[issue31033] Improve traceback of cancelled tasks / add cancel() msg argument

[Chris Jerdonek]

Chris Jerdonek  added the comment:

Thanks so much, Yury.

(Removing the "release blocker" flag now that it has been merged.)

--
priority: release blocker -> normal
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
title: Add argument to .cancel() of Task and Future -> Improve traceback of 
cancelled tasks / add cancel() msg argument

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[issue31033] Add argument to .cancel() of Task and Future

[Chris Jerdonek]

Chris Jerdonek  added the comment:


New changeset da742ba826721da84140abc785856d4ccc2d787f by Chris Jerdonek in 
branch 'master':
bpo-31033: Improve the traceback for cancelled asyncio tasks (GH-19951)
https://github.com/python/cpython/commit/da742ba826721da84140abc785856d4ccc2d787f


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[issue22622] ElementTree only writes declaration when passed encoding

[Zackery Spytz]

Zackery Spytz  added the comment:

Python 2 is EOL, so I think this issue should be closed.

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[issue13601] sys.stderr should be line-buffered when stderr is not a TTY

[miss-islington]

miss-islington  added the comment:


New changeset d17f3d8315a3a775ab0807fc80acf92b1bd682f8 by Shantanu in branch 
'master':
bpo-13601: Mention stderr's line buffering in What's New (GH-20168)
https://github.com/python/cpython/commit/d17f3d8315a3a775ab0807fc80acf92b1bd682f8


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[issue13601] sys.stderr should be line-buffered when stderr is not a TTY

[Shantanu]

Change by Shantanu :


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pull_request: https://github.com/python/cpython/pull/20168

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[issue40661] The new parser segfaults when parsing invalid input

[Guido van Rossum]

Guido van Rossum  added the comment:

Zac: The reproducer here apparently uses a long string of weird accented 
characters. I'm not sure how to generalize from that to other things that 
Hyothes* could find. But maybe this helps: 
https://github.com/python/cpython/pull/20106#issuecomment-629742075

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[issue40629] Error MSB4086 (numeric comparison)

[veganaiZe]

veganaiZe  added the comment:

Probably a result of pulling in `msbuild` from .net 4.0 tools.

I'm setting up a dedicated virtual machine.

--
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status: open -> closed

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[issue19956] inspect.getsource(obj.foo) fails when foo is an injected method constructed from another method

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Here is minimal reproducing code.

import types
import inspect

class A:
def say(self): print("A.say")
a = A()

class B: pass
b = B()
b.say = types.MethodType(a.say, b)

Let us examine MethodType first.  Calling 'b.say()' asks the previously 
neglected question: Is b.say a proper, sane callable?  I claim not. With 
3.9.0a6, the call fails with "TypeError: say() takes 1 positional argument but 
2 were given".  b.say() calls a.say(b), which calls A.say(a, b).  If A.say took 
another parameter, such as 'name', 'b.say()' might work, but only by accident.

Here is another buggy use of MethodType, 
b.A = types.MethodType(A, b)
b.A()
# TypeError: A() takes no arguments
Again, given 'def __init__(self, something)', b.A() might work, but only by 
accident.

types.MethodType is an example of "[This module] defines names for some object 
types that are used by the standard Python interpreter, but not exposed as 
builtins like int or str are."  The names are mainly intended to be used for 
isinstance checks and rarely, if at all, for object creation.

The MethodType entry lack a signature and only says "The type of methods of 
user-defined class instances."  Its docstring, "method(function, 
instance)\n\nCreate a bound instance method object." does have a signature.  
However, 'function' must be a function compatible with being passed 'instance' 
as the first argument.  This is false for both A and a.say; both result in 
buggy 'callables'.

MethodType checks that its first argument, assigned to the .__func__ attribute, 
is callable (has a '.__call__' attribute) but apparently does not check further.

As for getsource.  For b.A and b.say, it raises "TypeError: module, class, 
method, function, traceback, frame, or code object was expected, got {type}", 
where type is 'type' and 'method' respectively.  For both, the message is 
slightly confusing in that the function got something on the list (type=class). 
 For both, getsource could be patched to work with the buggy inputs.  I the 
latter is a bad idea.  Built-in functions usually fail with buggy inputs.  We 
should either improve the error message for methods or just close this.

--
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[issue31033] Add argument to .cancel() of Task and Future

[Yury Selivanov]

Yury Selivanov  added the comment:

Elevating to release blocker to make sure it's included. The PR is good.

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[issue31033] Add argument to .cancel() of Task and Future

[Yury Selivanov]

Change by Yury Selivanov :


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[issue40633] json.dumps() should encode float number NaN to null

[Raymond Hettinger]

Raymond Hettinger  added the comment:

We could add an option to cause NaNs to raise an error, but I don't think it 
would get used.

Otherwise, it's likely best to leave the module as-is.

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[issue40651] class:`OrderedDict` Examples: LRU implementation has a bug.

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Thanks for PR :-)

--
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stage: patch review -> resolved
status: open -> closed
versions: +Python 3.8, Python 3.9

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[issue40651] class:`OrderedDict` Examples: LRU implementation has a bug.

[miss-islington]

Change by miss-islington :


--
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pull_requests: +19466
pull_request: https://github.com/python/cpython/pull/20167

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[issue40651] class:`OrderedDict` Examples: LRU implementation has a bug.

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset bb8635cc3bc3dd65996803849ee1a91cfbebae9c by qudongfang in branch 
'master':
bpo-40651: Improve LRU recipe in the OrderedDict documentation  (GH-#20139)
https://github.com/python/cpython/commit/bb8635cc3bc3dd65996803849ee1a91cfbebae9c


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[issue4264] Patch: optimize code to use LIST_APPEND instead of calling list.append

[Raymond Hettinger]

Raymond Hettinger  added the comment:

The advent of the LOAD_METHOD opcode addresses this issue.

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

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[issue40665] Use Argument Clinic for bisect

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Thanks for the PR :-)

--
assignee:  -> rhettinger
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
type:  -> enhancement
versions: +Python 3.9

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[issue40665] Use Argument Clinic for bisect

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset 3a855b26aed02abf87fc1163ad0d564dc3da1ea3 by Shantanu in branch 
'master':
bpo-40665: Use Argument Clinic for the bisect module (GH-20163)
https://github.com/python/cpython/commit/3a855b26aed02abf87fc1163ad0d564dc3da1ea3


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[issue40334] PEP 617: new PEG-based parser

[Raymond Hettinger]

Raymond Hettinger  added the comment:

One minor nit:  We're getting a nuisance compiler warning:

test_peg_generator passed (2 min 40 sec)
/var/folders/1b/3499qp8s7xv5w0fvjcgl4510gn/T/tmp90rifd5z/parse.c:97:19: 
warning: code will never be executed [-Wunreachable-code]
p->mark = _mark;
  ^
1 warning generated.

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[issue40452] IDLE: preserve clipboard on closure on Windows

[Terry J. Reedy]

Terry J. Reedy  added the comment:

eryksun, Piping to clip.exe is not working well.  On the patch, I asked if you 
know what Windows system call it uses, but I cannot request your review there.

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[issue40661] The new parser segfaults when parsing invalid input

[Zac Hatfield-Dodds]

Zac Hatfield-Dodds  added the comment:

I understand from Paul Ganssle that this bug was found using Hypothesmith in my 
stdlib property tests (reported at 
https://github.com/Zac-HD/stdlib-property-tests/issues/14).

As discussed in https://github.com/we-like-parsers/cpython/issues/91 and 
https://pyfound.blogspot.com/2020/05/property-based-testing-for-python.html I'm 
keen to help out how I can, so if there's anything more specific than "write 
tools, write test, and wait" please let me know!

Best,
Zac

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[issue39076] Use types.SimpleNamespace for argparse.Namespace

[Raymond Hettinger]

Change by Raymond Hettinger :


--
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status: open -> closed

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[issue40536] Addition of a "list of available time zones" function to zoneinfo

[Paul Ganssle]

Paul Ganssle  added the comment:

I've merged the existing implementation, but I'm leaving this staged as 
"release blocker" so that Łukasz can have final say on whether this goes into 
3.9.

Thanks for the help everyone!

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[issue40536] Addition of a "list of available time zones" function to zoneinfo

[Paul Ganssle]

Paul Ganssle  added the comment:


New changeset e527ec8abe0849e784ce100f53c2736986b670ae by Paul Ganssle in 
branch 'master':
bpo-40536: Add zoneinfo.available_timezones (GH-20158)
https://github.com/python/cpython/commit/e527ec8abe0849e784ce100f53c2736986b670ae


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[issue39173] _AttributeHolder of argparse should support the sort function or not?

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Am marking this as closed, out-of-date.

If needed, feel free to re-open.

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[issue39058] argparse should preserve argument ordering in Namespace

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset 9681953c99b686cf23d1c476a2b26d2ddbec7694 by Raymond Hettinger in 
branch 'master':
bpo-39058:  Preserve attribute order in argparse Namespace reprs. (GH-17621)
https://github.com/python/cpython/commit/9681953c99b686cf23d1c476a2b26d2ddbec7694


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[issue39058] argparse should preserve argument ordering in Namespace

[Raymond Hettinger]

Change by Raymond Hettinger :


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status: open -> closed

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[issue13601] sys.stderr should be line-buffered when stderr is not a TTY

[Guido van Rossum]

Guido van Rossum  added the comment:

Can you submit a PR and CC me?

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[issue39705] Tutorial, 5.6 Looping Techniques, sorted() example

[Raymond Hettinger]

Change by Raymond Hettinger :


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status: open -> closed

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[issue39705] Tutorial, 5.6 Looping Techniques, sorted() example

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset eefd4e04a2a1d3929d0f7978469e5b5c4e56 by Rahul Kumaresan in 
branch 'master':
bpo-39705 : sorted() tutorial example under looping techniques improved 
(GH-18999)
https://github.com/python/cpython/commit/eefd4e04a2a1d3929d0f7978469e5b5c4e56


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[issue39801] list.insert is slow, likely due to manual memmove

[Raymond Hettinger]

Change by Raymond Hettinger :


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[issue40597] generated email message exceeds RFC-mandated limit of 998 characters

[R. David Murray]

Change by R. David Murray :


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[issue40597] generated email message exceeds RFC-mandated limit of 998 characters

[R. David Murray]

R. David Murray  added the comment:


New changeset c1f1ddf30a595c2bfa3c06e54fb03fa212cd28b5 by Miss Islington (bot) 
in branch '3.8':
bpo-40597: email: Use CTE if lines are longer than max_line_length consistently 
(gh-20038) (gh-20084)
https://github.com/python/cpython/commit/c1f1ddf30a595c2bfa3c06e54fb03fa212cd28b5


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[issue38870] Expose ast.unparse in the ast module

[1v3m]

Change by 1v3m :


--
nosy: +1v3m
nosy_count: 7.0 -> 8.0
pull_requests: +19465
pull_request: https://github.com/python/cpython/pull/20166

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[issue40612] Make traceback module's formatting of SyntaxError more similar to system formatting

[Guido van Rossum]

Change by Guido van Rossum :


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status: open -> closed

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[issue40452] IDLE: preserve clipboard on closure on Windows

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Now that I think about it, I have run into enough problems with ^V not pasting 
something copied with ^C that I always leave source windows open until 
successful.  I had not noticed that there is only a problem between windows 
(but this may be true) or after closing IDLE or that it only occurs when 
copying *from* IDLE.  In fact, the last might not be true if other apps have 
the same bug.  (I will start paying more attention after this is fixed.)

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[issue40662] ast.get_source_segment behaviour with missing location info doesn't match docstring

[Shantanu]

Shantanu  added the comment:

The code works on 3.8 for me, but has regressed on 3.9 master. Looks like this 
is caused by https://bugs.python.org/issue36287 
(https://github.com/python/cpython/pull/18843)

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[issue40661] The new parser segfaults when parsing invalid input

[Lysandros Nikolaou]

Change by Lysandros Nikolaou :


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[issue40431] turtledemo/__main__.py: SyntaxError: invalid string prefix else"#fca"

[Terry J. Reedy]

Terry J. Reedy  added the comment:

I believe the file was synchronized across versions as new features have not 
recently been added. Backporting the fix to my typo should keep it that way.  
This is an example of why code review even of patches that 'work' is a good 
thing.

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[issue40665] Use Argument Clinic for bisect

[Shantanu]

Change by Shantanu :


--
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pull_requests: +19463
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20163

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[issue40665] Use Argument Clinic for bisect

[Shantanu]

New submission from Shantanu :

As the title says! Am submitting a PR.

--
components: Argument Clinic
messages: 369153
nosy: hauntsaninja, larry
priority: normal
severity: normal
status: open
title: Use Argument Clinic for bisect

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[issue40257] Improve the use of __doc__ in pydoc

[Thomas Caswell]

Change by Thomas Caswell :


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[issue34431] Docs does not eval allows code object as argument

[Furkan Onder]

Furkan Onder  added the comment:

Hi Jonathan,
Are you still planning to work on the patch?

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[issue40664] Documentation error: itertools.dropwhile(is_even, itertools.count()) output

[SilentGhost]

SilentGhost  added the comment:

Did you try running that? The documentation is correct, dropwhile works 
differently than filter.

--
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stage:  -> resolved
status: open -> closed
type:  -> behavior

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[issue39533] Use `statx(2)` system call on Linux for extended `os.stat` information

[Christian Heimes]

Christian Heimes  added the comment:

You can find an example in Python/bootstrap_hash.c that deals with getrandom 
syscall.

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[issue37496] Support annotations in signature strings.

[Filipe Laíns]

Change by Filipe Laíns :


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nosy: +FFY00

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[issue39533] Use `statx(2)` system call on Linux for extended `os.stat` information

[ntninja]

ntninja  added the comment:

I thought this might be the case, I'll look into adapting the patch accordingly 
then.

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[issue40536] Addition of a "list of available time zones" function to zoneinfo

[Filipe Laíns]

Change by Filipe Laíns :


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[issue40536] Addition of a "list of available time zones" function to zoneinfo

[gaborbernat]

gaborbernat  added the comment:

I think semantically the correct expression would be available timezones, free 
function, set and no cache. Document the operation is expensive and users 
should cache if they want repeated access or provide an available timezones 
cached function  my 2c

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[issue40664] Documentation error: itertools.dropwhile(is_even, itertools.count()) output

[Nicolas Gimenez]

Nicolas Gimenez  added the comment:

Relase: 0.32
Lang: English
Python version: 3.8.3

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[issue40664] Documentation error: itertools.dropwhile(is_even, itertools.count()) output

[Nicolas Gimenez]

New submission from Nicolas Gimenez :

On this page:
https://docs.python.org/3/howto/functional.html
The example:

"itertools.dropwhile(is_even, itertools.count()) =>
  1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ..."

is wrong. It should be:

"itertools.dropwhile(is_even, itertools.count()) =>
  1, 3, 5, 7, 9, ..."

--
assignee: docs@python
components: Documentation
messages: 369146
nosy: docs@python, nicobao
priority: normal
severity: normal
status: open
title: Documentation error:  itertools.dropwhile(is_even, itertools.count()) 
output
versions: Python 3.8

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[issue38938] Possible performance improvement for heaqq.merge()

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Am leaning toward the iterative approach in new_merge.py because it most 
directly implements the core concept of storing the data in a binary tree.

Merits: no recursion, no nested generators, avoids the clutter of left-empty 
and right-empty checks, easy to understand, simple and fast loops, all local 
variables or instance variables, no calls to memory allocator after then 
initial tree construction, runs well on PyPy, and easily Cythonized.

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[issue40661] The new parser segfaults when parsing invalid input

[Guido van Rossum]

Change by Guido van Rossum :


--
keywords: +patch
pull_requests: +19462
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/20159

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[issue40661] The new parser segfaults when parsing invalid input

[Guido van Rossum]

Guido van Rossum  added the comment:

I see almost no time difference for 'make time_stdlib': before 3.471, after 
3.451. But I see a serious difference for 'make time_compile': before 3.474, 
after 4.996. That's over 40% slower (on the extreme case, xxl.py).

I'll prepare a PR just in case.

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[issue40536] Addition of a "list of available time zones" function to zoneinfo

[Paul Ganssle]

Paul Ganssle  added the comment:

I've opened a PR adding this feature and tagged this as release blocker, since 
I'd like to make sure this is in the beta if Łukasz does not object.

The concerns about the stability of the function I expressed earlier have not 
changed much, though we did get some feedback from the tz database list that at 
least make me think that the new approach (excluding posix/, right/ and 
posixrules) is *probably* the right way to go.

--
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[issue40536] Addition of a "list of available time zones" function to zoneinfo

[Paul Ganssle]

Change by Paul Ganssle :


--
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pull_request: https://github.com/python/cpython/pull/20158

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[issue40662] ast.get_source_segment behaviour with missing location info doesn't match docstring

[Irit Katriel]

Change by Irit Katriel :


--
keywords: +patch
pull_requests: +19460
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20157

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[issue40661] The new parser segfaults when parsing invalid input

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

A quick benchmark using xxl.py:

Base time (master):
Time: 9.386 seconds on an average of 20 runs

With the patch in this issue:
Time: 9.498 seconds on an average of 20 runs

Sadly I could not test with PGO/LTO and without CPU isolation, so it would be 
great if someone could double-check these numbers.

Also, I will be unable to do a PR until this night/tomorrow morning (London 
time) :(

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[issue40662] ast.get_source_segment behaviour with missing location info doesn't match docstring

[Irit Katriel]

Change by Irit Katriel :


--
title: ast.get_source_segment behaviour with missing location info doesn't 
match doctoring -> ast.get_source_segment behaviour with missing location info 
doesn't match docstring

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[issue40663] Wrong generated annotation on subscripting

[Batuhan Taskaya]

Change by Batuhan Taskaya :


--
components: +Interpreter Core
type:  -> behavior
versions: +Python 3.7, Python 3.8, Python 3.9

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[issue40663] Wrong generated annotation on subscripting

[Batuhan Taskaya]

Batuhan Taskaya  added the comment:

$ python3.8
Python 3.8.0+ (heads/3.8:b9e5547f58, Nov 28 2019, 19:18:03) 
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from __future__ import annotations
>>> b: Type[(int, str, *types)]
>>> __annotations__
{'b': 'Type[int, str, *types]'}

 $ python3.7
Python 3.7.5 (default, Apr 19 2020, 20:18:17) 
[GCC 9.2.1 20191008] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from __future__ import annotations
>>> b: Type[(int, str, *types)]
>>> __annotations__
{'b': 'Type[int, str, *types]'}
>>>

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[issue40663] Wrong generated annotation on subscripting

[Batuhan Taskaya]

Change by Batuhan Taskaya :


--
keywords: +patch
pull_requests: +19459
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/20156

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[issue40662] ast.get_source_segment behaviour with missing location info doesn't match doctoring

[Batuhan Taskaya]

Change by Batuhan Taskaya :


--
nosy: +BTaskaya

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[issue40663] Wrong generated annotation on subscripting

[Batuhan Taskaya]

New submission from Batuhan Taskaya :

>>> from __future__ import annotations
>>> a: Type[int, str]
>>> b: Type[(int, str, *types)]
>>> __annotations__
{'a': 'Type[int, str]', 'b': 'Type[int, str, *types]'}
>>> ast.parse(__annotations__["b"])
Traceback (most recent call last):
  File "", line 1, in 
  File "/home/isidentical/cpython/master/Lib/ast.py", line 50, in parse
return compile(source, filename, mode, flags,
  File "", line 1
Type[int, str, *types]
   ^
SyntaxError: invalid syntax

--
messages: 369140
nosy: BTaskaya
priority: normal
severity: normal
status: open
title: Wrong generated annotation on subscripting

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[issue40662] ast.get_source_segment behaviour with missing location info doesn't match doctoring

[Irit Katriel]

New submission from Irit Katriel :

The doctoring says "If some location information (lineno, end_lineno, 
col_offset, or end_col_offset) is missing, return None."

However:

>>> s = "12"
>>> node = ast.parse(s).body[0]
>>> ast.get_source_segment(s, node)
'12'
>>> del node.lineno
>>> ast.get_source_segment(s, node)
>>> node = ast.parse(s).body[0]
>>> del node.end_lineno
>>> ast.get_source_segment(s, node)
Traceback (most recent call last):
  File "", line 1, in 
  File "/Users/iritkatriel/src/cpython/Lib/ast.py", line 336, in 
get_source_segment
end_lineno = node.end_lineno - 1
TypeError: unsupported operand type(s) for -: 'NoneType' and 'int'

In other parts of ast.py there are hasattr checks for lineno/col_offset 
alongside checks for None for end_lineno/end_col_offset. So this difference in 
behaviour of the end_ fields seems intended.

--
components: Library (Lib)
messages: 369139
nosy: benjamin.peterson, brett.cannon, iritkatriel, pablogsal, yselivanov
priority: normal
pull_requests: 19458
severity: normal
status: open
title: ast.get_source_segment behaviour with missing location info doesn't 
match doctoring
type: behavior
versions: Python 3.9

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[issue37630] Investigate replacing SHA3 code with OpenSSL

[Christian Heimes]

Christian Heimes  added the comment:


New changeset 62ecd8a8f908282726d2f019c93efa1cf2e9e784 by Christian Heimes in 
branch 'master':
bpo-37630: Fix spelling shake128 -> shake_128 (GH-20154)
https://github.com/python/cpython/commit/62ecd8a8f908282726d2f019c93efa1cf2e9e784


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[issue40629] Error MSB4086 (numeric comparison)

[veganaiZe]

veganaiZe  added the comment:

Using Windows 10 SDK (from late 2019).  It's essential for the 2015r3 tools 
(since the build tools don't include the standard lib headers! --Gimme a break 
Microsoft!)

Here's the TL;DR from the log:

 2>Building with tools version "4.0".
 2>C:\src\cpython\PCbuild\python.props(111,31): error MSB4086: A numeric 
comparison was attempted on "$([System.Version]::Parse($(_RegistryVersion)))" 
that evaluates to "10.0.18362.0" instead of a number, in condition 
"$([System.Version]::Parse($(_RegistryVersion))) > 
$([System.Version]::Parse($(DefaultWindowsSDKVersion)))". 
[C:\src\cpython\PCbuild\_freeze_importlib.vcxproj]

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[issue40661] The new parser segfaults when parsing invalid input

[Guido van Rossum]

Guido van Rossum  added the comment:

How costly is PyErr_Occurred()? That worries me most, otherwise I’d accept this 
right away.

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[issue40452] IDLE: preserve clipboard on closure on Windows

[E. Paine]

E. Paine  added the comment:

Test example:

1) Open IDLE (shell or editor)
2) Copy some text in the IDLE window
3) Close the IDLE window (instance should end)
4) Paste into application of choice
Without the patch, the clipboard is cleared when the instance ends so nothing 
is pasted. With the patch, the content remains in the clipboard as expected.

Note: This is not a problem if clipboard history is turned on or the content is 
pasted before closure, however the order of events above is fairly common for 
me.


Encoding:

In the latest commit to the pull, I have changed the encoding from UTF-8 to 
UTF-16 and my reasoning is as follows:

1) Most importantly, using UTF-8, characters with a unicode value >=2^8 are 
incorrectly copied as multiple characters. UTF-8 does support these characters 
but uses a different number of bytes per character (which is presumably what is 
causing these issues - for example, "AĀ" is encoded as "\x41\xc4\x80", which 
pastes as "A─Ç") UTF-16, however, correctly works for all characters supported 
by Tcl (see next point).

2) "Strings in Tcl are encoded using 16-bit Unicode characters" 
(https://www.tcl.tk/man/tcl8.2.3/TclCmd/encoding.htm). Therefore, the encoding 
we choose should have at least 16 bits allocated per character (meaning either 
UTF-16 or UTF-32).

3) Windows' "Unicode-enabled functions [...] use UTF-16 (wide character) 
encoding, which is [...] used for native Unicode encoding on Windows operating 
systems" (https://docs.microsoft.com/en-us/windows/win32/intl/unicode). For me, 
this was what decided the new encoding (between the two given in the previous 
point).

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[issue40661] The new parser segfaults when parsing invalid input

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Indeed, that diff solves the problem

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[issue40661] The new parser segfaults when parsing invalid input

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

I think we may need to test for the error indicator (and maybe PyErr_Ocurred 
for safety) before every alternative. Something like:

diff --git a/Tools/peg_generator/pegen/c_generator.py 
b/Tools/peg_generator/pegen/c_generator.py
index 8f9972bb41..61cb694628 100644
--- a/Tools/peg_generator/pegen/c_generator.py
+++ b/Tools/peg_generator/pegen/c_generator.py
@@ -468,10 +468,6 @@ class CParserGenerator(ParserGenerator, GrammarVisitor):
 memoize = self._should_memoize(node)

 with self.indent():
-self.print("if (p->error_indicator) {")
-with self.indent():
-self.print("return NULL;")
-self.print("}")
 self.print(f"{result_type} _res = NULL;")
 if memoize:
 self.print(f"if (_PyPegen_is_memoized(p, {node.name}_type, 
&_res))")
@@ -685,6 +681,12 @@ class CParserGenerator(ParserGenerator, GrammarVisitor):
 def visit_Alt(
 self, node: Alt, is_loop: bool, is_gather: bool, rulename: 
Optional[str]
 ) -> None:
+self.print("if (p->error_indicator == 1 || PyErr_Occurred()) {")
+with self.indent():
+self.print("p->error_indicator = 1;")
+self.print("return NULL;")
+self.print("}")
+
 self.print(f"{{ // {node}")
 with self.indent():
 # Prepare variable declarations for the alternative

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[issue40661] The new parser segfaults when parsing invalid input

[Pablo Galindo Salgado]

New submission from Pablo Galindo Salgado :

The new peg parser segfaults when parsing the attached reproducer.

this is due to the fact that the exception set by `tokenizer_error` is not 
properly propagated.

--
components: Interpreter Core
files: reproducer.py
messages: 369132
nosy: gvanrossum, lys.nikolaou, pablogsal
priority: release blocker
severity: normal
stage: needs patch
status: open
title: The new parser segfaults when parsing invalid input
type: crash
versions: Python 3.9
Added file: https://bugs.python.org/file49169/reproducer.py

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[issue37630] Investigate replacing SHA3 code with OpenSSL

[Christian Heimes]

Change by Christian Heimes :


--
pull_requests: +19457
pull_request: https://github.com/python/cpython/pull/20154

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[issue39533] Use `statx(2)` system call on Linux for extended `os.stat` information

[Christian Heimes]

Christian Heimes  added the comment:

The statx call was introduced by Kernel 4.11 in 2017. Major LTS Linux 
distributions like Debian 9, Ubuntu 16.04, and CentOS 7 use older Kernels like 
Linux 4.9 LTS or 3.10 LTS.

In general we try to support older Kernel ABIs even when Python is compiled on 
a system with more recent ABI. This means you have to perform a runtime feature 
detection and fall back to old stat when the syscall fails.

--
nosy: +christian.heimes

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[issue40334] PEP 617: new PEG-based parser

[Lysandros Nikolaou]

Change by Lysandros Nikolaou :


--
pull_requests: +19456
pull_request: https://github.com/python/cpython/pull/20153

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[issue39959] Bug on multiprocessing.shared_memory

[Rauan Mukhamejanov]

Rauan Mukhamejanov  added the comment:

Not sure about "it can always be accessed and closed/unlinked by any process 
later on", as each process will be spawning its own resource_tracker, using a 
separate pipe. Thus, unregister calls from other processes will not have any 
effect. 

The documentation is indeed unclear that processes must share the 
resource_tracker. Can we introduce a new flag - "persist", that would indicate 
no resource tracking is needed? Registering will only happen if create=True and 
persist=False, meaning the user accepts the creating process must outlive all 
other processes that could connect to the shared memory. If persist=False, the 
user accepts the responsibility for manual cleaning up of the allocated memory. 
This will allow catering to a wider range of use cases, where readers/writer 
processes can exit and re-connect to shared_memory as they see fit.

--
nosy: +rauanargyn

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[issue38870] Expose ast.unparse in the ast module

[Batuhan Taskaya]

Change by Batuhan Taskaya :


--
pull_requests: +19455
pull_request: https://github.com/python/cpython/pull/20152

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[issue40649] [Errno 1]

[Glenn Travis]

Glenn Travis  added the comment:

I think that you are referring to Gatekeeper.  Something that I have run into 
with various applications, such as certain utility files in Ortho4XP and even 
when adding aircraft to X-Plane(some of the developers refuse to become 
approved Apple developers).

--
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status: open -> closed

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[issue40643] Improve doc-strings for datetime.strftime & strptime

[Edison Abahurire]

Edison Abahurire  added the comment:

Oh! I realized that statement is there because the strftime method used is 
inherited from the date class.

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[issue40654] shutil.copyfile mutates symlink for absolute path

[Jason R. Coombs]

Jason R. Coombs  added the comment:

I strongly suspect bpo-37834 and GH-15231 is where the difference was 
introduced.

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[issue39533] Use `statx(2)` system call on Linux for extended `os.stat` information

[Pavol Babinčák]

Change by Pavol Babinčák :


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[issue40654] shutil.copyfile mutates symlink for absolute path

[Jason R. Coombs]

Jason R. Coombs  added the comment:

Thank you Eryk for the thorough and informative investigation. Seriously, wow.

> Do you want 3.8 to revert to using the print name, at least for symlinks? 
> (ntpath._readlink_deep would need to be modified to support long target 
> paths.) Or would you rather that shutil used a more reliable way to copy 
> symlinks verbatim on Windows? For example, use CopyFileExW for a file and 
> CreateDirectoryEx for a directory.

In this case, my instinct is that `shutil` should devise a more reliable way to 
copy symlinks. It claims that it does to the extent the platform allows [1].

> symbolic links in the source tree are represented as symbolic links in the 
> new tree and the metadata of the original links will be copied as far as the 
> platform allows

It hadn't occurred to me that the effect may be manifest in readlink, but I see 
that now too:

~ # py -3.7 -c "import os; print(os.readlink('temp/bar'))"
c:\Users\jaraco\temp\foo
~ # py -3.8 -c "import os; print(os.readlink('temp/bar'))"
\\?\c:\Users\jaraco\temp\foo

So even if shutil.copyfile were to copy the symlinks exactly, the expectation 
would still be missed that the output of readlink doesn't match the input to 
symlink, so the expectation would still be missed. A user/programmer should be 
able to predict the output of 'readlink' given the input to 'symlink' (or cmd 
/c mklink).

Based on that reasoning, my answer would be "both", but I'd put a priority on 
restoring the use of "print name" for `readlink`, as that may be sufficient to 
satisfy most (if not all) use-cases.


[1]: https://docs.python.org/3/library/shutil.html#shutil.copytree

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[issue18262] ZipInfo.external_attr are not documented

[Pavol Babinčák]

Pavol Babinčák  added the comment:

I'm interested in this documentation enhancement as well.

Alex, I'm wondering if you could convert your patch to GitHub? [1]


[1] 
https://devguide.python.org/pullrequest/#converting-an-existing-patch-from-b-p-o-to-github

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[issue40649] [Errno 1]

[Rémi Lapeyre]

Rémi Lapeyre  added the comment:

It's because application on recent versions of MacOS cannot access files in 
some directories without being granted permission explicitly, a permission 
model similar to what iOS and Android.

You can grant them additional permission using System Preferences, see 
https://osxdaily.com/2018/10/09/fix-operation-not-permitted-terminal-error-macos/
 for example. All applications on recent version of MacOS behaves like this and 
this is not a bug in Python.

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[issue12800] 'tarfile.StreamError: seeking backwards is not allowed' when extract symlink

[Chris AtLee]

Chris AtLee  added the comment:

It's caused by the combination of the symlink existing, and having the tarfile 
opened in r| mode.

If I run the attached test file in a fresh directory, I get the following 
exception:

raceback (most recent call last):
  File "/home/catlee/.pyenv/versions/3.8.2/lib/python3.8/tarfile.py", line 
2227, in makelink
os.symlink(tarinfo.linkname, targetpath)
FileExistsError: [Errno 17] File exists: 'message.txt' -> './symlink.txt'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "../test.py", line 12, in 
tf.extractall()
  File "/home/catlee/.pyenv/versions/3.8.2/lib/python3.8/tarfile.py", line 
2024, in extractall
self.extract(tarinfo, path, set_attrs=not tarinfo.isdir(),
  File "/home/catlee/.pyenv/versions/3.8.2/lib/python3.8/tarfile.py", line 
2065, in extract
self._extract_member(tarinfo, os.path.join(path, tarinfo.name),
  File "/home/catlee/.pyenv/versions/3.8.2/lib/python3.8/tarfile.py", line 
2145, in _extract_member
self.makelink(tarinfo, targetpath)
  File "/home/catlee/.pyenv/versions/3.8.2/lib/python3.8/tarfile.py", line 
2237, in makelink
self._extract_member(self._find_link_target(tarinfo),
  File "/home/catlee/.pyenv/versions/3.8.2/lib/python3.8/tarfile.py", line 
2137, in _extract_member
self.makefile(tarinfo, targetpath)
  File "/home/catlee/.pyenv/versions/3.8.2/lib/python3.8/tarfile.py", line 
2176, in makefile
source.seek(tarinfo.offset_data)
  File "/home/catlee/.pyenv/versions/3.8.2/lib/python3.8/tarfile.py", line 513, 
in seek
raise StreamError("seeking backwards is not allowed")
tarfile.StreamError: seeking backwards is not allowed

--
Added file: https://bugs.python.org/file49168/test.py

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[issue12800] 'tarfile.StreamError: seeking backwards is not allowed' when extract symlink

[Julien Palard]

Julien Palard  added the comment:

Hi Chris, which exception did you got exactly? Was it caused by the r| mode or 
by a symlink (or file) already existing?

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nosy: +mdk

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[issue40649] [Errno 1]

[Glenn Travis]

Glenn Travis  added the comment:

As per your suggestion I have sent an email to python help, just looking for 
info regarding what you would consider the key permission settings.

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[issue40649] [Errno 1]

[Glenn Travis]

Glenn Travis  added the comment:

ok, fine.
So what permissions would indicate that "the Python interpreter can read it."
The Get Info screenshot that he sent me looks just like mine with regard to 
permissions. The long list in terminal shows nothing special. 

I am not having problems running the scripts.

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[issue4264] Patch: optimize code to use LIST_APPEND instead of calling list.append

[Yonatan Goldschmidt]

Change by Yonatan Goldschmidt :


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nosy: +Yonatan Goldschmidt

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Change by Dennis Sweeney :


Added file: https://bugs.python.org/file49167/losers.py

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Change by Dennis Sweeney :


Removed file: https://bugs.python.org/file49165/losers.py

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[issue25920] PyOS_AfterFork should reset socketmodule's lock

[Ronald Oussoren]

Ronald Oussoren  added the comment:

Technically this would be a functional change, I'd drop this code in  3.9 and 
trunk (although it is awfully close to the expected date for 3.9b1). 

Older versions would keep this code and the bug, that way the older python 
versions can still be used on these ancient OS versions (but users might run 
into this race condition).

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Dennis Sweeney  added the comment:

It seems to me that the code sprawl mostly comes from the separate handling of 
the four keyed/unkeyed and forward/reverse cases, which as far as I can tell 
requires a branch in the innermost loop if not unrolled into separate cases. I 
think recursive_merge.py is about as concise as possible while still 
efficiently handling all four cases.

Is there any issue with recursion in this application? Even if there are 
2**64-1 iterables, this would only mean 64 nested next() calls, which should be 
within the stack on most machines, no?

I did the following benchmark:

py -3.9 -m pyperf timeit -s "from [FILENAME] import merge; from collections 
import deque" "deque(merge(open('english.txt'), open('dutch.txt'), 
open('french.txt'), open('german.txt'), open('italian.txt')), maxlen=0)"

new_merge.py:  Mean +- std dev: 773 ms +- 16 ms
tournament_heap.py:Mean +- std dev: 665 ms +- 42 ms
losers.py: Mean +- std dev: 470 ms +- 31 ms
Existing heapq:Mean +- std dev: 313 ms +- 2 ms
recursive_merge.py:Mean +- std dev: 266 ms +- 3 ms

I can look at some more diverse benchmarks (types, iterable length imbalance, 
lengths of an iterator's win-streak, etc.) soon.

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Change by Dennis Sweeney :


Added file: https://bugs.python.org/file49166/recursive_merge.py

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Change by Dennis Sweeney :


Added file: https://bugs.python.org/file49165/losers.py

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Change by Dennis Sweeney :


Added file: https://bugs.python.org/file49164/tournament_heap.py

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Change by Dennis Sweeney :


Removed file: https://bugs.python.org/file48748/merge_recipe.py

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Change by Dennis Sweeney :


Removed file: https://bugs.python.org/file49156/recursive_merge.py

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[issue38938] Possible performance improvement for heaqq.merge()

[Dennis Sweeney]

Change by Dennis Sweeney :


Removed file: https://bugs.python.org/file48747/iter_merge.py

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[issue40334] PEP 617: new PEG-based parser

[Lysandros Nikolaou]

Change by Lysandros Nikolaou :


--
pull_requests: +19454
pull_request: https://github.com/python/cpython/pull/20151

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[issue40645] Use OpenSSL's HMAC API

[Christian Heimes]

Christian Heimes  added the comment:


New changeset 54f2898fe7e4ca1f239e96284af3cc5b34d2ae02 by Christian Heimes in 
branch 'master':
bpo-40645: Implement HMAC in C (GH-20129)
https://github.com/python/cpython/commit/54f2898fe7e4ca1f239e96284af3cc5b34d2ae02


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