[issue41818] Lib/pty.py major revision

[Soumendra Ganguly]

Change by Soumendra Ganguly :


--
keywords: +patch
pull_requests: +21878
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22962

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[issue26228] pty.spawn hangs on FreeBSD 9.3, 10.x, 12.1

[Soumendra Ganguly]

Change by Soumendra Ganguly :


--
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pull_request: https://github.com/python/cpython/pull/22962

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[issue35823] Use vfork() in subprocess on Linux

[Gregory P. Smith]

Gregory P. Smith  added the comment:

Performance improvement measured on a 1.4Ghz quad aarch64 A57 (nvidia jetson 
nano):

#define VFORK_USABLE 1
 test_subprocess: 36.5 seconds

#undef VFORK_USABLE
 test_subprocess: 45 seconds

Nice.  I really didn't expect a 20% speedup on its testsuite alone!

Lets dive into that with a microbenchmark:

$ ./build-novfork/python ten_seconds_of_truth.py
Launching /bin/true for 10 seconds in a loop.
Launched 2713 subprocesses in 10.00194378796732 seconds.
271.247275281014 subprocesses/second.
Increased our mapped pages by 778240KiB.
Launching /bin/true for 10 seconds in a loop.
Launched 212 subprocesses in 10.006392606999725 seconds.
21.186456331095847 subprocesses/second.

$ ./build/python ten_seconds_of_truth.py
Launching /bin/true for 10 seconds in a loop.
Launched 3310 subprocesses in 10.001623224001378 seconds.
330.94628000551285 subprocesses/second.
Increased our mapped pages by 778240KiB.
Launching /bin/true for 10 seconds in a loop.
Launched 3312 subprocesses in 10.001519071985967 seconds.
331.1496959773679 subprocesses/second.

Demonstrating perfectly the benefit of vfork().  The more mapped pages, the 
slower regular fork() becomes.  With vfork() the size of the process's memory 
map does not matter.

ten_seconds_of_truth.py:

```python
from time import monotonic as now
import subprocess

def benchmark_for_ten():
print('Launching /bin/true for 10 seconds in a loop.')

count = 0
start = now()
while now() - start < 10.:
subprocess.run(['/bin/true'])
count += 1
end = now()
duration = end-start

print(f'Launched {count} subprocesses in {duration} seconds.')
print(f'{count/duration} subprocesses/second.')

benchmark_for_ten()

map_a_bunch_of_pages = '4agkahglahaa^#\0ag3\3'*1024*1024*40

print(f'Increased our mapped pages by {len(map_a_bunch_of_pages)//1024}KiB.')

benchmark_for_ten()
```

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[issue38233] datetime.datetime.fromtimestamp have different behaviour on windows and mac

[Ronald Oussoren]

Ronald Oussoren  added the comment:

Can this issue be closed? Fixing #36439 would also fix this issue.

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[issue41214] -O0: Segmentation fault in _PyArg_UnpackStack

[LE GARREC Vincent]

LE GARREC Vincent  added the comment:

I still have the problem with python 3.7.9 but not with python 3.8.6.

Since I migrated my system to python 3.8, it's not a problem anymore. I still 
have python 3.7 installed so if you want, I still can do some tests.

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[issue41607] pdb - Clickable path to breakpoints

[Artur Tamborski]

Change by Artur Tamborski :


--
keywords: +patch
nosy: +arturtamborski
nosy_count: 2.0 -> 3.0
pull_requests: +21881
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22964

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[issue42120] Depreciated MACRO of copysign for MSVC

[Ronald Oussoren]

Ronald Oussoren  added the comment:

The standard is for copysign to work on doubles, with copysignf as the same 
functionality for floats.


https://en.cppreference.com/w/c/numeric/math/copysign

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[issue41919] Modify test_codecs to use the new codecs.unregister() function

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

AS this is masking other issues in the build bots, we need to revert the commit 
unless is fixed in 24 hours per the buildbot workflow

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[issue41919] Modify test_codecs to use the new codecs.unregister() function

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Commit c9f696cb96d1c362d5cad871f61da520572d9b08 introduced a reference leak in 
the test suite. See https://bugs.python.org/issue42145:

c9f696cb96d1c362d5cad871f61da520572d9b08 is the first bad commit
commit c9f696cb96d1c362d5cad871f61da520572d9b08
Author: Hai Shi 
Date:   Fri Oct 16 16:34:15 2020 +0800

bpo-41919, test_codecs: Move codecs.register calls to setUp() (GH-22513)

Reverting the commit eliminates the problem:

rences, sum=12
test_io leaked [1, 1, 1, 1] memory blocks, sum=4
test_io failed

== Tests result: FAILURE ==

1 test failed:
test_io

Total duration: 397 ms
Tests result: FAILURE
g
~/github/python/master master|bisect*
❯ git revert c9f696cb96d1c362d5cad871f61da520572d9b08
Auto-merging Lib/test/test_codecs.py
[master f3de7c00b4] Revert "bpo-41919, test_codecs: Move codecs.register calls 
to setUp() (GH-22513)"
 7 files changed, 112 insertions(+), 16 deletions(-)

~/github/python/master master|bisect* ⇡
❯ make -j -s
 CC='gcc -pthread' LDSHARED='gcc -pthread -shared' OPT='-g -Og -Wall'   
_TCLTK_INCLUDES='' _TCLTK_LIBS=''   ./python -E ./setup.py -q build

The following modules found by detect_modules() in setup.py, have been
built by the Makefile instead, as configured by the Setup files:
_abc  atexitpwd
time


~/github/python/master master|bisect* ⇡
❯ ./python -m test test_io -m 
test.test_io.CTextIOWrapperTest.test_read_one_by_one -R :
0:00:00 load avg: 2.57 Run tests sequentially
0:00:00 load avg: 2.57 [1/1] test_io
beginning 9 repetitions
123456789
.

== Tests result: SUCCESS ==

1 test OK.

Total duration: 455 ms
Tests result: SUCCESS

* Move the codecs' (un)register operation to testcases.
* Remove _codecs._forget_codec() and _PyCodec_Forget()

 Lib/test/test_charmapcodec.py|  7 +--
 Lib/test/test_codecs.py  | 25 +++--
 Lib/test/test_io.py  |  7 +++
 Lib/test/test_unicode.py |  5 -
 Modules/_codecsmodule.c  | 20 
 Modules/clinic/_codecsmodule.c.h | 39 +--
 Python/codecs.c  | 25 -
 7 files changed, 16 insertions(+), 112 deletions(-)

--
nosy: +pablogsal

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[issue42145] test_io is leaking references

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Commit c9f696cb96d1c362d5cad871f61da520572d9b08 introduced a reference leak in 
the test suite. See https://bugs.python.org/issue42145:

c9f696cb96d1c362d5cad871f61da520572d9b08 is the first bad commit
commit c9f696cb96d1c362d5cad871f61da520572d9b08
Author: Hai Shi 
Date:   Fri Oct 16 16:34:15 2020 +0800

bpo-41919, test_codecs: Move codecs.register calls to setUp() (GH-22513)

Reverting the commit eliminates the problem:

rences, sum=12
test_io leaked [1, 1, 1, 1] memory blocks, sum=4
test_io failed

== Tests result: FAILURE ==

1 test failed:
test_io

Total duration: 397 ms
Tests result: FAILURE
g
~/github/python/master master|bisect*
❯ git revert c9f696cb96d1c362d5cad871f61da520572d9b08
Auto-merging Lib/test/test_codecs.py
[master f3de7c00b4] Revert "bpo-41919, test_codecs: Move codecs.register calls 
to setUp() (GH-22513)"
 7 files changed, 112 insertions(+), 16 deletions(-)

~/github/python/master master|bisect* ⇡
❯ make -j -s
 CC='gcc -pthread' LDSHARED='gcc -pthread -shared' OPT='-g -Og -Wall'   
_TCLTK_INCLUDES='' _TCLTK_LIBS=''   ./python -E ./setup.py -q build

The following modules found by detect_modules() in setup.py, have been
built by the Makefile instead, as configured by the Setup files:
_abc  atexitpwd
time


~/github/python/master master|bisect* ⇡
❯ ./python -m test test_io -m 
test.test_io.CTextIOWrapperTest.test_read_one_by_one -R :
0:00:00 load avg: 2.57 Run tests sequentially
0:00:00 load avg: 2.57 [1/1] test_io
beginning 9 repetitions
123456789
.

== Tests result: SUCCESS ==

1 test OK.

Total duration: 455 ms
Tests result: SUCCESS

* Move the codecs' (un)register operation to testcases.
* Remove _codecs._forget_codec() and _PyCodec_Forget()

 Lib/test/test_charmapcodec.py|  7 +--
 Lib/test/test_codecs.py  | 25 +++--
 Lib/test/test_io.py  |  7 +++
 Lib/test/test_unicode.py |  5 -
 Modules/_codecsmodule.c  | 20 
 Modules/clinic/_codecsmodule.c.h | 39 +--
 Python/codecs.c  | 25 -
 7 files changed, 16 insertions(+), 112 deletions(-)

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[issue41919] Modify test_codecs to use the new codecs.unregister() function

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


--
resolution: fixed -> 
status: closed -> open

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[issue41919] Modify test_codecs to use the new codecs.unregister() function

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


--
pull_requests: +21877
stage: resolved -> patch review
pull_request: https://github.com/python/cpython/pull/22961

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[issue41052] Opt out serialization/deserialization for heap type

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
pull_requests: +21880
pull_request: https://github.com/python/cpython/pull/22963

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[issue34597] Python needs to check existence of functions at runtime for targeting older macOS platforms

[Ronald Oussoren]

Ronald Oussoren  added the comment:

The active PR in bpo-41100 will fix this issue as well.

--
dependencies: +Build failure on macOS 11 (beta)

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[issue42147] Micro optimization for longrange iteration if step is 1

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Sorry, but I do not think it is worth. If there are any issues with multiplying 
by 1, it may be worth to optimize multiplication of integers in general. But 
iterating range(1 << 1000, (1 << 1000) + 100) looks a pretty artificial example.

--
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[issue42148] floating point representation issues

[Andrea Tuccia]

New submission from Andrea Tuccia :

I'm noticing some floating point representation precision issues that occurs on 
all versions and platforms:

>>> 277*0.1
27.703
>>> 1.2-1.0
0.19996
>>> import numpy as np
>>> np.double(277*0.1)
27.703
>>> np.double(1.2-1.0)
0.19996
>>> np.longdouble(277*0.1)
27.702842
>>> np.longdouble(1.2-1.0)
0.19995559

Verified with python 2.7 to 3.8. On x86 (i386 and amd64) and ARM (32 and 64 
bits). It does not occur in C, LUA, Perl, ...

--
components: Interpreter Core, Library (Lib)
messages: 379589
nosy: atuccia
priority: normal
severity: normal
status: open
title: floating point representation issues
type: behavior

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[issue42145] test_io is leaking references

[Dong-hee Na]

Change by Dong-hee Na :


--
nosy: +shihai1991

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[issue42146] subprocess.Popen() leaks cwd in case of uid/gid overflow

[Alexey Izbyshev]

Change by Alexey Izbyshev :


--
keywords: +patch
pull_requests: +21882
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22966

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[issue42144] A missing "goto" in the _ssl module!

[miss-islington]

miss-islington  added the comment:


New changeset c32f2976b8f4034724c3270397aa16f38daf470f by Zackery Spytz in 
branch 'master':
bpo-42144: Add a missing "goto error;" in the _ssl module (GH-22959)
https://github.com/python/cpython/commit/c32f2976b8f4034724c3270397aa16f38daf470f


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[issue42144] A missing "goto" in the _ssl module!

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/22975

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[issue42144] A missing "goto" in the _ssl module!

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/22974

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[issue42141] Speedup various dict inits

[Marco Sulla]

Marco Sulla  added the comment:

Note that this time I've no slowdown in the macro bench, since I used normal 
builds, not optimized ones. I suppose an optimized build will show slowdown 
because the new functions are not in the test battery.

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[issue4489] shutil.rmtree is vulnerable to a symlink attack

[daniel hahler]

Change by daniel hahler :


--
nosy: +blueyed
nosy_count: 18.0 -> 19.0
pull_requests: +21884
pull_request: https://github.com/python/cpython/pull/22968

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[issue39108] random needs doc for "gauss" versus "normalvariate"

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset 3cde3788b68bce7deee1e6d31e265bbfce337731 by Raymond Hettinger in 
branch 'master':
bpo-39108: Document threading issues for random.gauss() (GH-22928)
https://github.com/python/cpython/commit/3cde3788b68bce7deee1e6d31e265bbfce337731


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[issue42147] Micro optimization for longrange iteration if step is 1

[Dong-hee Na]

Dong-hee Na  added the comment:

if somebody try to sum very large value with range.
sum(range(1 << 1000, (1 << 1000) + 100))
it can be affected by this patch.

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[issue42090] zipfile.Path.joinpath API inconsistent with pathlib.Path.joinpath

[Jason R. Coombs]

Jason R. Coombs  added the comment:

This issue is fixed in zipp 3.4.0.

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stage:  -> backport needed

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[issue41919] Modify test_codecs to use the new codecs.unregister() function

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue41919] Modify test_codecs to use the new codecs.unregister() function

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 14cdc215aa952d280c18626005d3aff967901d92 by Hai Shi in branch 
'master':
bpo-41919: Avoid resource leak in test_io (GH-22973)
https://github.com/python/cpython/commit/14cdc215aa952d280c18626005d3aff967901d92


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[issue42145] test_io is leaking references

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Fixed by https://github.com/python/cpython/pull/22973

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stage:  -> resolved
status: open -> closed

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[issue42145] test_io is leaking references

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Thanks for the quick fix, hai shi

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[issue42141] Speedup various dict inits

[Marco Sulla]

Marco Sulla  added the comment:

I'm quite sure I not invented the wheel :) but I think it's a good improvement:

| pathlib | 35.8 ms  | 35.1 ms| 1.02x 
faster | Significant (t=13.21) |
| scimark_monte_carlo | 176 ms   | 172 ms | 1.02x 
faster | Significant (t=9.48)  |
| scimark_sor | 332 ms   | 325 ms | 1.02x 
faster | Significant (t=11.96) |
| telco   | 11.0 ms  | 10.8 ms| 1.03x 
faster | Significant (t=8.52)  |
| unpickle_pure_python| 525 us   | 514 us | 1.02x 
faster | Significant (t=19.97) |
| xml_etree_process   | 132 ms   | 129 ms | 1.02x 
faster | Significant (t=17.59) |

--
components: +Interpreter Core
type:  -> performance
versions: +Python 3.10

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[issue38233] datetime.datetime.fromtimestamp have different behaviour on windows and mac

[Eryk Sun]

Change by Eryk Sun :


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status: open -> closed

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[issue39108] random needs doc for "gauss" versus "normalvariate"

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset af891a962b62268d76ace0d4768ab0e1934a2cd1 by Miss Skeleton (bot) 
in branch '3.9':
bpo-39108: Document threading issues for random.gauss() (GH-22928) (GH-22972)
https://github.com/python/cpython/commit/af891a962b62268d76ace0d4768ab0e1934a2cd1


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[issue33962] IDLE: use ttk.spinbox with configdialog

[Mark Roseman]

Mark Roseman  added the comment:

Whoops, sorry... there's a "readonly" state flag that disables direct editing 
of the entry (like with combobox) and just allows manipulation of the arrows. 
I've updated the PR to set that. I've also changed it so that the contents of 
the entry part isn't selected whenever the arrows are used (agreed, it looks 
ugly). Please give it a try and let me know.

p.s. I just checked, the entry's width configuration option works. You just 
have to remove the "fill=X" when the widget is packed. FWIW, I kept the 
previous layout to keep the patch as minimal as possible, under the assumption 
that other layout changes (here, on in general) were planned.

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[issue42144] A missing "goto" in the _ssl module!

[miss-islington]

miss-islington  added the comment:


New changeset 83c86cf54b36a7325f615f5adf22b28e48f0e72d by Miss Skeleton (bot) 
in branch '3.9':
bpo-42144: Add a missing "goto error;" in the _ssl module (GH-22959)
https://github.com/python/cpython/commit/83c86cf54b36a7325f615f5adf22b28e48f0e72d


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[issue42141] Speedup various dict inits

[Marco Sulla]

Marco Sulla  added the comment:

The fact is that, IMHO, PGO will "false" the results, since it's quite 
improbable that in the test battery there's a test of creation of a dict from 
another dict with an hole. It seems to me that the comparison between the 
normal builds are more significant.

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[issue7175] Define a standard location and API for configuration files

[Ronald Oussoren]

Change by Ronald Oussoren :


--
nosy:  -ronaldoussoren

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[issue41052] Opt out serialization/deserialization for heap type

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue15872] shutil.rmtree(..., ignore_errors=True) doesn't ignore all errors

[daniel hahler]

Change by daniel hahler :


--
nosy: +blueyed
nosy_count: 11.0 -> 12.0
pull_requests: +21883
pull_request: https://github.com/python/cpython/pull/22967

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[issue42141] Speedup various dict inits

[Inada Naoki]

Inada Naoki  added the comment:

I run pyperformance=1.0.0 for your speedup_dictinit branch (7df3b9c) and master 
branch, with PGO+LTO build.

```
$ ./python -m pyperf compare_to master-opt.json dictinit.json -G --min-speed=1
Slower (22):
- unpack_sequence: 62.7 ns +- 0.7 ns -> 70.3 ns +- 0.5 ns: 1.12x slower (+12%)
- pickle_dict: 28.6 us +- 0.1 us -> 30.7 us +- 0.1 us: 1.07x slower (+7%)
- regex_dna: 233 ms +- 1 ms -> 245 ms +- 0 ms: 1.05x slower (+5%)
- unpickle_list: 5.22 us +- 0.22 us -> 5.46 us +- 0.10 us: 1.05x slower (+5%)
- sqlite_synth: 3.29 us +- 0.05 us -> 3.43 us +- 0.05 us: 1.04x slower (+4%)
- regex_v8: 26.1 ms +- 0.1 ms -> 27.1 ms +- 0.4 ms: 1.04x slower (+4%)
- spectral_norm: 147 ms +- 1 ms -> 153 ms +- 2 ms: 1.04x slower (+4%)
- scimark_sparse_mat_mult: 5.28 ms +- 0.03 ms -> 5.48 ms +- 0.01 ms: 1.04x 
slower (+4%)
- unpickle_pure_python: 326 us +- 4 us -> 338 us +- 3 us: 1.04x slower (+4%)
- nbody: 143 ms +- 3 ms -> 148 ms +- 2 ms: 1.03x slower (+3%)
- regex_effbot: 3.43 ms +- 0.01 ms -> 3.53 ms +- 0.02 ms: 1.03x slower (+3%)
- django_template: 52.7 ms +- 0.7 ms -> 54.1 ms +- 0.9 ms: 1.03x slower (+3%)
- scimark_fft: 405 ms +- 4 ms -> 415 ms +- 9 ms: 1.03x slower (+3%)
- fannkuch: 523 ms +- 2 ms -> 535 ms +- 2 ms: 1.02x slower (+2%)
- xml_etree_process: 80.2 ms +- 0.8 ms -> 82.0 ms +- 0.8 ms: 1.02x slower (+2%)
- json_dumps: 14.6 ms +- 0.1 ms -> 14.9 ms +- 0.1 ms: 1.02x slower (+2%)
- scimark_sor: 209 ms +- 2 ms -> 213 ms +- 2 ms: 1.02x slower (+2%)
- genshi_text: 32.1 ms +- 0.5 ms -> 32.7 ms +- 0.4 ms: 1.02x slower (+2%)
- logging_format: 10.9 us +- 0.2 us -> 11.0 us +- 0.2 us: 1.02x slower (+2%)
- pyflate: 734 ms +- 6 ms -> 745 ms +- 8 ms: 1.01x slower (+1%)
- float: 134 ms +- 1 ms -> 135 ms +- 2 ms: 1.01x slower (+1%)
- raytrace: 511 ms +- 5 ms -> 517 ms +- 5 ms: 1.01x slower (+1%)

Faster (2):
- logging_silent: 209 ns +- 5 ns -> 205 ns +- 6 ns: 1.02x faster (-2%)
- pickle_list: 5.04 us +- 0.03 us -> 4.96 us +- 0.04 us: 1.02x faster (-2%)

Benchmark hidden because not significant (36):
```

I suppose all delta are noise. But there is a possibility small performance 
down caused by fatter binary.

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[issue42146] subprocess.Popen() leaks cwd in case of uid/gid overflow

[Alexey Izbyshev]

Change by Alexey Izbyshev :


--
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pull_request: https://github.com/python/cpython/pull/22970

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[issue42146] subprocess.Popen() leaks cwd in case of uid/gid overflow

[Alexey Izbyshev]

Change by Alexey Izbyshev :


--
type: behavior -> resource usage

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[issue41919] Modify test_codecs to use the new codecs.unregister() function

[hai shi]

hai shi  added the comment:

> AS this is masking other issues in the build bots, we need to revert the 
> commit unless is fixed in 24 hours per the buildbot workflow

Thanks, Pablo. I checked that only test_io.py have resource leak.
I create PR-22973, pls take a look if you have free time, thanks.

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[issue41919] Modify test_codecs to use the new codecs.unregister() function

[hai shi]

Change by hai shi :


--
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[issue39108] random needs doc for "gauss" versus "normalvariate"

[Raymond Hettinger]

Change by Raymond Hettinger :


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[issue42130] AsyncIO's wait_for can hide cancellation in a rare race condition

[Taras Voinarovskyi]

Taras Voinarovskyi  added the comment:

Hi Chris,
Yes, I do believe that is the respectful change, if we look the CancelledError 
is not checked to be external or originate from the timer. 
Best regards, 
Taras Voinarovskyi

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[issue42146] subprocess.Popen() leaks cwd in case of uid/gid overflow

[Alexey Izbyshev]

Change by Alexey Izbyshev :


--
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stage:  -> patch review

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[issue42147] Micro optimization for longrange iteration if step is 1

[Dong-hee Na]

Change by Dong-hee Na :


--
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pull_requests: +21886
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22971

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[issue39108] random needs doc for "gauss" versus "normalvariate"

[miss-islington]

Change by miss-islington :


--
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nosy_count: 4.0 -> 5.0
pull_requests: +21887
pull_request: https://github.com/python/cpython/pull/22972

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[issue37776] [subinterpreters] Test Py_Finalize() from a subinterpreter

[Lewis Gaul]

Change by Lewis Gaul :


--
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pull_requests: +21890
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/17575

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[issue41052] Opt out serialization/deserialization for heap type

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset 0aaecb30483e98fc29c1f4253967d05da092f0c5 by Serhiy Storchaka in 
branch '3.9':
[3.9] bpo-41052: Fix pickling heap types implemented in C with protocols 0 and 
1 (GH-22870). (GH-22963)
https://github.com/python/cpython/commit/0aaecb30483e98fc29c1f4253967d05da092f0c5


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[issue38865] [subinterpreters] Can Py_Finalize() be called if the current interpreter is not the main interpreter?

[Lewis Gaul]

Change by Lewis Gaul :


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[issue42147] Micro optimization for longrange iteration if step is 1

[Dong-hee Na]

Dong-hee Na  added the comment:

s/
I approach as same case that step=1 is quite a lot usecase until user designate 
step value.
/My assumtion is that step=1 is quite often usecase until user designate step 
value.

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[issue42145] test_io is leaking references

[hai shi]

hai shi  added the comment:

I created a possible fix PR: PR-22973

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[issue42148] floating point representation issues

[Eric V. Smith]

Eric V. Smith  added the comment:

This isn't a bug. It's due to the base 2 representation of floating point 
numbers. See for example: See 
https://docs.python.org/3/tutorial/floatingpoint.html

It's possible, depending on your use case, you might want to use the decimal 
module. But that has it's own issues that you should be aware of. For example, 
1/7 is not exactly representable in either floats or Decimals.

--
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resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue42144] A missing "goto" in the _ssl module!

[miss-islington]

miss-islington  added the comment:


New changeset 8e980ecfb7b42063ed41d665288aff69f0ed7fdc by Miss Skeleton (bot) 
in branch '3.8':
bpo-42144: Add a missing "goto error;" in the _ssl module (GH-22959)
https://github.com/python/cpython/commit/8e980ecfb7b42063ed41d665288aff69f0ed7fdc


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[issue41490] Update bundled pip to 20.2.1 and setuptools to 49.2.1

[Jason R. Coombs]

Jason R. Coombs  added the comment:


New changeset df8d4c83a6e1727e766191896aeabde886979587 by Jason R. Coombs in 
branch 'master':
bpo-41490: ``path`` and ``contents`` to aggressively close handles (#22915)
https://github.com/python/cpython/commit/df8d4c83a6e1727e766191896aeabde886979587


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[issue42146] subprocess.Popen() leaks cwd in case of uid/gid overflow

[Alexey Izbyshev]

New submission from Alexey Izbyshev :

The following test demonstrates the leak:

```
import subprocess

cwd = 'x' * 10**6
for __ in range(100):
try:
subprocess.call(['/xxx'], cwd=cwd, user=2**64)
except OverflowError:
pass

from resource import *
print(getrusage(RUSAGE_SELF).ru_maxrss)
```

The leak was introduced by bpo-36046. Previously, `cleanup:` label was not 
reachable after `cwd_obj2` was initialized at 
https://github.com/python/cpython/blob/492d513ccbebeec40a8ba85cbd894a027ca5b2b3/Modules/_posixsubprocess.c#L892

I'll submit a PR with a simple fix suitable for backporting to 3.9.

Also, I think it might make sense to unify the two almost-identical cleanup 
paths we have now. I'll follow up with another PR.

--
assignee: izbyshev
components: Extension Modules
keywords: 3.9regression
messages: 379575
nosy: gregory.p.smith, izbyshev, patrick.mclean
priority: normal
severity: normal
status: open
title: subprocess.Popen() leaks cwd in case of uid/gid overflow
type: behavior
versions: Python 3.10, Python 3.9

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[issue42146] subprocess.Popen() leaks cwd in case of uid/gid overflow

[Alexey Izbyshev]

Alexey Izbyshev  added the comment:

I've submitted both PRs.

Regarding PR 22970:

* I made it a draft since we'd probably want to fix the leak first, but then it 
will have to be rebased. 

* It fixes a bug with _enable_gc(): if it failed after fork(), we'd raise 
OSError instead. Additionally, if fork() succeeded(), the errno inside OSError 
would be zero, and we'd leak the child process.

--
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stage: patch review -> 

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[issue42147] Micro optimization for longrange iteration if step is 1

[Dong-hee Na]

New submission from Dong-hee Na :

This is a similar case with https://bugs.python.org/issue41902
A quite possible usecase when the user use range with big number

./python -m pyperf compare_to longrange_master.json longrange_opt.json
Mean +- std dev: [longrange_master] 6.45 us +- 0.09 us -> [longrange_opt] 5.72 
us +- 0.07 us: 1.13x faster (-11%)

--
assignee: corona10
components: Interpreter Core
files: bench_longrange.py
messages: 379578
nosy: corona10, methane, vstinner
priority: normal
severity: normal
status: open
title: Micro optimization for longrange iteration if step is 1
type: performance
versions: Python 3.10
Added file: https://bugs.python.org/file49539/bench_longrange.py

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[issue24427] subclass of multiprocessing Connection segfault upon attribute acces

[Irit Katriel]

Change by Irit Katriel :


--
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stage: needs patch -> resolved
status: open -> closed

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[issue42147] Micro optimization for longrange iteration if step is 1

[Dong-hee Na]

Dong-hee Na  added the comment:

At bpo-41092, we decide not to optimize mulitply operation itself.

I approach as same case that step=1 is quite a lot usecase until user designate 
step value.

If range with longobject is not that much use case, I can agree with your 
opinion

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[issue32122] Improve -x option documentation

[Inada Naoki]

Change by Inada Naoki :


--
keywords: +newcomer friendly
versions: +Python 3.10 -Python 2.7, Python 3.6, Python 3.7

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[issue30681] email.utils.parsedate_to_datetime() should return None when date cannot be parsed

[Ned Deily]

Change by Ned Deily :


--
nosy:  -ned.deily
versions:  -Python 3.7

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[issue41662] Bugs in binding parameters in sqlite3

[Inada Naoki]

Inada Naoki  added the comment:


New changeset a053a7ecfef006b834a9957468fa461dafb332db by Miss Skeleton (bot) 
in branch '3.8':
bpo-41662: Fix bugs in binding parameters in sqlite3 (GH-21998)
https://github.com/python/cpython/commit/a053a7ecfef006b834a9957468fa461dafb332db


--
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[issue41100] Build failure on macOS 11 (beta)

[Ronald Oussoren]

Change by Ronald Oussoren :


--
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pull_request: https://github.com/python/cpython/pull/21115

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[issue30181] Correct the parsing of a test case docstring.

[Chris Jerdonek]

Chris Jerdonek  added the comment:

I'm closing this as a duplicate of issue 39450, which has been resolved.

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> unittest TestCase shortDescription does not strip whitespace

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[issue42140] asyncio.wait function creates futures set two times

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Are you suggesting this is a bug, or is it just a suggested code cleanup? I ask 
because the docs suggest that a set should be passed:
https://docs.python.org/3/library/asyncio-task.html#asyncio.wait

And the docstring says it should be a sequence:
https://github.com/python/cpython/blob/d1a0a960ee493262fb95a0f5b795b5b6d75cecb8/Lib/asyncio/tasks.py#L373-L376

So while code cleanup is okay, I'm not sure support for general iterator 
arguments can / should be guaranteed.

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[issue12832] The documentation for the print function should explain/point to how to control the sys.stdout encoding

[Irit Katriel]

Change by Irit Katriel :


--
type:  -> enhancement
versions: +Python 3.10, Python 3.9 -Python 2.7, Python 3.2, Python 3.3

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[issue42148] floating point representation issues

[Eric V. Smith]

Eric V. Smith  added the comment:

Thanks for double-checking the other languages, Steven.

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[issue42147] Micro optimization for longrange iteration if step is 1

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

My particular opinion is that I would advise against having more branching, 
especially for code that is rare: it augments the possibilities of branch 
mispredictions, the changes of untested code paths, and the possibilities of 
unknown interactions. In this case, I agree that the code is simple enough, but 
I still feel that the cost may not be worth the extra maintenance needs of 
those branches.

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[issue42151] Pure Python xml.etree.ElementTree is missing default attribute values

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
nosy: +eli.bendersky, scoder, serhiy.storchaka

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[issue42140] asyncio.wait function creates futures set two times

[Denis S. Otkidach]

Denis S. Otkidach  added the comment:

The current error message is way too cryptic anyway.  And restricting it to the 
set type only, as in docs, will certainly break a lot of code (passing a list 
is quite common).

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[issue33557] Windows multiprocessing doesn't propagate tabcheck to children

[Inada Naoki]

Inada Naoki  added the comment:

Python 2.7 became EOL.

--
nosy: +methane
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue42151] Pure Python xml.etree.ElementTree is missing default attribute values

[Felix C. Stegerman]

New submission from Felix C. Stegerman :

I originally reported this as a bug in PyPy, but it turns out that CPython's C 
implementation (_elementtree) behaves differently than the pure Python version 
(b/c it sets specified_attributes = 1).

PyPy issue with example code: https://foss.heptapod.net/pypy/pypy/-/issues/

--
components: Library (Lib)
messages: 379637
nosy: obfusk
priority: normal
severity: normal
status: open
title: Pure Python xml.etree.ElementTree is missing default attribute values
type: behavior
versions: Python 3.10, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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[issue42151] Pure Python xml.etree.ElementTree is missing default attribute values

[Dong-hee Na]

Change by Dong-hee Na :


--
nosy: +corona10

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[issue39871] math.copysign raises SystemError with non-float x and custom y

[Inada Naoki]

Inada Naoki  added the comment:


New changeset f6255a2ccb55a63194caf698f471c803c08be359 by Zackery Spytz in 
branch '3.8':
bpo-39871: Fix an error in a news entry (GH-21749)
https://github.com/python/cpython/commit/f6255a2ccb55a63194caf698f471c803c08be359


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[issue42043] zipfile.Path should support inheritance

[Jason R. Coombs]

Jason R. Coombs  added the comment:


New changeset d1a0a960ee493262fb95a0f5b795b5b6d75cecb8 by Jason R. Coombs in 
branch 'master':
bpo-42043: Add support for zipfile.Path subclasses (#22716)
https://github.com/python/cpython/commit/d1a0a960ee493262fb95a0f5b795b5b6d75cecb8


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[issue42147] Micro optimization for longrange iteration if step is 1

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

I concur with Serhiy

--
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[issue2679] email.feedparser regex duplicate

[Irit Katriel]

Change by Irit Katriel :


--
type: behavior -> 
versions: +Python 3.10, Python 3.8, Python 3.9 -Python 2.6, Python 2.7, Python 
3.1, Python 3.2, Python 3.3

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[issue42150] Buffer overflow in bad_single_statement (Parser/pegen.c)

[miss-islington]

miss-islington  added the comment:


New changeset 0b290dd2171e745d94f48298cafb2327eb2de17c by Miss Skeleton (bot) 
in branch '3.9':
bpo-42150: Avoid buffer overflow in the new parser (GH-22978)
https://github.com/python/cpython/commit/0b290dd2171e745d94f48298cafb2327eb2de17c


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[issue12930] reindent.py inserts spaces in multiline literals

[Dima Tisnek]

Dima Tisnek  added the comment:

Given the trajectory of this bug, would it be easier to remove `reindent.py` 
from cpython code base entirely?

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[issue42147] Micro optimization for longrange iteration if step is 1

[Dong-hee Na]

Dong-hee Na  added the comment:

@pablogsal, @serhiy.storchaka

> I would advise against having more branching, especially for code that is 
> rare:

About bpo-41902, I believe those patches affect all range objects which is 
created with step is one .

I believe the usage of creation of range object with range(start), range(start, 
stop) is more than range(start, stop, step) unless there is significant proof 
that users prefer to create with range(start, stop, step)

So I think that those patches are worth to do it.

but PR 22971 is only affecting to longrange iteration.
it means if there no worth to optimize range(start), range(start, stop) when 
the start and stop is big number, this issue could be rejected.

And if the patch is rejected, I would like to suggest write a comment on the 
codeline for the future contributors why we decided to not optimizing this.

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[issue42147] Micro optimization for longrange iteration if step is 1

[Inada Naoki]

Inada Naoki  added the comment:

> On the other hand, GH-22479 is affect to all index API() whether the number 
> is large or small.

Then, no need to revert GH-22479 for consistency. Thanks.

> p.s by the way, Naoki is the last name or first name? ;)

It is difficult to say what is first name. Inada is surname and Naoki is given 
name. Surname comes first in Japanese.

Traditionally, we used reversed name order when write name in English to follow 
English-world manner. But China and Korea don't reverse name. And Japan is 
stopping reversed name order too. Japanese junior high schools teach 
surname-given name since about 2000.

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[issue42090] zipfile.Path.joinpath API inconsistent with pathlib.Path.joinpath

[Jason R. Coombs]

Change by Jason R. Coombs :


--
keywords: +patch
pull_requests: +21893
stage: backport needed -> patch review
pull_request: https://github.com/python/cpython/pull/22976

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[issue42149] Python 'make test' failed inside ssh+tmux

[Kostiantyn Mashukov]

Kostiantyn Mashukov  added the comment:

Does it mean that running python script inside ssh+tmux session could fail if 
it uses functionality that fails those tests?

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[issue42150] Buffer overflow in bad_single_statement (Parser/pegen.c)

[Pablo Galindo Salgado]

New submission from Pablo Galindo Salgado :

Building Python with the address sanitizer and executing ./python -m test 
test_repl -v shows this:

===
==26216==ERROR: AddressSanitizer: heap-buffer-overflow on address 
0x6023990f at pc 0x5625406527b2 bp 0x7ffe8d621910 sp 0x7ffe8d621900
READ of size 1 at 0x6023990f thread T0
#0 0x5625406527b1 in bad_single_statement Parser/pegen.c:993
#1 0x5625406527b1 in _PyPegen_run_parser Parser/pegen.c:1136
#2 0x5625406529b8 in _PyPegen_run_parser_from_file_pointer 
Parser/pegen.c:1179
#3 0x5625403f1945 in PyRun_InteractiveOneObjectEx Python/pythonrun.c:208
#4 0x5625403f3cd9 in PyRun_InteractiveLoopFlags Python/pythonrun.c:115
#5 0x5625403f4e3f in PyRun_AnyFileExFlags Python/pythonrun.c:74
#6 0x562540181792 in pymain_run_stdin Modules/main.c:512
#7 0x562540181792 in pymain_run_python Modules/main.c:601
#8 0x562540182904 in Py_RunMain Modules/main.c:677
#9 0x562540182904 in pymain_main Modules/main.c:707
#10 0x562540182904 in Py_BytesMain Modules/main.c:731
#11 0x7f25297aa151 in __libc_start_main (/usr/lib/libc.so.6+0x28151)
#12 0x56254017f0bd in _start 
(/home/pablogsal/github/python/master/python+0x1640bd)

0x6023990f is located 1 bytes to the left of 2-byte region 
[0x60239910,0x60239912)
allocated by thread T0 here:
#0 0x7f2529b70459 in __interceptor_malloc 
/build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:145
#1 0x562540553416 in tok_nextc Parser/tokenizer.c:872
#2 0x562540554eb7 in tok_get Parser/tokenizer.c:1190
#3 0x562540559590 in PyTokenizer_Get Parser/tokenizer.c:1839
#4 0x56254064f6dd in _PyPegen_fill_token Parser/pegen.c:584
#5 0x5625406934a7 in statement_newline_rule Parser/parser.c:1296
#6 0x5625406934a7 in interactive_rule Parser/parser.c:769
#7 0x5625406934a7 in _PyPegen_parse Parser/parser.c:24823
#8 0x562540652382 in _PyPegen_run_parser Parser/pegen.c:
#9 0x5625406529b8 in _PyPegen_run_parser_from_file_pointer 
Parser/pegen.c:1179
#10 0x5625403f1945 in PyRun_InteractiveOneObjectEx Python/pythonrun.c:208
#11 0x5625403f3cd9 in PyRun_InteractiveLoopFlags Python/pythonrun.c:115
#12 0x5625403f4e3f in PyRun_AnyFileExFlags Python/pythonrun.c:74
#13 0x562540181792 in pymain_run_stdin Modules/main.c:512
#14 0x562540181792 in pymain_run_python Modules/main.c:601
#15 0x562540182904 in Py_RunMain Modules/main.c:677
#16 0x562540182904 in pymain_main Modules/main.c:707
#17 0x562540182904 in Py_BytesMain Modules/main.c:731
#18 0x7f25297aa151 in __libc_start_main (/usr/lib/libc.so.6+0x28151)

SUMMARY: AddressSanitizer: heap-buffer-overflow Parser/pegen.c:993 in 
bad_single_statement
Shadow bytes around the buggy address:
  0x0c0472d0: fa fa 00 04 fa fa 00 01 fa fa 00 04 fa fa 00 04
  0x0c0472e0: fa fa 00 04 fa fa 00 04 fa fa 00 04 fa fa 00 04
  0x0c0472f0: fa fa 00 04 fa fa 00 04 fa fa 00 04 fa fa 00 07
  0x0c047300: fa fa 00 04 fa fa 00 04 fa fa 06 fa fa fa 00 fa
  0x0c047310: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
=>0x0c047320: fa[fa]02 fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0c047330: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047340: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047350: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047360: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047370: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:   00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:   fa
  Freed heap region:   fd
  Stack left redzone:  f1
  Stack mid redzone:   f2
  Stack right redzone: f3
  Stack after return:  f5
  Stack use after scope:   f8
  Global redzone:  f9
  Global init order:   f6
  Poisoned by user:f7
  Container overflow:  fc
  Array cookie:ac
  Intra object redzone:bb
  ASan internal:   fe
  Left alloca redzone: ca
  Right alloca redzone:cb
  Shadow gap:  cc
==26216==ABORTING

--
components: Interpreter Core
messages: 379607
nosy: lys.nikolaou, pablogsal
priority: normal
severity: normal
status: open
title: Buffer overflow in bad_single_statement (Parser/pegen.c)
versions: Python 3.10

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[issue36207] robotsparser deny all with some rules

[Nicolas]

Nicolas  added the comment:

Seems like we have the same issue with http://meridigital.com/robots.txt

--
nosy: +nico702 -matthieuhemea

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[issue4246] doc: execution model - clear and complete example in documentation

[Irit Katriel]

Change by Irit Katriel :


--
title: execution model - clear and complete example in documentation -> doc: 
execution model - clear and complete example in documentation
versions: +Python 3.10, Python 3.9 -Python 2.7, Python 3.2, Python 3.3

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[issue1490929] urllib.retrieve's reporthook called with non-helpful value

[Irit Katriel]

Irit Katriel  added the comment:

The code in urllib is different now but I see that a test very similar to the 
one in the patch exists, so was this fixed?

https://github.com/python/cpython/blob/e68c67805e6a4c4ec80bea64be0e8373cc02d322/Lib/test/test_urllib.py#L813

--
nosy: +iritkatriel
status: open -> pending

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[issue42148] floating point representation issues

[Steven D'Aprano]

Steven D'Aprano  added the comment:

Eric I would normally agree with you but the only thing which gives me pause is 
the statement that this doesn't occur with C, Lua and Perl.

That alone doesn't mean much. Different interpreters can use different 
algorithms for printing floats, Python changed its algorithm in 3.1 and 
backported it to 2.7:

https://docs.python.org/3.1/whatsnew/3.1.html#other-language-changes

and now uses Gay's algorithm which will often give different, shorter, results 
than other algorithms. Other languages do other things, for example R is 
notorious for just terminating the float output after a few decimal places, so 
you have numbers which look identical but are unequal.

Andrea, do you still think this is a bug? Can you demonstrate some code in 
another language that shows the output you expect? (Preferably an interpreter 
rather than C.)

Most importantly, can you demonstrate that the other language's output is 
correct and Python's is wrong? In particular, are you sure that the output in 
those other languages is not just rounding the result to a certain number of 
decimal places?

If you can satisfy those, please re-open the ticket, otherwise I expect that 
Eric is correct.

--
nosy: +steven.daprano

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[issue41916] cxx pthread check is not overrideable

[Dustin Spicuzza]

Dustin Spicuzza  added the comment:

FWIW, I've been using the patch in my PR and it seems to work.

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[issue42144] A missing "goto" in the _ssl module!

[Christian Heimes]

Christian Heimes  added the comment:

Thanks, excellent finding.

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
type:  -> behavior

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[issue12737] str.title() is overzealous by upcasing combining marks inappropriately

[Irit Katriel]

Irit Katriel  added the comment:

Of the examples given two seem ok now, but the Istanbul one is still wrong:

>>> "déme un café".title()
'Déme Un Café'
>>> "ᾲ στο διάολο".title()
'Ὰͅ Στο Διάολο'
>>>

>>> "i̇stanbul".title()
'İStanbul'

--
nosy: +iritkatriel
versions: +Python 3.10, Python 3.9 -Python 3.2, Python 3.3

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[issue42147] Micro optimization for longrange iteration if step is 1

[Inada Naoki]

Inada Naoki  added the comment:

I had not noticed that there are rangeobject and longrangeobject. It doesn't 
affect to range(1) definitely.

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[issue42147] Micro optimization for longrange iteration if step is 1

[Dong-hee Na]

Dong-hee Na  added the comment:

@methane

To be more precise, [[] for _ in range(1)] will not effort this patch 
because range(1) does not create longrangeiter object.
This patch will affect to if the number is veeery large.

On the other hand, GH-22479 is affect to all index API() whether the number is 
large or small.

p.s by the way, Naoki is the last name or first name? ;)

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[issue42147] Micro optimization for longrange iteration if step is 1

[Dong-hee Na]

Dong-hee Na  added the comment:

s / will not effort / will not be affected

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[issue42149] Python 'make test' failed inside ssh+tmux

[Kostiantyn Mashukov]

New submission from Kostiantyn Mashukov :

Short version:
When building python from source code on linux (Debian10 amd64) inside ssh+tmux 
session 'make test' ends up with some tests failed.
  
Long version:
Build environment - freshly installed Debian10-amd64 os. Added build dependency 
packages: libreadline-dev libbz2-dev libffi-dev liblzma-dev libssl-dev 
libsqlite3-dev libgdbm-dev libncursesw5-dev tk-dev libgdbm-compat-dev

If you ssh to this machine, start tmux and initiate build like this:
./configure && make && make test
the whole testing phase will fail due to some failed tests.

7 tests failed: 

  
   test_generators test_multiprocessing_fork

 
   test_multiprocessing_forkserver test_multiprocessing_spawn   


   test_pdb test_regrtest test_threading

 


  
14 tests skipped:   

  
   test_devpoll test_gdb test_ioctl test_kqueue test_msilib 

  
   test_ossaudiodev test_startfile test_tix test_tk test_ttk_guionly

 
test_winconsoleio test_winreg test_winsound test_zipfile64  

  


  
7 re-run tests: 

  
test_generators test_multiprocessing_fork   

  
test_multiprocessing_forkserver test_multiprocessing_spawn  

  
test_pdb test_regrtest test_threading   

  


  
Total duration: 10 min 34 sec   

  
Tests result: FAILURE then FAILURE
-
Running the same build process on the same machine ends up fine, if running: 
locally inside xterm, locally inside xterm+tmux, remotely inside ssh only 
(without tmux).

--
components: Build
messages: 379603
nosy: kmash
priority: normal
severity: normal
status: open
title: Python 'make test' failed inside ssh+tmux
versions: Python 3.9

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[issue27495] Pretty printing sorting for set and frozenset instances

[Ben Bonenfant]

Change by Ben Bonenfant :


--
nosy: +bbonenfant
nosy_count: 6.0 -> 7.0
pull_requests: +21894
pull_request: https://github.com/python/cpython/pull/22977

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[issue42150] Buffer overflow in bad_single_statement (Parser/pegen.c)

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


--
keywords: +patch
pull_requests: +21895
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22978

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