Python-Dev April 2018

python-dev@python.org

103 participants
90 discussions

Re: [Python-Dev] PEP 575: Unifying function/method classes

by Jeroen Demeyer

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

2 years, 7 months

python3.5.3: xmlrpc_net unit test fail

by Nikita Gupta

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

2 years, 7 months

Possible undefined behavior on creating a method named "__dict__"

by Joao S. O. Bueno

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 -><-

2 years, 7 months

Reminder: 2018 Python Language Summit signups close next week

by Larry Hastings

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

2 years, 7 months

Re: [Python-Dev] Are undocumented functions part of the stable ABI?

by Jeroen Demeyer

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()?

2 years, 7 months

Re: [Python-Dev] Are undocumented functions part of the stable ABI?

by Jeroen Demeyer

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.

2 years, 7 months

Trying to build from source, test-poplib fails

by Skip Montanaro

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

2 years, 7 months

Is it useful to update cgitb module?

by Stéphane Blondon

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

2 years, 7 months

Re: [Python-Dev] Soliciting comments on the future of the cmdmodule (bpo-33233)

by Paul Moore

On 7 April 2018 at 04:13, Steve Dower <steve.dower(a)python.org> wrote: > Better to deprecate it before it becomes broken, in my opinion. > > Having someone willing and able to review and merge changes is the best > criteria for whether a module is still supported or not. I think there's a difference between not being willing to add enhancements, and not fixing bugs. The issue that originally triggered this discussion was an enhancement request, and I don't think it's unreasonable to declare cmd as "stable - no further enhancements will be made or accepted" while still considering it as supported for bugfixes. If significant bugs in cmd are remaining unfixed, then that's a somewhat different matter. The fact that pdb uses it, and the advantage of having something in the stdlib for users without easy access to "pip install", *plus* the general principle of "if it isn't broken, don't fix it" make me feel that the best solution would be to document that extended replacements such as cmd2 exist in PyPI, but retain cmd as supported but not (in principle) accepting further enhancements (leaving the door open for interested core devs to merge enhancements on a case by case basis if they have a personal interest in doing so). Paul

2 years, 7 months

Re: [Python-Dev] Are undocumented functions part of the stable ABI?

by Jeroen Demeyer

On 2018-04-04 17:56, Guido van Rossum wrote: > It would be helpful if you explained the context of your request. The context is PEP 575. I guess my question is mostly about PyCFunction_Check(). I will not be able to keep it 100% backwards compatible simply because the goal of that PEP is precisely changing the classes of some objects. Now the question is: am I allowed to change the implementation of PyCFunction_Check()? If it's considered part of the stable ABI, then the answer is immediately "no". By the way, does anybody happen to know why the PyCFunction_* functions are undocumented? Is it just an oversight in the docs or is it intentional? But regardless of the context, I think that the question "Are undocumented functions part of the stable ABI?" should be answered in PEP 384. Jeroen.

2 years, 7 months

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Python-Dev April 2018