Mailman 3 April 2016 - Python-Dev

Dependent packages not listed on PyPI
by Andreas Maier April 19, 2016

April 19, 2016

Hi, I have a package "pywbem" which in its setup script specifies a number of dependent packages via "install_requires". I should also say that it extends setuptools/distutils with its own additional keywords, e.g. it adds a "develop_requires", but I believe (hope) that is irrelevant for my problem. In pywbem 0.8.3, the dependencies are: args = { ..., 'install_requires': [ 'six', 'ply', ], ..., } and when running on Python 2.x, an additional one is added, dependent on the OS platform and bit size: if sys.version_info[0] == 2: if platform.system() == 'Windows': if platform.architecture()[0] == '64bit': m2crypto_req = 'M2CryptoWin64>=0.21' else: m2crypto_req = 'M2CryptoWin32>=0.21' else: m2crypto_req = 'M2Crypto>=0.24' args['install_requires'] += [ m2crypto_req, ] The problem is that the pywbem package on PyPI does not show these dependencies: https://pypi.python.org/pypi/pywbem/0.8.3 I wonder whether this is the reason for a particular installation problem we have seen (https://github.com/pywbem/pywbem/issues/113). I do see other projects on PyPI, that show the dependencies they specify in their setup scripts, on their PyPI package page in a "*Requires Distributions*" section: * https://pypi.python.org/pypi/bandit/0.17.3 * https://pypi.python.org/pypi/json-spec/0.9.14 Many others also do not have their dependencies shown, including six, pbr, PyYAML, lxml, to name just a few. So far, I was unable to find out what the presence or absence of that information is related to, in the source of the project. Here are my questions: 1. What causes the "Requires Distributions" section on a PyPI package page to show up there? 2. Is it important to show up there (e.g. for some tools)? Andy

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My first post here ~ do you need more Python core developers on Windows?
by Burkhard Meier April 19, 2016

April 19, 2016

Hi, I just subscribed to the "Python-Dev" mailing list and the 'Welcome" reply asked me to introduce myself. My name is Burkhard Meier and I wrote the "Python GUI Programming Cookbook" published by Packt. It is available on Amazon and PacktPub.com. Maybe I can become more involved in the Python community as a Python developer on Windows . Kind regards, Burkhard Meier

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Re: [Python-Dev] Pathlib enhancements - acceptable inputs and outputs for __fspath__ and os.fspath()
by Wes Turner April 19, 2016

April 19, 2016

On Apr 18, 2016 3:19 PM, "Ethan Furman" <ethan(a)stoneleaf.us> wrote: > > On 04/18/2016 12:54 PM, Wes Turner wrote: > >> Don't we *have* to always support bytes because other programs can >> create filenames containing bytes? > > > Yes, but not every function has to support bytes. Because there's no function overloading in Python, we then must have explicit typing conditionals. I haven't the time to dig through and compare this with the other fine solutions presented; is there a reason that a proxy/facade PrimitiveType wouldn't solve for this? class TextThing: __init__(self, data): self.data = data self.type_ = type(data) __getattr__(self, key): return getattr(self.data, key) > > > -- > ~Ethan~ > > _______________________________________________ > Python-Dev mailing list > Python-Dev(a)python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/wes.turner%40gmail.com

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Re: [Python-Dev] [Python-ideas] pep 7 line break suggestion differs from pep 8
by Chris Angelico April 19, 2016

April 19, 2016

On Tue, Apr 19, 2016 at 5:33 AM, Joseph Jevnik <joejev(a)gmail.com> wrote: > I saw that there was recently a change to pep 8 to suggest adding a line > break before a binary operator. Pep 7 suggests the opposite: > >> When you break a long expression at a binary operator, the operator goes >> at the end of the previous line, e.g.: > >> if (type->tp_dictoffset != 0 && base->tp_dictoffset == 0 && >> type->tp_dictoffset == b_size && >> (size_t)t_size == b_size + sizeof(PyObject *)) >> return 0; /* "Forgive" adding a __dict__ only */ > > I imagine that some of the reasons for making the change in pep 8 for > readability reasons will also > translate to C; maybe pep 7 should also be updated. I would agree with this. Passing it directly to python-dev as that's where the key decision makers are. ChrisA

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[Question][Asyncio] Process + Threads + asyncio... has sense?
by cr0hn April 18, 2016

April 18, 2016

Hi all, It's the first time I write in this list. Sorry if it's not the best place for this question. After I read the Asyncio's documentation, PEPs, Guido/Jesse/David Beazley articles/talks, etc, I developed a PoC library that mixes: Process + Threads + Asyncio Tasks, doing an scheme like this diagram: main -> Process 1 -> Thread 1.1 -> Task 1.1.1 -> Task 1.1.2 -> Task 1.1.3 -> Thread 1.2 -> Task 1.2.1 -> Task 1.2.2 -> Task 1.2.3 Process 2 -> Thread 2.1 -> Task 2.1.1 -> Task 2.1.2 -> Task 2.1.3 -> Thread 2.2 -> Task 2.2.1 -> Task 2.2.2 -> Task 2.2.3 In my local tests, this approach appear to improve (and simplify) the concurrency/parallelism for some tasks but, before release the library at github, I don't know if my aproach is wrong and I would appreciate your opinion. Thank you very much for your time. Regards! -- Daniel García a.k.a. cr0hn - Security researcher and pentester @ggdaniel http://www.cr0hn.com/me/

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Re: [Python-Dev] Updated PEP 509
by Jim J. Jewett April 18, 2016

April 18, 2016

On Sat, Apr 16, 2016 at 5:01 PM, Victor Stinner <victor.stinner(a)gmail.com> wrote: > * I mentionned that version++ must be atomic, and that in the case of > CPython, it's done by the GIL Better; if those methods *already* hold the GIL, it is worth saying "already", to indicate that the change is not expensive. > * I removed the dict[key]=value; dict[key]=value. It's really a > micro-optimization. I also fear that Raymond will complain because it > adds an if in the hot code of dict, and the dict type is very > important for Python performance. That is an acceptable answer. Though I really do prefer explicitly *refusing to promise* either way when the replacement/replaced objects are ==. dicts (and other collections) already assume sensible ==, even explicitly allowing self-matches of objects that are not equal to themselves. I don't like the idea of making new promises that violate (or rely on violations of) that sensible == assumption. -jJ

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Re: [Python-Dev] Wordcode: new regular bytecode using 16-bit units
by Demur Rumed April 17, 2016

April 17, 2016

The outstanding bug with this patch right now is a regression in line numbers causing the test for http://bugs.python.org/issue9936 to fail. I've tried to debug it without success

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pathlib - current status of discussions
by Ethan Furman April 17, 2016

April 17, 2016

name: ---- We are down to two choices: - __fspath__, or - __fspathname__ The final choice I suspect will be affected by the choice to allow (or not) bytes. method or attribute: ------------------- method built-in: -------- Almost - we'll put it in the os module add to str: ---------- No, not all strings are paths. add to C API: ------------ Yes. Possible names include PyUnicode_FromFSPath and PyObject_Path -- again, the choice of bytes inclusion will affect the final choice of name. add a Path ABC: -------------- undecided Sticking points: --------------- Do we allow bytes to be returned from os.fspath()? If yes, then do we allow bytes from __fspath__()? -- ~Ethan~

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PEP 8 updated on whether to break before or after a binary update
by Guido van Rossum April 16, 2016

April 16, 2016

After a fruitful discussion on python-ideas I've decided that it's fine to break lines *before* a binary operator. It looks better and Knuth recommends it. The head of the python-ideas discussion: https://mail.python.org/pipermail/python-ideas/2016-April/039752.html See also the discussion in the tracker: http://bugs.python.org/issue26763 Here's the diff I applied: https://hg.python.org/peps/rev/3857909d7956 The talk by Brandon Rhodes where Knuth is referenced ([3] below): http://rhodesmill.org/brandon/slides/2012-11-pyconca/#laying-down-the-law The key section in PEP 8 that was updated (apart from fixing up references): Should a line break before or after a binary operator? ------------------------------------------------------ For decades the recommended style has been to break after binary operators. However, recent reseach unearthed recommendations by Donald Knuth to break *before* binary operators, in his writings about typesetting [3]_. Therefore it is permissible to break before or after a binary operator, as long as the convention is consistent locally. For new code Knuth's style is suggested. Some examples of code breaking before binary Boolean operators:: class Rectangle(Blob): def __init__(self, width, height, color='black', emphasis=None, highlight=0): if (width == 0 and height == 0 and color == 'red' and emphasis == 'strong' or highlight > 100): raise ValueError("sorry, you lose") if (width == 0 and height == 0 and (color == 'red' or emphasis is None)): raise ValueError("I don't think so -- values are %s, %s" % (width, height)) Blob.__init__(self, width, height, color, emphasis, highlight) -- --Guido van Rossum (python.org/~guido)

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Summary of Python tracker Issues
by Python tracker April 15, 2016

April 15, 2016

ACTIVITY SUMMARY (2016-04-08 - 2016-04-15) Python tracker at http://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 5489 (+12) closed 33039 (+46) total 38528 (+58) Open issues with patches: 2381 Issues opened (45) ================== #11205: Evaluation order of dictionary display is different from refer http://bugs.python.org/issue11205 reopened by ncoghlan #25609: Add a ContextManager ABC and type http://bugs.python.org/issue25609 reopened by brett.cannon #25731: Assigning and deleting __new__ attr on the class does not allo http://bugs.python.org/issue25731 reopened by barry #26673: Tkinter error when opening IDLE configuration menu http://bugs.python.org/issue26673 reopened by terry.reedy #26716: EINTR handling in fcntl http://bugs.python.org/issue26716 opened by Jack Zhou #26717: wsgiref.simple_server: mojibake with cp1252 bytes in PATH_INFO http://bugs.python.org/issue26717 opened by Anthony Sottile #26720: memoryview from BufferedWriter becomes garbage http://bugs.python.org/issue26720 opened by martin.panter #26721: Avoid socketserver.StreamRequestHandler.wfile doing partial wr http://bugs.python.org/issue26721 opened by martin.panter #26724: Serialize dict with non-string keys to JSON — unexpected res http://bugs.python.org/issue26724 opened by anton-ryzhov #26726: Incomplete Internationalization in Argparse Module http://bugs.python.org/issue26726 opened by IronGrid #26728: make pdb.set_trace() accept debugger commands as arguments and http://bugs.python.org/issue26728 opened by irdb #26729: Incorrect __text_signature__ for sorted http://bugs.python.org/issue26729 opened by eriknw #26730: SpooledTemporaryFile doesn't correctly preserve data for text http://bugs.python.org/issue26730 opened by James Hennessy #26731: subprocess on windows leaks stdout/stderr handle to child proc http://bugs.python.org/issue26731 opened by saifujinaro #26732: multiprocessing sentinel resource leak http://bugs.python.org/issue26732 opened by quick-b #26733: staticmethod and classmethod are ignored when disassemble clas http://bugs.python.org/issue26733 opened by xiang.zhang #26736: Use HTTPS protocol in links http://bugs.python.org/issue26736 opened by serhiy.storchaka #26739: idle: Errno 10035 a non-blocking socket operation could not be http://bugs.python.org/issue26739 opened by MICHAEL JACOBSON #26740: tarfile: accessing (listing and extracting) tarball fails with http://bugs.python.org/issue26740 opened by Tomas Tomecek #26741: subprocess.Popen should emit a ResourceWarning in destructor i http://bugs.python.org/issue26741 opened by haypo #26742: imports in test_warnings changes warnings.filters http://bugs.python.org/issue26742 opened by haypo #26743: Unable to import random with python2.7 on power pc based machi http://bugs.python.org/issue26743 opened by ragreddy #26744: print() function hangs on MS-Windows 10 http://bugs.python.org/issue26744 opened by Ma Lin #26745: Redundant code in _PyObject_GenericSetAttrWithDict http://bugs.python.org/issue26745 opened by xiang.zhang #26746: struct.pack(): trailing padding bytes on x64 http://bugs.python.org/issue26746 opened by skrah #26750: Mock autospec does not work with subclasses of property() http://bugs.python.org/issue26750 opened by amaury.forgeotdarc #26751: Possible bug in sorting algorithm http://bugs.python.org/issue26751 opened by David.Manowitz #26752: Mock(2.0.0).assert_has_calls() raise AssertionError in two sam http://bugs.python.org/issue26752 opened by jekin000 #26753: Obmalloc lock LOCK_INIT and LOCK_FINI are never used http://bugs.python.org/issue26753 opened by larry #26754: PyUnicode_FSDecoder() accepts arbitrary iterable http://bugs.python.org/issue26754 opened by serhiy.storchaka #26755: Update version{added,changed} docs in devguide http://bugs.python.org/issue26755 opened by berker.peksag #26756: fileinput handling of unicode errors from standard input http://bugs.python.org/issue26756 opened by jmb236 #26757: test_urllib2net.test_http_basic() timeout after 15 min on http://bugs.python.org/issue26757 opened by haypo #26758: Unnecessary format string handling for no argument slot wrappe http://bugs.python.org/issue26758 opened by josh.r #26759: PyBytes_FromObject accepts arbitrary iterable http://bugs.python.org/issue26759 opened by serhiy.storchaka #26760: Document PyFrameObject http://bugs.python.org/issue26760 opened by brett.cannon #26762: test_multiprocessing_spawn leaves processes running in backgro http://bugs.python.org/issue26762 opened by martin.panter #26763: Update PEP-8 regarding binary operators http://bugs.python.org/issue26763 opened by IanLee1521 #26764: SystemError in bytes.__rmod__ http://bugs.python.org/issue26764 opened by serhiy.storchaka #26765: Factor out common bytes and bytearray implementation http://bugs.python.org/issue26765 opened by serhiy.storchaka #26766: The result type of bytearray formatting is not stable http://bugs.python.org/issue26766 opened by berker.peksag #26767: Inconsistant error messages for failed attribute modification http://bugs.python.org/issue26767 opened by serhiy.storchaka #26769: Python 2.7: make private file descriptors non inheritable http://bugs.python.org/issue26769 opened by haypo #26770: _Py_set_inheritable(): do nothing if the FD_CLOEXEC close is a http://bugs.python.org/issue26770 opened by haypo #26771: python-config.sh.in INCDIR does not match python version if ex http://bugs.python.org/issue26771 opened by benzea Most recent 15 issues with no replies (15) ========================================== #26771: python-config.sh.in INCDIR does not match python version if ex http://bugs.python.org/issue26771 #26769: Python 2.7: make private file descriptors non inheritable http://bugs.python.org/issue26769 #26767: Inconsistant error messages for failed attribute modification http://bugs.python.org/issue26767 #26765: Factor out common bytes and bytearray implementation http://bugs.python.org/issue26765 #26760: Document PyFrameObject http://bugs.python.org/issue26760 #26758: Unnecessary format string handling for no argument slot wrappe http://bugs.python.org/issue26758 #26752: Mock(2.0.0).assert_has_calls() raise AssertionError in two sam http://bugs.python.org/issue26752 #26750: Mock autospec does not work with subclasses of property() http://bugs.python.org/issue26750 #26739: idle: Errno 10035 a non-blocking socket operation could not be http://bugs.python.org/issue26739 #26728: make pdb.set_trace() accept debugger commands as arguments and http://bugs.python.org/issue26728 #26726: Incomplete Internationalization in Argparse Module http://bugs.python.org/issue26726 #26700: Make digest_size a class variable http://bugs.python.org/issue26700 #26697: tkFileDialog crash on askopenfilename Python 2.7 64-bit Win7 http://bugs.python.org/issue26697 #26696: Document collections.abc.ByteString http://bugs.python.org/issue26696 #26695: pickle and _pickle accelerator have different behavior when un http://bugs.python.org/issue26695 Most recent 15 issues waiting for review (15) ============================================= #26770: _Py_set_inheritable(): do nothing if the FD_CLOEXEC close is a http://bugs.python.org/issue26770 #26769: Python 2.7: make private file descriptors non inheritable http://bugs.python.org/issue26769 #26766: The result type of bytearray formatting is not stable http://bugs.python.org/issue26766 #26765: Factor out common bytes and bytearray implementation http://bugs.python.org/issue26765 #26764: SystemError in bytes.__rmod__ http://bugs.python.org/issue26764 #26763: Update PEP-8 regarding binary operators http://bugs.python.org/issue26763 #26755: Update version{added,changed} docs in devguide http://bugs.python.org/issue26755 #26750: Mock autospec does not work with subclasses of property() http://bugs.python.org/issue26750 #26745: Redundant code in _PyObject_GenericSetAttrWithDict http://bugs.python.org/issue26745 #26742: imports in test_warnings changes warnings.filters http://bugs.python.org/issue26742 #26741: subprocess.Popen should emit a ResourceWarning in destructor i http://bugs.python.org/issue26741 #26736: Use HTTPS protocol in links http://bugs.python.org/issue26736 #26733: staticmethod and classmethod are ignored when disassemble clas http://bugs.python.org/issue26733 #26730: SpooledTemporaryFile doesn't correctly preserve data for text http://bugs.python.org/issue26730 #26729: Incorrect __text_signature__ for sorted http://bugs.python.org/issue26729 Top 10 most discussed issues (10) ================================= #26743: Unable to import random with python2.7 on power pc based machi http://bugs.python.org/issue26743 20 msgs #26766: The result type of bytearray formatting is not stable http://bugs.python.org/issue26766 12 msgs #25702: Link Time Optimizations support for GCC and CLANG http://bugs.python.org/issue25702 10 msgs #25910: Fixing links in documentation http://bugs.python.org/issue25910 10 msgs #26647: ceval: use Wordcode, 16-bit bytecode http://bugs.python.org/issue26647 10 msgs #26716: EINTR handling in fcntl http://bugs.python.org/issue26716 9 msgs #26729: Incorrect __text_signature__ for sorted http://bugs.python.org/issue26729 9 msgs #26763: Update PEP-8 regarding binary operators http://bugs.python.org/issue26763 9 msgs #26359: CPython build options for out-of-the box performance http://bugs.python.org/issue26359 8 msgs #26601: Use new madvise()'s MADV_FREE on the private heap http://bugs.python.org/issue26601 8 msgs Issues closed (48) ================== #13410: String formatting bug in interactive mode http://bugs.python.org/issue13410 closed by serhiy.storchaka #13952: mimetypes doesn't recognize .csv http://bugs.python.org/issue13952 closed by berker.peksag #14784: Re-importing _warnings changes warnings.filters http://bugs.python.org/issue14784 closed by martin.panter #15984: Wrong documentation for PyUnicode_FromObject() and PyUnicode_F http://bugs.python.org/issue15984 closed by martin.panter #16329: mimetypes does not support webm type http://bugs.python.org/issue16329 closed by berker.peksag #17264: Update Building C and C++ Extensions with distutils documentat http://bugs.python.org/issue17264 closed by berker.peksag #17339: bytes() TypeError message is misleadingly narrow http://bugs.python.org/issue17339 closed by serhiy.storchaka #18461: X Error in tkinter http://bugs.python.org/issue18461 closed by serhiy.storchaka #21069: test_fileno of test_urllibnet intermittently fails http://bugs.python.org/issue21069 closed by martin.panter #22659: SyntaxError in the configure_ctypes http://bugs.python.org/issue22659 closed by berker.peksag #23397: PEP 431 implementation http://bugs.python.org/issue23397 closed by berker.peksag #24951: Idle test_configdialog fails on Fedora 23, 3.6 http://bugs.python.org/issue24951 closed by terry.reedy #25339: sys.stdout.errors is set to "surrogateescape" http://bugs.python.org/issue25339 closed by serhiy.storchaka #25496: tarfile: Default value for compresslevel is not documented http://bugs.python.org/issue25496 closed by martin.panter #25654: test_multiprocessing_spawn ResourceWarning with -Werror http://bugs.python.org/issue25654 closed by martin.panter #26057: Avoid nonneeded use of PyUnicode_FromObject() http://bugs.python.org/issue26057 closed by serhiy.storchaka #26257: Eliminate buffer_tests.py http://bugs.python.org/issue26257 closed by martin.panter #26404: socketserver context manager http://bugs.python.org/issue26404 closed by martin.panter #26585: Use html.escape to replace _quote_html in http.server http://bugs.python.org/issue26585 closed by martin.panter #26587: Possible duplicate entries in sys.path if .pth files are used http://bugs.python.org/issue26587 closed by brett.cannon #26609: Wrong request target in test_httpservers.py http://bugs.python.org/issue26609 closed by martin.panter #26610: test_venv.test_with_pip() fails when ctypes is missing http://bugs.python.org/issue26610 closed by haypo #26623: JSON encode: more informative error http://bugs.python.org/issue26623 closed by serhiy.storchaka #26624: Windows hangs in call to CRT setlocale() http://bugs.python.org/issue26624 closed by python-dev #26639: Tools/i18n/pygettext.py: replace deprecated imp module with im http://bugs.python.org/issue26639 closed by haypo #26668: Remove Lib/test/test_importlib/regrtest.py? http://bugs.python.org/issue26668 closed by brett.cannon #26685: Raise errors from socket.close() http://bugs.python.org/issue26685 closed by martin.panter #26687: Use Py_RETURN_NONE in sqlite3 module http://bugs.python.org/issue26687 closed by berker.peksag #26699: locale.str docstring is incorrect: "Convert float to integer" http://bugs.python.org/issue26699 closed by orsenthil #26706: Update OpenSSL version in readme http://bugs.python.org/issue26706 closed by python-dev #26712: Unify (r)split(), (l/r)strip() method tests http://bugs.python.org/issue26712 closed by martin.panter #26714: telnetlib.Telnet should act as a context manager http://bugs.python.org/issue26714 closed by SilentGhost #26715: can not deactivate venv (deactivate.bat) if the venv was activ http://bugs.python.org/issue26715 closed by zach.ware #26718: super.__init__ leaks memory if called multiple times http://bugs.python.org/issue26718 closed by brett.cannon #26719: More efficient formatting of ints and floats in json http://bugs.python.org/issue26719 closed by serhiy.storchaka #26722: Fold compare operators on constants (peephole) http://bugs.python.org/issue26722 closed by ncoghlan #26723: Add an option to skip _decimal module http://bugs.python.org/issue26723 closed by skrah #26725: list() destroys map object data http://bugs.python.org/issue26725 closed by ned.deily #26727: ctypes.util.find_msvcrt() does not work in python 3.5.1 http://bugs.python.org/issue26727 closed by steve.dower #26734: Repeated mmap\munmap calls during temporary allocation http://bugs.python.org/issue26734 closed by pitrou #26735: os.urandom(2500) fails on Solaris 11.3 http://bugs.python.org/issue26735 closed by haypo #26737: csv.DictReader throws generic error when fieldnames is accesse http://bugs.python.org/issue26737 closed by serhiy.storchaka #26738: listname.strip() does not work right if the name ends with an http://bugs.python.org/issue26738 closed by SilentGhost #26747: types.InstanceType only for old style class only in 2.7 http://bugs.python.org/issue26747 closed by berker.peksag #26748: enum.Enum is False-y http://bugs.python.org/issue26748 closed by ethan.furman #26749: Update devguide to include Fedora's DNF http://bugs.python.org/issue26749 closed by berker.peksag #26761: winsound module very unstable in Windows 10 http://bugs.python.org/issue26761 closed by zach.ware #26768: Fix instructions at WindowsCompilers for MSVC/SDKs http://bugs.python.org/issue26768 closed by berker.peksag

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