[issue41972] bytes.find consistently hangs in a particular scenario

[Tim Peters]

Tim Peters  added the comment:

Impressive, Dennis! Nice work.

FYI, on the OP's original test data, your fastsearch() completes each search in 
under 20 seconds using CPython, and in well under 1 second using PyPy.

Unfortunately, that's so promising it can't just be dismissed offhandedly ;-)  
Looks like something quite worth pursuing here!

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[issue41756] Do not always use exceptions to return result from coroutine

[Vladimir Matveev]

Change by Vladimir Matveev :


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[issue41739] test_logging: test_race_between_set_target_and_flush() leaks threads (threading_cleanup() failed to cleanup ...)

[Vinay Sajip]

Vinay Sajip  added the comment:


New changeset f5393dc2a0ced7bf670ebc56b5fd10a3eb328d1a by Victor Stinner in 
branch '3.9':
bpo-41739: Fix test_logging.test_race_between_set_target_and_flush() (GH-22655) 
(GH-22656)
https://github.com/python/cpython/commit/f5393dc2a0ced7bf670ebc56b5fd10a3eb328d1a


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[issue41739] test_logging: test_race_between_set_target_and_flush() leaks threads (threading_cleanup() failed to cleanup ...)

[miss-islington]

Change by miss-islington :


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[issue40422] Light refactor: create a common _Py_closerange API

[Gregory P. Smith]

Gregory P. Smith  added the comment:

Just reuse this bpo issue.  I'll mark the PRs as "skip news"; don't worry about 
a new news blurb entry as it's all tied to the original one.

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[issue42007] Line continuation after Boolean operation

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Sorry, I don't think this proposal has a chance.  

Python doesn't require statement terminators like ";" in C.  Accordingly, it 
needs to have a clean and consistent rule to close a statement.  The rule that 
has worked well for us it that a statement is terminated by a newline unless 
there is a line continuation character, or a colon to begin a new suite, or an 
open expression delimiter (parenthesis, square bracket or curly brace). 

Adding a special case exception to the rule might look nice but would 
complicate learning the language, and it would complicate the implementation as 
well.

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[issue40422] Light refactor: create a common _Py_closerange API

[Kyle Evans]

Kyle Evans  added the comment:

Would you like that on a distinct issue, or is it ok to reuse this BPO since 
it's a location improvement of an API just introduced?

I've got a local branch now that:

1. moves the suppress IPH stuff into _Py_closerange
2. moves the definition into Python/fileutils.c
3. moves the declaration into Include/fileutils h

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[issue41995] five possible Null Pointer Dereference bugs.

[Roundup Robot]

Change by Roundup Robot :


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[issue37449] Move ensurepip off of pkgutil and to importlib.resources

[wim glenn]

Change by wim glenn :


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[issue41989] htmlparser unclosed script tag causes data loss

[Waylan Limberg]

Change by Waylan Limberg :


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[issue25567] shlex.quote doesn't work on bytestrings

[Hassan Abouelela]

Change by Hassan Abouelela :


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[issue40213] contextlib.aclosing()

[John Belmonte]

Change by John Belmonte :


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[issue41739] test_logging: test_race_between_set_target_and_flush() leaks threads (threading_cleanup() failed to cleanup ...)

[STINNER Victor]

Change by STINNER Victor :


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[issue41739] test_logging: test_race_between_set_target_and_flush() leaks threads (threading_cleanup() failed to cleanup ...)

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 13ff396c019d548ba181cf22c6f39309a300723c by Victor Stinner in 
branch 'master':
bpo-41739: Fix test_logging.test_race_between_set_target_and_flush() (GH-22655)
https://github.com/python/cpython/commit/13ff396c019d548ba181cf22c6f39309a300723c


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[issue40422] Light refactor: create a common _Py_closerange API

[STINNER Victor]

STINNER Victor  added the comment:

Python/fileutils.c might be a better home for such helper function.

You might move _Py_BEGIN_SUPPRESS_IPH / _Py_END_SUPPRESS_IPH macros into 
_Py_closerange(), even if currently it makes no diffence. 
(_Py_BEGIN_SUPPRESS_IPH is specific to Windows, os.closerange() uses it, and 
_posixsubprocess doesn't need it since it's not used on Windows.)

See also the idea of reminding if the kernel supports the syscall or not:
https://github.com/python/cpython/pull/22651#pullrequestreview-506215041

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[issue42006] Stop using PyDict_GetItem, PyDict_GetItemString and _PyDict_GetItemId

[STINNER Victor]

STINNER Victor  added the comment:

I don't want to hold fixing the code right now. If we decide to break the 
backward compatibility of the C API, a transition plan will likely take a few 
years anyway, whereas this issue should be first as soon as possible.

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[issue42006] Stop using PyDict_GetItem, PyDict_GetItemString and _PyDict_GetItemId

[STINNER Victor]

STINNER Victor  added the comment:

PyDict_GetItem() behavior is an old wart. Would it make sense to plan a 
migration plan to slowly move towards PyDict_GetItem() behaving as 
PyDict_GetItemWithError()?

CPython is an old code base full of corner cases. But outside CPython, is it 
common to rely on the current PyDict_GetItem() behavior (ignore errors, can be 
called with an exception raised)?

(A) For example, would it make sense to start to emit a DeprecationWarning when 
it's called with an exception raised? Currently, the function calls 
_PyErr_Fetch(): checking if exc_type is non-NULL requires to add an if which 
would add a cost to all PyDict_GetItem() calls. But IMO it would be interesting 
to fix this function in the long term.

(B) Also, would it make sense to start to no longer ignore base exceptions like 
SystemExit, KeyboardInterrupt or MemoryError in PyDict_GetItem()?

How can we take a decision on that? Analyze the C code base of a bunch of 
popular C extension? Make the change and await to see how many people complain?

In the long term, I would prefer that PyDict_GetItem() behaves as other C 
functions: it should not be called with an exception raised (the caller has to 
store/restore the current exception), and raises an exception on error. I 
expect better performance for such more regular and simpler behavior.

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[issue38250] enum.Flag should be more set-like

[John Belmonte]

John Belmonte  added the comment:

I think https://github.com/python/cpython/pull/1 should be reverted 
(considering the design issue, performance issue, and bugs), and lets have a 
proper design and review.

While just reading the code, I found an existing bug in Flag.  And the new 
__iter__ uses the buggy internal function, and so itself has bugs.

https://github.com/python/cpython/pull/1#issuecomment-706776441

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[issue42006] Stop using PyDict_GetItem, PyDict_GetItemString and _PyDict_GetItemId

[STINNER Victor]

STINNER Victor  added the comment:

See also old issues about PyDict_GetItemWithError():

* bpo-20615
* bpo-30475
* bpo-35459

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[issue41739] test_logging: test_race_between_set_target_and_flush() leaks threads (threading_cleanup() failed to cleanup ...)

[STINNER Victor]

Change by STINNER Victor :


--
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pull_requests: +21631
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22655

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[issue41739] test_logging: test_race_between_set_target_and_flush() leaks threads (threading_cleanup() failed to cleanup ...)

[STINNER Victor]

STINNER Victor  added the comment:

I'm able to reproduce the issue if I reduce the sleep:

diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 4cd8c7e25d..fc395dc473 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -1177,7 +1177,7 @@ class MemoryHandlerTest(BaseTest):
 self.mem_hdlr.setTarget(target)
 
 for _ in range(10):
-time.sleep(0.005)
+time.sleep(1e-9)
 self.mem_logger.info("not flushed")
 self.mem_logger.warning("flushed")
 


With the command:

$ ./python -m test test_logging -m test_race_between_set_target_and_flush -F 
-j10 --fail-env-changed 
(...)
0:00:03 load avg: 3.74 [ 18/1] test_logging failed (env changed)
Warning -- threading_cleanup() failed to cleanup 1 threads (count: 1, dangling: 
2)
Warning -- Dangling thread: 
Warning -- Dangling thread: <_MainThread(MainThread, started 139861194377024)>

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[issue41739] test_logging: test_race_between_set_target_and_flush() leaks threads (threading_cleanup() failed to cleanup ...)

[STINNER Victor]

STINNER Victor  added the comment:

Cool, my threading change works as expected! The name of the target function 
was logged.

https://buildbot.python.org/all/#/builders/509/builds/172

0:00:28 load avg: 3.58 [ 36/424/1] test_logging failed (env changed)
Warning -- threading_cleanup() failed to cleanup 2 threads (count: 2, dangling: 
3)
Warning -- Dangling thread: 
Warning -- Dangling thread: 
Warning -- Dangling thread: <_MainThread(MainThread, started 4396920310576)>

So leaked threads are running removeTarget() which come from 
MemoryHandlerTest.test_race_between_set_target_and_flush().

--
title: test_logging: threading_cleanup() failed to cleanup 1 threads (count: 1, 
dangling: 2) -> test_logging: test_race_between_set_target_and_flush() leaks 
threads (threading_cleanup() failed to cleanup ...)

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[issue42008] Internal Random class calling seed() with incorrect argument

[Raymond Hettinger]

New submission from Raymond Hettinger :

The C code in random_new() incorrectly calls random_seed() with an args tuple. 
Instead, it should use first element of the args tuple.

This matters because we've deprecated using PyObject_Hash() in random_seed().  
Once that is removed, _random.Random(someseed) won't work at all (there's a 
test for it).

# Public API is correct
>>> from random import Random
>>> r = Random()
>>> r.seed(8675309)
>>> r.random()
0.40224696110279223
>>> r = Random(8675309)
>>> r.random()
0.40224696110279223

# Private API is incorrect for Random(someseed)
>>> from _random import Random
>>> r = Random()
>>> r.seed(8675309)
>>> r.random()
0.40224696110279223
>>> r = Random(8675309)  
>>> r.random()
0.21095576307886765  <=== This is wrong

--
components: Extension Modules
keywords: easy (C)
messages: 378457
nosy: rhettinger
priority: normal
severity: normal
status: open
title: Internal Random class calling seed() with incorrect argument
type: behavior
versions: Python 3.10, Python 3.8, Python 3.9

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[issue39101] IsolatedAsyncioTestCase freezes when exception is raised

[Lisa Roach]

Change by Lisa Roach :


--
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[issue38250] enum.Flag should be more set-like

[Vedran Čačić]

Vedran Čačić  added the comment:

Of course, if it returns True only on _some_ bits combinations it doesn't make 
sense. I thought every element of a Boolean span would be _in_ the Foo.

But about "zero bit", I still think it's perfectly analogous to '' in 'abc'.

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[issue38250] enum.Flag should be more set-like

[John Belmonte]

John Belmonte  added the comment:

> Just a comment, (1) is analogous to str. iter('abc') gives only 'a', 'b' and 
> 'c', while contains accepts '', 'ab', 'bc', and 'abc' too. At least in my 
> mind, it's a pretty strong analogy.

I don't agree.  The "zero" bit does not exist, so having __contains__ return 
True on `Foo(0) in x` is misaligned with the iterator.  And having __contains__ 
return True for specific compound values just because they happen to be 
explicitly defined, while returning False for others, is arbitrary.  
__contains__ seems to be of very little use, and moreover a trap for the 
unwary.  Assuming we have to live with that until Python 4, it's better to make 
an explicit iterator like `bits()` so that the API doesn't contradict itself.

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[issue41971] multiple tests in test_tools fail since Python 3.9

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 4af672921949b8a10340d5e29b456091060cedeb by Miss Skeleton (bot) 
in branch '3.9':
bpo-41971: Fix test failure in test.test_tools.test_c_analyzer when mutating 
global state (GH-22652) (GH-22653)
https://github.com/python/cpython/commit/4af672921949b8a10340d5e29b456091060cedeb


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[issue33802] Regression in logging configuration

[Kyle Evans]

Change by Kyle Evans :


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[issue6721] Locks in the standard library should be sanitized on fork

[Kyle Evans]

Change by Kyle Evans :


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[issue36533] logging regression with threading + fork are mixed in 3.7.1rc2 (deadlock potential)

[Kyle Evans]

Change by Kyle Evans :


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[issue41971] multiple tests in test_tools fail since Python 3.9

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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

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[issue41971] multiple tests in test_tools fail since Python 3.9

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 47ecfd8030c391779dd9d3b4b07e6b01a8392481 by Pablo Galindo in 
branch 'master':
bpo-41971: Fix test failure in test.test_tools.test_c_analyzer when mutating 
global state (GH-22652)
https://github.com/python/cpython/commit/47ecfd8030c391779dd9d3b4b07e6b01a8392481


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[issue41971] multiple tests in test_tools fail since Python 3.9

[miss-islington]

Change by miss-islington :


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nosy_count: 6.0 -> 7.0
pull_requests: +21626
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[issue27635] pickle documentation says that unpickling may not call __new__

[Alexandre Vassalotti]

Change by Alexandre Vassalotti :


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[issue40423] Optimization: use close_range(2) if available

[miss-islington]

miss-islington  added the comment:


New changeset 1800c600801709958af66bebfa683a4e7570810f by Kyle Evans in branch 
'master':
bpo-40423: Optimization: use close_range(2) if available (GH-22651)
https://github.com/python/cpython/commit/1800c600801709958af66bebfa683a4e7570810f


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[issue27635] pickle documentation says that unpickling may not call __new__

[Irit Katriel]

Irit Katriel  added the comment:

Ping (to close the issue).

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[issue38110] Use fdwalk() within os.closerange() impl if available

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue40423] Optimization: use close_range(2) if available

[Gregory P. Smith]

Change by Gregory P. Smith :


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assignee:  -> gregory.p.smith

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[issue41971] multiple tests in test_tools fail since Python 3.9

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


--
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pull_requests: +21625
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22652

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[issue41971] multiple tests in test_tools fail since Python 3.9

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Seems that the problem is that this check:

https://github.com/python/cpython/blob/master/Tools/c-analyzer/c_analyzer/common/files.py#L90

is done using a default value for "get_files":

https://github.com/python/cpython/blob/master/Tools/c-analyzer/c_analyzer/common/files.py#L63

But the import from source creates a new function for os.walk and therefore the 
comparison fails.

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[issue40423] Optimization: use close_range(2) if available

[Gregory P. Smith]

Gregory P. Smith  added the comment:

Ah, yeah ENOSYS is it.  I had to do this trick in older subprocess versions for 
something else.  Still visible here in the old 2.7 backport: 
https://github.com/google/python-subprocess32/blob/main/_posixsubprocess.c#L801

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[issue40423] Optimization: use close_range(2) if available

[Kyle Evans]

Change by Kyle Evans :


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[issue40422] Light refactor: create a common _Py_closerange API

[Gregory P. Smith]

Change by Gregory P. Smith :


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status: open -> closed

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[issue40423] Optimization: use close_range(2) if available

[Kyle Evans]

Kyle Evans  added the comment:

Ah, I will fix this and then submit a PR, thanks... hopefully it returns ENOSYS.

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[issue40422] Light refactor: create a common _Py_closerange API

[miss-islington]

miss-islington  added the comment:


New changeset c230fde8475e4e5581e74a4235654d17ccf4cff8 by Kyle Evans in branch 
'master':
bpo-40422: create a common _Py_closerange API (GH-19754)
https://github.com/python/cpython/commit/c230fde8475e4e5581e74a4235654d17ccf4cff8


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[issue41971] multiple tests in test_tools fail since Python 3.9

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Adding Eric Snow as this seems to be something going on on the c_analyzer

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[issue40422] Light refactor: create a common _Py_closerange API

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue40423] Optimization: use close_range(2) if available

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue40423] Optimization: use close_range(2) if available

[Gregory P. Smith]

Gregory P. Smith  added the comment:

for reference, very recent Linux kernels appear to have gained a close_range 
syscall.  http://lkml.iu.edu/hypermail/linux/kernel/2008.0/02649.html

Your diff isn't quite sufficient as is.  When depending on a syscall that has a 
function provided by libc, the libc function may exist (thus HAVE_CLOSE_RANGE 
will be true at Python compile time) but the system the process is running on 
may not support the system call.  So it'll return an EINVAL (or something like 
that) error.

Special handling of that error to add an `else {...}` falling back to the other 
codepath is necessary.

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[issue26964] Incorrect documentation for `-u`-flag

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue41376] site.getusersitepackages() incorrectly claims that PYTHONNOUSERSITE is respected

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue41376] site.getusersitepackages() incorrectly claims that PYTHONNOUSERSITE is respected

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 1006f63a8b4327e8a74eb978b175b5234bb46c6c by Miss Skeleton (bot) 
in branch '3.8':
bpo-41376: Fix the documentation of `site.getusersitepackages()` (GH-21602) 
(GH-22592)
https://github.com/python/cpython/commit/1006f63a8b4327e8a74eb978b175b5234bb46c6c


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[issue26964] Incorrect documentation for `-u`-flag

[Irit Katriel]

Irit Katriel  added the comment:

I think this issue is out of date (the offending sentence is no longer there).

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[issue42007] Line continuation after Boolean operation

[veganaiZe]

veganaiZe  added the comment:

Actually, I can do it the second way.  I must have typo'd when testing (my 
apologies)...  But I'd still like to do it the first way. ☺

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[issue42007] Line continuation after Boolean operation

[veganaiZe]

New submission from veganaiZe :

I can't do something like this (regarding the `or`)...

if (not position.x == 0 and velocity == -1) or
(not position.x == 500 and velocity == 1)

Nor this...

if (not position.x == 0 and velocity == -1) or (
not position.x == 500 and velocity == 1)

I have to do something like this...

if (not position.x == 0 and velocity == -1) \
   or (not position.x == 500 and velocity == 1)

I would like to be able to do it the first way.

--
components: Interpreter Core
messages: 378441
nosy: veganaiZe
priority: normal
severity: normal
status: open
title: Line continuation after Boolean operation
type: enhancement
versions: Python 3.7

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[issue41561] test_ssl fails in Ubuntu 20.04: test_min_max_version_mismatch

[Bug Reporter]

Bug Reporter  added the comment:

I started by asking a question at 
https://askubuntu.com/questions/1281942/pythons-test-ssl-fails-starting-from-ubuntu-20-04-i-need-to-find-a-person-at-c

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[issue41993] Possible issues when remove not completely initialized module from sys.module

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue41993] Possible issues when remove not completely initialized module from sys.module

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue38250] enum.Flag should be more set-like

[Vedran Čačić]

Vedran Čačić  added the comment:

Just a comment, (1) is analogous to str. iter('abc') gives only 'a', 'b' and 
'c', while contains accepts '', 'ab', 'bc', and 'abc' too. At least in my mind, 
it's a pretty strong analogy.

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[issue42006] Stop using PyDict_GetItem, PyDict_GetItemString and _PyDict_GetItemId

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
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[issue41971] multiple tests in test_tools fail since Python 3.9

[Chih-Hsuan Yen]

Chih-Hsuan Yen  added the comment:

Looks like those failures in test_tools happen only when test_check_c_globals 
is imported and a test in test_imp is run.

```
$ cat matchfile
test.test_tools.*
test.test_imp.ImportTests.test_load_from_source

$ ./python -m test --matchfile matchfile test_check_c_globals test_imp 
test_tools
0:00:00 load avg: 0.90 Run tests sequentially
0:00:00 load avg: 0.90 [1/3] test_check_c_globals
0:00:00 load avg: 0.90 [2/3] test_imp -- test_check_c_globals run no tests
0:00:00 load avg: 0.90 [3/3] test_tools
test test_tools failed -- multiple errors occurred; run in verbose mode for 
details
test_tools failed

== Tests result: FAILURE ==

1 test OK.

1 test failed:
test_tools

1 test run no tests:
test_check_c_globals

Total duration: 1.9 sec
Tests result: FAILURE
```

If I remove test_check_c_globals from the second command or 
test.test_imp.ImportTests.test_load_from_source from matchfile, test_tools does 
not fail.

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[issue42006] Stop using PyDict_GetItem, PyDict_GetItemString and _PyDict_GetItemId

[Serhiy Storchaka]

New submission from Serhiy Storchaka :

There are design flaws in PyDict_GetItem(), PyDict_GetItemString() and 
_PyDict_GetItemId().

1. They suppress all exceptions raised internally. Most common of are 
MemoryError, KeyboardInterrupt and RecursionError whose raising is out of 
control of the programmer. When an exception is suppressed the function returns 
incorrect result. For example PyDict_GetItem() can return NULL for existing key 
if the user press Ctrl-C.

This situation seems impossible if the key and all keys in the dict are exact 
strings, but we cannot be sure.

2. PyDict_GetItem() preserves the current exception, and therefore can be used 
in handling exception but PyDict_GetItemString() and _PyDict_GetItemId() clear 
it if the creation of string object is failed (due to MemoryError or, less 
likely, UnicodeDecodeError). It can leads to very unexpected result.

Most of uses of PyDict_GetItem() etc were fixed in issue35459 and other issues. 
But some occurrences were left, in cases when there is no any error handling, 
either errors are not expected or all exceptions are suppressed in any case. It 
is mainly in the compiler and symtable (where we look up in just created 
dicts), in structseq.c and in the sys module.

The proposed PR (it can be split on several smaller PRs if needed, see also 
issue41993 and issue42002) removes all calls of PyDict_GetItem, 
PyDict_GetItemString and _PyDict_GetItemId, replacing them with calls of 
PyDict_GetItemWithError, _PyDict_GetItemStringWithError and 
_PyDict_GetItemIdWithError or other functions if appropriate.

_PyDict_GetItemId is no longer used and can be removed.

--
components: Extension Modules, Interpreter Core
messages: 378437
nosy: serhiy.storchaka, vstinner
priority: normal
severity: normal
status: open
title: Stop using PyDict_GetItem, PyDict_GetItemString and _PyDict_GetItemId
versions: Python 3.10

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[issue38250] enum.Flag should be more set-like

[John Belmonte]

John Belmonte  added the comment:

Part of this issue (#1) was intended to be addressed by 
https://github.com/python/cpython/pull/1 which added an `__iter__` 
implementation to Flag and IntFlag.  (The PR did not reference this issue, and 
was already merged last month.)

However that PR seems problematic on several counts:
   1. `__iter__` diverges from the existing `__contains__`.  The latter 
includes 0 and compound values
   2. the implementation is fairly heavy
   3. len() on an enum instance is going to be O(n)

I've put post-merge comments on the PR.

I think it would be safer to have an explicitly named `bits()` iterator on flag 
instances, rather than use `__iter__()`.

--
keywords: +patch
message_count: 3.0 -> 4.0
pull_requests: +21621
stage:  -> patch review
versions: +Python 3.10 -Python 3.9
pull_request: https://github.com/python/cpython/pull/1

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[issue42002] Clean up initialization of the sys module

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue41993] Possible issues when remove not completely initialized module from sys.module

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 4.0 -> 5.0
pull_requests: +21620
pull_request: https://github.com/python/cpython/pull/22647

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[issue41968] 3.9 IDLE documentation.

[E. Paine]

E. Paine  added the comment:

If you had a bad update, it is likely your registry is corrupt. If at all 
possible, I would recommend a Windows reinstall (it is quite likely other 
software has also been affected). However, in the past I have had similar 
problems and the Python installer does seem particularly susceptible to 
problems if corruption occurs (I resolved this without a Windows reinstall by 
uninstalling Python then deleting all registry entries related to it - though I 
would not recommend this more generally). I may take this up with Steve (in a 
separate issue) to see if we can make the installer more resilient.

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[issue41993] Possible issues when remove not completely initialized module from sys.module

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset 8287aadb75f6bd0154996424819334cd3839707c by Serhiy Storchaka in 
branch 'master':
bpo-41993: Fix possible issues in remove_module() (GH-22631)
https://github.com/python/cpython/commit/8287aadb75f6bd0154996424819334cd3839707c


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[issue41940] AMD64 Debian root 3.x: tests fail because downloaded files start with:

[STINNER Victor]

STINNER Victor  added the comment:

If someone wants to use HTTPS on pythontest.net, please open a new issue. I 
don't recall who operates this service. Ask Ernest or Benjamin maybe? See 
https://github.com/python/pythontestdotnet/ project. https://pythontest.net/ 
has an invalid certificate. Ernest might be able to set up a valid certificate.

For buildbot failures, I prefer to be able to close issues as soon as possible, 
since I manage tons of buildbot failures. Otherwise, I'm quickly overwhelmed.

The initial issue "AMD64 Debian root 3.x fails" is fixed ;-)

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[issue41756] Do not always use exceptions to return result from coroutine

[Mark Shannon]

Mark Shannon  added the comment:

What's the difference between removing it and making it properly private (i.e. 
static)?

It's an irrelevant detail whether the code is inlined or in a helper function.

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[issue41940] AMD64 Debian root 3.x: tests fail because downloaded files start with:

[Chris Angelico]

Chris Angelico  added the comment:

That ducks the immediate issue, but I think the underlying issue would still be 
worth solving. How hard would it be to fetch this via an encrypted connection? 
It's still not 100% secure, but it would be resilient against some of these 
sorts of issues.

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[issue42002] Clean up initialization of the sys module

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset fa1d83db62a545580d9a1a585b2c1fb55961a5c3 by Serhiy Storchaka in 
branch 'master':
bpo-42002: Clean up initialization of the sys module. (GH-22642)
https://github.com/python/cpython/commit/fa1d83db62a545580d9a1a585b2c1fb55961a5c3


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[issue41991] Remove _PyObject_HasAttrId

[STINNER Victor]

STINNER Victor  added the comment:

Remark: the issue that you give in this issue is helpful. Next time, you may 
include such rationale directly in the commit message. IMO the Linux kernel is 
a great example on how commit message should be written: long commit message 
with tons of information, you don't need to go to an online website (like 
bugs.python.org) to get more context / the rationale.

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[issue34067] Problem with contextlib.nullcontext

[STINNER Victor]

Change by STINNER Victor :


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[issue41940] AMD64 Debian root 3.x: tests fail because downloaded files start with:

[STINNER Victor]

STINNER Victor  added the comment:

Yeah, it seems like Chris's Internet issues are gone ;-)

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[issue41981] Errors building python 3.9.0 from source on Centos 7 with GCC 10

[STINNER Victor]

STINNER Victor  added the comment:

> In "config.log" you can see that "/bin/ld" did not found "-lpanelw".

Yep, that's what I wrote in my previous message :-)

I understand that you solved your issue, so I close this issue.

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[issue41845] Promote PyObject_GenericGetDict to the stable API

[Zackery Spytz]

Zackery Spytz  added the comment:

I have created PR 22646 to fix this issue.  Please consider taking a look.

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[issue41845] Promote PyObject_GenericGetDict to the stable API

[Zackery Spytz]

Change by Zackery Spytz :


--
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nosy: +ZackerySpytz
nosy_count: 4.0 -> 5.0
pull_requests: +21619
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22646

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[issue41756] Do not always use exceptions to return result from coroutine

[Stefan Behnel]

Stefan Behnel  added the comment:

> Don't forget to remove PyGen_Send()

That's the function that allows sending data into a generator. It's also used 
internally by "PyIter_Send()". Are you really suggesting to remove it, or to 
make it underscore-private again? (As it was before.)

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[issue42004] Allow uploading files with SimpleHTTPRequestHandler

[Jürgen Gmach]

Jürgen Gmach  added the comment:

There is PEP 594 (draft), which - when accepted - will remove cgi.FieldStorage

https://www.python.org/dev/peps/pep-0594/

https://discuss.python.org/t/pep-594-removing-dead-batteries-from-the-standard-library/1704

This comes from an idea to relief the burden of maintenance for the maintainers.



Some off-topic comments...

cgi.FieldStorage has quite some unresolved issues, partially open for many 
years, although there are also some pull requests, waiting for review.

While cgi.FieldStorage is certainly a niche thing, it is used by Zope, by 
Plone, by webob... 

The latter even has a 250 line compat module to accomodate for current bugs ( 
https://github.com/Pylons/webob/blob/5c062aef9397b27915c5cc2ed2f202bff7494eca/src/webob/compat.py
 ).

If you, Javier, are also a fan of cgi.FieldStorage want to improve the 
situation with cgi.FieldStorage, maybe you could help reviewing the open issues 
and the open pull requests for cpython?

--
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[issue41971] multiple tests in test_tools fail since Python 3.9

[Chih-Hsuan Yen]

Change by Chih-Hsuan Yen :


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[issue41972] bytes.find consistently hangs in a particular scenario

[Dennis Sweeney]

Dennis Sweeney  added the comment:

> Offhand do you know what the _best_ timing for two-way search is in a 
> pattern-not-found case?

Looking at the glibc implementation, in the top-level "else" clause
(for when the string isn't completely periodic),
we have:

period = MAX (suffix, needle_len - suffix) + 1;

so period > needle_len / 2.

Then during each iteration of the j-loop (where j is the index into the 
haystack),
j is sometimes incremented by `period`, which would probably give O(n/m) best 
case.

Here's a sublinear example for the two-way algorithm:

N = 10**7
haystack = "ABC" * N
needle1 = "ABC" * (N // 10) + "DDD"
needle2 = "ABC" * 10 + "DDD"

=== Results ===
Pure Python Two-Way, shorter needle: 1.7142754
Pure Python Two-Way. Longer needle:  0.00188450667
Python builtin, shorter needle:  0.0310714082
Python builtin, longer needle:   0.0305660707

This case is surprisingly better than the builtin:

N = 10**7
haystack = "ABC" * N
needle1 = "DDD" + "ABC" * (N // 10)
needle2 = "DDD" + "ABC" * 10

=== Results ===
Pure Python Two-Way, shorter needle: 0.00208950774
Pure Python Two-Way. Longer needle:  0.00178789534
Python builtin, shorter needle:  0.0299981028
Python builtin, longer needle:   0.029634395

This was measured using the attached fastsearch.py. There are some 
manipulations in there like string slicing that would make more sense as 
pointer math in C, so especially accounting for that, I'm guessing it would be 
pretty competitive in a lot of cases.

A lot of the implementations look like they use a complete Boyer-Moore table to 
go sublinear in even more cases, which it seems we want to avoid. I'm not 
certain, but it's conceivable that the existing techniques of using just one 
one delta-value or the "Bloom filter" could be thrown in there to get some of 
the same improvements. Although that could be redundant -- I'm not sure.

--
Added file: https://bugs.python.org/file49507/fastsearch.py

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[issue42005] profile/cProfile CLI should catch BrokenPipeError

[Ammar Askar]

Ammar Askar  added the comment:

Related:

https://bugs.python.org/issue39828

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