[issue33118] No clean way to get notified when a Transport's write buffer empties out

New submission from Vitaly Kruglikov : There doesn't appear to be an ordained mechanism for getting notified when a Transport's (or WriteTransport's) write buffer drains to zero (i.e., all output data has been transferred to socket). I don't want to hijack `set_write_buffer_limits()` for this

[issue27212] Doc for itertools, 'islice()' implementation have unwanted behavior for recipe 'consume()'

Raymond Hettinger added the comment: Cheryl, I think you take this one. It hasn't been touched in a long time and Nofar is focused on another issue. -- assignee: Nofar Schnider -> csabella ___ Python tracker __

[issue33108] Unicode char 304 in lowercase has len = 2

Serhiy Storchaka added the comment: Thank you Ma Lin. Closed as a duplicate of issue17252. -- nosy: +serhiy.storchaka resolution: -> duplicate stage: -> resolved status: open -> closed superseder: -> Latin Capital Letter I with Dot Above ___ Pyth

[issue33117] asyncio example uses non-existing/documented method

Change by Ned Deily : -- nosy: +asvetlov, giampaolo.rodola, yselivanov ___ Python tracker ___ ___ Python-bugs-list mailing list Unsub

[issue33053] Avoid adding an empty directory to sys.path when running a module with `-m`

Ned Deily added the comment: I am OK with changing '' to the initial resolved working directory for 3.7 as long as we get that change in now, i.e. before the 3.7.0b3 ABI freeze next Monday. And I agree that we should not attempt to change this behavior for 3.6.x at this stage of its life cyc

[issue33108] Unicode char 304 in lowercase has len = 2

Ma Lin added the comment: There was a discussion about "Latin Capital Letter I with Dot Above" https://bugs.python.org/issue17252 -- nosy: +Ma Lin ___ Python tracker ___ __

[issue32505] dataclasses: make field() with no annotation an error

Eric V. Smith added the comment: But surely when you instantiate this: c = C(1) you'll notice that's an error? -- ___ Python tracker ___ _

[issue33108] Unicode char 304 in lowercase has len = 2

INADA Naoki added the comment: Maybe, we should update UnicodeData? -- ___ Python tracker ___ ___ Python-bugs-list mailing list Unsu

[issue33018] Improve issubclass() error checking and message

Ivan Levkivskyi added the comment: > Would you merge this into master? OK, I played with this a bit and it looks good. There is however a merge conflict now, and a NEWS item is missing. I will leave a comment in the PR. -- ___ Python tracker

[issue33110] Adding a done callback to a concurrent.futures Future once it has already completed, may raise an exception, contrary to docs

Change by Ned Deily : -- nosy: +bquinlan, pitrou ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.

[issue32505] dataclasses: make field() with no annotation an error

Ivan Levkivskyi added the comment: Some part of the discussion is in https://bugs.python.org/issue32428 I still think it is important to flag things like this as an error: @dataclass class C: x = field() This is a big bug magnet. Especially taking into account that attrs behave in the op

[issue32505] dataclasses: make field() with no annotation an error

Guido van Rossum added the comment: Fine to close as wontfix. -- ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscrib

[issue32505] dataclasses: make field() with no annotation an error

Eric V. Smith added the comment: I'm not sure this is worth preventing. I can certainly make it an error, but since dataclasses ignores anything without a type annotation, I don't think it's a big deal. Basically I'd have to look through all class attributes that are of type Field but aren't

[issue33116] Field is not exposed in dataclasses.__all__

Change by Eric V. Smith : -- resolution: -> fixed stage: patch review -> resolved status: open -> closed ___ Python tracker ___ ___

[issue33116] Field is not exposed in dataclasses.__all__

Eric V. Smith added the comment: New changeset 4ddc99d15963b0374f9dbfd57f14e6194ad65669 by Eric V. Smith (Miss Islington (bot)) in branch '3.7': bpo-33116: Add 'Field' to dataclasses.__all__. (GH-6182) (GH-6183) https://github.com/python/cpython/commit/4ddc99d15963b0374f9dbfd57f14e6194ad65669

[issue33078] Queue with maxsize can lead to deadlocks

Ned Deily added the comment: (Fot the record, PR 6181 was the 3.7 backport of PR 6180.) -- ___ Python tracker ___ ___ Python-bugs-li

[issue33116] Field is not exposed in dataclasses.__all__

Change by miss-islington : -- pull_requests: +5931 ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mai

[issue33117] asyncio example uses non-existing/documented method

New submission from Henrique Fingler : In the documentation of asyncio.run_coroutine_threadsafe(coro, loop), in Section 19.5.3.6 (https://docs.python.org/3/library/asyncio-task.html#asyncio.run_coroutine_threadsafe), the example code does the following: future = asyncio.run_coroutine_thre

[issue33116] Field is not exposed in dataclasses.__all__

Change by Eric V. Smith : -- keywords: +patch pull_requests: +5930 stage: -> patch review ___ Python tracker ___ ___ Python-bugs-lis

[issue33116] Field is not exposed in dataclasses.__all__

New submission from Eric V. Smith : 'Field' needs to be added to __all__. -- assignee: eric.smith messages: 314222 nosy: eric.smith priority: normal severity: normal status: open title: Field is not exposed in dataclasses.__all__ type: behavior versions: Python 3.7, Python 3.8 _

[issue28677] difficult to parse sentence structure in "When an instance attribute is referenced that isn't a data attribute"

Change by Steven Downum : -- nosy: +steven.downum ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail

[issue33111] Merely importing tkinter breaks parallel code (multiprocessing, sharedmem)

Change by Ethan Welty : -- components: +macOS ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.pyt

[issue33078] Queue with maxsize can lead to deadlocks

Antoine Pitrou added the comment: Good, I think we can close again now! -- resolution: -> fixed stage: patch review -> resolved status: open -> closed ___ Python tracker ___ _

[issue15248] Better explain "TypeError: 'tuple' object is not callable"

Serhiy Storchaka added the comment: Actually the precedence was a warning for an assert like: assert(x % 2 == 0, "x is odd") Currently it is the only syntax warning produced by the compiler. > 1. Why 'chech' instead of 'check'? Just a typo replicated with a copy-paste. > 2. Will chech_i

[issue33078] Queue with maxsize can lead to deadlocks

Ned Deily added the comment: PR 6180 appears to have fixed the 3.x failures, thanks! -- ___ Python tracker ___ ___ Python-bugs-list

[issue15248] Better explain "TypeError: 'tuple' object is not callable"

Terry J. Reedy added the comment: Reviewing Serhiy's patch, I changed my mind from 6 years ago (msg164774). I may have over-estimated the difficulty; in any case the code patch is written. (Tests are still needed.) And the code is rather straightforward and readable. Beyond that, I see the

[issue33111] Merely importing tkinter breaks parallel code (multiprocessing, sharedmem)

Ethan Welty added the comment: I've tried with additional backends: WX, WXAgg, WXCairo, Qt5Agg (in matplotlib speak). With these, I can at least import matplotlib.pyplot, but as soon as say matplotlib.pyplot.plot is called and the backend is loaded, the code breaks (error message for WXAgg b

[issue33115] Asyncio loop blocks with a lot of parallel tasks

Yury Selivanov added the comment: The "blocking" you observe is caused by Python GC. If I add "import gc; gc.disable()" the warnings disappear. -- ___ Python tracker ___

[issue33115] Asyncio loop blocks with a lot of parallel tasks

Marat Sharafutdinov added the comment: But why if I use multiprocessing (run 100 tasks by 100 workers) it still continue blocking loop within some workers? Are 100 tasks "a lot of work" for asyncio loop? ```python import asyncio from multiprocessing import Process worker_count = 100 task_cou

[issue33053] Avoid adding an empty directory to sys.path when running a module with `-m`

Brett Cannon added the comment: The proposed change for 3.8 and 3.7 seems reasonable to me. -- ___ Python tracker ___ ___ Python-bug

[issue9338] argparse optionals with nargs='?', '*' or '+' can't be followed by positionals

TD22057 added the comment: Is there any chance this will ever get fixed? Patches have been available for 5 years with no progress. -- ___ Python tracker ___ __

[issue33111] Merely importing tkinter breaks parallel code (multiprocessing, sharedmem)

Ethan Welty added the comment: I have tried running the script with: - command line (python ): Works without (breaks with) `import _tkinter`. - basic python console (python): Same as with command line. - ipython: Fails with or without `import _tkinter`. However, if for example I make the matri

[issue33078] Queue with maxsize can lead to deadlocks

Change by Thomas Moreau : -- pull_requests: +5929 stage: needs patch -> patch review ___ Python tracker ___ ___ Python-bugs-list mail

[issue33078] Queue with maxsize can lead to deadlocks

Ned Deily added the comment: Buildbots are failing on macOS: http://buildbot.python.org/all/#/builders/14/builds/804/steps/4/logs/stdio http://buildbot.python.org/all/#/builders/93/builds/459/steps/4/logs/stdio -- nosy: +ned.deily resolution: fixed -> stage: resolved -> needs patch st

[issue33078] Queue with maxsize can lead to deadlocks

Antoine Pitrou added the comment: New changeset bb5b5291971c104ea773db1a30e46d410b6b3e1e by Antoine Pitrou (Miss Islington (bot)) in branch '3.7': bpo-33078 - Fix queue size on pickling error (GH-6119) (GH-6178) https://github.com/python/cpython/commit/bb5b5291971c104ea773db1a30e46d410b6b3e1e

[issue33078] Queue with maxsize can lead to deadlocks

Change by Antoine Pitrou : -- resolution: -> fixed stage: patch review -> resolved status: open -> closed ___ Python tracker ___ ___

[issue33115] Asyncio loop blocks with a lot of parallel tasks

Yury Selivanov added the comment: Well, there's nothing we can do here, it's just a lot of work for a single-threaded process to get a 1 tasks going. You'll get the same picture in any other async Python framework. -- ___ Python tracker

[issue33078] Queue with maxsize can lead to deadlocks

Change by Antoine Pitrou : -- versions: -Python 2.7, Python 3.5, Python 3.6 ___ Python tracker ___ ___ Python-bugs-list mailing list

[issue33078] Queue with maxsize can lead to deadlocks

Antoine Pitrou added the comment: New changeset e2f33add635df4fde81be9960bab367e010c19bf by Antoine Pitrou (Thomas Moreau) in branch 'master': bpo-33078 - Fix queue size on pickling error (GH-6119) https://github.com/python/cpython/commit/e2f33add635df4fde81be9960bab367e010c19bf --

[issue33078] Queue with maxsize can lead to deadlocks

Change by miss-islington : -- pull_requests: +5928 ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mai

[issue33115] Asyncio loop blocks with a lot of parallel tasks

New submission from Marat Sharafutdinov : I want to schedule a lot of parallel tasks, but it becomes slow with loop blocking: ```python import asyncio task_count = 1 async def main(): for x in range(1, task_count + 1): asyncio.ensure_future(f(x)) async def f(x): if x % 10

[issue33114] random.sample() behavior is unexpected/unclear from docs

Scott Eilerman added the comment: Sorry, there's a typo in that example. It should look like: random.seed(fixed_seed) random.sample(choices, n)[-1] Then, later, I want the next draw, so I did: random.seed(fixed_seed) random.sample(choices, n+1)[-1] -- __

[issue33114] random.sample() behavior is unexpected/unclear from docs

Scott Eilerman added the comment: To clarify the use case where this behavior was problematic for me, I wanted to get the nth random draw from a given distribution, so I used something like: random.seed(fixed_seed) random.sample(choices, n)[-1] Then, later, I want the next draw, so I did: ra

[issue33114] random.sample() behavior is unexpected/unclear from docs

Scott Eilerman added the comment: Something along the lines of: "For a fixed seed, random.sample(population, k) is not guaranteed to return the same samples for different values of k." -- ___ Python tracker

[issue33103] Syntax to get multiple arbitrary items from an sequence

Raymond Hettinger added the comment: Please leave this closed -- there is no chance that this will go forward on the bug tracker. It would first need to be thoroughly discussed on the python-ideas mail list. -- status: open -> closed title: Syntax to get multiple arbitrary items from

[issue33114] random.sample() behavior is unexpected/unclear from docs

Raymond Hettinger added the comment: What additional wording do you propose? -- assignee: docs@python -> rhettinger nosy: +rhettinger ___ Python tracker ___ ___

[issue33114] random.sample() behavior is unexpected/unclear from docs

New submission from Scott Eilerman : I ran into a "bug" when using random.sample() in which I got some results I didn't expect. After digging a little more, this is either a side effect of the optimization that's made when k > 5, or I am using the function in a way that wasn't intended. If th

[issue33102] get the nth folder of a given path

Eric V. Smith added the comment: Yes, it's cross platform. For a plain string version, you can use a utility function: >>> for i in range(n+1): ... path = os.path.dirname(path) ... I'm not sure it's worth adding this to os.path. -- ___ Python tr

[issue33102] get the nth folder of a given path

AmjadHD added the comment: Yes but i dont know if this is cross platform solution, i guess this function should be in the os.path module. -- ___ Python tracker ___ ___

[issue33018] Improve issubclass() error checking and message

Guido van Rossum added the comment: OTOH if we don't do this now, it's not going to be any easier to make this change in 3.8. Maybe now's the time to experiment with it, and we can drop it in rc1 if it causes problems. @Ivan, your thoughts? Would you merge this into master? --

[issue15248] Better explain "TypeError: 'tuple' object is not callable"

Serhiy Storchaka added the comment: It is possible to make the compiler producing warnings for such kind of errors. The following sample patch does this. I'm not sure it is worth to do. -- nosy: +serhiy.storchaka ___ Python tracker

[issue15248] Better explain "TypeError: 'tuple' object is not callable"

Change by Serhiy Storchaka : -- keywords: +patch Added file: https://bugs.python.org/file47496/compile-warnings.diff ___ Python tracker ___ _

[issue25345] Unable to install Python 3.5 on Windows 10

Arran McCutcheon added the comment: No problem Steve, I found the solution! I downloaded 'Windows Repair' from tweaking.com, and then used it to repair only the MSI installer. So I've now installed Python correctly. Thanks again for your help! -- _

[issue33103] Syntax to get multiple arbitrary items from an iterable

AmjadHD added the comment: Yes that's a way to do it but "a, b, c = my_list[1, 3, -1]" seems so pythonic and straight forward, it's like formatting, python had already 3 methods to do it when it introduced a 4th one (f-strings), easier is better especially in python. -- status: close

[issue33042] New 3.7 startup sequence crashes PyInstaller

Nick Coghlan added the comment: Thinking about PySys_AddWarnOptionUnicode a little further, I'm not sure we actually need to change anything in the implementation there - I think we can just make it clearer in the docs that *only* PySys_AddWarnOption is supported prior to Py_Initialize for th

[issue28247] Add an option to zipapp to produce a Windows executable

Change by Cheryl Sabella : -- resolution: -> fixed stage: patch review -> resolved status: open -> closed ___ Python tracker ___ ___

[issue13475] Add '-p'/'--path0' command line option to override sys.path[0] initialisation

Change by Jakub Wilk : -- nosy: +jwilk ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org

[issue13475] Add '-p'/'--path0' command line option to override sys.path[0] initialisation

Nick Coghlan added the comment: Over in https://bugs.python.org/issue33053#msg314192, I came up with `--basepath ` as another possible spelling (`--no-basepath` would then be an option for turning it off. The main argument *against* that name is that we use "base" to mean something different

[issue33053] Avoid adding an empty directory to sys.path when running a module with `-m`

Nick Coghlan added the comment: (Adding the other import system maintainers to the nosy list, along with Ned as the release manager for 3.6 and 3.7) Summarizing my current thoughts on this: I think the fact that "-m" currently adds the empty directory as sys.path[0] instead of the fully reso

[issue33111] Merely importing tkinter breaks parallel code (multiprocessing, sharedmem)

Ronald Oussoren added the comment: I'm fairly sure this is expected behavior on macOS: _tkinter loads the Tk library, which loads Apple GUI frameworks. Those frameworks are not save w.r.t. fork(2) and that can lead to all kinds of unwanted behavior (although I would have expected a more expli

[issue23239] SSL match_hostname does not accept IP Address

Christian Heimes added the comment: #32819 and #32185 have solved the last outstanding bugs with IP address validation and handling. I'm fine with a backport of the feature to 2.7 now. -- assignee: christian.heimes -> versions: -Python 3.5, Python 3.6, Python 3.7 ___

[issue32896] Error when subclassing a dataclass with a field that uses a defaultfactory

Eric V. Smith added the comment: Thanks again for the bug report. This ended up being a simple fix, but an important one. -- resolution: -> fixed stage: patch review -> resolved status: open -> closed ___ Python tracker

[issue32896] Error when subclassing a dataclass with a field that uses a defaultfactory

Eric V. Smith added the comment: New changeset 22136c94b6e43c8c584a54f3a513b83b753b96ee by Eric V. Smith (Miss Islington (bot)) in branch '3.7': bpo-32896: Fix error when subclassing a dataclass with a field that uses a default_factory (GH-6170) (GH-6171) https://github.com/python/cpython/com

[issue32506] dataclasses: no need for OrderedDict now that dict guarantees to keep insertion order

Change by Eric V. Smith : -- dependencies: -Dict order is now guaranteed, so add tests and doc for it resolution: -> fixed stage: patch review -> resolved status: open -> closed ___ Python tracker __

[issue33113] Query performance is very low and can even lead to denial of service

Change by Xiang Zhang : -- nosy: +serhiy.storchaka ___ Python tracker ___ ___ Python-bugs-list mailing list Unsubscribe: https://mai