[issue46677] TypedDict docs are incomplete

[Charlie Zhao]

Change by Charlie Zhao :


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[issue46980] ast.FunctionDef cannot find functions under if statement

[Ruishi]

Ruishi  added the comment:

I see. It's my misunderstanding. Thank you for your help!

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Re: How to test input via subprocess.Popen with data from file

[Dieter Maurer]

Loris Bennett wrote at 2022-3-11 07:40 +0100:
> ... I want to test the parsing ...
>Sorry if I was unclear but my question is:
>
>Given that the return value from Popen is a Popen object and given that
>the return value from reading a file is a single string or maybe a list
>of strings, what should the common format for the argument which is
>passed to the actual parsing function be?

What methods (of its input argument) does the parsing use?
If it uses `Popen` methods, then you pass a `POpen` object;
if it uses only (typical) file methods, then you pass a file object;
if it assumes its input to be a (line) interator, you pass
a (line) iterator (such as a "file" object).

I would design the parsing that it makes as few assumptions
about its input as possible -- to ease testing
and increase the chance for reuse.

That said, I would not design it to work with `Popen` objects
but likely to have a line iterator as input.
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Re: How to test input via subprocess.Popen with data from file

[Loris Bennett]

Dieter Maurer  writes:

> Loris Bennett wrote at 2022-3-10 13:16 +0100:
>>I have a command which produces output like the
>>following:
>>
>>  Job ID: 9431211
>>  Cluster: curta
>>  User/Group: build/staff
>>  State: COMPLETED (exit code 0)
>>  Nodes: 1
>>  Cores per node: 8
>>  CPU Utilized: 01:30:53
>>  CPU Efficiency: 83.63% of 01:48:40 core-walltime
>>  Job Wall-clock time: 00:13:35
>>  Memory Utilized: 6.45 GB
>>  Memory Efficiency: 80.68% of 8.00 GB
>>
>>I want to parse this and am using subprocess.Popen and accessing the
>>contents via Popen.stdout.  However, for testing purposes I want to save
>>various possible outputs of the command as text files and use those as
>>inputs.
>
> What do you want to test? the parsing? the "popen" interaction?
> You can separately test both tasks (I, at your place, would do this).

I just want to test the parsing.

> For the parsing test, it is not relevant that the actual text
> comes from an external process. You can directly read it from a file
> or have it in your text.

As mentioned in the original post, for the tests I indeed want to read
the input from files.

> In my view, you do not need a test for the `Popen` interaction:
> if it works once, it will work always.

Sorry if I was unclear but my question is:

Given that the return value from Popen is a Popen object and given that
the return value from reading a file is a single string or maybe a list
of strings, what should the common format for the argument which is
passed to the actual parsing function be?

Cheers,

Loris
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[issue46920] Remove code made dead long ago with #if 0

[Oleg Iarygin]

Change by Oleg Iarygin :


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[issue46920] Remove code made dead long ago with #if 0

[Oleg Iarygin]

Change by Oleg Iarygin :


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[issue46920] Remove code made dead long ago with #if 0

[Oleg Iarygin]

Change by Oleg Iarygin :


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[issue46920] Remove code made dead long ago with #if 0

[Oleg Iarygin]

Change by Oleg Iarygin :


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[issue46761] functools.update_wrapper breaks the signature of functools.partial objects

[Larry Hastings]

Larry Hastings  added the comment:

Nobody I've nosied on this issue recently has expressed any opinion on the 
matter.  I'm gonna try one more person: Graham Dumpleton, the maintainer of 
"wrapt", Python's premier function-wrapping.

Graham, care to express any opinions about this issue?  Can we fix it without 
causing widespread wailing and gnashing of teeth?  Do you think people are 
depending on the current how-can-you-describe-it-as-anything-but-broken 
behavior?

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[issue9182] document “--” as a way to distinguish option w/ narg='+' from positional argument in argparse

[Stanley]

Change by Stanley :


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[issue39829] __len__ called twice in the list() constructor

[Inada Naoki]

Inada Naoki  added the comment:

> Changes compared here: 
> https://github.com/python/cpython/compare/main...thatbirdguythatuknownot:patch-17


Looks good to me. Would you create a pull request?

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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Chris Angelico]

On Fri, 11 Mar 2022 at 16:39, Dan Stromberg  wrote:
> Some folks say the desktop environment matters more than the distribution,
> when choosing what OS to install.

Matters more to the choice? Impossible to say.

Matters more to the UI? Without a doubt.

ChrisA
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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Dan Stromberg]

On Thu, Mar 10, 2022 at 5:04 AM Marco Sulla 
wrote:

> On Thu, 10 Mar 2022 at 04:50, Michael Torrie  wrote:
> >
> > On 3/9/22 13:05, Marco Sulla wrote:
> > > So my laziness pays. I use only LTS distros, and I update only when
> > > there are security updates.
> > > PS: any suggestions for a new LTS distro? My Lubuntu is reaching its
> > > end-of-life. I prefer lightweight debian-like distros.
> >
> > Maybe Debian itself?
>
> I tried Debian on a VM, but I found it too much basical. A little
> example: it does not have the shortcut ctrl+alt+t to open a terminal
> that Ubuntu has. I'm quite sure it's simple to add, but I'm starting
> to be old and lazy...
>
That's an attribute of your desktop environment, not the Linux distribution.

EG: I'm using Debian with Cinnamon, which does support ctrl-alt-t.

Some folks say the desktop environment matters more than the distribution,
when choosing what OS to install.
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[issue46677] TypedDict docs are incomplete

[Charlie Zhao]

Change by Charlie Zhao :


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stage: backport needed -> patch review
pull_request: https://github.com/python/cpython/pull/31808

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[issue46980] ast.FunctionDef cannot find functions under if statement

[Jelle Zijlstra]

Jelle Zijlstra  added the comment:

This is the right place to file an issue.

Your code is incorrect; it will find only top-level functions. Functions within 
an `if` statement will be nested inside an `ast.If` node. To find all functions 
in a file, you'll need to recurse into nested nodes. For example, you could use 
`ast.walk`, an `ast.NodeVisitor`, or manually check for nodes like `ast.If`. 
Which one is best depends on your needs. For example, the first two will also 
find methods in classes. The ast module documentation has more information.

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resolution:  -> not a bug
stage:  -> resolved
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[issue46980] ast.FunctionDef cannot find functions under if statement

[Ruishi]

Ruishi  added the comment:

I'm not sure whether I should file this issue here or on Github and I'm not an 
expert on this so I think I cannot contribute to this but only report to you.

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[issue46980] ast.FunctionDef cannot find functions under if statement

[Ruishi]

New submission from Ruishi :

When I use the Python ast package to get the functions of Python files, I find 
the functions defined in the body of `if` statement cannot be recognized.

Here is my code:
with open(py_file, 'r') as f:
data = f.read()
module = ast.parse(data)
func_def = [node for node in module.body if isinstance(node, 
ast.FunctionDef)]

Here is an example of Python file:
if supports_bytes_environ:
def _check_bytes(value):
if not isinstance(value, bytes):
raise TypeError("bytes expected, not %s" % type(value).__name__)
return value

The function `_check_bytes` is not in `func_def`. I also tested 
`ast.iter_child_nodes(module)` and it also has this issue.

--
components: Parser
messages: 414886
nosy: Ruishi, lys.nikolaou, pablogsal
priority: normal
severity: normal
status: open
title: ast.FunctionDef cannot find functions under if statement
type: enhancement
versions: Python 3.7

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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Chris Angelico]

On Fri, 11 Mar 2022 at 09:51, Cousin Stanley  wrote:
>
> Marco Sulla wrote:
>
> >>
> >> Maybe Debian itself?
> >
> > I tried Debian on a VM, but I found it too much basical. A little
> > example: it does not have the shortcut ctrl+alt+t to open a terminal
> > that Ubuntu has. I'm quite sure it's simple to add, but I'm starting
> > to be old and lazy...
> >
>
>   I use the current stable release of Debian 11.2 Bullseye
>   with the lxqt desktop environment 
>
> [Ctrl]-[Alt]-[T] will open a new qterminal window.
>
>
>   The following will display a list of lxqt packages
>   that are in the repository and available to install 
>
> apt-cache search lxqt | grep ^lxqt
>
Much faster:

apt-cache pkgnames lxqt

(apt-cache search will look for "lxqt" in descriptions too, hence the
need to filter those out - apt-cache pkgnames is used by tab
completion)

ChrisA
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[issue46971] python takes long time when return big data

[Hu Di]

Hu Di <476658...@qq.com> added the comment:

I am currently processing large data, and the time spent by del is 
unacceptable. Is there any way to process del in parallel?

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[issue46881] Statically allocate and initialize the latin1 characters.

[Jelle Zijlstra]

Change by Jelle Zijlstra :


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[issue46892] Async Call-Stack Reconstruction

[Andrew Svetlov]

Andrew Svetlov  added the comment:

> We’d like to merge our implementation into CPython

Could you provide a link first, please?

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[issue46971] python takes long time when return big data

[Hu Di]

Hu Di <476658...@qq.com> added the comment:

thanks for your explaining, by the way, why it costs lots of time when del  
 a large array?

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[issue46896] add support for watching writes to selected dictionaries

[Carl Meyer]

Carl Meyer  added the comment:

I've updated the PR to split `PyDict_EVENT_MODIFIED` into separate 
`PyDict_EVENT_ADDED`, `PyDict_EVENT_MODIFIED`, and `PyDict_EVENT_DELETED` event 
types. This allows callbacks only interested in e.g. added keys (case #2) to 
more easily and cheaply skip uninteresting events.

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[issue46198] Duplicate and unused code in tests

[Alex Waygood]

Change by Alex Waygood :


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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Cousin Stanley]

Marco Sulla wrote:

>>
>> Maybe Debian itself?
> 
> I tried Debian on a VM, but I found it too much basical. A little
> example: it does not have the shortcut ctrl+alt+t to open a terminal
> that Ubuntu has. I'm quite sure it's simple to add, but I'm starting
> to be old and lazy...
> 

  I use the current stable release of Debian 11.2 Bullseye
  with the lxqt desktop environment  

[Ctrl]-[Alt]-[T] will open a new qterminal window.


  The following will display a list of lxqt packages
  that are in the repository and available to install 

apt-cache search lxqt | grep ^lxqt

  
-- 
Stanley C. Kitching
Human Being
Phoenix, Arizona

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[issue43224] Add support for PEP 646

[Matthew Rahtz]

Change by Matthew Rahtz :


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[issue46198] Duplicate and unused code in tests

[Jelle Zijlstra]

Jelle Zijlstra  added the comment:


New changeset 4199b7ffbbaa5fe52a4c85c8672ac6773a75ba8f by Jelle Zijlstra in 
branch '3.10':
[3.10] bpo-46198: rename duplicate tests and remove unused code (GH-30297) 
(GH-31796)
https://github.com/python/cpython/commit/4199b7ffbbaa5fe52a4c85c8672ac6773a75ba8f


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[issue43923] Can't create generic NamedTuple as of py3.9

[Bernie Hackett]

Change by Bernie Hackett :


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[issue46198] Duplicate and unused code in tests

[Jelle Zijlstra]

Jelle Zijlstra  added the comment:


New changeset 4052dd2296da2ff304b1fa787b100befffa1c9ca by Alex Waygood in 
branch 'main':
bpo-46198: Fix `test_asyncio.test_sslproto` (GH-31801)
https://github.com/python/cpython/commit/4052dd2296da2ff304b1fa787b100befffa1c9ca


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[issue46744] installers on ARM64 suggest wrong folders

[Roundup Robot]

Change by Roundup Robot :


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[issue46978] Doc strings for built-in, in-place operators are misleading

[Nicko van Someren]

Change by Nicko van Someren :


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[issue46979] Spam

[Dennis Sweeney]

Change by Dennis Sweeney :


--
components:  -Build
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed
title: Master piece -> Spam
type: security -> 

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[issue46198] Duplicate and unused code in tests

[Jelle Zijlstra]

Jelle Zijlstra  added the comment:


New changeset f7f7838b41d45efa129a61f104136f8e12f3488a by Jelle Zijlstra in 
branch '3.9':
[3.9] bpo-46198: rename duplicate tests and remove unused code (GH-30297) 
(GH-31797)
https://github.com/python/cpython/commit/f7f7838b41d45efa129a61f104136f8e12f3488a


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[issue46198] Duplicate and unused code in tests

[Alex Waygood]

Change by Alex Waygood :


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[issue46979] Master piece

[Bankole Jesutofunmi]

New submission from Bankole Jesutofunmi :

Protection

--
components: Build, Demos and Tools
messages: 414878
nosy: Banky_1104, teoliphant
priority: normal
severity: normal
status: open
title: Master piece
type: security
versions: Python 3.10

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[issue46896] add support for watching writes to selected dictionaries

[Carl Meyer]

Carl Meyer  added the comment:

Thanks for outlining the use cases. They make sense.

The current PR provides a flexible generic API that fully supports all three of 
those use cases (use cases 2 and 3 are strict subsets of use case 1.) Since the 
callback is called before the dict is modified, all the necessary information 
is available to the callback to decide whether the event is interesting to it 
or not.

The question is how much of the bookkeeping to classify events as "interesting" 
or "uninteresting" should be embedded in the core dispatch vs being handled by 
the callback.

One reason to prefer keeping this logic in the callback is that with 
potentially multiple chained callbacks in play, the filtering logic must always 
exist in the callback, regardless. E.g. if callback A wants to watch only 
keys-version changes to dict X, but callback B wants to watch all changes to 
it, events will fire for all changes, and callback A must still disregard 
"uninteresting" events that it may receive (just like it may receive events for 
dicts it never asked to watch at all.) So providing API for different "levels" 
of watching means that the "is this event interesting to me" predicate must 
effectively be duplicated both in the callback and in the watch level chosen.

The proposed rationale for this complexity and duplication is the idea that 
filtering out uninteresting events at dispatch will provide better performance. 
But this is hypothetical: it assumes the existence of perf-bottleneck code 
paths that repeatedly rebind globals. The only benchmark workload with this 
characteristic that I know of is pystone, and it is not even part of the 
pyperformance suite, I think precisely because it is not representative of 
real-world code patterns. And even assuming that we do need to optimize for 
such code, it's also not obvious that it will be noticeably cheaper in practice 
to filter on the dispatch side.

It may be more useful to focus on API. If we get the API right, internal 
implementation details can always be adjusted in future if a different 
implementation can be shown to be noticeably faster for relevant use cases. And 
if we get existing API right, we can always add new API if we have to. I don't 
think anything about the proposed simple API precludes adding 
`PyDict_WatchKeys` as an additional feature, if it turns out to be necessary.

One modification to the simple proposed API that should improve the performance 
(and ease of implementation) of use case #2 would be to split the current 
`PyDict_EVENT_MODIFIED` into two separate event types: `PyDict_EVENT_MODIFIED` 
and `PyDict_EVENT_NEW_KEY`. Then the callback-side event filtering for use case 
#2 would just be `event == PyDict_EVENT_NEW_KEY` instead of requiring a lookup 
into the dict to see whether the key was previously set or not.

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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Michael Torrie]

On 3/10/22 12:42, Marco Sulla wrote:
> PS: Is it just my impression or is there a plebiscite for Debian?

A vote?  No I don't think so.  Not sure what you mean.  The reason we're
all suggesting Debian is because you specifically said you want a LTS
Debian-like distro. Can't get any more Debian-like than Debian!  Debian
with XFCE should give you the same experience as Xubuntu, and is always
supported for a very long time.

Personally I run Fedora with Mate or KDE and I upgrade the OS every
12-18 months, usually skipping a version or two.  I did consider Centos
8 stream, but I needed something a little newer for various reasons.

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[issue46581] _typevar_types and _paramspec_tvars are missing from _GenericAlias.copy_with

[Alex Waygood]

Change by Alex Waygood :


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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Marco Sulla]

On Thu, 10 Mar 2022 at 14:13, Jack Dangler  wrote:
> or why not get a cloud desktop running whatever distro you want and you
> don't have to do anything

Three reasons: privacy, speed, price. Not in this order.

On Thu, 10 Mar 2022 at 15:20, Chris Angelico  wrote:
> Very easy. I use Debian with Xfce, and it's an easy thing to add
> shortcuts - even dynamically

I used Xubuntu for a long time. I like Xfce.



On Thu, 10 Mar 2022 at 16:35, Loris Bennett  wrote:
> The shortcuts are properties of the desktop environment.  You could just
> install LXDE/LXQt on Debian if that's what you're used to from Lubuntu.

I tried LXQt on my desktop. Very disappointed. The OS Update interface
is just an "alert". LXDE unluckily is no longer developed.

> Of course, if you're too old and lazy to set up a shortcut, you might
> also be too old and lazy to install a different desktop environment ;-)

Okay, I'm lazy for boring things :D

PS: Is it just my impression or is there a plebiscite for Debian?
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[issue46978] Doc strings for built-in, in-place operators are misleading

[Nicko van Someren]

New submission from Nicko van Someren :

Objects/typeobject.c uses slots to implement various operators and the IBSLOT 
macro is used to define slot entries for in-place binary operators. This macro 
creates a __doc__ string for the operators of the form "Return selfvalue."

This doc string is misleading since an in-place operator statement can not be 
used as an L-value, so nothing is "returned".

To fix this, the macro definition for IBSLOT should be updated to use a 
different word or phrase, such as "Compute selfvalue."

--
components: Interpreter Core
messages: 414876
nosy: nickovs
priority: normal
severity: normal
status: open
title: Doc strings for built-in, in-place operators are misleading
type: behavior
versions: Python 3.10, Python 3.11, Python 3.7, Python 3.8, Python 3.9

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[issue43224] Add support for PEP 646

[Alex Waygood]

Change by Alex Waygood :


--
nosy: +AlexWaygood

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[issue46969] `pip install wrapt` fails on ast.py in Python 3.11.0a6

[Dutcho]

Dutcho  added the comment:

yesterday's `wrapt *1.13.3*` still doesn't work,
but today's `wrapt *1.14.0*` works as expected

So this wasn't about Python 3.11 but about the wrapt version, which used the 
deprecated `formatargspec` from module `inspect`

--
resolution:  -> works for me
stage:  -> resolved
status: open -> closed

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[issue43224] Add support for PEP 646

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
nosy: +serhiy.storchaka
nosy_count: 8.0 -> 9.0
pull_requests: +29901
pull_request: https://github.com/python/cpython/pull/31800

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[issue46976] Update macOS installer builds to use ncurses 6.3

[Ned Deily]

Ned Deily  added the comment:

Assigning to myself as this will require some installer build testing.

--
assignee:  -> ned.deily

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Re: Typing on child class' methods of a Generic base class

[Dieter Maurer]

Nicolas Haller wrote at 2022-3-9 10:53 -0500:
> ...
>The documentation about "user-defined generic types"[1] says that I can
>fix some types on a child class (class MyDict(Mapping[str, T]):) but
>doesn't say much about the signature of the methods I need to
>implement/override on that child class.

I have the fealing that this is a case of (generic type) "specialization".
In this setup, `Mapping` would be a generic type with two type
variables `K` (the key type) and `V` (the value type).
The signatures of its methods would use those type variables.
In your example, you specialize the key type to `str` (and
leave the value type generic). The signatures of the methods
would automatically follow this specialization -- without the need
to do anything.
-- 
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[issue46975] clang: error: linker command failed with exit code 1 (use -v to see invocation) on m1 mac

[Ned Deily]

Ned Deily  added the comment:

Without more details, this is only a guess but the messages seem to indicate 
that your build is detecting an installed version of the GNU gettext library, 
which is optional for Python builds and is not provided by default on macOS, 
and most likely that version is an Intel-only build of the package and its 
libintl shared library. Check whether you have an outdated version of gettext 
and libintl*.dylib installed somewhere, perhaps in /usr/local/, possibly via a 
third-party package manager like Homebrew or MacPorts, and either remove it or 
update it with a arm64 (or universal2 fat) build.

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[issue46913] UBSAN: test_ctypes, test_faulthandler and test_hashlib are failing

[STINNER Victor]

STINNER Victor  added the comment:

The crypt_r() interceptor issue was reported in January 2021 to libasan:
https://github.com/google/sanitizers/issues/1365

> I enabled the test on ASAN on test_crypt and I confirm that I get a crash on 
> calling a NULL function.

Note: I built Python with GCC ASAN (-fsanitize=address).

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[issue46977] tempfile.TemporaryDirectory fails removing dir in some edge cases related to symlinks

[Alexandre Feblot]

Change by Alexandre Feblot :


--
type:  -> crash

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Re: How to test input via subprocess.Popen with data from file

[Dieter Maurer]

Loris Bennett wrote at 2022-3-10 13:16 +0100:
>I have a command which produces output like the
>following:
>
>  Job ID: 9431211
>  Cluster: curta
>  User/Group: build/staff
>  State: COMPLETED (exit code 0)
>  Nodes: 1
>  Cores per node: 8
>  CPU Utilized: 01:30:53
>  CPU Efficiency: 83.63% of 01:48:40 core-walltime
>  Job Wall-clock time: 00:13:35
>  Memory Utilized: 6.45 GB
>  Memory Efficiency: 80.68% of 8.00 GB
>
>I want to parse this and am using subprocess.Popen and accessing the
>contents via Popen.stdout.  However, for testing purposes I want to save
>various possible outputs of the command as text files and use those as
>inputs.

What do you want to test? the parsing? the "popen" interaction?
You can separately test both tasks (I, at your place, would do this).

For the parsing test, it is not relevant that the actual text
comes from an external process. You can directly read it from a file
or have it in your text.

In my view, you do not need a test for the `Popen` interaction:
if it works once, it will work always.
-- 
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[issue46977] tempfile.TemporaryDirectory fails removing dir in some edge cases related to symlinks

[Alexandre Feblot]

New submission from Alexandre Feblot :

```python
#!/usr/bin/env python3

import os
import tempfile

def createUnremovableDir(workdir):
print(workdir)
os.mkdir(f'{workdir}/mydir')
os.symlink('/bin/bash', f'{workdir}/mydir/mylink') # Symlink to a root 
owned file
os.chmod(f'{workdir}/mydir', 0o555)

with tempfile.TemporaryDirectory() as workdir:
createUnremovableDir(workdir)
```

Fails because `tempfile.TemporaryDirectory._rmtree` tries to execute 
os.chmod(path, 0o700) on the symlink, which by default tries to change the root 
owned file symlink target instead of the symlink itself:

```
/tmp/tmp1_dy42ef
Traceback (most recent call last):
  File "/usr/lib/python3.9/shutil.py", line 682, in _rmtree_safe_fd
os.unlink(entry.name, dir_fd=topfd)
PermissionError: [Errno 13] Permission denied: 'mylink'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "~/tempfile_demo_bug.py", line 13, in 
createUnremovableDir(workdir)
  File "/usr/lib/python3.9/tempfile.py", line 969, in __exit__
self.cleanup()
  File "/usr/lib/python3.9/tempfile.py", line 973, in cleanup
self._rmtree(self.name)
  File "/usr/lib/python3.9/tempfile.py", line 955, in _rmtree
_rmtree(name, onerror=onerror)
  File "/usr/lib/python3.9/shutil.py", line 727, in rmtree
_rmtree_safe_fd(fd, path, onerror)
  File "/usr/lib/python3.9/shutil.py", line 664, in _rmtree_safe_fd
_rmtree_safe_fd(dirfd, fullname, onerror)
  File "/usr/lib/python3.9/shutil.py", line 684, in _rmtree_safe_fd
onerror(os.unlink, fullname, sys.exc_info())
  File "/usr/lib/python3.9/tempfile.py", line 941, in onerror
resetperms(path)
  File "/usr/lib/python3.9/tempfile.py", line 936, in resetperms
_os.chmod(path, 0o700)
PermissionError: [Errno 1] Operation not permitted: 
'/tmp/tmp1_dy42ef/mydir/mylink'
```

and leaves:

```
(.venv python 3.9.9) $ find /tmp/tmp1_dy42ef -ls
   148228  4 drwx--   3 myuser myuser 4096 Mar 10 16:54 
/tmp/tmp1_dy42ef
   148229  4 drwx--   2 myuser myuser 4096 Mar 10 16:54 
/tmp/tmp1_dy42ef/mydir
   148230  0 lrwxrwxrwx   1 myuser myuser9 Mar 10 16:54 
/tmp/tmp1_dy42ef/mydir/mylink -> /bin/bash

```

This fixes it:

``` python
#!/usr/bin/env python3

import os
import tempfile

def createUnremovableDir(workdir):
print(workdir)
os.mkdir(f'{workdir}/mydir')
os.symlink('/bin/bash', f'{workdir}/mydir/mylink') # Symlink to a root 
owned file
os.chmod(f'{workdir}/mydir', 0o555)

def _rmtree(cls, name, ignore_errors=False):
def onerror(func, path, exc_info):
if issubclass(exc_info[0], PermissionError):
def resetperms(path):
try:
if os.chflags in os.supports_follow_symlinks:  # This is 
the patch
os.chflags(path, 0, follow_symlinks=False) # This is 
the patch
elif not os.path.islink(path): # This is 
the patch
os.chflags(path, 0)
except AttributeError:
pass
if os.chmod in os.supports_follow_symlinks:# This is 
the patch
os.chmod(path, 0o700, follow_symlinks=False)   # This is 
the patch
elif not os.path.islink(path): # This is 
the patch
os.chmod(path, 0o700)

try:
if path != name:
resetperms(os.path.dirname(path))
resetperms(path)

try:
os.unlink(path)
# PermissionError is raised on FreeBSD for directories
except (IsADirectoryError, PermissionError):
cls._rmtree(path, ignore_errors=ignore_errors)
except FileNotFoundError:
pass
elif issubclass(exc_info[0], FileNotFoundError):
pass
else:
if not ignore_errors:
raise

shutil.rmtree(name, onerror=onerror)

# Monkey patch the class method tempfile.TemporaryDirectory._rmtree
from types import MethodType
import shutil
tempfile.TemporaryDirectory._rmtree = MethodType(_rmtree, 
tempfile.TemporaryDirectory)

with tempfile.TemporaryDirectory() as workdir:
createUnremovableDir(workdir)

--
components: Library (Lib)
messages: 414871
nosy: afeblot
priority: normal
severity: normal
status: open
title: tempfile.TemporaryDirectory fails removing dir in some edge cases 
related to symlinks
versions: Python 3.9

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[issue46913] UBSAN: test_ctypes, test_faulthandler and test_hashlib are failing

[STINNER Victor]

STINNER Victor  added the comment:

I enabled the test on ASAN on test_crypt and I confirm that I get a crash on 
calling a NULL function.

The Python crypt.crypt() function calls the C function crypt_r() which is 
intercepted by libasan, but the libasan implementation calls a NULL function. I 
don't know why.

$ ./configure --with-address-sanitizer --with-pydebug
$ make clean
$ ASAN_OPTIONS="detect_leaks=0:allocator_may_return_null=1:handle_segv=0" make
$ ASAN_OPTIONS="detect_leaks=0:allocator_may_return_null=1:handle_segv=0" gdb 
-args ./python -m test -v test_crypt 
(gdb) run
(...)
0:00:00 load avg: 0.53 Run tests sequentially
0:00:00 load avg: 0.53 [1/1] test_crypt

Program received signal SIGSEGV, Segmentation fault.
0x in ?? ()

(gdb) where
#0  0x in ?? ()
#1  0x7761189f in __interceptor_crypt_r.part.0 () from 
/lib64/libasan.so.6
#2  0x7fffe6a40821 in crypt_crypt_impl (module=, word=0xfcb050 
 "", salt=0x6080004bc660 
"$6$d8Imx7a5WbE12iK4")
at /home/vstinner/python/main/Modules/_cryptmodule.c:44
#3  0x7fffe6a40695 in crypt_crypt (module=, args=0x62901368, nargs=2) at 
/home/vstinner/python/main/Modules/clinic/_cryptmodule.c.h:58
(...)

$ ASAN_OPTIONS="detect_leaks=0:allocator_may_return_null=1:handle_segv=0" 
./python -m test -v test_crypt 
(...)
0:00:00 load avg: 0.56 Run tests sequentially
0:00:00 load avg: 0.56 [1/1] test_crypt
Fatal Python error: Segmentation fault

Current thread 0x7f367c6c77c0 (most recent call first):
  File "/home/vstinner/python/main/Lib/crypt.py", line 82 in crypt
  File "/home/vstinner/python/main/Lib/crypt.py", line 94 in _add_method
  File "/home/vstinner/python/main/Lib/crypt.py", line 105 in 
  File "", line 241 in _call_with_frames_removed
  File "", line 931 in exec_module
  File "", line 690 in _load_unlocked
  File "", line 1149 in _find_and_load_unlocked
  File "", line 1178 in _find_and_load
  File "/home/vstinner/python/main/Lib/test/test_crypt.py", line 6 in 
  (...)

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[issue46976] Update macOS installer builds to use ncurses 6.3

[Ned Deily]

New submission from Ned Deily :

The python.org macOS installers include a private copy of the ncurses library; 
it has not been updated from 5.9 in a long time. The current upstream version 
is 6.3 and includes bug and security fixes; we should update to it.

--
components: macOS
messages: 414869
nosy: ned.deily, ronaldoussoren
priority: high
severity: normal
stage: needs patch
status: open
title: Update macOS installer builds to use ncurses 6.3
versions: Python 3.10, Python 3.11, Python 3.9

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[issue46973] Provide make target to regenerate autoconf files with container

[Christian Heimes]

Christian Heimes  added the comment:


New changeset 434ffb7f1f86e6b0cdfad3ede59993934d86e464 by Christian Heimes in 
branch 'main':
bpo-46973: Add regen-configure make target (GH-31792)
https://github.com/python/cpython/commit/434ffb7f1f86e6b0cdfad3ede59993934d86e464


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[issue46913] UBSAN: test_ctypes, test_faulthandler and test_hashlib are failing

[STINNER Victor]

STINNER Victor  added the comment:

Current status of tests skipped on ASAN, MSAN and UBSAN.

Only ASAN (1):

* _test_multiprocessing.py:76:if support.check_sanitizer(address=True):

ASAN and MSAN (10):

* test___all__.py:14:if support.check_sanitizer(address=True, memory=True):
* test_concurrent_futures.py:35:if support.check_sanitizer(address=True, 
memory=True):
* test_crypt.py:7:if check_sanitizer(address=True, memory=True):
* test_decimal.py:5510:@unittest.skipIf(check_sanitizer(address=True, 
memory=True),
* test_idle.py:5:if check_sanitizer(address=True, memory=True):
* test_peg_generator/__init__.py:7:if support.check_sanitizer(address=True, 
memory=True):
* test_tix.py:7:if check_sanitizer(address=True, memory=True):
* test_tk.py:6:if check_sanitizer(address=True, memory=True):
* test_tools/__init__.py:10:if support.check_sanitizer(address=True, 
memory=True):
* test_ttk_guionly.py:6:if check_sanitizer(address=True, memory=True):

Only UB (1):

* test_hashlib.py:68:SKIP_SHA3 = support.check_sanitizer(ub=True)

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[issue46917] Require IEEE 754 floating point to build Python 3.11

[STINNER Victor]

STINNER Victor  added the comment:

> Remove code handling missing NAN and infinity: float("nan"), float("inf"), 
> math.nan and math.inf are always available.

The code to support missing NaN was already removed by:

New changeset 1b2611eb0283055835e5df632a7a735db8c894b8 by Victor Stinner in 
branch 'main':
bpo-46656: Remove Py_NO_NAN macro (GH-31160)
https://github.com/python/cpython/commit/1b2611eb0283055835e5df632a7a735db8c894b8

In fact, math.inf is already always available in Python 3.10 and older. There 
was no "#ifdef" for missing infinity support. In Python 3.10, math.inf is 
implemented as:

static double
m_inf(void)
{
#ifndef PY_NO_SHORT_FLOAT_REPR
return _Py_dg_infinity(0);
#else
return Py_HUGE_VAL;
#endif
}

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[issue46581] _typevar_types and _paramspec_tvars are missing from _GenericAlias.copy_with

[Alex Waygood]

Change by Alex Waygood :


--
stage: patch review -> backport needed

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[issue46677] TypedDict docs are incomplete

[Alex Waygood]

Change by Alex Waygood :


--
stage: patch review -> backport needed

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[issue46917] Require IEEE 754 floating point to build Python 3.11

[STINNER Victor]

STINNER Victor  added the comment:

> bpo-46917: math.nan is now always available (GH-31793)

Technically, it was already the case in practice: see bpo-46656 for the 
rationale and the history of Py_NAN.

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[issue46656] Remove the Py_NO_NAN macro: require NAN to build Python 3.11

[STINNER Victor]

STINNER Victor  added the comment:

> bpo-46656: Remove Py_NO_NAN macro (GH-31160)

Change documented by:

New changeset 7854012077009b9f364f198a8ae38b546ec58313 by Victor Stinner in 
branch 'main':
bpo-46917: math.nan is now always available (GH-31793)
https://github.com/python/cpython/commit/7854012077009b9f364f198a8ae38b546ec58313

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[issue46917] Require IEEE 754 floating point to build Python 3.11

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 7854012077009b9f364f198a8ae38b546ec58313 by Victor Stinner in 
branch 'main':
bpo-46917: math.nan is now always available (GH-31793)
https://github.com/python/cpython/commit/7854012077009b9f364f198a8ae38b546ec58313


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[issue46917] Require IEEE 754 floating point to build Python 3.11

[STINNER Victor]

STINNER Victor  added the comment:

See also bpo-46906 "Add PyFloat_(Pack|Unpack)(2|4|8) to the public C API": the 
implementation supports non-IEEE 754 formats. Once the public C API is added, 
support for non-IEEE 754 formats should be removed.

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[issue46677] TypedDict docs are incomplete

[Jelle Zijlstra]

Jelle Zijlstra  added the comment:

(assigning to myself to remind myself to see the backports through)

--
assignee: docs@python -> Jelle Zijlstra

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[issue46677] TypedDict docs are incomplete

[Jelle Zijlstra]

Jelle Zijlstra  added the comment:


New changeset 8a207e0321db75f3342692905e342f1d5e1add54 by Charlie Zhao in 
branch 'main':
bpo-46677: Add examples of inheritance and attributes to `TypedDict` docs 
(GH-31349)
https://github.com/python/cpython/commit/8a207e0321db75f3342692905e342f1d5e1add54


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[issue46975] clang: error: linker command failed with exit code 1 (use -v to see invocation) on m1 mac

[Battant]

New submission from Battant :

Hello,

Here is my configuration

mac os 12.2.1
mac m1 pro 2021

step to reproduce
1. on mac m1, clone cpython repository main branch
run
./confugure
make
Actual result :
gcc   -fno-semantic-interposition -fprofile-instr-generate 
-Wl,-stack_size,100  -framework CoreFoundation -o python.exe 
Programs/python.o libpython3.10d.a -ldl   -framework CoreFoundation
gcc   -fno-semantic-interposition -fprofile-instr-generate 
-Wl,-stack_size,100  -framework CoreFoundation -o Programs/_testembed 
Programs/_testembed.o libpython3.10d.a -ldl   -framework CoreFoundation
Undefined symbols for architecture arm64:
  "_libintl_bindtextdomain", referenced from:
Undefined symbols for architecture arm64:
  "_libintl_bindtextdomain", referenced from:
  __locale_bindtextdomain_impl in libpython3.10d.a(_localemodule.o)
  __locale_bindtextdomain_impl in libpython3.10d.a(_localemodule.o)
  "_libintl_dcgettext", referenced from:
  "_libintl_dcgettext", referenced from:
  __locale_dcgettext_impl in libpython3.10d.a(_localemodule.o)
  __locale_dcgettext_impl in libpython3.10d.a(_localemodule.o)
  "_libintl_dgettext", referenced from:
  "_libintl_dgettext", referenced from:
  __locale_dgettext_impl in libpython3.10d.a(_localemodule.o)
  __locale_dgettext_impl in libpython3.10d.a(_localemodule.o)
  "_libintl_gettext", referenced from:
  "_libintl_gettext", referenced from:
  __locale_gettext_impl in libpython3.10d.a(_localemodule.o)
  __locale_gettext_impl in libpython3.10d.a(_localemodule.o)
  "_libintl_setlocale", referenced from:
  "_libintl_setlocale", referenced from:
  __locale_setlocale_impl in libpython3.10d.a(_localemodule.o)
  _locale_decode_monetary in libpython3.10d.a(_localemodule.o)
  __locale_setlocale_impl in libpython3.10d.a(_localemodule.o)
  _locale_decode_monetary in libpython3.10d.a(_localemodule.o)
  "_libintl_textdomain", referenced from:
  "_libintl_textdomain", referenced from:
  __locale_textdomain_impl in libpython3.10d.a(_localemodule.o)
  __locale_textdomain_impl in libpython3.10d.a(_localemodule.o)
ld: symbol(s) not found for architecture arm64
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[3]: *** [python.exe] Error 1
make[3]: *** Waiting for unfinished jobs
make[3]: *** [Programs/_testembed] Error 1
make[2]: *** [build_all_generate_profile] Error 2
make[1]: *** [profile-gen-stamp] Error 2
make: *** [profile-run-stamp] Error 2

Could you help me please to fix this issus ?

Best regards

Battant

--
components: macOS
messages: 414859
nosy: Battant, ned.deily, ronaldoussoren
priority: normal
severity: normal
status: open
title: clang: error: linker command failed with exit code 1 (use -v to see 
invocation) on m1 mac
type: compile error
versions: Python 3.11

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[issue46198] Duplicate and unused code in tests

[Jelle Zijlstra]

Change by Jelle Zijlstra :


--
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[issue46771] Add some form of cancel scopes

[Alex Grönholm]

Alex Grönholm  added the comment:

Yeah, I'm still interested. I'll create a new BPO when I have something.

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[issue46198] Duplicate and unused code in tests

[Jelle Zijlstra]

Change by Jelle Zijlstra :


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[issue46771] Add some form of cancel scopes

[Guido van Rossum]

Guido van Rossum  added the comment:

Good think I forgot to close the issue. ;-)

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[issue46771] Add some form of cancel scopes

[Andrew Svetlov]

Andrew Svetlov  added the comment:

The implementation has landed, docs are still required.

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[issue46198] Duplicate and unused code in tests

[Jelle Zijlstra]

Jelle Zijlstra  added the comment:


New changeset 6c83c8e6b56b57a8a794e7b6c07837be4ce3bb97 by Nikita Sobolev in 
branch 'main':
bpo-46198: rename duplicate tests and remove unused code (GH-30297)
https://github.com/python/cpython/commit/6c83c8e6b56b57a8a794e7b6c07837be4ce3bb97


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[issue46771] Add some form of cancel scopes

[Guido van Rossum]

Guido van Rossum  added the comment:

I'm closing this, the asyncio.timeout() context manager has been merged. Thanks 
Andrew!

@agronholm you said you were interested in tweaking the cancellation behavior 
some more. If you're still interested, let's discuss that in a separate bpo 
(please +nosy me if you create one).

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[issue46771] Add some form of cancel scopes

[Guido van Rossum]

Guido van Rossum  added the comment:


New changeset f537b2a4fb86445ee3bd6ca7f10bc9d3a9f37da5 by Andrew Svetlov in 
branch 'main':
bpo-46771: Implement asyncio context managers for handling timeouts (GH-31394)
https://github.com/python/cpython/commit/f537b2a4fb86445ee3bd6ca7f10bc9d3a9f37da5


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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Michael Torrie]

On 3/10/22 06:03, Marco Sulla wrote:
> I tried Debian on a VM, but I found it too much basical. A little
> example: it does not have the shortcut ctrl+alt+t to open a terminal
> that Ubuntu has. I'm quite sure it's simple to add, but I'm starting
> to be old and lazy...

Debian has the same desktop environments available for install as the
rest of the distros.  Gnome 3, Mate, LXDE, XFCE, KDE, etc.  Whatever
works for you on Ubuntu should work on Debian.
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[issue35677] Do not automount in stat() by default

[Pádraig Brady]

Pádraig Brady  added the comment:

I think this change is not needed as fstatat() implies AT_NO_AUTOMOUNT since 
Linux 4.11
The fstatat(2) man page is confusing, and I've attempted to clarify with the 
patch attached to:
https://lists.gnu.org/archive/html/coreutils/2022-03/msg00014.html

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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Loris Bennett]

Marco Sulla  writes:

> On Thu, 10 Mar 2022 at 04:50, Michael Torrie  wrote:
>>
>> On 3/9/22 13:05, Marco Sulla wrote:
>> > So my laziness pays. I use only LTS distros, and I update only when
>> > there are security updates.
>> > PS: any suggestions for a new LTS distro? My Lubuntu is reaching its
>> > end-of-life. I prefer lightweight debian-like distros.
>>
>> Maybe Debian itself?
>
> I tried Debian on a VM, but I found it too much basical. A little
> example: it does not have the shortcut ctrl+alt+t to open a terminal
> that Ubuntu has. I'm quite sure it's simple to add, but I'm starting
> to be old and lazy...

The shortcuts are properties of the desktop environment.  You could just
install LXDE/LXQt on Debian if that's what you're used to from Lubuntu.
Of course, if you're too old and lazy to set up a shortcut, you might
also be too old and lazy to install a different desktop environment ;-)

Cheers,

Loris

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How to test input via subprocess.Popen with data from file

[Loris Bennett]

Hi,

I have a command which produces output like the
following:

  Job ID: 9431211
  Cluster: curta
  User/Group: build/staff
  State: COMPLETED (exit code 0)
  Nodes: 1
  Cores per node: 8
  CPU Utilized: 01:30:53
  CPU Efficiency: 83.63% of 01:48:40 core-walltime
  Job Wall-clock time: 00:13:35
  Memory Utilized: 6.45 GB
  Memory Efficiency: 80.68% of 8.00 GB

I want to parse this and am using subprocess.Popen and accessing the
contents via Popen.stdout.  However, for testing purposes I want to save
various possible outputs of the command as text files and use those as
inputs. 

What format should I use to pass data to the actual parsing function?

I could in both production and test convert the entire input to a string
and pass the string to the parsing method.

However, I could use something like

   test_input_01 = subprocess.Popen(
["cat test_input_01.txt"],
stdout=subprocess.PIPE,
)
  
for the test input and then pass a Popen object to the parsing function.

Any comments on these alternative or suggestions for doing something
completely different?

Cheers,

Loris
 
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[issue45767] Fix types for dev_t processing in posix module

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

PR 31794 supports NODEV and checks for integer overflows.

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[issue45767] Fix types for dev_t processing in posix module

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue46581] _typevar_types and _paramspec_tvars are missing from _GenericAlias.copy_with

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset 32bf3597922ac3f613989582afa2bff43bea8a2f by Matt Bogosian in 
branch 'main':
bpo-46581: Propagate private vars via _GenericAlias.copy_with (GH-31061)
https://github.com/python/cpython/commit/32bf3597922ac3f613989582afa2bff43bea8a2f


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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Chris Angelico]

On Fri, 11 Mar 2022 at 00:05, Marco Sulla  wrote:
>
> On Thu, 10 Mar 2022 at 04:50, Michael Torrie  wrote:
> >
> > On 3/9/22 13:05, Marco Sulla wrote:
> > > So my laziness pays. I use only LTS distros, and I update only when
> > > there are security updates.
> > > PS: any suggestions for a new LTS distro? My Lubuntu is reaching its
> > > end-of-life. I prefer lightweight debian-like distros.
> >
> > Maybe Debian itself?
>
> I tried Debian on a VM, but I found it too much basical. A little
> example: it does not have the shortcut ctrl+alt+t to open a terminal
> that Ubuntu has. I'm quite sure it's simple to add, but I'm starting
> to be old and lazy...

Very easy. I use Debian with Xfce, and it's an easy thing to add
shortcuts - even dynamically (I have Alt+D to dictate notes, but only
while I'm playing Counter-Strike competitively).

Debian + Xfce is a combo that's served me very well for years now. I
didn't much like the latest Adwaita colour scheme, but a small tweak
later, it's fine again.

ChrisA
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[issue46974] set function for lists on numbers, sometimes sorts elements from smallest to largest, and sometimes not

[Eric V. Smith]

Eric V. Smith  added the comment:

This is expected behavior. A set has no defined order. If you convert a set to 
a list, and you want some specific order, you'll need to sort it yourself.

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

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[issue46974] set function for lists on numbers, sometimes sorts elements from smallest to largest, and sometimes not

[PiTeR]

New submission from PiTeR :

set function for lists on numbers, sometimes sorts elements from smallest to 
largest, and sometimes not
to find this bug, sometimes you need to display the result several times
example code:
def tupla():
import random
ilosc = random.randint(0,49)
n=0
lista=[]
i=0
while True:
n = random.randint(1,100)
lista.append(n)
i=i+1
if i==ilosc-1:
break
lista = set(lista)
list(lista)
print(lista)

--
components: Windows
files: bug_1.PNG
messages: 414848
nosy: paul.moore, pio.paluchowski, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: set function for lists on numbers, sometimes sorts elements from 
smallest to largest, and sometimes not
type: behavior
versions: Python 3.10
Added file: https://bugs.python.org/file50666/bug_1.PNG

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[issue46917] Require IEEE 754 floating point to build Python 3.11

[STINNER Victor]

Change by STINNER Victor :


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[issue46917] Require IEEE 754 floating point to build Python 3.11

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 9b51fd5d137b662c940f072297b30815f37f105b by Victor Stinner in 
branch 'main':
bpo-46917: Require IEEE 754 to build Python (GH-31790)
https://github.com/python/cpython/commit/9b51fd5d137b662c940f072297b30815f37f105b


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[issue46973] Provide make target to regenerate autoconf files with container

[Christian Heimes]

Change by Christian Heimes :


--
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pull_requests: +29896
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/31792

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[issue46973] Provide make target to regenerate autoconf files with container

[Christian Heimes]

New submission from Christian Heimes :

CPython stores auto-generated autoconf files (configure, aclocal.m4, 
pyconfig.h.in) in git. The files must be regenerated with very specific 
versions of autotools 2.69 + runtimestate patch, autoarchive, and pkg-config's 
m4 macros. I provide a container image based on Alpine 3.13 for automation and 
CI.

Let's add a build target to make it easier for contributors to regenerate the 
files and utilize the container images. The command needs a container runtime 
(podman, docker), though.

--
assignee: christian.heimes
components: Build
messages: 414846
nosy: brett.cannon, christian.heimes, gregory.p.smith
priority: normal
severity: normal
status: open
title: Provide make target to regenerate autoconf files with container
type: enhancement
versions: Python 3.10, Python 3.11, Python 3.9

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Re: Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Jack Dangler]

On 3/10/22 08:03, Marco Sulla wrote:

On Thu, 10 Mar 2022 at 04:50, Michael Torrie  wrote:

On 3/9/22 13:05, Marco Sulla wrote:

So my laziness pays. I use only LTS distros, and I update only when
there are security updates.
PS: any suggestions for a new LTS distro? My Lubuntu is reaching its
end-of-life. I prefer lightweight debian-like distros.

Maybe Debian itself?

I tried Debian on a VM, but I found it too much basical. A little
example: it does not have the shortcut ctrl+alt+t to open a terminal
that Ubuntu has. I'm quite sure it's simple to add, but I'm starting
to be old and lazy...
or why not get a cloud desktop running whatever distro you want and you 
don't have to do anything

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Suggestion for Linux Distro (from PSA: Linux vulnerability)

[Marco Sulla]

On Thu, 10 Mar 2022 at 04:50, Michael Torrie  wrote:
>
> On 3/9/22 13:05, Marco Sulla wrote:
> > So my laziness pays. I use only LTS distros, and I update only when
> > there are security updates.
> > PS: any suggestions for a new LTS distro? My Lubuntu is reaching its
> > end-of-life. I prefer lightweight debian-like distros.
>
> Maybe Debian itself?

I tried Debian on a VM, but I found it too much basical. A little
example: it does not have the shortcut ctrl+alt+t to open a terminal
that Ubuntu has. I'm quite sure it's simple to add, but I'm starting
to be old and lazy...
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Re: Could frozendict or frozenmap be of some use for PEP 683 (Immortal objects)?

[Marco Sulla]

On Wed, 9 Mar 2022 at 23:28, Martin Di Paola  wrote:
> Think in the immutable strings (str). What would happen with a program
> that does heavy parsing? I imagine that it will generate thousands of
> little strings. If those are immortal, the program will fill its memory
> very quickly as the GC will not reclaim their memory.

Well, as far as I know immortality was also suggested for interned
strings. If I understood well, the problem with "normal" strings is
that they are not really immutable in CPython. They have cache etc.
Also frozendict caches hash, but that cache can be easily removed.
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[issue40280] Consider supporting emscripten/webassembly as a build target

[Christian Heimes]

Christian Heimes  added the comment:


New changeset de554d6e02228b840eb6bffaf7d406c0ef368d5f by Christian Heimes in 
branch 'main':
bpo-40280: Skip more tests/features that don't apply to Emscripten (GH-31791)
https://github.com/python/cpython/commit/de554d6e02228b840eb6bffaf7d406c0ef368d5f


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[issue40280] Consider supporting emscripten/webassembly as a build target

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue46972] Documentation: Reference says AssertionError is raised by `assert`, but not all AssertionErrors are.

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

I concur with Eric. The existing documentation looks pretty clear to me. Any 
exception can be raised explicitly, no need to repeat this.

And unittest.TestCase methods do not raise AssertionError. They raise 
TestCase.failureException, which by default is set to AssertionError. It is 
specified in the corresponding module documentation.

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

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[issue46972] Documentation: Reference says AssertionError is raised by `assert`, but not all AssertionErrors are.

[Eric V. Smith]

Eric V. Smith  added the comment:

> I would argue that "The reference documentation for X states that it gets 
> raised under condition Y" generally should be understood as "this is a 
> guarantee that also includes the guarantee that it is not raised under other 
> conditions in correctly written code".

That's definitely not the case in Python, though.

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[issue46971] python takes long time when return big data

[Mark Dickinson]

Mark Dickinson  added the comment:

This is expected. Your timing measures the time for garbage collection of the 
large arrays in addition to the time for the result to be returned.

In the line `result = myfunc()`, the name `result` gets rebound to the value of 
`myfunc()`. That means that `result` is unbound from whatever it was previously 
bound to, and the old value then gets garbage collected.

You can test this by adding a "del result" line as the last line inside the 
"for" loop block.

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

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[issue46972] Documentation: Reference says AssertionError is raised by `assert`, but not all AssertionErrors are.

[Thomas Fischbacher]

Thomas Fischbacher  added the comment:

The documentation of exceptions in the reference is one of the places that 
makes the life of users substantially harder than it ought to be, since the 
documentation appears to not have been written with the intent to give 
guarantees that users can expect correctly written code to follow.

I would argue that "The reference documentation for X states that it gets 
raised under condition Y" generally should be understood as "this is a 
guarantee that also includes the guarantee that it is not raised under other 
conditions in correctly written code".

Other languages often appear to be somewhat stricter w.r.t. interpreting the 
reference documentation as binding for correct code - and for Python, having 
this certainly would help a lot when writing code that can give binding 
guarantees.

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[issue39829] __len__ called twice in the list() constructor

[Jeremiah Pascual]

Jeremiah Pascual  added the comment:

Matt's idea leads to some speedups when implemented correctly (pardon me but I 
have no idea how to use pyperf):

list({}): Mean +- std dev: [orig] 109 ns +- 1 ns -> [modif] 103 ns +- 1 ns: 
1.06x faster
list({1: 2}): Mean +- std dev: [orig] 125 ns +- 1 ns -> [modif] 118 ns +- 1 ns: 
1.05x faster
list({(1, 2, 3): 4}): Mean +- std dev: [orig] 125 ns +- 1 ns -> [modif] 118 ns 
+- 1 ns: 1.05x faster
list((3, 3, 4)): Mean +- std dev: [orig] 89.2 ns +- 4.5 ns -> [modif] 82.9 ns 
+- 4.6 ns: 1.08x faster
list(()): Mean +- std dev: [orig] 70.1 ns +- 0.8 ns -> [modif] 65.5 ns +- 0.8 
ns: 1.07x faster
list({0, 1, 2, ...}): Mean +- std dev: [orig] 74.7 us +- 3.6 us -> [modif] 67.6 
us +- 1.6 us: 1.11x faster
list({9, 3}): Mean +- std dev: [orig] 131 ns +- 2 ns -> [modif] 126 ns +- 4 ns: 
1.04x faster
list(set()): Mean +- std dev: [orig] 115 ns +- 6 ns -> [modif] 110 ns +- 2 ns: 
1.05x faster
list([]): Mean +- std dev: [orig] 73.2 ns +- 5.5 ns -> [modif] 67.8 ns +- 3.4 
ns: 1.08x faster
list([1, 2, 1, 1]): Mean +- std dev: [orig] 93.5 ns +- 9.8 ns -> [modif] 87.9 
ns +- 8.6 ns: 1.06x faster
list([1, 2, 1, 2, 1, 2]): Mean +- std dev: [orig] 93.0 ns +- 3.1 ns -> [modif] 
87.0 ns +- 2.7 ns: 1.07x faster

Benchmark hidden because not significant (3): list({0: 0, 1: ...}), list((4, 5, 
1, ...)), list([4, 1, 3, ...])

Geometric mean: 1.05x faster

Changes compared here: 
https://github.com/python/cpython/compare/main...thatbirdguythatuknownot:patch-17

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[issue46896] add support for watching writes to selected dictionaries

[Mark Shannon]

Mark Shannon  added the comment:

There are three kinds of changes that we might want to watch (that I can think 
of right now):

1. Any change.
   Rather coarse and potentially expensive. Used by Cinder.
2. A new key being added (or a change to the keys version as a proxy).
   Useful for detect shadowing of builtins by module globals, would save the 
keys version check for the module dict in `LOAD_GLOBAL_BUILTINS` and a version 
check in some `LOAD_METHOD` specializations.
3. The value corresponding to a particular key.
   With this we could effectively convert both `LOAD_GLOBAL` specializations 
into a constant, given an effective way to de-optimize.


One way to support the three cases above would be to replace the dict version 
with a pointer to a data structure describing what it watched.
If the pointer is `NULL`, then nothing is being watched.
The data structure would need 2 bits to cover cases 1 and 2, and 1 bit (or 
byte) for each key in the dict keys (or case 1 could be implemented by setting 
all the bits for case 3).

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[issue46972] Documentation: Reference says AssertionError is raised by `assert`, but not all AssertionErrors are.

[Eric V. Smith]

Eric V. Smith  added the comment:

The documentation doesn't say that assert statements are the only place 
AssertionError is raised, so I don't think it's incorrect.

> From this, one can infer the guarantee "the -O flag will suppress 
> AssertionError exceptions from being raised".

I don't think that follows from what the documentation says. It's only talking 
about assert statements.

This is equivalent to StopIteration: it is commonly raised by exhausting 
iterators, but it can be raised elsewhere. Or KeyError: the docs say "Raised 
when a mapping (dictionary) key is not found in the set of existing keys", but 
I've raised them in my own code.

> An assert[{add reference to `assert` definition}] statement fails, or a unit 
> testing related assert{...}() callable detects an assertion violation.

I think that's also misleading, and not an improvement. Why focus just on 
testing? It can certainly be raised elsewhere.

If anything, I think maybe add a note at the top of the list of Concrete 
Exceptions saying these are common ways these exceptions are raised, but they 
can be raised elsewhere. But I'm -0 on such a change.

--
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[issue46972] Documentation: Reference says AssertionError is raised by `assert`, but not all AssertionErrors are.

[Thomas Fischbacher]

New submission from Thomas Fischbacher :

The Python reference says:

(1) https://docs.python.org/3/library/exceptions.html#concrete-exceptions

exception AssertionError
Raised when an assert statement fails.

(2) https://docs.python.org/3/reference/simple_stmts.html#the-assert-statement

"assert ..." is equivalent to "if __debug__: ..."

>From this, one can infer the guarantee "the -O flag will suppress 
>AssertionError exceptions from being raised".

However, there is code in the Python standard library that does a direct "raise 
AssertionError" (strictly speaking, in violation of (1)), and it is just 
reasonable to assume that other code following the design of that would then 
also want to do a direct "raise AssertionError".

This happens e.g. in many methods defined in: unittest/mock.py

The most appropriate fix here may be to change the documentation to not say:

===
exception AssertionError
Raised when an assert statement fails.
===

but instead:

===
exception AssertionError
An assert[{add reference to `assert` definition}] statement fails, or a unit 
testing related assert{...}() callable detects an assertion violation.
===

--
messages: 414837
nosy: tfish2
priority: normal
severity: normal
status: open
title: Documentation: Reference says AssertionError is raised by `assert`, but 
not all AssertionErrors are.

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[issue46971] python takes long time when return big data

[Hu Di]

New submission from Hu Di <476658...@qq.com>:

it takes a long time when python return big data.
generally, when a function return something, it only take less than 1e-5 second,
but when the result is big, like np.random.rand(2048,3,224,224), the time cost 
will increase to 0.1-0.2 second

--
Added file: https://bugs.python.org/file50665/python_performance_issue.py

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