[issue21145] Add the @cached_property decorator

Carl Meyer added the comment: Oops, never mind; closed mine as dupe. -- ___ Python tracker ___

[issue33577] remove wrapping of __set_name__ exceptions in RuntimeError

Carl Meyer added the comment: Oops, duplicate of issue33576. -- resolution: -> duplicate stage: -> resolved status: open -> closed ___ Python tracker

[issue21145] Add the @cached_property decorator

Carl Meyer added the comment: Makes sense to me. Sounds like a separate issue and PR; I filed issue33577 and will work on a patch. -- ___ Python tracker

[issue33577] remove wrapping of __set_name__ exceptions in RuntimeError

New submission from Carl Meyer : Per Nick Coghlan in discussion on issue21145: "I think it would make sense to remove the exception wrapping from the __set_name__ calls - I don't think we're improving the ease of understanding the tracebacks by converting everything to a

[issue21145] Add the @cached_property decorator

Nick Coghlan added the comment: I filed https://bugs.python.org/issue33576 to cover removing the exception wrapping from __set_name__ errors. -- ___ Python tracker

[issue33576] Remove exception wrapping from __set_name__ calls

New submission from Nick Coghlan : Type creation currently wraps all exceptions raised by __set_name__ calls with a generic RuntimeError: https://github.com/python/cpython/blob/master/Objects/typeobject.c#L7263 Unfortunately, this makes it difficult to use __set_name__ for

[issue21145] Add the @cached_property decorator

Nick Coghlan added the comment: I think it would make sense to remove the exception wrapping from the __set_name__ calls - I don't think we're improving the ease of understanding the tracebacks by converting everything to a generic RuntimeError, and we're hurting the UX

[issue21145] Add the @cached_property decorator

Carl Meyer added the comment: Sent a PR with the patch. Nick, I tried your `__set_name__` proposal to get an earlier error in case of an object with slots, but it has the downside that Python seems to always raise a new chained exception if `__set_name__` raises any

[issue21145] Add the @cached_property decorator

Change by Carl Meyer : -- pull_requests: +6636 stage: -> patch review ___ Python tracker ___

[issue19251] bitwise ops for bytes of equal length

Nick Coghlan added the comment: I think Antoine's right that another venue (such as python-ideas) might be a better venue for this discussion, but I'll still try to explain the potential analogy I see to bytes.upper()/.lower()/etc: those operations let you treat ASCII

[issue33528] os.getentropy support

David Carlier added the comment: Those are valid points honestly. OpenBSD's getentropy works that way indeed (getentropy has also been implemented into FreeBSD in the CURRENT branch couple of months ago). So indeed os.urandom provides already a wrapping usage only this

[issue33575] Python relies on C undefined behavior float-cast-overflow

Benjamin Peterson added the comment: You might want to have a look at #20941. Arguably ubsan is too pendantic in some of these cases. -- nosy: +benjamin.peterson ___ Python tracker

[issue33499] Environment variable to set alternate location for pycache tree

Carl Meyer added the comment: Cool, thanks for the pointer on -X. PR is updated with `-X bytecode_path=PATH`; don't think it's critical to have it, but it wasn't that hard to add. -- ___ Python tracker

[issue20941] pytime.c:184 and pytime.c:218: runtime error, outside the range of representable values of type 'long'

Martin Panter added the comment: I don’t know; I haven’t tested it. I was anticipating that it is fixed, but perhaps I should leave the resolution alone instead? -- ___ Python tracker

[issue20941] pytime.c:184 and pytime.c:218: runtime error, outside the range of representable values of type 'long'

STINNER Victor added the comment: "resolution: out of date" Is this issue fixed or not? It's still open. -- ___ Python tracker

[issue20941] pytime.c:184 and pytime.c:218: runtime error, outside the range of representable values of type 'long'

Martin Panter added the comment: Maybe worth checking if this is fixed due to the changes in Issue 31373 for 3.6+. -- nosy: +martin.panter resolution: -> out of date superseder: -> demoting floating float values to unrepresentable types is undefined behavior

[issue33321] Add a Linux clang ubsan undefined behavior sanitizer buildbot

Martin Panter added the comment: Perhaps your “ctypes” problems may be helped by my ctypes_v2.patch in Issue 1621. Or perhaps they are already documented in Issue 15119 and/or Issue 28169. -- nosy: +martin.panter ___ Python

[issue1621] Do not assume signed integer overflow behavior

Martin Panter added the comment: Sorry I haven’t made a PR for ctypes_v2.patch, but I don’t mind if someone else takes over. I understand the HAVE_LONG_LONG check may no longer necessary for newer Python versions. -- ___

[issue19950] Document that unittest.TestCase.__init__ is called once per test

Change by Gregory P. Smith : -- resolution: -> fixed stage: patch review -> commit review status: open -> closed ___ Python tracker

[issue19950] Document that unittest.TestCase.__init__ is called once per test

Gregory P. Smith added the comment: New changeset 436972e295f5057fe7cdd7312f543c2fa884705d by Gregory P. Smith (Miss Islington (bot)) in branch '3.7': bpo-19950: Clarify unittest TestCase instance use. (GH-6875) (GH-6938)

[issue19950] Document that unittest.TestCase.__init__ is called once per test

Gregory P. Smith added the comment: New changeset a5f33a899f6450de96f5e4cd154de4486d50bdd7 by Gregory P. Smith (Miss Islington (bot)) in branch '3.6': bpo-19950: Clarify unittest TestCase instance use. (GH-6875) (GH-6939)

[issue20104] expose posix_spawn(p)

STINNER Victor added the comment: > I originally removed it from the configure script in PR6794 but it was > reintroduced in commit 57009526f6a405e0ffe8c16012cce509b62cb577. Check the PR > for Greg's rationale. Oh ok. -- ___

[issue33565] strange tracemalloc results

STINNER Victor added the comment: tracemalloc doesn't track memory leaks. It tracks memory allocations. I'm not sure that you are using tracemalloc properly. I suggest you to enable tracemalloc as soon as possible, take snapshot frequently (eg. at each iteration) and

[issue33565] strange tracemalloc results

STINNER Victor added the comment: Once you found and fixed your memory leak, any documentation enhancement is welcome :-) -- ___ Python tracker

[issue33531] test_asyncio: test_subprocess test_stdin_broken_pipe() failure on Travis CI

STINNER Victor added the comment: Terry: " The Travis retest (for 3.7 backport) just failed with the same errors. Why can't we disable this tests. It now takes hours to do a merge with two backports." Usually, I prefer to try to understand a bug before disabling, even

[issue33341] python3 fails to build if directory or sysroot contains "*icc*" string

Change by STINNER Victor : -- nosy: +vstinner ___ Python tracker ___ ___

[issue28584] ICC compiler check is too permissive

Change by STINNER Victor : -- nosy: +vstinner ___ Python tracker ___ ___

[issue33341] python3 fails to build if directory or sysroot contains "*icc*" string

Change by STINNER Victor : -- nosy: -vstinner ___ Python tracker ___ ___

[issue26819] _ProactorReadPipeTransport pause_reading()/resume_reading() broken if called before any read is perfored

Change by STINNER Victor : -- nosy: -vstinner ___ Python tracker ___ ___

[issue33501] split existing optimization levels into granular options

STINNER Victor added the comment: I'm not sure that the bug tracker is the best place to propose such idea. Maybe start a new thread on python-ideas? -- ___ Python tracker

[issue21145] Add the @cached_property decorator

Change by STINNER Victor : -- nosy: -vstinner ___ Python tracker ___ ___

[issue33528] os.getentropy support

STINNER Victor added the comment: I know two main use cases for random numbers: * security: use os.urandom(), secrets and random.SystemRandom * not security: use the random module Exposing os.getentropy() seems like a new non-portable function for the first use case,

[issue33470] Changes from GH-1638 (GH-3575, bpo-28411) are not documented in Porting to Python 3.7

STINNER Victor added the comment: > Sorry for mixing two things here, but I meant that I found out about this > because of the private API use in gdb, however nothing from the change is > documented on whatsnew at all. It seems like there is at least one change in the

[issue29640] _PyThreadState_Init and fork race leads to inconsistent key list

STINNER Victor added the comment: Oh, it seems like I was wrong in my previous comment. Python 2.7 code base is already designed to support native TLS. It's just that we only implement native TLS on Windows. So yeah, it seems doable to implement native TLS for pthread.

[issue20104] expose posix_spawn(p)

Pablo Galindo Salgado added the comment: I originally removed it from the configure script in PR6794 but it was reintroduced in commit 57009526f6a405e0ffe8c16012cce509b62cb577. Check the PR for Greg's rationale. -- ___ Python

[issue32534] Speed-up list.insert: use memmove()

STINNER Victor added the comment: This issue is a micro-optimization which is only 1.08x faster: https://bugs.python.org/issue32534#msg310146 Moreover, it seems really hard to measure precisely the benefit on benchmarks. Results seem to not be reliable. I suggest to

[issue33575] Python relies on C undefined behavior float-cast-overflow

New submission from Gregory P. Smith : Clang's undefined behavior sanitizer is flagging several places in CPython where it is relying on float-cast-overflow behavior. Typically exposed where an out of bounds floating point value is cast to another type. The clang compiler is

[issue16055] incorrect error text for int(base=1000, x='1')

STINNER Victor added the comment: I backported manually the fix to Python 2.7 for int and long types. Thank you Chris Jerdonek for the bug report, and Sanyam Khurana for the bugfix! -- resolution: -> fixed stage: patch review -> resolved status: open -> closed

[issue16055] incorrect error text for int(base=1000, x='1')

STINNER Victor added the comment: New changeset d13169fc5ac7572a272cbcff830c3d96ba27cc7c by Victor Stinner in branch '2.7': bpo-16055: Fixes incorrect error text for int('1', base=1000) (#6980)

[issue20104] expose posix_spawn(p)

STINNER Victor added the comment: posix_spawn can still be found in Python 3.7: configure:11243: posix_fallocate posix_fadvise posix_spawn pread preadv preadv2 \ configure.ac:3470: posix_fallocate posix_fadvise posix_spawn pread preadv preadv2 \ pyconfig.h.in:710:/*

[issue33358] [EASY] x86 Ubuntu Shared 3.x: test_embed.test_pre_initialization_sys_options() fails

STINNER Victor added the comment: Thank you for the fix Pablo! -- ___ Python tracker ___

[issue33518] Add PEP to glossary

STINNER Victor added the comment: New changeset fb5d0aa116125dfb29a3c4d8819a38dfb2760bb9 by Victor Stinner (Andrés Delfino) in branch '3.6': [3.6] bpo-33518: Add PEP entry to documentation glossary (GH-6860) (#6935)

[issue33518] Add PEP to glossary

STINNER Victor added the comment: New changeset a3a554a536599189166843cd80e62d02b2b68aa8 by Victor Stinner (Andrés Delfino) in branch '3.7': [3.7] bpo-33518: Add PEP entry to documentation glossary (GH-6860) (#6934)

[issue30273] The coverage job is broken: distutils build_ext fails on None

STINNER Victor added the comment: https://github.com/python/cpython/pull/1515 has the "needs backport to 2.7" label, but I'm unable to reproduce the bug on Python 2.7: * Python 2.7 has no "venv" module * When I compile Python out of tree, and then use "virtualenv -p

[issue16055] incorrect error text for int(base=1000, x='1')

Change by STINNER Victor : -- pull_requests: +6635 ___ Python tracker ___ ___

[issue28556] typing.py upgrades

Ivan Levkivskyi added the comment: New changeset 09ca5906b7d1619b7efed0bebb6f3c424fe3d83b by Ivan Levkivskyi (Miss Islington (bot)) in branch '3.7': bpo-28556: Don't simplify unions at runtime (GH-6841) (GH-6979)

[issue33521] Add 1.32x faster C implementation of asyncio.isfuture().

STINNER Victor added the comment: About the benchmark: you should not loop inside the function. I propose a variant of the benchmark: isfuture_benchmark2.py. Jimmy: Would you mind to run this variant on your PR? -- Added file:

[issue28556] typing.py upgrades

Change by miss-islington : -- pull_requests: +6634 ___ Python tracker ___

[issue28556] typing.py upgrades

Ivan Levkivskyi added the comment: New changeset f65e31fee3b55dfb6ed5398179d5c5d6b502dee5 by Ivan Levkivskyi in branch 'master': bpo-28556: Don't simplify unions at runtime (GH-6841) https://github.com/python/cpython/commit/f65e31fee3b55dfb6ed5398179d5c5d6b502dee5

[issue32996] Improve What's New in 3.7

Change by Elvis Pranskevichus : -- pull_requests: +6633 ___ Python tracker ___ ___

[issue33547] Relative imports do not replace local variables

R. David Murray added the comment: Yes, you are substantially correct. A subtlety that may enhance your understanding (if it doesn't instead totally confuse you :) is that __init__ is simply the most straightforward way to affect the module namespace. You would see

[issue33547] Relative imports do not replace local variables

Rolf Campbell added the comment: OK, OK, I think I finally understand what you mean here. Let me try to repeat it just to make sure I really understand: When requesting a member of a multi-file module (like "func" in my example), python only tries to load that

[issue33447] Asynchronous lambda syntax

Terry J. Reedy added the comment: The only thing special about functions defined with lambda expressions rather than def statements is the generic name attribute '' instead of a specific name. PEP8 intentionally and properly discourages 'name = lambda ...' as inferior to

[issue33547] Relative imports do not replace local variables

R. David Murray added the comment: It's the same answer. __init__ *is* the package namespace, so you are setting the value of 'func' in the package (.) namespace, and what import is doing is correct. I know this is confusing. I banged my head against it while

[issue33540] socketserver: Add an opt-in option to get Python 3.6 behaviour on server_close()

Ned Deily added the comment: It would be great if someone(s) could give PR 6911 a review, since it is a release blocker for 3.7.0rc1. Thanks! -- ___ Python tracker

[issue22848] Subparser help does not respect SUPPRESS argument

Change by Andrew Gaul : -- nosy: +gaul ___ Python tracker ___ ___ Python-bugs-list mailing

[issue30437] SSL_shutdown needs SSL_read() until SSL_ERROR_ZERO_RETURN

Change by Christian Heimes : -- keywords: +patch pull_requests: +6632 stage: -> patch review ___ Python tracker ___

[issue33522] Enable CI builds on Visual Studio Team Services

Steve Dower added the comment: GitHub has broken CSS everywhere right now :) Their oauth page doesn't show scroll bars either, which means you can't get to the "authorise" button if you're in more than a couple of organisations. --

[issue33574] Conversion of Number to String(str(number))

Eric V. Smith added the comment: The way to avoid this problem is to not assign to str. You should not shadow python builtins that you want to continue using. -- nosy: +eric.smith resolution: -> not a bug stage: -> resolved status: open -> closed type: compile

[issue33447] Asynchronous lambda syntax

Yury Selivanov added the comment: The syntax for async lambdas doesn't look nice and I, personally, don't see that many use cases for them to justify adding new syntax. And this would need a new PEP. I suggest to start a discussion on the Python-ideas mailing list if

[issue33570] OpenSSL 1.1.1 / TLS 1.3 cipher suite changes

Change by Christian Heimes : -- keywords: +patch pull_requests: +6631 stage: test needed -> patch review ___ Python tracker ___

[issue33556] leftover thread crumb in threading.ident docstring

Zachary Ware added the comment: Done, thanks Skip :) Can we convince you to reclaim your commit bits so you can click the buttons yourself next time? ;) -- resolution: -> fixed stage: patch review -> resolved status: open -> closed

[issue33556] leftover thread crumb in threading.ident docstring

Zachary Ware added the comment: New changeset abde17e663edd6437cc7eb0405fe418449a25d72 by Zachary Ware (Miss Islington (bot)) in branch '3.7': bpo-33556: Remove reference to thread module from docstring (GH-6963)

[issue33572] Better document mixed-type comparison of set items, dict keys

Terry J. Reedy added the comment: With Tim's addition >>> from fractions import Fraction as F >>> from decimal import Decimal as D >>> s = {0, 1, 0.0, 1.0, F(0,1), F(1, 1), D(0), D(1), False, True} >>> s {0, 1} I think we should consider moving the main discussion of the

[issue33565] strange tracemalloc results

Alexander Mohr added the comment: here's a version that tries to do something similar but does not reproduce the issue -- Added file: https://bugs.python.org/file47602/tracemalloc_test2.py ___ Python tracker

[issue33556] leftover thread crumb in threading.ident docstring

miss-islington added the comment: New changeset c6a5cc8f244ee71ce932003366411aacadda8dd0 by Miss Islington (bot) in branch '3.6': bpo-33556: Remove reference to thread module from docstring (GH-6963)

[issue33547] Relative imports do not replace local variables

Change by Rolf Campbell : -- resolution: not a bug -> ___ Python tracker ___

[issue33574] Conversion of Number to String(str(number))

New submission from Khalid Moh'd. : Consider conversion of an integer to string: a=5 #number str #outputs str(a) #works perfectly and prints '5' Now, consider: str="Hello World" #reads the string str #prints "Hello World" str(5) #gives an error Interpreter considers

[issue33547] Relative imports do not replace local variables

Rolf Campbell added the comment: Re-opening because I've found a simple example that does not involve __main__. ./func/__init__.py:func = 1 ./func/__init__.py:from . import func ./func/__init__.py:print(f"Namespace value of func after func module import:{func}")

[issue33573] statistics.median does not work with ordinal scale

New submission from W deW : The 0.5-quantile or median is defined for ordinal, interval, and ratio scales. An Enumerator as derived from Enum and extended with rich comparison methods implements an ordinal scale. Therefore calculating the median over a list of such

[issue33572] False/True as dictionary keys treated as integers

Change by Terry J. Reedy : -- assignee: -> docs@python components: +Documentation -Interpreter Core nosy: +docs@python ___ Python tracker

[issue33556] leftover thread crumb in threading.ident docstring

Change by miss-islington : -- pull_requests: +6630 ___ Python tracker ___

[issue33556] leftover thread crumb in threading.ident docstring

Change by miss-islington : -- pull_requests: +6629 ___ Python tracker ___

[issue33556] leftover thread crumb in threading.ident docstring

Zachary Ware added the comment: New changeset 5634331a76dfe9fbe4b76475e11307a0922d6a15 by Zachary Ware (Skip Montanaro) in branch 'master': bpo-33556: Remove reference to thread module from docstring (GH-6963)

[issue33572] False/True as dictionary keys treated as integers

Tim Peters added the comment: I expect these docs date back to when ints, longs, and floats were the only hashable language-supplied types for which mixed-type comparison could ever return True. They could stand some updates ;-) `fractions.Fraction` and `decimal.Decimal`

[issue33572] False/True as dictionary keys treated as integers

Terry J. Reedy added the comment: Mark, are you suggesting a doc addition (and a change of Components) or should we close this as 'not a bug'? -- nosy: +terry.reedy ___ Python tracker

[issue33527] Invalid child function scope

Change by Terry J. Reedy : -- stage: -> test needed versions: -Python 3.4, Python 3.5 ___ Python tracker ___

[issue33516] unittest.mock: Add __round__ to supported magicmock methods

Change by Terry J. Reedy : -- nosy: +michael.foord versions: +Python 3.8 ___ Python tracker ___

[issue33500] Python TKinter for Mac on latest 2.7.15 still extremely slow vs Windows

Terry J. Reedy added the comment: Responses to the following might help anyone who works on this. 1. Is the relative performance only an issue on 2.7 and not 3.6+? 2. What are the 'recent issues here'? What is different about your example code. 3. We prefer plain text .py

[issue33566] re.findall() dead locked whent the expected ending char not occur until end of string

Tim Peters added the comment: Min, you need to give a complete example other people can actually run for themselves. Offhand, this part of the regexp (.|\s)* all by itself _can_ cause exponential-time behavior. You can run this for yourself: >>> import re >>> p =

[issue33566] re.findall() dead locked whent the expected ending char not occur until end of string

Matthew Barnett added the comment: You don't give the value of 'newlines', but the problem is probably catastrophic backtracking, not deadlock. -- nosy: +mrabarnett ___ Python tracker

[issue33477] Document that compile(code, 'exec') has different behavior in 3.7+

Change by Matthias Bussonnier : -- keywords: +patch pull_requests: +6628 stage: -> patch review ___ Python tracker ___

[issue32282] When using a Windows XP compatible toolset, `socketmodule.c` fails to build

Berker Peksag added the comment: It looks like we need to backport this manually for 3.5 (if Larry approves) -- stage: patch review -> backport needed versions: -Python 3.6, Python 3.7 ___ Python tracker

[issue32282] When using a Windows XP compatible toolset, `socketmodule.c` fails to build

Berker Peksag added the comment: New changeset 09eb6fe8fdd2515546b933902aef36b72d417ace by Berker Peksag (Miss Islington (bot)) in branch '3.6': bpo-32282: Remove unnecessary check for `VersionHelpers.h` in `socketmodule.c` on Windows (GH-5120)

[issue19251] bitwise ops for bytes of equal length

Antoine Pitrou added the comment: Please, let's have this API discussion outside of the bug tracker. This deserves a PEP. Also because I have an alternative API to suggest :-) -- ___ Python tracker

[issue33492] Updating the Evaluation order section to cover *expression in calls

Change by Terry J. Reedy : -- versions: -Python 3.5 ___ Python tracker ___ ___

[issue33471] string format with 'n' failling with french locales

Change by Terry J. Reedy : -- versions: +Python 3.7, Python 3.8 ___ Python tracker ___ ___

[issue19251] bitwise ops for bytes of equal length

Stefan Behnel added the comment: I'd second the proposal of considering the "array.array" type for this, instead of the bytes/bytearray types. Why? Because it is somewhat of a niche case after all, and the bytes type seems too exposed for it. Also, array.array supports

[issue33477] Document that compile(code, 'exec') has different behavior in 3.7+

Matthias Bussonnier added the comment: Fair enough that what's new include things about Module > The first statement in their body is not considered as a docstring anymore. Note that this sentence read backward to me. I understand what is meant because I know

[issue33477] Document that compile(code, 'exec') has different behavior in 3.7+

INADA Naoki added the comment: Any comments? Would you close this issue? -- ___ Python tracker ___

[issue33572] False/True as dictionary keys treated as integers

Mark Dickinson added the comment: It's documented here: https://docs.python.org/3/library/stdtypes.html#mapping-types-dict > Numeric types used for keys obey the normal rules for numeric > comparison: if two numbers compare equal (such as 1 and 1.0) then > they can be

[issue33522] Enable CI builds on Visual Studio Team Services

Change by Gregory P. Smith : -- resolution: -> fixed stage: -> resolved status: open -> closed ___ Python tracker ___

[issue33522] Enable CI builds on Visual Studio Team Services

Gregory P. Smith added the comment: I've emailed support@github on this one. Their UI is horrible, "show all checks" does not show them all. It shows five at most. It is an invisible scrolling region. We're forced to manually mouse over and scroll down in that region in

[issue33572] False/True as dictionary keys treated as integers

Janusz Harkot added the comment: Python 3.6.5 (default, Mar 29 2018, 03:28:50) [GCC 5.4.0 20160609] on linux Type "help", "copyright", "credits" or "license" for more information. >>> dta = {False: 'false', True: 'true', 0: 'zero', 1: 'one'} >>> print(dta[False]) zero

[issue33572] False/True as dictionary keys treated as integers

New submission from Janusz Harkot : using boolean (True/False) as dictionary keys, coerce them to integers - is this behavior documented somewhere? I know that asking to fix this is not easy fix, but shouldn't this be highlighted everywhere with red flags and

[issue33257] Race conditions in Tkinter with non-threaded Tcl

Change by Ivan Pozdeev : -- pull_requests: +6627 ___ Python tracker ___ ___

[issue33507] Improving the html rendered by cgitb.html

Stéphane Blondon added the comment: > Instead of hardcoding colors, would it be better to use CSS instead. I agree with you. The current source code contains hardcoded colors. I could add an optional parameter to change the css for the cgitb.html() function: def

[issue33522] Enable CI builds on Visual Studio Team Services

Steve Dower added the comment: > I don't think there's a way to make certain checks like VSTS be optional and > not show up with a red cross on Github Most of the failures I've seen have been reproducible, so I suspect they're due to race conditions that rarely

[issue33522] Enable CI builds on Visual Studio Team Services

Steve Dower added the comment: > * is there more computers for the tests on VSTS? I don't know what Travis is giving us, but Microsoft has provided 20 concurrent builds. They also seem to be more powerful machines, though some caching features are missing and many

[issue33571] Add triple quotes to list of delimiters that trigger '...' prompt

Change by Andrés Delfino : -- keywords: +patch pull_requests: +6626 stage: -> patch review ___ Python tracker ___

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