Mailman 3 August 2015 - Python-Dev

PEP 498 f-string: is it a preprocessor?
by Victor Stinner 11 Aug '15

11 Aug '15

Hi, I read the PEP but I don't understand how it is implemented. For me, it should be a simple preprocessor: - f'x={x}' is replaced with 'x={0}'.format(x) by the compiler - f'x={1+1}' is replaced with 'x={0}'.format(1+1) - f'x={foo()!r}' is replaced with 'x={0!r}'.format(foo()) - ... That's all. No new language, no new function or method. It's unclear to me if arbitrary expressions should be allowed or not. If not, we may pass parameters by keywords instead: f'x={x}' is replaced with 'x={x}'.format(x=x) by the compiler '...'.format(...) is highly optimized. In the current PEP, I see that each parameter is rendered in its own independent buffer (.__format__() method called multiple times) and then concateneted by ''.join(...). It's less efficient that using a single call to .format(). Victor PS: it looks like the gmail application changed the font size in the middle of my email. I don't know how to use plain text, sorry about that.

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PEP 498 f-string: please remove the special case for spaces
by Victor Stinner 11 Aug '15

11 Aug '15

PEP 498: """ Leading whitespace in expressions is skipped <https://www.python.org/dev/peps/pep-0498/#id28> Because expressions may begin with a left brace ('{'), there is a problem when parsing such expressions. For example: >>> f'{{k:v for k, v in [(1, 2), (3, 4)]}}' '{k:v for k, v in [(1, 2), (3, 4)]}' """ For me, this example is crazy. You should not add a special case (ignore spaces) just to support a corner case. This example can easily be rewritten using a temporary variable and it makes the code simpler. items={k:v for k, v in [(1, 2), (3, 4)]; f'{items}' Seriously, a dict-comprehension inside a f-string should be considered as an abuse of the feature. Don't you think so? Victor

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Instructions on the new "push request" workflow for 3.5.0rc1+ through 3.5.0 final
by Larry Hastings 11 Aug '15

11 Aug '15

As of Python 3.5.0rc1, the canonical repository for Python 3.5.0 is *no longer* on hg.python.org. Instead, it's hosted on Bitbucket on my personal account, here: https://bitbucket.org/larry/cpython350 Since 3.5.0rc1 isn't out yet I'm keeping the repository private for now. Once 3.5.0 rc1 is released (hopefully Monday) I'll flip the switch and make the repository public. (I'll email python-dev and python-committers when that happens.) Putting it succinctly, here's a table of versions and where you'd check in for your change to go there: 3.5.0 : https://bitbucket.org/larry/cpython350 (branch "3.5") 3.5.1 : hg.python.org/cpython (branch "3.5") 3.6.0 : hg.python.org/cpython (branch "default") You'll notice nobody but myself has checkin permissions for my 3.5.0 repo on Bitbucket. That's on purpose. The only way you can get changes in to 3.5.0 now is by sending me a Bitbucket "pull request". This is a workflow experiment, to see if we as a community like this sort of new-fangled gizmo. For now, we're only using Bitbucket for the actual final checking-in stage. Requests for fixes to be accepted into 3.5.0 and code review will all still happen on the Python issue tracker. Also, I'm officially now asking you folks to do the forward-merge into 3.5.1 and 3.6.0 yourselves. Here's how to get a fix checked in for 3.5.0, starting with 3.5.0rc1+ and continuing through until 3.5.0 final. Pre-requisites: * You must have a Bitbucket account. * You must have commit rights to the CPython repository. 1. Create an issue on the Python issue tracker for the problem. 2. Submit a patch that fixes the problem. 3. Add me to the issue and get me to agree that it needs fixing in 3.5.0. (You can attempt this step before 2 if you prefer.) 4. Fork my repository into your Bitbucket account using their web GUI. To do that, go to Bitbucket, log in, then go to my 3.5.0 repo: https://bitbucket.org/larry/cpython350 and press the "Fork" link in the left column. Bitbucket has a tutorial on how to do this, here: https://confluence.atlassian.com/display/BITBUCKET/Fork+a+teammate%27s+repo… Note: DO NOT start with a conventional CPython trunk cloned from hg.python.org. The 3.5 branch in my repo and the 3.5 branch in normal CPython trunk have intentionally diverged and *need* to stay out-of-sync. 5. Make a local clone of your fork on your computer. Bitbucket has a tutorial on how to do that, here: https://confluence.atlassian.com/display/BITBUCKET/Copy+your+Mercurial+repo… Reminder: switch to the 3.5 branch! 6. Apply your change to the 3.5 branch and check in. Reminder: check in to the 3.5 branch! 7. Make sure you checked in your change to the 3.5 branch. Reminder: Seriously. I keep messing this up. I say, the more reminders, the better. 8. Push your change back to *your* fork on *your* Bitbucket account. Just normal "hg push" should work here. In case it helps, I recommend using the "https" protocol for this step, as it sidesteps ssh authentication and prompts you for your Bitbucket username and password. 9. Create a pull request using Bitbucket's web GUI. Bitbucket has a tutorial on how to create a pull request, here: https://confluence.atlassian.com/display/BITBUCKET/Create+a+pull+request On the "Create pull request" web GUI, make sure that you specify branch "3.5" for *both* your repo *and* my repo. Also, make sure you *don't* check the "Close 3.5 after the pull request is merged" check box. (If you use the "Compare" page, you also need to select "3.5" in both drop-down lists--one for my repo, and one for yours.) 10. Paste a link to the pull request into the issue tracker issue for this change request. 11. Wait for confirmation that I've accepted your pull request into the 3.5.0 repo. 12. Pull your accepted change from your local Bitbucket fork repo into a normal hg.cpython.org CPython repo, merge into 3.5, then merge into 3.6, then push. For the record, here's what *my* workflow looks like when I accept your pull request: 1. Click on the URL you pasted into the pull request. 2. Visually check that the diff matches the approved diff in the issue on the issue tracker. 3. Click on the "Merge" button. Frequently Asked Questions ========================== Q: What if someone sends me a "pull request" for a change that doesn't merge cleanly? A: Then I'll decline it, and ask you on the issue tracker to rebase and resubmit. Q: What if someone sends me a "pull request" but they don't have commit rights to CPython? A: I'll ignore it. I'll only pay attention to pull requests pasted into the issue tracker by someone with commit rights. Q: Whose name goes on the commit? A: It gets the name the checkin was made with. Don't worry, your name will stay on your commit. Q: This seems like a lot more work than the old way. A: For you guys, yes. But notice how little work it is for *me*! Seriously. Q: Can I reuse my fork / my local copy? Or do I have to create a fresh one each time? A: I don't care either way. All I care about are clean pull requests. If you're careful you should have no trouble reusing forks and local checkouts. If it were me, I'd probably use a fresh fork each time. Forks are cheap and this way is cleaner. I'll add these instructions to the Python Dev Guide in the next day or two. /arry p.s. Remember to use the 3.5 branch!

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[RELEASED] Python 3.5.0rc1 is now available
by Larry Hastings 11 Aug '15

11 Aug '15

On behalf of the Python development community and the Python 3.5 release team, I'm relieved to announce the availability of Python 3.5.0rc1, also known as Python 3.5.0 Release Candidate 1. Python 3.5 has now entered "feature freeze". By default new features may no longer be added to Python 3.5. This is a preview release, and its use is not recommended for production settings. You can find Python 3.5.0rc1 here: https://www.python.org/downloads/release/python-350rc1/ Windows and Mac users: please read the important platform-specific "Notes on this release" section near the end of that page. Happy hacking, /arry

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Branch Prediction And The Performance Of Interpreters - Don't Trust Folklore
by Larry Hastings 10 Aug '15

10 Aug '15

This just went by this morning on reddit's /r/programming. It's a paper that analyzed Python--among a handful of other languages--to answer the question "are branch predictors still that bad at the big switch statement approach to interpreters?" Their conclusion: no. Our simulations [...] show that, as long as the payload in the bytecode remains limited and do not feature significant amount of extra indirect branches, then the misprediction rate on the interpreter can be even become insignificant (less than 0.5 MPKI). (MPKI = missed predictions per thousand instructions) Their best results were on simulated hardware with state-of-the-art prediction algorithms ("TAGE" and "ITTAGE"), but they also demonstrate that branch predictors in real hardware are getting better quickly. When running the Unladen Swallow test suite on Python 3.3.2, compiled with USE_COMPUTED_GOTOS turned off, Intel's Nehalem experienced an average of 12.8 MPKI--but Sandy Bridge drops that to 3.5 MPKI, and Haswell reduces it further to a mere *1.4* MPKI. (AFAICT they didn't compare against Python 3.3.2 using computed gotos, either in terms of MPKI or in overall performance.) The paper is here: https://hal.inria.fr/hal-01100647/document I suppose I wouldn't propose removing the labels-as-values opcode dispatch code yet. But perhaps that day is in sight! //arry/

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Python 3.5.0rc1 is delayed by a day
by Larry Hastings 10 Aug '15

10 Aug '15

We retagged Python 3.5.0rc1 today to fix two bugs that popped up late in the process. Release candidates are supposed to be software you genuinely would release, and I couldn't release Python with both those bugs. This delay rippled through the whole process, so it just isn't going out tonight (late Sunday / early Monday in my timezone). I have every expectation it'll go out Monday. In case you're interested, the bugs are (were!): http://bugs.python.org/issue24745 http://bugs.python.org/issue24835 My thanks to the folks who stepped up and fixed the bugs on short notice, and my apologies to the community for the delay. We're just trying to make the best Python we can, for yooooooooou! See you tomorrow, //arry/

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Reminder: the "3.5" branch in CPython trunk is now 3.5.1
by Larry Hastings 09 Aug '15

09 Aug '15

As I write this email I'm tagging Python 3.5.0 release candidate 1. This is the moment that we switch over to our new experimental workflow, where we use Bitbucket and pull requests for all future changesets that will get applied to 3.5.0. The Bitbucket repository isn't ready yet, and I'm still putting the final touches on the documentation for the process. I'll have everything ready no later than a day from now. It'll be posted here, and will also go into the Python Dev Guide. For now changes for 3.5.0rc2 will just have to wait. Again: any revisions you check in to the "3.5" branch on hg.python.org/cpython right now will go automatically into 3.5.1. They will *not* automatically go in to 3.5.0. The only way to get changes into 3.5.0 from this moment forward is by creating a pull request on Bitbucket which you convince me to accept. //arry/ p.s. In case you're curious, the last revision to make it in to 3.5.0rc1 (apart from the revisions I generate as part of my build engineering work) was 202a7aabd4fe.

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SSH to hg.p.o okay?
by Steve Dower 08 Aug '15

08 Aug '15

Is hg.python.org okay for others? I'm getting the following output from all hg commands: sending hello command sending between command abort: no suitable response from remote hg! I don't know of any more verbose or debugging options than that (--debug, -v's added nothing). I can SSH normally into hg.p.o, not that there's anything I can do without a terminal, but I guess it's not completely down...

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Summary of Python tracker Issues
by Python tracker 07 Aug '15

07 Aug '15

ACTIVITY SUMMARY (2015-07-31 - 2015-08-07) 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 4992 (+31) closed 31595 (+32) total 36587 (+63) Open issues with patches: 2245 Issues opened (55) ================== #24759: Idle: add ttk widgets as an option http://bugs.python.org/issue24759 reopened by terry.reedy #24764: cgi.FieldStorage can't parse multipart part headers with Conte http://bugs.python.org/issue24764 opened by Peter Landry #24765: Move .idlerc to %APPDATA%\IDLE on Windows http://bugs.python.org/issue24765 opened by jan parowka #24766: Subclass of property doesn't preserve instance __doc__ when us http://bugs.python.org/issue24766 opened by erik.bray #24767: can concurrent.futures len(Executor) return the number of task http://bugs.python.org/issue24767 opened by Pat Riehecky #24769: Interpreter doesn't start when dynamic loading is disabled http://bugs.python.org/issue24769 opened by Jeffrey.Armstrong #24770: Py_Finalize not cleaning up all threads http://bugs.python.org/issue24770 opened by Alex Budovski #24772: Smaller viewport shifts the "expand left menu" character into http://bugs.python.org/issue24772 opened by karlcow #24773: Add local time disambiguation flag to datetime http://bugs.python.org/issue24773 opened by belopolsky #24774: inconsistency in http.server.test http://bugs.python.org/issue24774 opened by wdv4758h #24775: Python client failing to connect to server but completing as i http://bugs.python.org/issue24775 opened by Seán Kelleher #24776: Improve Fonts/Tabs UX for IDLE http://bugs.python.org/issue24776 opened by rhettinger #24778: mailcap.findmatch: document shell command Injection danger in http://bugs.python.org/issue24778 opened by TheRegRunner #24779: Python/ast.c: decode_unicode is never called with rawmode=True http://bugs.python.org/issue24779 opened by eric.smith #24780: unittest assertEqual difference output foiled by newlines http://bugs.python.org/issue24780 opened by chris.jerdonek #24781: Improve UX of IDLE Highlighting configuration tab http://bugs.python.org/issue24781 opened by markroseman #24782: Merge 'configure extensions' into main IDLE config dialog http://bugs.python.org/issue24782 opened by markroseman #24783: Import Error (undefined symbol: PyFloat_Type) when Importing m http://bugs.python.org/issue24783 opened by david-narvaez #24784: Build fails --without-threads http://bugs.python.org/issue24784 opened by louis.dassy #24786: Changes in the devguide repository are not published online in http://bugs.python.org/issue24786 opened by jcea #24787: csv.Sniffer guesses "M" instead of \t or , as the delimiter http://bugs.python.org/issue24787 opened by Tiago Wright #24788: HTTPException is derived from Exception instead of IOError http://bugs.python.org/issue24788 opened by Pastafarianist #24789: ctypes doc string http://bugs.python.org/issue24789 opened by LambertDW #24790: Idle: improve stack viewer http://bugs.python.org/issue24790 opened by terry.reedy #24792: zipimporter masks import errors http://bugs.python.org/issue24792 opened by Amund Hov #24794: PyZipFile mixes compiled files from different python versions. http://bugs.python.org/issue24794 opened by Amund Hov #24795: Make event loops with statement context managers http://bugs.python.org/issue24795 opened by Mathias Fröjdman #24796: Deleting names referencing from enclosed and enclosing scopes http://bugs.python.org/issue24796 opened by ncoghlan #24798: _msvccompiler.py doesn't properly support manifests http://bugs.python.org/issue24798 opened by gladman #24799: IDLE should detect changes to open files by other processes http://bugs.python.org/issue24799 opened by Al.Sweigart #24800: exec docs should note that the no argument form in a local sco http://bugs.python.org/issue24800 opened by Peter Eastman #24801: right-mouse click in IDLE on Mac doesn't work http://bugs.python.org/issue24801 opened by markroseman #24802: PyFloat_FromString Buffer Over-read http://bugs.python.org/issue24802 opened by JohnLeitch #24803: PyNumber_Long Buffer Over-read.patch http://bugs.python.org/issue24803 opened by JohnLeitch #24805: Python installer having problem in installing Python for all u http://bugs.python.org/issue24805 opened by Debarshi.Goswami #24806: Inheriting from NoneType does not fail consistently http://bugs.python.org/issue24806 opened by brechtm #24807: compileall can cause Python installation to fail http://bugs.python.org/issue24807 opened by Jon Ribbens #24808: PyTypeObject fields have incorrectly documented types http://bugs.python.org/issue24808 opened by Joseph Weston #24809: Add getprotobynumber to socket module http://bugs.python.org/issue24809 opened by wbooth #24810: UX mode for IDLE targeted to 'new learners' http://bugs.python.org/issue24810 opened by markroseman #24812: All standard keystrokes not recognized in IDLE dialogs on Mac http://bugs.python.org/issue24812 opened by markroseman #24813: About IDLE dialog shouldn't be modal http://bugs.python.org/issue24813 opened by markroseman #24814: Disable Undo/Redo menu items when not applicable http://bugs.python.org/issue24814 opened by markroseman #24815: IDLE can lose menubar on OS X http://bugs.python.org/issue24815 opened by markroseman #24816: don't allow selecting IDLE debugger menu item when running http://bugs.python.org/issue24816 opened by markroseman #24817: disable format menu items when not applicable http://bugs.python.org/issue24817 opened by markroseman #24818: no way to run program in debugger from edit window http://bugs.python.org/issue24818 opened by markroseman #24819: replace window size preference with just use last window size http://bugs.python.org/issue24819 opened by markroseman #24820: IDLE themes for light on dark http://bugs.python.org/issue24820 opened by markroseman #24821: The optimization of string search can cause pessimization http://bugs.python.org/issue24821 opened by serhiy.storchaka #24822: IDLE: Accelerator key doesn't work for Options http://bugs.python.org/issue24822 opened by serhiy.storchaka #24823: ctypes.create_string_buffer does not add NUL if len(init) == s http://bugs.python.org/issue24823 opened by tom.pohl #24824: Pydoc fails with codecs http://bugs.python.org/issue24824 opened by serhiy.storchaka #24825: visual margin indicator for breakpoints in IDLE http://bugs.python.org/issue24825 opened by markroseman #24826: ability to integrate editor, shell, debugger in one window http://bugs.python.org/issue24826 opened by markroseman Most recent 15 issues with no replies (15) ========================================== #24826: ability to integrate editor, shell, debugger in one window http://bugs.python.org/issue24826 #24825: visual margin indicator for breakpoints in IDLE http://bugs.python.org/issue24825 #24824: Pydoc fails with codecs http://bugs.python.org/issue24824 #24823: ctypes.create_string_buffer does not add NUL if len(init) == s http://bugs.python.org/issue24823 #24822: IDLE: Accelerator key doesn't work for Options http://bugs.python.org/issue24822 #24821: The optimization of string search can cause pessimization http://bugs.python.org/issue24821 #24820: IDLE themes for light on dark http://bugs.python.org/issue24820 #24819: replace window size preference with just use last window size http://bugs.python.org/issue24819 #24818: no way to run program in debugger from edit window http://bugs.python.org/issue24818 #24817: disable format menu items when not applicable http://bugs.python.org/issue24817 #24816: don't allow selecting IDLE debugger menu item when running http://bugs.python.org/issue24816 #24815: IDLE can lose menubar on OS X http://bugs.python.org/issue24815 #24814: Disable Undo/Redo menu items when not applicable http://bugs.python.org/issue24814 #24813: About IDLE dialog shouldn't be modal http://bugs.python.org/issue24813 #24812: All standard keystrokes not recognized in IDLE dialogs on Mac http://bugs.python.org/issue24812 Most recent 15 issues waiting for review (15) ============================================= #24809: Add getprotobynumber to socket module http://bugs.python.org/issue24809 #24808: PyTypeObject fields have incorrectly documented types http://bugs.python.org/issue24808 #24803: PyNumber_Long Buffer Over-read.patch http://bugs.python.org/issue24803 #24802: PyFloat_FromString Buffer Over-read http://bugs.python.org/issue24802 #24798: _msvccompiler.py doesn't properly support manifests http://bugs.python.org/issue24798 #24784: Build fails --without-threads http://bugs.python.org/issue24784 #24782: Merge 'configure extensions' into main IDLE config dialog http://bugs.python.org/issue24782 #24774: inconsistency in http.server.test http://bugs.python.org/issue24774 #24773: Add local time disambiguation flag to datetime http://bugs.python.org/issue24773 #24766: Subclass of property doesn't preserve instance __doc__ when us http://bugs.python.org/issue24766 #24764: cgi.FieldStorage can't parse multipart part headers with Conte http://bugs.python.org/issue24764 #24756: doctest run_docstring_examples does have an obvious utility http://bugs.python.org/issue24756 #24750: IDLE: Cosmetic improvements for main window http://bugs.python.org/issue24750 #24746: doctest 'fancy diff' formats incorrectly strip trailing whites http://bugs.python.org/issue24746 #24733: Logically Dead Code http://bugs.python.org/issue24733 Top 10 most discussed issues (10) ================================= #24383: consider implementing __await__ on concurrent.futures.Future http://bugs.python.org/issue24383 26 msgs #24750: IDLE: Cosmetic improvements for main window http://bugs.python.org/issue24750 15 msgs #24787: csv.Sniffer guesses "M" instead of \t or , as the delimiter http://bugs.python.org/issue24787 13 msgs #15944: memoryviews and ctypes http://bugs.python.org/issue15944 12 msgs #24759: Idle: add ttk widgets as an option http://bugs.python.org/issue24759 12 msgs #24778: mailcap.findmatch: document shell command Injection danger in http://bugs.python.org/issue24778 11 msgs #24272: PEP 484 docs http://bugs.python.org/issue24272 10 msgs #22329: Windows installer can't recover partially installed state http://bugs.python.org/issue22329 9 msgs #24667: OrderedDict.popitem()/__str__() raises KeyError http://bugs.python.org/issue24667 8 msgs #23672: IDLE can crash if file name contains non-BMP Unicode character http://bugs.python.org/issue23672 7 msgs Issues closed (32) ================== #4395: Document auto __ne__ generation; provide a use case for non-tr http://bugs.python.org/issue4395 closed by rbcollins #20557: Use specific asserts in io tests http://bugs.python.org/issue20557 closed by serhiy.storchaka #20769: Reload() description is unclear http://bugs.python.org/issue20769 closed by rbcollins #21192: Idle: Print filename when running a file from editor http://bugs.python.org/issue21192 closed by terry.reedy #21279: str.translate documentation incomplete http://bugs.python.org/issue21279 closed by python-dev #22397: test_socket failure on AIX http://bugs.python.org/issue22397 closed by r.david.murray #22932: email.utils.formatdate uses unreliable time.timezone constant http://bugs.python.org/issue22932 closed by rbcollins #23004: mock_open() should allow reading binary data http://bugs.python.org/issue23004 closed by berker.peksag #23182: Update grammar tests to use new style for annotated function d http://bugs.python.org/issue23182 closed by python-dev #23524: Use _set_thread_local_invalid_parameter_handler in posixmodule http://bugs.python.org/issue23524 closed by rbcollins #23652: ifdef uses of EPOLLxxx macros so we can compile on systems tha http://bugs.python.org/issue23652 closed by python-dev #23812: asyncio.Queue.put_nowait(), followed get() task cancellation l http://bugs.python.org/issue23812 closed by yselivanov #23888: Fixing fractional expiry time bug in cookiejar http://bugs.python.org/issue23888 closed by rbcollins #24021: Add docstring to urllib.urlretrieve http://bugs.python.org/issue24021 closed by rbcollins #24129: Incorrect (misleading) statement in the execution model docume http://bugs.python.org/issue24129 closed by ncoghlan #24217: O_RDWR undefined in mmapmodule.c http://bugs.python.org/issue24217 closed by python-dev #24370: OrderedDict behavior is unclear with misbehaving keys. http://bugs.python.org/issue24370 closed by eric.snow #24531: please document that no code preceding encoding declaration is http://bugs.python.org/issue24531 closed by rbcollins #24720: Python install help http://bugs.python.org/issue24720 closed by zach.ware #24745: Better default font for editor http://bugs.python.org/issue24745 closed by terry.reedy #24751: regrtest/buildbot: test run marked as failure even when re-run http://bugs.python.org/issue24751 closed by python-dev #24754: argparse add_argument with action="store_true", type=bool shou http://bugs.python.org/issue24754 closed by dbagnall #24762: Branchless, vectorizable frozen set hash http://bugs.python.org/issue24762 closed by rhettinger #24768: Bytearray double free or corruption http://bugs.python.org/issue24768 closed by pitrou #24771: Cannot import _tkinter in Python 3.5 on Windows http://bugs.python.org/issue24771 closed by steve.dower #24777: sys.getrefcount takes no arguments http://bugs.python.org/issue24777 closed by berker.peksag #24785: Document asyncio.futures.wrap_future() http://bugs.python.org/issue24785 closed by berker.peksag #24791: *args regression http://bugs.python.org/issue24791 closed by yselivanov #24793: Calling 'python' via subprocess.call ignoring passed %PATH% http://bugs.python.org/issue24793 closed by paul.moore #24797: email.header.decode_header return type is not consistent http://bugs.python.org/issue24797 closed by r.david.murray #24804: https://www.python.org/ftp/python/2.7.4/python-2.7.4.msi actua http://bugs.python.org/issue24804 closed by zach.ware #24811: Unicode character in history breaks history under Windows http://bugs.python.org/issue24811 closed by r.david.murray

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Bitbucket mirror is out-of-date
by Larry Hastings 07 Aug '15

07 Aug '15

Bitbucket has a mirror of cpython, here: https://bitbucket.org/mirror/cpython It was last updated on May 7 and still says it's Python 3.5.0a4. It's not clear to me who owns the "mirror" account--is it Atlassian themselves? Anyway it'd be nice if it were, y'know, fresher. //arry/

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