[issue45110] argparse repeats itself when formatting help metavars
Lewis Gaul added the comment: Big +1 from me for at least supporting a way to get the more concise output. I've never understood the verbosity of python's argparse where the metavar is repeated. -- nosy: +LewisGaul ___ Python tracker <https://bugs.python.org/issue45110> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43080] pprint for dataclass instances
Lewis Gaul added the comment: > FWIW, we've not had a feature request for this ever, nor has there been a > request for pprint to support attrs, nor any other hand-rolled class that > implements methods similar to those generated by dataclasses. I wouldn't expect core Python to support a 3rd party lib like attrs, but I fail to see what's so different between dataclasses, SimpleNamespace and namedtuple - all of these may be used for storing/modelling [nested] data, which then may be printed. > AFAICT, this tracker issue wasn't motivated by a known use case; rather, it > was "my PR was accepted for SimpleNamespace and thought dataclasses could be > the next." This issue is entirely motivated by a real-world example - I'm currently maintaining a private fork of the pprint module with support for dataclasses added. I'm assuming the reason this hasn't come up before is that dataclasses are relatively new (and plenty of users will still be on older versions of Python). I was not the author of the issue that added support for SimpleNamespace, I just saw it and used it as an example of precedent. > At some point, we need a modern redesign alternative to pprint. I'm on board with this, but as Eric said there aren't currently any signs of this being worked on. In absence of a redesign, dataclass support seems like a natural extension to me. -- ___ Python tracker <https://bugs.python.org/issue43080> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue19073] Inability to specific __qualname__ as a property on a class instance.
Lewis Gaul added the comment: This would also be useful for me - I just hit this same problem. If someone could give some guidance on how to make this change I'd be happy to put up a PR. -- nosy: +LewisGaul ___ Python tracker <https://bugs.python.org/issue19073> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43080] pprint for dataclass instances
Lewis Gaul added the comment: @Serhiy - Yes, I noted that problem in the PR. Thanks for pointing me to that issue, I agree it would be good to make pprint properly extensible (my current solution is to maintain a fork of the pprint module with dataclass support added). Eric's suggestion would work, I wasn't sure if it would be considered an 'ok' thing to do, but if so then could be an easy enough way to support dataclasses (and namedtuples potentially)? -- ___ Python tracker <https://bugs.python.org/issue43080> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43080] pprint for dataclass instances
Lewis Gaul added the comment: > a dataclass can do anything a regular class can do Agreed, but isn't that also true of any subclasses of currently supported types? In particular 'UserDict', 'UserList' and 'UserString', which all have explicit support in pprint and are intended for "easier subclassing" according to the docs. I'm also not sure why it would be a reason for not giving it pprint handling (in the case where there's no user-defined __repr__). Is there any harm in doing so? I'd consider dataclasses one of the primary choices for storing data in modern Python (e.g. for converting to/from JSON/YAML), and may well be used for storing nested data, which can be very hard to read without some mechanism for pretty-printing. Indeed, the dataclasses.asdict() function recurses into dataclass fields. This gives the option of pprint(dataclasses.asdict(my_dataclass)), but at the cost of losing the class names and any custom reprs. -- ___ Python tracker <https://bugs.python.org/issue43080> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43080] pprint for dataclass instances
Change by Lewis Gaul : -- keywords: +patch pull_requests: +23204 stage: -> patch review pull_request: https://github.com/python/cpython/pull/24389 ___ Python tracker <https://bugs.python.org/issue43080> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue43080] pprint for dataclass instances
New submission from Lewis Gaul : Currently the pprint module does not have support for dataclasses. I have implemented support for this and will link the PR once I have the issue number! See also issue37376 for SimpleNamespace support. -- components: Library (Lib) messages: 386002 nosy: LewisGaul, eric.snow, rhettinger, serhiy.storchaka priority: normal severity: normal status: open title: pprint for dataclass instances type: enhancement versions: Python 3.10 ___ Python tracker <https://bugs.python.org/issue43080> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38865] [subinterpreters] Can Py_Finalize() be called if the current interpreter is not the main interpreter?
Change by Lewis Gaul : -- pull_requests: +21889 pull_request: https://github.com/python/cpython/pull/17575 ___ Python tracker <https://bugs.python.org/issue38865> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37776] [subinterpreters] Test Py_Finalize() from a subinterpreter
Change by Lewis Gaul : -- keywords: +patch pull_requests: +21890 stage: needs patch -> patch review pull_request: https://github.com/python/cpython/pull/17575 ___ Python tracker <https://bugs.python.org/issue37776> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38865] [subinterpreters] Can Py_Finalize() be called if the current interpreter is not the main interpreter?
Change by Lewis Gaul : -- pull_requests: -21778 ___ Python tracker <https://bugs.python.org/issue38865> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38865] [subinterpreters] Can Py_Finalize() be called if the current interpreter is not the main interpreter?
Change by Lewis Gaul : -- nosy: +LewisGaul nosy_count: 4.0 -> 5.0 pull_requests: +21778 pull_request: https://github.com/python/cpython/pull/17575 ___ Python tracker <https://bugs.python.org/issue38865> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38379] finalizer resurrection in gc
Lewis Gaul added the comment: You're right that's how I had interpreted it, thanks for clarifying. I was wondering if this could be related to an issue I've hit with gc.collect() getting slower and slower in a test suite, but that now seems unlikely, so I won't go into that here. -- ___ Python tracker <https://bugs.python.org/issue38379> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38379] finalizer resurrection in gc
Lewis Gaul added the comment: I noticed this bug is mentioned in the 3.9 release notes with a note similar to the title of the 4th PR: "garbage collection does not block on resurrected objects". I can't see any mention of a blocking issue here on the issue: > The bug: the stats keep claiming gc is collecting an enormous number of > objects, but in fact it's not collecting any. Objects in the unreachable set > shouldn't add to the "collected" count unless they _are_ collected. Would someone be able to elaborate on the blocking issue that was fixed as part of this BPO? -- nosy: +LewisGaul ___ Python tracker <https://bugs.python.org/issue38379> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37776] Test Py_Finalize() from a subinterpreter
Lewis Gaul added the comment: It seems that test_audit_subinterpreter() in _testembed.c was (unintentionally?) doing this already. After fixing #36225 I found this testcase causes a segfault, but works fine when switching back to the main threadstate before calling Py_Finalize(). So it looks like adding a specific testcase for this is likely to weed out an actual issue here! -- nosy: +LewisGaul ___ Python tracker <https://bugs.python.org/issue37776> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue39030] Ctypes unions with bitfield members that do not share memory
Change by Lewis Gaul : -- nosy: +LewisGaul, belopolsky ___ Python tracker <https://bugs.python.org/issue39030> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue36225] Lingering subinterpreters should be implicitly cleared on shutdown
Change by Lewis Gaul : -- pull_requests: +17048 stage: needs patch -> patch review pull_request: https://github.com/python/cpython/pull/17575 ___ Python tracker <https://bugs.python.org/issue36225> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38860] GenericPyCData_new does not invoke new or init
Change by Lewis Gaul : -- nosy: +LewisGaul, aeros ___ Python tracker <https://bugs.python.org/issue38860> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37292] _xxsubinterpreters: Can't unpickle objects defined in __main__
Lewis Gaul added the comment: The relevant code for the multiprocessing example seems to be in Lib/multiprocessing/spawn.py. I think I get what it's doing, but I'm not sure whether we actually need something similar for subinterpreters. Any thoughts @eric.snow? -- ___ Python tracker <https://bugs.python.org/issue37292> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue37292] _xxsubinterpreters: Can't unpickle objects defined in __main__
Lewis Gaul added the comment:
Just to move the conversation from the subinterpreters project repo to here...
I'm going to take a look at how this is done by subprocess using the example
provided by Guido:
import os
from concurrent.futures import ProcessPoolExecutor
from multiprocessing import get_context
class C:
def __getstate__(self):
print("pickled in %d" % os.getpid())
return {}
def __setstate__(self, state):
print("unpickled in %d" % os.getpid())
def hello(self):
print("Hello world")
if __name__ == "__main__":
with ProcessPoolExecutor(mp_context=get_context("spawn")) as ex:
ex.submit(C().hello).result()
Output:
pickled in 23480
unpickled in 23485
Hello world
--
nosy: +LewisGaul
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[issue36225] Lingering subinterpreters should be implicitly cleared on shutdown
Lewis Gaul added the comment: I've put together a test along the lines of what Nick suggested, see the attached patch. Running this hits the Fatal 'remaining subinterpreters' error as expected: ``` > ./Programs/_testembed test_bpo36225 --- Pass 0 --- interp 0 <0x1A561A0>, thread state <0x1A56DD0>: id(modules) = 139707107673104 interp 1 <0x1A9D050>, thread state <0x1A87620>: id(modules) = 139707106987472 interp 2 <0x1B02210>, thread state <0x1AEC320>: id(modules) = 139706981531088 interp 0 <0x1A561A0>, thread state <0x1A56DD0>: id(modules) = 139707107673104 interp 3 <0x1B53740>, thread state <0x1AFD980>: id(modules) = 139706980408304 interp 4 <0x1BA3390>, thread state <0x1B3C7A0>: id(modules) = 139706979780944 interp 0 <0x1A561A0>, thread state <0x1A56DD0>: id(modules) = 139707107673104 Fatal Python error: PyInterpreterState_Delete: remaining subinterpreters Python runtime state: finalizing (tstate=0x1a56dd0) Aborted ``` I'm happy to look a bit further into the fix for this - Eric's pointers in this thread look useful to get started. @nanjekyejoannah did you get anywhere with this? -- keywords: +patch nosy: +LewisGaul Added file: https://bugs.python.org/file48733/finalise-subinterps-test.diff ___ Python tracker <https://bugs.python.org/issue36225> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38880] Subinterpreters: List interpreters associated with a channel end
Change by Lewis Gaul : -- keywords: +patch pull_requests: +16810 stage: -> patch review pull_request: https://github.com/python/cpython/pull/17323 ___ Python tracker <https://bugs.python.org/issue38880> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38880] Subinterpreters: List interpreters associated with a channel end
New submission from Lewis Gaul : The public interpreters API being implemented for PEP 554 requires the ability to list interpreters associated with channel ends. This functionality needs adding in the internal subinterpreters module. See https://github.com/ericsnowcurrently/multi-core-python/issues/52 and https://www.python.org/dev/peps/pep-0554/#api-for-sharing-data. -- messages: 357181 nosy: Lewis Gaul, eric.snow, nanjekyejoannah priority: normal severity: normal status: open title: Subinterpreters: List interpreters associated with a channel end type: enhancement versions: Python 3.9 ___ Python tracker <https://bugs.python.org/issue38880> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue16142] ArgumentParser inconsistent with parse_known_args
Change by Lewis Gaul : -- nosy: +aeros ___ Python tracker <https://bugs.python.org/issue16142> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue27994] In the argparse help(argparse) prints weird comments instead of good docstrings
Change by Lewis Gaul : -- nosy: +aeros ___ Python tracker <https://bugs.python.org/issue27994> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue27994] In the argparse help(argparse) prints weird comments instead of good docstrings
Lewis Gaul added the comment: This doesn't seem to be the case [anymore] to me, should this be closed? -- nosy: +Lewis Gaul ___ Python tracker <https://bugs.python.org/issue27994> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38475] Break Statement
Lewis Gaul added the comment: Should this issue be closed? -- nosy: +Lewis Gaul ___ Python tracker <https://bugs.python.org/issue38475> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23692] Undocumented feature prevents re module from finding certain matches
Lewis Gaul added the comment: Thanks for the explanation Matthew, I'll take a further look at some point in the coming weeks. -- ___ Python tracker <https://bugs.python.org/issue23692> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue22491] Support Unicode line boundaries in regular expression
Lewis Gaul added the comment: Hi there, I'm running 'EnHackathon' in a couple of weeks, and was wondering if this could be a good issue for a small team of first-time contributors with experience in C to work on. Would anyone be able to offer any guidance for where to start in Modules/_sre.c? -- nosy: +Lewis Gaul ___ Python tracker <https://bugs.python.org/issue22491> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue23692] Undocumented feature prevents re module from finding certain matches
Lewis Gaul added the comment: Hi there, if anyone's able to provide any guidance on this issue I'd be happy to take a look into it. Is this a behaviour that is feasible to fix, or should this just be documented in some way as suggested by Evgeny? -- nosy: +Lewis Gaul ___ Python tracker <https://bugs.python.org/issue23692> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21002] _sre.SRE_Scanner object should have a fullmatch() method
Lewis Gaul added the comment: Scanner is not documented in CPython's own re documentation: https://docs.python.org/3/library/re.html#regular-expression-objects, so I'd say there's no obligation to maintain consistency with public APIs. Is anyone able to make a call on whether this issue should be closed, or alternatively give some guidance on what work this issue should encompass? -- nosy: +Lewis Gaul ___ Python tracker <https://bugs.python.org/issue21002> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue38351] Modernize email example from %-formatting to f-string
Lewis Gaul added the comment: Hi all, I'm a newcomer interested in making this small fix, but it looks like this has become a bit of a contentious issue. Are there any advances on whether this is a desirable fix? -- nosy: +Lewis Gaul ___ Python tracker <https://bugs.python.org/issue38351> ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
