org/issue34219 opened by monson #34222: Email message serialization enters an infinite loop when foldi https://bugs.python.org/issue34222 opened by altvod #34223: PYTHONDUMPREFS=1 ./python -c pass does crash https://bugs.python.org/issue34223 opened by vstinner #34224: python 3.7 inside venv tries to write back to read-only instal https://bugs.python.org/issue34224 opened by ajung #34226: cgi.parse_multipart() requires undocumented CONTENT-LENGTH in https://bugs.python.org/issue34226 opened by yan12125 #34231: PYTHONBREAKPOINT is not documented with python --help https://bugs.python.org/issue34231 opened by matrixise #34232: Python3.7.0 exe installers (32 and 64 bit) failing on Windows7 https://bugs.python.org/issue34232 opened by wolma #34234: Use _PyAnyInt_Check() and _PyAnyInt_CheckExact() in 2.7 https://bugs.python.org/issue34234 opened by serhiy.storchaka #34235: PyArg_ParseTupleAndKeywords: support required keyword argument https://bugs.python.org/issue34235 opened by serhiy.storchaka #34236: Test6012 in test_capi is not run as part of make test https://bugs.python.org/issue34236 opened by xtreak #34238: When BROWSER is set on Mac webbrowser.register_standard_browse https://bugs.python.org/issue34238 opened by ograycode #34239: Convert test_bz2 to use tempfile https://bugs.python.org/issue34239 opened by tim.golden #34240: Convert test_mmap to use tempfile https://bugs.python.org/issue34240 opened by tim.golden #34242: configparser: SectionProxy.get is silent on missing options https://bugs.python.org/issue34242 opened by Stig Johan Berggren #34243: pty.spawn: inconsistent interface https://bugs.python.org/issue34243 opened by statix #34244: Add support of check logger https://bugs.python.org/issue34244 opened by chetankolhe #34245: Python library should be installed writable https://bugs.python.org/issue34245 opened by jdemeyer #34246: Gentoo Refleaks 3.7: test_smtplib has dangling threads https://bugs.python.org/issue34246 opened by pablogsal #34247: PYTHONOPTIMZE ignored in 3.7.0 when using custom launcher https://bugs.python.org/issue34247 opened by ronaldoussoren #34248: dbm errors should contain file names https://bugs.python.org/issue34248 opened by sam-s #34249: Full set of format codes applies to strftime only https://bugs.python.org/issue34249 opened by v kats Most recent 15 issues with no replies (15) ========================================== #34248: dbm errors should contain file names https://bugs.python.org/issue34248 #34247: PYTHONOPTIMZE ignored in 3.7.0 when using custom launcher https://bugs.python.org/issue34247 #34244: Add support of check logger https://bugs.python.org/issue34244 #34243: pty.spawn: inconsistent interface https://bugs.python.org/issue34243 #34236: Test6012 in test_capi is not run as part of make test https://bugs.python.org/issue34236 #34235: PyArg_ParseTupleAndKeywords: support required keyword argument https://bugs.python.org/issue34235 #34232: Python3.7.0 exe installers (32 and 64 bit) failing on Windows7 https://bugs.python.org/issue34232 #34226: cgi.parse_multipart() requires undocumented CONTENT-LENGTH in https://bugs.python.org/issue34226 #34222: Email message serialization enters an infinite loop when foldi https://bugs.python.org/issue34222 #34219: distutils: build_ext -D wrongly assume defining a symbol with https://bugs.python.org/issue34219 #34216: python platform no child error https://bugs.python.org/issue34216 #34215: streams.py:readuntil IncompleteReadError is message is incorre https://bugs.python.org/issue34215 #34214: Pylint recusion stack overflow abort https://bugs.python.org/issue34214 #34212: Cygwin link failure with builtin modules since issue30860 https://bugs.python.org/issue34212 #34211: Cygwin build broken due to use of &PyType_Type in static decla https://bugs.python.org/issue34211 Most recent 15 issues waiting for review (15) ============================================= #34249: Full set of format codes applies to strftime only https://bugs.python.org/issue34249 #34245: Python library should be installed writable https://bugs.python.org/issue34245 #34242: configparser: SectionProxy.get is silent on missing options https://bugs.python.org/issue34242 #34240: Convert test_mmap to use tempfile https://bugs.python.org/issue34240 #34239: Convert test_bz2 to use tempfile https://bugs.python.org/issue34239 #34234: Use _PyAnyInt_Check() and _PyAnyInt_CheckExact() in 2.7 https://bugs.python.org/issue34234 #34231: PYTHONBREAKPOINT is not documented with python --help https://bugs.python.org/issue34231 #34219: distutils: build_ext -D wrongly assume defining a symbol with https://bugs.python.org/issue34219 #34213: Frozen dataclass __init__ fails for "object" property" https://bugs.python.org/issue34213 #34212: Cygwin link failure with builtin modules since issue30860 https://bugs.python.org/issue34212 #34211: Cygwin build broken due to use of &PyType_Type in static decla https://bugs.python.org/issue34211 #34206: Move and clarify Py_Main documentation https://bugs.python.org/issue34206 #34198: Additional encoding options to tkinter.filedialog https://bugs.python.org/issue34198 #34193: Fix pluralization in TypeError messages in getargs.c https://bugs.python.org/issue34193 #34182: Lib/test/test_pydoc.py failed when ran as a script https://bugs.python.org/issue34182 Top 10 most discussed issues (10) ================================= #34170: Py_Initialize(): computing path configuration must not have si https://bugs.python.org/issue34170 12 msgs #34172: multiprocessing.Pool and ThreadPool leak resources after being https://bugs.python.org/issue34172 10 msgs #34115: code.InteractiveConsole.interact() closes stdin https://bugs.python.org/issue34115 7 msgs #34246: Gentoo Refleaks 3.7: test_smtplib has dangling threads https://bugs.python.org/issue34246 7 msgs #29710: Incorrect representation caveat on bitwise operation docs https://bugs.python.org/issue29710 6 msgs #34154: Tkinter __init__ documentations sometimes missing valid keywor https://bugs.python.org/issue34154 6 msgs #34173: [3.7] deadlock in /usr/lib/python3.7/concurrent/futures/thread https://bugs.python.org/issue34173 6 msgs #29750: smtplib doesn't handle unicode passwords https://bugs.python.org/issue29750 5 msgs #33089: Add multi-dimensional Euclidean distance function to the math https://bugs.python.org/issue33089 5 msgs #34178: test_tcl fails on the 3.7 branch https://bugs.python.org/issue34178 5 msgs Issues closed (68) ================== #12743: C API marshalling doc contains XXX https://bugs.python.org/issue12743 closed by berker.peksag #13041: argparse: terminal width is not detected properly https://bugs.python.org/issue13041 closed by berker.peksag #15127: Supressing warnings with -w "whether gcc supports ParseTuple" https://bugs.python.org/issue15127 closed by serhiy.storchaka #20260: Argument Clinic: add unsigned integers converters https://bugs.python.org/issue20260 closed by serhiy.storchaka #21446: Update reload fixer to use importlib instead of imp https://bugs.python.org/issue21446 closed by berker.peksag #21826: Performance issue (+fix) AIX ctypes.util with no /sbin/ldconfi https://bugs.python.org/issue21826 closed by berker.peksag #22374: Replace contextmanager example and improve explanation https://bugs.python.org/issue22374 closed by berker.peksag #23927: getargs.c skipitem() doesn't skip 'w*' https://bugs.python.org/issue23927 closed by serhiy.storchaka #24085: large memory overhead when pyc is recompiled https://bugs.python.org/issue24085 closed by inada.naoki #25094: [EASY][Windows] test_tools fails on Windows when passing https://bugs.python.org/issue25094 closed by vstinner #25156: shutil.copyfile should internally use os.sendfile when possibl https://bugs.python.org/issue25156 closed by giampaolo.rodola #25943: Integer overflow in _bsddb leads to heap corruption https://bugs.python.org/issue25943 closed by serhiy.storchaka #27717: sqlite documentation bug https://bugs.python.org/issue27717 closed by berker.peksag #28536: Show the qualified name when a call fails https://bugs.python.org/issue28536 closed by berker.peksag #28677: difficult to parse sentence structure in "When an instance att https://bugs.python.org/issue28677 closed by taleinat #30270: Remove sqlite3.Cache display method https://bugs.python.org/issue30270 closed by berker.peksag #31166: null pointer deref and segfault in _PyObject_Alloc (obmalloc.c https://bugs.python.org/issue31166 closed by inada.naoki #31935: subprocess.run() timeout not working with grandchildren and st https://bugs.python.org/issue31935 closed by martin.panter #32083: sqlite3 Cursor.description can't return column types https://bugs.python.org/issue32083 closed by berker.peksag #32663: SMTPUTF8SimTests are not actually being run https://bugs.python.org/issue32663 closed by r.david.murray #33102: get the nth folder of a given path https://bugs.python.org/issue33102 closed by taleinat #33336: [imaplib] MOVE is a legal command https://bugs.python.org/issue33336 closed by vstinner #33468: Add try-finally contextlib.contextmanager example https://bugs.python.org/issue33468 closed by taleinat #33719: Test failures on Python 3.7 beta 5 and Windows 10 https://bugs.python.org/issue33719 closed by vstinner #33720: test_marshal: crash in Python 3.7b5 on Windows 10 https://bugs.python.org/issue33720 closed by serhiy.storchaka #34008: Do we support calling Py_Main() after Py_Initialize()? https://bugs.python.org/issue34008 closed by ncoghlan #34084: possible free statically allocated string in compiler when eas https://bugs.python.org/issue34084 closed by serhiy.storchaka #34127: Gramatically incorrect error message for some calls with wrong https://bugs.python.org/issue34127 closed by rhettinger #34136: Del on class __annotations__ regressed, failing test https://bugs.python.org/issue34136 closed by serhiy.storchaka #34149: Behavior of the min/max with key=None https://bugs.python.org/issue34149 closed by rhettinger #34159: asyncio basic event loop stuck with no tasks scheduled or read https://bugs.python.org/issue34159 closed by Sheng Zhong #34161: (good first issue) Tutorial 7.1 str.format() code example synt https://bugs.python.org/issue34161 closed by Mariatta #34163: Python latest release 2.7 shows SSL error https://bugs.python.org/issue34163 closed by brett.cannon #34164: base64.b32decode() leads into UnboundLocalError and OverflowEr https://bugs.python.org/issue34164 closed by serhiy.storchaka #34166: Tools/msgfmt.py emits a DeprecationWarning under Python 3.7 https://bugs.python.org/issue34166 closed by serhiy.storchaka #34167: Standard library docs: prev/next skip right over 16.11 https://bugs.python.org/issue34167 closed by inada.naoki #34169: itertools.repeat does not accept None as an explicit count https://bugs.python.org/issue34169 closed by rhettinger #34174: argparse formatter_class issue for RawDescriptionHelpFormatter https://bugs.python.org/issue34174 closed by Mariatta #34175: typing.NamedTuple: type-checking error when "index" used as me https://bugs.python.org/issue34175 closed by gvanrossum #34177: test_site fails in macOS-PR VSTS builds for 3.7 branch https://bugs.python.org/issue34177 closed by inada.naoki #34179: test_statistics fails after test_time https://bugs.python.org/issue34179 closed by skrah #34180: bool(Q) always return True for a priority queue Q https://bugs.python.org/issue34180 closed by rhettinger #34181: Lib/test/test_typing.py failed when ran as a script https://bugs.python.org/issue34181 closed by serhiy.storchaka #34183: Lib/test/test_contextlib_async.py failed when ran as a script https://bugs.python.org/issue34183 closed by serhiy.storchaka #34184: Lib/test/test_dataclasses.py failed when ran as a script https://bugs.python.org/issue34184 closed by serhiy.storchaka #34186: [3.6.6 on macOS] os.listdir replacing "/" with ":" https://bugs.python.org/issue34186 closed by zach.ware #34189: Add simple tests for new Tk widget options https://bugs.python.org/issue34189 closed by serhiy.storchaka #34190: x86 Gentoo Refleaks 3.x: test_sys_setprofile leaked [1, 1, 1] https://bugs.python.org/issue34190 closed by vstinner #34195: test_nt_helpers fails with case difference in drive letter https://bugs.python.org/issue34195 closed by tim.golden #34196: @staticmethod mangles name of outside class with __ (it is not https://bugs.python.org/issue34196 closed by rhettinger #34197: Make csv.Dialect attributes skipinitialspace, doublequote and https://bugs.python.org/issue34197 closed by serhiy.storchaka #34201: Make ndarray.readonly a bool https://bugs.python.org/issue34201 closed by serhiy.storchaka #34202: 3.6 ZipFile fails with Path https://bugs.python.org/issue34202 closed by berker.peksag #34208: Change in 3.7 expression evaluation? https://bugs.python.org/issue34208 closed by eryksun #34209: racecondition https://bugs.python.org/issue34209 closed by inada.naoki #34210: Small improvements in heapq (refactoring) https://bugs.python.org/issue34210 closed by rhettinger #34217: windows: cross compilation fails due to headers with uppercase https://bugs.python.org/issue34217 closed by inada.naoki #34218: test_xml_etree_c leaked [68, 68, 74] references, sum=210 https://bugs.python.org/issue34218 closed by serhiy.storchaka #34220: Serialization of email message without header line length limi https://bugs.python.org/issue34220 closed by r.david.murray #34221: Any plans to combine collections.OrderedDict with dict https://bugs.python.org/issue34221 closed by rhettinger #34225: distutils._msvccompiler should trim INCLUDE/LIB directories https://bugs.python.org/issue34225 closed by steve.dower #34227: Weighted random.sample() (weighted sampling without replacemen https://bugs.python.org/issue34227 closed by rhettinger #34228: Allow PYTHONTRACEMALLOC=0 and -X tracemalloc=0 to disable expl https://bugs.python.org/issue34228 closed by vstinner #34229: Possible access to unintended variable in "cpython/Objects/sli https://bugs.python.org/issue34229 closed by serhiy.storchaka #34230: crashes in pysqlite_build_row_cast_map() on memory allocation https://bugs.python.org/issue34230 closed by serhiy.storchaka #34233: subprocess.check_output goes to infinte loop https://bugs.python.org/issue34233 closed by eryksun #34237: faq/design: PEP 572 adds assignment expressions https://bugs.python.org/issue34237 closed by ammar2 #34241: Segfault while Django template rendering https://bugs.python.org/issue34241 closed by vhelke

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Fw:[issue34221] Any plans to combine collections.OrderedDict with dict
by Zhao Lee July 27, 2018

July 27, 2018

Since Python 3.7，dicts remember the order that items were inserted, so any plans to combine collections.OrderedDict with dict? https://docs.python.org/3/library/collections.html?#collections.OrderedDict https://docs.python.org/3/library/stdtypes.html#dict BTW, I think it would be better to move "Dictionaries preserve insertion order" part at the end of the doc of https://docs.python.org/3/library/stdtypes.html#dict up below the doc for class dict(**kwarg) class dict(mapping, **kwarg) class dict(iterable, **kwarg) so that people won't miss the feature when consulting the doc <https://bugs.python.org/issue34221> _______________________________________

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What's the status of the PEP 572 implementation?
by Victor Stinner July 26, 2018

July 26, 2018

Hi, Is the PEP 572 implemented? If no, who is working on that? Is there a WIP pull request? An open issue? One month ago, I tried Chis Angelo's implementation but it implemented an old version of the PEP which evolved in the meanwhile. Victor

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Tests failing on Windows with TESTFN
by Tim Golden July 25, 2018

July 25, 2018

[trying again; sorry if it shows up twice] I'm just easing back into core development work by trying to get a stable testing environment for Python development on Windows. One problem is that certain tests use support.TESTFN (a local directory constructed from the pid) for output files etc. However this can cause issues on Windows when recreating the folders / files for multiple tests, especially when running in parallel. Here's an example on my laptop deliberately running 3 tests with -j0 which I know will generate an error about one time in three: C:\work-in-progress\cpython>python -mtest -j0 test_urllib2 test_bz2 test_importlib Running Debug|Win32 interpreter... Run tests in parallel using 6 child processes 0:00:23 [1/3/1] test_urllib2 failed test test_urllib2 failed -- Traceback (most recent call last): File "C:\work-in-progress\cpython\lib\test\test_urllib2.py", line 821, in test_file f = open(TESTFN, "wb") PermissionError: [Errno 13] Permission denied: '@test_15564_tmp' Although these errors are both intermittent and fairly easily spotted, the effect is that I rarely get a clean test run when I'm applying a patch. I started to address this years ago but things stalled. I'm happy to pick this up again and have another go, but I wanted to ask first whether there was any objection to my converting tests to using tempfile functions which should avoid the problem? TJG

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