Mailman 3 April 2018 - Python-Dev

Re: [Python-Dev] PEP 575: Unifying function/method classes
by Jeroen Demeyer 14 Apr '18

14 Apr '18

On 2018-04-13 15:23, Nick Coghlan wrote: > There's also a section in the rationale which refers to METH_USRx > flags, which I'm guessing from context are an idea you were > considering proposing, but eventually dropped from the rest of the > PEP. No, I actually still want to propose it. In my latest update of the PEP, I hope to have made it more clear.

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Summary of Python tracker Issues
by Python tracker 13 Apr '18

13 Apr '18

ACTIVITY SUMMARY (2018-04-06 - 2018-04-13) Python tracker at https://bugs.python.org/ To view or respond to any of the issues listed below, click on the issue. Do NOT respond to this message. Issues counts and deltas: open 6572 ( +4) closed 38452 (+32) total 45024 (+36) Open issues with patches: 2560 Issues opened (24) ================== #33238: AssertionError on await of Future returned by asyncio.wrap_fut https://bugs.python.org/issue33238 opened by Jason Haydaman #33239: tempfile module: functions with the 'buffering' option are inc https://bugs.python.org/issue33239 opened by MartyMacGyver #33240: shutil.rmtree fails when the inner floder is opened in Explore https://bugs.python.org/issue33240 opened by yuliu #33245: Unable to send CTRL_BREAK_EVENT https://bugs.python.org/issue33245 opened by Ofekmeister #33249: Unpickling objects with recursive references and partials fail https://bugs.python.org/issue33249 opened by aleneum #33250: Move VERSION attribute output up in pydoc (via help() builtin) https://bugs.python.org/issue33250 opened by handle #33251: ConfigParser.items returns items present in vars https://bugs.python.org/issue33251 opened by timster #33252: Clarify ResourceWarning documentation https://bugs.python.org/issue33252 opened by edmorley #33254: importlib.resources.contents() incorrectly yields an empty lis https://bugs.python.org/issue33254 opened by brett.cannon #33255: json.dumps has different behaviour if encoding='utf-8' or enco https://bugs.python.org/issue33255 opened by nhatcher #33256: module is not displayed by cgitb.html https://bugs.python.org/issue33256 opened by sblondon #33257: Race conditions in Tkinter with non-threaded Tcl https://bugs.python.org/issue33257 opened by Ivan.Pozdeev #33258: Unable to install 3.6.5 on Windows Server 2008 https://bugs.python.org/issue33258 opened by hpo0016 #33259: Encoding issue in the name of the local DST timezone https://bugs.python.org/issue33259 opened by maggyero #33261: inspect.isgeneratorfunction fails on hand-created methods https://bugs.python.org/issue33261 opened by jdemeyer #33262: Deprecate shlex.split(None) to read from stdin. https://bugs.python.org/issue33262 opened by christian.heimes #33263: Asyncio server enters an invalid state after a request with SO https://bugs.python.org/issue33263 opened by drtyrsa #33264: Remove to-be-deprecated urllib.request.urlretrieve function re https://bugs.python.org/issue33264 opened by adelfino #33266: 2to3 doesn't parse all valid string literals https://bugs.python.org/issue33266 opened by Zsolt Dollenstein #33267: ctypes array types create reference cycles https://bugs.python.org/issue33267 opened by Eric.Wieser #33269: InteractiveConsole behaves differently when used on terminal a https://bugs.python.org/issue33269 opened by Kadir Haldenbilen #33270: tags for anonymous code objects should be interned https://bugs.python.org/issue33270 opened by Daniel Moisset #33271: Exception handling matches subtypes, not subclasses https://bugs.python.org/issue33271 opened by Michael McCoy #33272: Which are reasonable reason for recursion limit in function _v https://bugs.python.org/issue33272 opened by mv.gavrilov Most recent 15 issues with no replies (15) ========================================== #33272: Which are reasonable reason for recursion limit in function _v https://bugs.python.org/issue33272 #33271: Exception handling matches subtypes, not subclasses https://bugs.python.org/issue33271 #33270: tags for anonymous code objects should be interned https://bugs.python.org/issue33270 #33263: Asyncio server enters an invalid state after a request with SO https://bugs.python.org/issue33263 #33261: inspect.isgeneratorfunction fails on hand-created methods https://bugs.python.org/issue33261 #33259: Encoding issue in the name of the local DST timezone https://bugs.python.org/issue33259 #33257: Race conditions in Tkinter with non-threaded Tcl https://bugs.python.org/issue33257 #33256: module is not displayed by cgitb.html https://bugs.python.org/issue33256 #33255: json.dumps has different behaviour if encoding='utf-8' or enco https://bugs.python.org/issue33255 #33251: ConfigParser.items returns items present in vars https://bugs.python.org/issue33251 #33250: Move VERSION attribute output up in pydoc (via help() builtin) https://bugs.python.org/issue33250 #33236: MagicMock().__iter__.return_value is different from MagicMock( https://bugs.python.org/issue33236 #33234: Improve list() pre-sizing for inputs with known lengths https://bugs.python.org/issue33234 #33225: imaplib module IMAP4.append() unexpected response BAD Command https://bugs.python.org/issue33225 #33220: Antivirus hits on python-2.7.14.amd64.msi file https://bugs.python.org/issue33220 Most recent 15 issues waiting for review (15) ============================================= #33271: Exception handling matches subtypes, not subclasses https://bugs.python.org/issue33271 #33266: 2to3 doesn't parse all valid string literals https://bugs.python.org/issue33266 #33264: Remove to-be-deprecated urllib.request.urlretrieve function re https://bugs.python.org/issue33264 #33263: Asyncio server enters an invalid state after a request with SO https://bugs.python.org/issue33263 #33261: inspect.isgeneratorfunction fails on hand-created methods https://bugs.python.org/issue33261 #33257: Race conditions in Tkinter with non-threaded Tcl https://bugs.python.org/issue33257 #33256: module is not displayed by cgitb.html https://bugs.python.org/issue33256 #33251: ConfigParser.items returns items present in vars https://bugs.python.org/issue33251 #33239: tempfile module: functions with the 'buffering' option are inc https://bugs.python.org/issue33239 #33237: Improve AttributeError message for partially initialized modul https://bugs.python.org/issue33237 #33228: Use Random.choices in tempfile https://bugs.python.org/issue33228 #33227: Cmd do_something only accepts one argument https://bugs.python.org/issue33227 #33222: Various test failures if PYTHONUSERBASE is not canonicalized https://bugs.python.org/issue33222 #33217: x in enum.Flag member is True when x is not a Flag https://bugs.python.org/issue33217 #33216: Wrong order of stack for CALL_FUNCTION_VAR and CALL_FUNCTION_V https://bugs.python.org/issue33216 Top 10 most discussed issues (10) ================================= #33233: Suggest third-party cmd2 module as alternative to cmd https://bugs.python.org/issue33233 15 msgs #33240: shutil.rmtree fails when the inner floder is opened in Explore https://bugs.python.org/issue33240 7 msgs #33099: test_poplib hangs with the changes done in PR https://bugs.python.org/issue33099 6 msgs #11122: bdist_rpm should use rpmbuild, not rpm https://bugs.python.org/issue11122 5 msgs #33227: Cmd do_something only accepts one argument https://bugs.python.org/issue33227 4 msgs #33237: Improve AttributeError message for partially initialized modul https://bugs.python.org/issue33237 4 msgs #33264: Remove to-be-deprecated urllib.request.urlretrieve function re https://bugs.python.org/issue33264 4 msgs #23403: Use pickle protocol 4 by default? https://bugs.python.org/issue23403 3 msgs #24882: ThreadPoolExecutor doesn't reuse threads until #threads == max https://bugs.python.org/issue24882 3 msgs #33065: IDLE debugger: problem importing user created module https://bugs.python.org/issue33065 3 msgs Issues closed (31) ================== #8243: curses writing to window's bottom right position raises: `_cur https://bugs.python.org/issue8243 closed by ned.deily #24068: statistics module - incorrect results with boolean input https://bugs.python.org/issue24068 closed by wolma #28832: Reduce memset in dict creation https://bugs.python.org/issue28832 closed by inada.naoki #29613: Support for SameSite Cookies https://bugs.python.org/issue29613 closed by alex #29673: Some gdb macros are broken in 3.6 https://bugs.python.org/issue29673 closed by ned.deily #30686: make `make install` faster https://bugs.python.org/issue30686 closed by inada.naoki #31201: make test: module test that failed doesn't exist https://bugs.python.org/issue31201 closed by ned.deily #31584: Documentation Language mixed up https://bugs.python.org/issue31584 closed by mdk #31920: pygettext ignores directories as inputfile argument https://bugs.python.org/issue31920 closed by serhiy.storchaka #32759: multiprocessing.Array do not release shared memory https://bugs.python.org/issue32759 closed by pitrou #33031: Questionable code in OrderedDict definition https://bugs.python.org/issue33031 closed by serhiy.storchaka #33097: concurrent futures Executors accept tasks after interpreter sh https://bugs.python.org/issue33097 closed by pitrou #33169: importlib.invalidate_caches() doesn't clear all caches https://bugs.python.org/issue33169 closed by brett.cannon #33188: dataclass MRO entry resolution for type variable metaclasses: https://bugs.python.org/issue33188 closed by levkivskyi #33200: Optimize the empty set "literal" https://bugs.python.org/issue33200 closed by serhiy.storchaka #33201: Modernize "Extension types" documentation https://bugs.python.org/issue33201 closed by pitrou #33219: x in IntFlag should test raise TypeError if x is not an IntFla https://bugs.python.org/issue33219 closed by ethan.furman #33229: Documentation - io — Core tools for working with streams - https://bugs.python.org/issue33229 closed by Mikhail Zakharov #33230: _decimal build failure (unsupported platform for that module) https://bugs.python.org/issue33230 closed by skrah #33241: Tooltip not display with macOS 64-bit installer 3.6.5 but work https://bugs.python.org/issue33241 closed by ned.deily #33242: Support binary symbol names https://bugs.python.org/issue33242 closed by eryksun #33243: nltk is not working properly https://bugs.python.org/issue33243 closed by serhiy.storchaka #33244: Overflow error https://bugs.python.org/issue33244 closed by terry.reedy #33246: Note in 18.2. json — JSON encoder and decoder is incorrect https://bugs.python.org/issue33246 closed by inada.naoki #33247: File "<string>" is opened and read unconditionally https://bugs.python.org/issue33247 closed by serhiy.storchaka #33248: __await__ behaves different with or without PYTHONASYNCIODEBUG https://bugs.python.org/issue33248 closed by Jonas Obrist #33253: xxsubtype.bench does not function correctly on CPython 3+ https://bugs.python.org/issue33253 closed by serhiy.storchaka #33260: Update token.py etc for ASYNC and AWAIT https://bugs.python.org/issue33260 closed by serhiy.storchaka #33265: contextlib.ExitStack abuses __self__ https://bugs.python.org/issue33265 closed by ncoghlan #33268: iteration over attrs in metaclass' __new__ affects class' __na https://bugs.python.org/issue33268 closed by eric.smith #33273: Allow multiple imports from one module while preserving its na https://bugs.python.org/issue33273 closed by zach.ware

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Re: [Python-Dev] PEP 575: Unifying function/method classes
by Jeroen Demeyer 13 Apr '18

13 Apr '18

To make it easier to test and try out PEP 575, I created a binder repo: https://mybinder.org/v2/gh/jdemeyer/pep575binder.git /master?filepath=index.ipynb

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python3.5.3: xmlrpc_net unit test fail
by Nikita Gupta 12 Apr '18

12 Apr '18

Hi All, Before installing python 3.5.3, i performed the test cases provided with the source tar ball. But 3 tests failed. I figured out the reason for other 2. But 1 test case is out of my understanding. Re-running test 'test_xmlrpc_net' in verbose mode test_python_builders (test.test_xmlrpc_net.PythonBuildersTest) ... ERROR ====================================================================== ERROR: test_python_builders (test.test_xmlrpc_net.PythonBuildersTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "/pkgs/Python-3.5.3/Lib/test/test_xmlrpc_net.py", line 17, in test_python_builders builders = server.getAllBuilders() File "/pkgs/Python-3.5.3/Lib/xmlrpc/client.py", line 1092, in __call__ return self.__send(self.__name, args) File "/pkgs/Python-3.5.3/Lib/xmlrpc/client.py", line 1432, in __request verbose=self.__verbose File "/pkgs/Python-3.5.3/Lib/xmlrpc/client.py", line 1134, in request return self.single_request(host, handler, request_body, verbose) File "/pkgs/Python-3.5.3/Lib/xmlrpc/client.py", line 1167, in single_request dict(resp.getheaders()) xmlrpc.client.ProtocolError: <ProtocolError for buildbot.python.org/all/xmlrpc/: 503 Service Unavailable> ---------------------------------------------------------------------- Ran 1 test in 0.215s FAILED (errors=1) test test_xmlrpc_net failed Can somebody highlight the reason of failure. -- Regards, Nikita Gupta

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Possible undefined behavior on creating a method named "__dict__"
by Joao S. O. Bueno 12 Apr '18

12 Apr '18

I just came across a code snippet that would define a method with the "__dict__" name - like in: class A: def __dict__(self): return () The resulting class's instances can be assigned dynamic attributes as usual, but one can never acess its actual local variables through instance.__dict__ - the method is retrieved instead. Calling "vars" will also fail on objects of this class. This behavior is weird, and I believe is actually a side-effect of implementation details on CPython. I am not sure whether it shoud just: 1 - be left as is - whoever reuses __dict__ as a method had it coming 2 - document CPythn behavior 3 - file that as a bug to disallow __dict__ override in class declaration 4 - file that as a bug to not-create class __dict__ when one is explictly created in Python code (the same that happens when one have "__slots__". I have the feeling that (1) is just good - but then, I am at least posting this e-mail here. Similar weird things go when one creates a method named "__class__", and possible other names. (I just checked that pypy3 mimics the behavior) js -><-

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Reminder: 2018 Python Language Summit signups close next week
by Larry Hastings 11 Apr '18

11 Apr '18

The deadline is a week from today, April 18th 2018. Original announcement below. -- It’s that time again: time to start thinking about the Python Language Summit! The 2018 summit will be held on Wednesday, May 9, from 10am to 4pm, at the Huntington Convention Center in Cleveland, Ohio, USA. Your befezzled and befuddled hosts Barry and Larry will once more be behind the big desk in front. The summit’s purpose is to disseminate information and spark conversation among core Python developers. It’s our yearly opportunity to get together for an in-person discussion, to review interesting developments of the previous year and hash out where we’re going next. And we have lots to talk about! 3.7 is in beta, and we've all collectively started work on 3.8 too. As before, we’re using Google Forms to collect signups. Signups are open now; the deadline to sign up is Wednesday April 18th, 2018 (AoE). Please do us a favor and sign up sooner rather than later. The signup form is simpler this year--I bet most people can be done in less than two minutes! One difference from last year: there are now *two* forms. The first form is for signing up to attend (the "Request For Invitation" form), and the second form is for proposing a talk. Please note: if you want to present, you still need to fill out the Request For Invitation form too. (Yes, it's more complicated this way, sorry. But having both on the same form kind of enforced a one-to-one mapping, and it's really a many-to-many mapping: one person might propose multiple talks, and one talk might have multiple presenters. Overall this should be less complicated.) You can find links to *both* forms on the official Python Language Summit 2018 page: https://us.pycon.org/2018/events/language-summit/ A few notes: * There will be lightning talks! Signups will only be available during the Language Summit itself. * You don’t need to be registered for PyCon in order to attend the summit! * We’ll have badge ribbons for Language Summit participants, which we’ll hand out at the summit room in the morning. * We're inviting Jake Edge from Linux Weekly News to attend the summit and provide press coverage again. Jake’s done a phenomenal job of covering the last few summits, providing valuable information not just for summit attendees, but also for the Python community at large. Jake’s coverage goes a long way toward demystifying the summit, while remaining respectful of confidential information that’s deemed “off the record” ahead of time by participants. One big final note (please read this!): When using Google Forms, you /can/ edit your responses later! When you fill out the form and hit Submit, the submission complete page (the one that says "Thanks for playing!") will have a link on it labeled "Edit your response". BOOKMARK THIS LINK! You can use this link at /any time/ to edit your response, up to the point that signups close on April 18th. Keep in mind, you'll need to bookmark each response independently: once for signing up to attend ("Request For Invitation"), and once for each talk proposal you submit. Again, /please/ be sure to save this bookmark yourself--we don't know how to find the link for you later if you don't save it. We hope to see you at the summit! [BL]arry

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Re: [Python-Dev] Are undocumented functions part of the stable ABI?
by Jeroen Demeyer 11 Apr '18

11 Apr '18

On 2018-04-10 13:49, Nick Coghlan wrote: > If it's only a semantic level change in the way the macro gets > expanded, then whether or not it needs an ABI version guard gets > judged on a case-by-case basis, and in this particular case, my view > would be that developers should be able to write extensions using the > stable ABI that accept function subclasses on 3.8+, without having to > *require* the use of 3.8+ to import their module. I don't really get this paragraph, but in any case I decided to *not* change PyCFunction_Check in PEP 575. It doesn't seem worth the trouble as this macro is probably not often used anyway. Also, it's hard to guess what it should be replaced with: why would extensions be calling PyCFunction_Check()?

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Re: [Python-Dev] Are undocumented functions part of the stable ABI?
by Jeroen Demeyer 10 Apr '18

10 Apr '18

On 2018-04-08 05:17, Nick Coghlan wrote: > Changing macro definitions doesn't break the stable ABI, as long as > the *old* macro expansions still do the right thing. To me, it looks like a bad idea to change macros. Imagine that the PyCFunction_Check macro changes in Python 3.8. Then an extension module compiled on 3.7 (but run on 3.8) would behave differently from the same extension compiled on 3.8. I cannot imagine that this is in line with the "stable ABI" philosophy. Jeroen.

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Trying to build from source, test-poplib fails
by Skip Montanaro 09 Apr '18

09 Apr '18

It's been a long while since I rebuilt Python from the Git source. I tried for the first time the other day. Everything passed except test_poplib and test_asyncio. The former just runs and runs and runs. Here's the first traceback I encounter when executing ./python Lib/test/test_poplib.py: test_stls_context (__main__.TestPOP3Class) ... Exception in thread Thread-16: Traceback (most recent call last): File "/home/skip/src/python/cpython/Lib/threading.py", line 917, in _bootstrap_inner self.run() File "Lib/test/test_poplib.py", line 227, in run asyncore.loop(timeout=0.1, count=1) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 207, in loop poll_fun(timeout, map) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 150, in poll read(obj) File "/home/skip/src/python/cpython/Lib/asyncore.py", line 87, in read obj.handle_error() File "/home/skip/src/python/cpython/Lib/asyncore.py", line 83, in read obj.handle_read_event() File "/home/skip/src/python/cpython/Lib/asyncore.py", line 422, in handle_read_event self.handle_read() File "Lib/test/test_poplib.py", line 194, in handle_read self._do_tls_handshake() File "Lib/test/test_poplib.py", line 174, in _do_tls_handshake self.socket.do_handshake() File "/home/skip/src/python/cpython/Lib/ssl.py", line 1108, in do_handshake self._sslobj.do_handshake() ssl.SSLError: [SSL: SSLV3_ALERT_CERTIFICATE_UNKNOWN] sslv3 alert certificate unknown (_ssl.c:1049) I thought perhaps I was missing something, but _ssl built just fine. I believe I have a recent enough version of libssl (1.0.2g), and I'm on a pretty vanilla system (up-to-date Ubuntu 17.10). SSL-wise: % apt search ssl | grep installed | egrep '^lib' | egrep ssl libgnutls-openssl27/artful,now 3.5.8-6ubuntu3 amd64 [installed] libio-socket-ssl-perl/artful,artful,now 2.050-1 all [installed] libnet-smtp-ssl-perl/artful,artful,now 1.04-1 all [installed] libnet-ssleay-perl/artful,now 1.80-1build1 amd64 [installed] libssl-dev/artful-updates,artful-security,now 1.0.2g-1ubuntu13.4 amd64 [installed] libssl-doc/artful-updates,artful-updates,artful-security,artful-security,now 1.0.2g-1ubuntu13.4 all [installed,automatic] libssl1.0.0/artful-updates,artful-security,now 1.0.2g-1ubuntu13.4 amd64 [installed] Any clues about what I might be missing from my setup would be appreciated. Not sure what was wrong with test_asyncio. I ran it in isolation and it passed. Thx, Skip

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Is it useful to update cgitb module?
by Stéphane Blondon 09 Apr '18

09 Apr '18

Hello, I wonder if it's useful to update the cgitb module, in particular the html output. I see some possible improvements: 1. In both text and html versions: When a module is called, there are no parameters (displayed as '()'). I think they are unnecessary. Perhaps the parentheses should be removed? Perhaps it's better to keep them for backward compatibility? ### example for the text version ### $ python3 demo.py [...] /home/stephane/src/cgitest/demo.py in <module>() 7 def func1(a, b): [...] ### end of example ### 2. In html version only: a. If the executed code is in <module>: in this case, it is not shown in the html version because the square brackets are interpreted as a html tag (see the picture in attachement). b. Update the style of the html or/and using html5. It would be prettier but it will be a big change for probably too few benefits. What do you think about them? I can report bugs and send pull-requests for them but I would prefer to get feedbacks before. Regards, Stéphane

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