[issue36761] Extended slice assignment + iterable unpacking

[SilentGhost]

Change by SilentGhost :


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[issue36764] Types module doesn't have a type for _abc_data

[Batuhan]

New submission from Batuhan :

Types module doesn't have a type for _abc_data

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title: Types module doesn't have a type for _abc_data

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[issue36694] Excessive memory use or memory fragmentation when unpickling many small objects

[Inada Naoki]

Inada Naoki  added the comment:

I confirmed this fragmentation is caused by memo in Unpickler.

Pickler memos "reduce"-ed tuples while it is just a temporary object.
I am not sure that this behavior is good.

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[issue36764] Types module doesn't have a type for _abc_data

[Roundup Robot]

Change by Roundup Robot :


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[issue36764] Types module doesn't have a type for _abc_data

[SilentGhost]

Change by SilentGhost :


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[issue36764] Types module doesn't have a type for _abc_data

[Inada Naoki]

Inada Naoki  added the comment:

It's implementation detail of abc.  I don't want expose it in public.
(Note that we maintain pure Python version of abc module too.)

Why you need it in types module?
I don't think all types exposed via types module.  Only useful types should be 
exposed.

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[issue36761] Extended slice assignment + iterable unpacking

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

For the second case, you can use

a, *L[::2] = "abc"

For the first case this does not work, because an assignment can have only one 
starred expression.

Making the first case to work as you expected is breaking change. Currently

L[:], *rest = 'abcdef'

sets L to ['a'] and rest to ['b', 'c', 'd', 'e', 'f']. Consistent implementing 
of your idea would set L to ['a', 'b', 'c'] and rest to ['d', 'e', 'f'] 
(because len(L[:]) == 3 before assignment).

What is your use case? Why do you need such syntax?

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[issue36764] Types module doesn't have a type for _abc_data

[Batuhan]

Batuhan  added the comment:

I'm working on a project that is a custom byte code interpreter for some
extended types. I needed ABCData there and i thought types module already
has that, but i was wrong so i added.

Isn't types module exposing some types that are implementation detail such
as cells?

On Wed, May 1, 2019, 12:17 PM Inada Naoki  wrote:

>
> Inada Naoki  added the comment:
>
> It's implementation detail of abc.  I don't want expose it in public.
> (Note that we maintain pure Python version of abc module too.)
>
> Why you need it in types module?
> I don't think all types exposed via types module.  Only useful types
> should be exposed.
>
> --
> nosy: +inada.naoki
>
> ___
> Python tracker 
> 
> ___
>

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[issue36764] Types module doesn't have a type for _abc_data

[Inada Naoki]

Inada Naoki  added the comment:

> I'm working on a project that is a custom byte code interpreter for some
extended types.  I needed ABCData there

I still don't understand why you need _abc_data.


> Isn't types module exposing some types that are implementation detail such as 
> cells?

cell object is implementation detail of CPython core.
While other Python implementations will not have it, it is long lived in 
CPython and it is stable.

On the other hand, _abc_data is implementation detail of extension module, not 
interpreter.

For example, _json.Encoder is not exposed in types module.
If it is really needed, type of _abc_data can be exposed via _abc module.
But I prefer keep internal data opaque unless there are reasonable reason.

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[issue36765] Invalid grammar for f_expression

[Kasra Vand]

New submission from Kasra Vand :

Due to the discussion in following SO question 
https://stackoverflow.com/questions/55933956/what-does-a-star-asterisk-do-in-f-string/55934472#55933956

and the inconsistency of the source behaviour with the documentation I think 
using `"*" or_expr` for f_expression is wrong or at least not what it meant to 
be and very vague. I was wondering if there's any reason for using `"*" 
or_expr`.

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assignee: docs@python
components: Documentation
messages: 341186
nosy: Kasra Vand, docs@python
priority: normal
severity: normal
status: open
title: Invalid grammar for f_expression
type: behavior
versions: Python 3.7

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[issue36765] Invalid grammar for f_expression

[Kasra Vand]

Kasra Vand  added the comment:

Due to the discussion in following SO question 
https://stackoverflow.com/questions/55933956/what-does-a-star-asterisk-do-in-f-string/55934472#55933956

and the inconsistency of the source behaviour with the documentation I think 
using `"*" or_expr` for f_expression is wrong or at least not what it meant to 
be and very vague. I was wondering if there's any reason for using `"*" 
or_expr` instead of let's say just `expr` which I think is what the `or_expr` 
identifier is intended to be.

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[issue36764] Types module doesn't have a type for _abc_data

[Batuhan]

Batuhan  added the comment:

> I still don't understand why you need _abc_data.
I'm using it both for comparisons which needed to build an abstract base class 
and typing. Currently there are 2 ways, i need to create a dummy abc and put 
type() calls everywhere or i need to set a constant to my module and _abc_data 
is totally irrelevant with this. I dont think users want that.

> On the other hand, _abc_data is implementation detail of extension module, 
> not interpreter.
Abstract base classes can be called a core part of python too and when someone 
needs to obtain type of the struct that holds state of ABCs it shouldnt be 
hard, types module should expose it.

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[issue36765] Invalid grammar for f_expression

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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[issue36764] Types module doesn't have a type for _abc_data

[Inada Naoki]

Inada Naoki  added the comment:

> I'm using it both for comparisons which needed to build an abstract base 
> class and typing. Currently there are 2 ways, i need to create a dummy abc 
> and put type() calls everywhere or i need to set a constant to my module and 
> _abc_data is totally irrelevant with this. I dont think users want that.

It doesn't make sense to me.  Could you elaborate?


> Abstract base classes can be called a core part of python too

abc is core part.  But note that _py_abc can be used instead of _abc.
_abc_data is used only when _abc is used as backend of abc.
At least, your pull request doesn't work correctly when _py_abc is used.


>  and when someone needs to obtain type of the struct that holds state of ABCs 
> it shouldnt be hard, types module should expose it.

I think it is bad idea and we don't support such usage officially at all.
Such code doesn't work when _py_abc is used.

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[issue36765] Invalid grammar for f_expression

[Eric V. Smith]

Eric V. Smith  added the comment:

I don't think this is a problem. There are plenty of things allowed by Python's 
grammar that are converted to errors in subsequent passes. For example:

>>> *[1]
  File "", line 1
SyntaxError: can't use starred expression here
>>> *[1],*[2]
(1, 2)

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[issue36764] Types module doesn't have a type for _abc_data

[Batuhan]

Batuhan  added the comment:

It is based on default behavior of cpython. It tries to import _abc first 
instead of _py_abc and this type targets c implementation.

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[issue30458] [security][CVE-2019-9740][CVE-2019-9947] HTTP Header Injection (follow-up of CVE-2016-5699)

[miss-islington]

miss-islington  added the comment:


New changeset 2fc936ed24cf04ed32f6015a8aa78c8ea40da66b by Miss Islington (bot) 
(Xtreak) in branch 'master':
bpo-30458: Disable https related urllib tests on a build without ssl (GH-13032)
https://github.com/python/cpython/commit/2fc936ed24cf04ed32f6015a8aa78c8ea40da66b


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[issue30458] [security][CVE-2019-9740][CVE-2019-9947] HTTP Header Injection (follow-up of CVE-2016-5699)

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue36763] PEP 587: Rework initialization API to prepare second version of the PEP

[STINNER Victor]

Change by STINNER Victor :


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[issue36694] Excessive memory use or memory fragmentation when unpickling many small objects

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue36694] Excessive memory use or memory fragmentation when unpickling many small objects

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

PR 13036 makes the C implementation no longer memoizing temporary objects. This 
decreases memory fragmentation and peak memory consumption on pickling and 
unpickling.

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[issue36766] Typos in docs and code comments

[Karthikeyan Singaravelan]

New submission from Karthikeyan Singaravelan :

I ran aspell through the files and found below to be typos while manually 
filtering the aspell output. I have classified it into sections since I am not 
sure if code comments are worth fixing and added relevant files where they are 
present. I am tagging the issue for PyCon US dev sprints. Please don't make a 
PR for this if you have already contributed a PR.

# Docs folder

Cotnent -> Content-Transfer-Encoding (Doc/library/email.generator.rst)
attibute -> attribute (Doc/library/pyclbr.rst)
milleseconds -> milliseconds (Doc/library/idle.rst)

# Code comments

actuall -> actual (Lib/test/test_dataclasses.py)
actully -> actually (Lib/contextlib.py)
agains -> against (Lib/pathlib.py)
Amerian -> American (Lib/test/test_random.py)
Conflic -> Conflict (Lib/idlelib/idle_test/test_config.py)
Depedent -> Dependent (Lib/test/datetimetester.py)
Diffent -> Different (Lib/test/support/__init__.py)
Diplay -> Display (Objects/object.c)
Doens't -> Doesn't (Lib/test/test_ssl.py)
Dono't -> Don't (Lib/test/test_importlib/test_lazy.py)
intermitted -> intermittent (Lib/test/pickletester.py)
invokation -> Invocation (Lib/platform.py)
occuring -> occurring (Lib/test/test_tools/test_i18n.py)
permuations -> permutations (Lib/tokenize.py)
resouce -> resource (Lib/multiprocessing/resource_sharer.py)
statists -> statistics (Lib/pstats.py)

# Docstring

Dafault -> Default (Lib/turtle.py)
Diplay -> Display (Lib/idlelib/help.py)
Intput -> Input (Lib/lib2to3/pgen2/tokenize.py)
milleseconds -> milliseconds (Lib/idlelib/configdialog.py, 
Lib/idlelib/help.html)

--
assignee: Mariatta
components: Documentation
messages: 341194
nosy: Mariatta, cheryl.sabella, xtreak
priority: normal
severity: normal
status: open
title: Typos in docs and code comments
type: behavior
versions: Python 3.8

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[issue36763] PEP 587: Rework initialization API to prepare second version of the PEP

[STINNER Victor]

Change by STINNER Victor :


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[issue36763] PEP 587: Rework initialization API to prepare second version of the PEP

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 1a9f0d8efded4bf37c864ed572beff28c43c7c77 by Victor Stinner in 
branch 'master':
bpo-36763: Add _PyCoreConfig_SetString() (GH-13035)
https://github.com/python/cpython/commit/1a9f0d8efded4bf37c864ed572beff28c43c7c77


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[issue36767] Segmentation fault when running c extension on macOS

[Senhui Guo]

New submission from Senhui Guo :

I was trying to build a c extension with cpython while it keeps crashing when I 
get it running, the code is quite simple:
```cpp
#include "Python.h"

int main ()
{
PyObject *p;
p = PySet_New(NULL);
}
```

I build with command `clang 
-I/usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/include/python3.7m
 
-L/usr/local/opt/python/Frameworks/Python.framework/Versions/3.7/lib/python3.7/config-3.7m-darwin
 -lpython3.7m test.c -o run`
when I ran it `./run`, segmentation fault: 11 kicks in
However, if I go with python2, it worked fine:
`clang -I 
/usr/local/Cellar/python\@2/2.7.16/Frameworks/Python.framework/Versions/2.7/include/python2.7
 -L 
/usr/local/opt/python\@2/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config/
 -lpython2.7 test.c -o run`

I was wondering if it is the problem with macOS? I tried build python from 
source, but didn't work, keeps crashing

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messages: 341196
nosy: Senhui Guo, ned.deily, ronaldoussoren
priority: normal
severity: normal
status: open
title: Segmentation fault when running c extension on macOS
type: crash
versions: Python 3.7

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[issue36768] distutils.util.convert_path mangles windows paths with forward slashes

[Charles P]

New submission from Charles P :

https://github.com/python/cpython/blob/master/Lib/distutils/util.py#L106-L131

Due to the split('/') and os.path.join(), this function converts an absolute 
path of the form "C:/foobar" into a relative "C:foobar", which is likely to be 
entirely different

Usecase:

pip install --prefix=/home/charles/python foobar

within an MSYS2 terminal automagically converts the path to 
C:/Users/charles/python for some reason or another, but it's not exactly 
uncommon for users to use forward slashes on Windows regardless

I'm not entirely sure what the correct fix would be here, or even if it should 
be fixed at a higher level - in setuptools or pip

--
components: Distutils
messages: 341197
nosy: LordAro, dstufft, eric.araujo
priority: normal
severity: normal
status: open
title: distutils.util.convert_path mangles windows paths with forward slashes
type: behavior
versions: Python 3.7

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[issue36769] doc Document that fnmatch.filter supports any kind of iterable not just lists

[Andrés Delfino]

New submission from Andrés Delfino :

Documentation on fnmatch.filter says:

Return the subset of the list of names that match pattern. It is the same as [n 
for n in names if fnmatch(n, pattern)], but implemented more efficiently.

But the function actual accepts any kind of iterable. I think it should be 
documented.

--
assignee: docs@python
components: Documentation
messages: 341198
nosy: adelfino, docs@python
priority: normal
severity: normal
status: open
title: doc Document that fnmatch.filter supports any kind of iterable not just 
lists
type: enhancement
versions: Python 3.7, Python 3.8, Python 3.9

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[issue36769] doc Document that fnmatch.filter supports any kind of iterable not just lists

[Andrés Delfino]

Change by Andrés Delfino :


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[issue26493] Bad formatting in WinError 193 when using subprocess.check_call

[Steve Dower]

Steve Dower  added the comment:

> I suggested creating a new issue to fix the calls that omit this flag.

Right, that's a separate issue that is easily fixed (and backported, IMHO). 
Though I suspect that we've not used the flags in those ones because we think 
we *can* properly format the message, so fixing the use of inserts is a better 
option than simply going back to the unformatted message.

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[issue34616] implement "Async exec"

[Andrew Svetlov]

Change by Andrew Svetlov :


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[issue34616] implement "Async exec"

[Brett Cannon]

Change by Brett Cannon :


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[issue36767] Segmentation fault when running c extension on macOS

[Ronald Oussoren]

Ronald Oussoren  added the comment:

The program you include in your report will crash because the interpreter is 
never initialised.

See the embedding documentation for more information: 
https://docs.python.org/3/extending/embedding.html

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[issue36770] stdlib - shutil.make_archive - add support for different ZIP compression method

[Owen Chia]

New submission from Owen Chia :

if you just want to use different zip compression method, no need to rewrite 
entire _make_zipfile function.

e.g.
>>> shutil.make_archive('archive', 'zip_lzma', '/path/to/whatever')

--
components: Library (Lib)
files: shutil.make_archive.patch
keywords: patch
messages: 341201
nosy: giampaolo.rodola, owenchia, tarek
priority: normal
severity: normal
status: open
title: stdlib - shutil.make_archive - add support for different ZIP compression 
method
type: enhancement
versions: Python 3.8
Added file: https://bugs.python.org/file48293/shutil.make_archive.patch

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[issue29512] regrtest refleak: implement bisection feature

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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[issue34616] implement "Async exec"

[Matthias Bussonnier]

Matthias Bussonnier  added the comment:

Slides and demo (videos) during PyCon2019 Language Summit: 
https://github.com/Carreau/talks/tree/master/2019-05-01-Language-Summit

One question was how to handle non-asyncio in Core Python, REPL.

My response was to not take care of that in the first time, but provide the 
building blocks for alternative REPL, in a second time provide an async-input, 
and a way to register runner for alternative async libraries.

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[issue34616] implement "Async exec"

[Nathaniel Smith]

Nathaniel Smith  added the comment:

> My response was to not take care of that in the first time, but provide the 
> building blocks for alternative REPL, in a second time provide an 
> async-input, and a way to register runner for alternative async libraries.

Yeah, I think this is pretty simple: the runtime/stdlib should provide the 
primitives to compile top-level async code, get coroutines, etc., and then a 
REPL like ipython can take care of handing that off to asyncio or whatever 
library they want.

Maybe in the long run the builtin REPL should get async support "out of the 
box", but that's much less clear, and anyway we should split that off into a 
separate issue if we want to discuss it.

async-input isn't even useful for ipython, is it? you use prompt-toolkit :-)

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[issue36329] use the right python "make -C Doc/ serve"

[Stéphane Wirtel]

Stéphane Wirtel  added the comment:

>Personally, I'd prefer removing the 'serve' target completely. make -C
>Doc htmlview should already cover most of its use cases. There is no
>deprecation period needed and there is already a replacement (and IMO
>better) for it.

Hi Berker,

When I have read your message, I was surprised because this target
already exists since 2010. It's true we can run the makefile with 

my current workflow is 

make -C Doc/ venv && make -C Doc/ html serve and open my browser at
http://localhost:8000

but with your suggestion, I think it's better for us and also for the
contributors, just make -C Doc/ venv htmlview. This target will open the
browser with the result of the html build.

So, I have discussed with @Julien Palard and he told me that he did not
use the 'serve' target and he discovered the target via my issue.

But there will be an other issue, in the devguide, there is also a
'serve' target in the Makefile with a copy of tools/serve.py.

But there is no htmlview target. 

For the moment, we have a common solution for the two project if we want
to show the result to the user, make serve.

We could:

* remove 'make serve' from CPython and Devguide
* remove tools/serve.py from CPython and Devguide
* add htmlview to the DevGuide
* update the documentation 

+1 for removing the serve.py script and use htmlview.

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[issue13611] Integrate ElementC14N module into xml.etree package

[Stefan Behnel]

Stefan Behnel  added the comment:

> I personally think it's ready to go into the last alpha release

Since I didn't get any negative comments or requests for deferral, I'll merge 
this today to get the feature into the last (still unreleased) alpha. We still 
have the beta phase to resolve issues with it.

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[issue36742] urlsplit doesn't accept a NFKD hostname with a port number

[Steve Dower]

Steve Dower  added the comment:


New changeset 98a4dcefbbc3bce5ab07e7c0830a183157250259 by Steve Dower in branch 
'2.7':
bpo-36742: Fixes handling of pre-normalization characters in urlsplit() 
(GH-13017)
https://github.com/python/cpython/commit/98a4dcefbbc3bce5ab07e7c0830a183157250259


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[issue36742] urlsplit doesn't accept a NFKD hostname with a port number

[Steve Dower]

Steve Dower  added the comment:

I'll leave the 3.6 backport in Ned's hands and close this issue.

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[issue36742] urlsplit doesn't accept a NFKD hostname with a port number

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

> I'll leave the 3.6 backport in Ned's hands and close this issue.

3.5 was added as an affected version and seems the original fix was merged to 
3.5 too. 3.4 is EoL so is it worthy of backporting to 3.5? I guess the backport 
would not have merge conflicts and is straightforward.

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[issue34616] implement "Async exec"

[Yury Selivanov]

Yury Selivanov  added the comment:

> Yeah, I think this is pretty simple: the runtime/stdlib should provide the 
> primitives to compile top-level async code, get coroutines, etc., and then a 
> REPL like ipython can take care of handing that off to asyncio or whatever 
> library they want.

Exactly.  FWIW I'm +1 to have this in 3.8.  Do you have a patch for this?  If 
not I can take a look at this myself tomorrow or the day after.

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[issue36771] Feature Request: An option to os.walk() to return os.DirEntry lists instead of just filenames/dirnames

[CJ Kucera]

New submission from CJ Kucera :

It'd be nice to have an option to os.walk which would return DirEntry objects 
in its return tuple, as opposed to just the string filenames/dirnames.  (Or 
failing that, an alternate function which does so.)  The function already uses 
os.scandir() internally, so the DirEntry objects already exist -- I assume it'd 
be a pretty easy change.  At the moment, if I want to be efficient and use 
os.scandir() myself, I've got to basically reimplement os.walk(), which seems 
silly since os.walk is already calling scandir itself.

--
components: Library (Lib)
messages: 341210
nosy: apocalyptech
priority: normal
severity: normal
status: open
title: Feature Request: An option to os.walk() to return os.DirEntry lists 
instead of just filenames/dirnames
type: enhancement
versions: Python 3.7

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[issue36329] use the right python "make -C Doc/ serve"

[Berker Peksag]

Berker Peksag  added the comment:

Yeah, we can add htmlview to devguide. I’ve even added it to Django after I
discovered it in CPython :)
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[issue36771] Feature Request: An option to os.walk() to return os.DirEntry lists instead of just filenames/dirnames

[Roundup Robot]

Change by Roundup Robot :


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[issue36742] urlsplit doesn't accept a NFKD hostname with a port number

[Steve Dower]

Steve Dower  added the comment:

Yes, you're right. I'll do that port as well.

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[issue36742] urlsplit doesn't accept a NFKD hostname with a port number

[Steve Dower]

Change by Steve Dower :


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[issue36771] Feature Request: An option to os.walk() to return os.DirEntry lists instead of just filenames/dirnames

[CJ Kucera]

CJ Kucera  added the comment:

I've started up a Github PR for this, btw, though IMO it's not really in a 
mergeable state yet:

1) I wasn't sure what to do about os.fwalk(), since that *doesn't* already 
generate DirEntry objects, and this change would introduce a small 
inconsistency between the two, functionalitywise.
2) Also wasn't sure what to do about unit tests, though I'll ponder that some 
more once I've got some time later.
3) The actual implementation is pretty trivial, but could perhaps be handled 
differently.

The systems's still processing my CLA signature, as well, so there's that too.  
:)

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[issue34442] zlib module not built on windows

[Zachary Ware]

Zachary Ware  added the comment:

With no further explanation of what went wrong, I'm closing the issue.

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[issue36757] uuid constructor accept invalid strings (extra dash)

[Cédric Cabessa]

Cédric Cabessa  added the comment:

> Is there are reason your validator doesn't use uuid.UUID to normalize the 
> value? That is, whatever the customer provides, why not use the result of 
> stringifying the resulting UUID

Yes, this is exactly what we do now

However this behaviour is a bit surprising, we were thinking that uuid.UUID 
could be used as a validator

I understand the risk of breaking existing code with a fix that enforce a 
strict form.

Maybe a line should be added in the documentation to prevent people using this 
as a validator without more check?

But ok, you can close the bug if you prefer ... I think there no perfect 
solution :-)

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[issue27682] wsgiref BaseHandler / SimpleHandler can raise additional errors when handling an error

[Berker Peksag]

Berker Peksag  added the comment:


New changeset 3d37ea25dc97e4cb024045581979570835deb13c by Berker Peksag (Petter 
Strandmark) in branch 'master':
bpo-27682: Handle client connection terminations in wsgiref (GH-9713)
https://github.com/python/cpython/commit/3d37ea25dc97e4cb024045581979570835deb13c


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[issue27682] wsgiref BaseHandler / SimpleHandler can raise additional errors when handling an error

[miss-islington]

Change by miss-islington :


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[issue13611] Integrate ElementC14N module into xml.etree package

[Zackery Spytz]

Zackery Spytz  added the comment:

The PR has reference leaks.

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[issue27682] wsgiref BaseHandler / SimpleHandler can raise additional errors when handling an error

[Berker Peksag]

Berker Peksag  added the comment:


New changeset 47ffc1a9f6fab1c17cdcc325d4af066317369ed7 by Berker Peksag (Miss 
Islington (bot)) in branch '3.7':
bpo-27682: Handle client connection terminations in wsgiref (GH-9713)
https://github.com/python/cpython/commit/47ffc1a9f6fab1c17cdcc325d4af066317369ed7


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[issue27682] wsgiref BaseHandler / SimpleHandler can raise additional errors when handling an error

[Berker Peksag]

Berker Peksag  added the comment:

Thank you!

--
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versions:  -Python 3.5, Python 3.6

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[issue13611] Integrate ElementC14N module into xml.etree package

[Stefan Behnel]

Stefan Behnel  added the comment:

Thanks for testing, Zackery. I resolved the reference leaks. They were already 
in the PR for issue 36676. Both PRs updated.

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[issue34616] implement "Async exec"

[Matthias Bussonnier]

Matthias Bussonnier  added the comment:

> async-input isn't even useful for ipython, is it? you use prompt-toolkit :-)


You don't have to use prompt_toolkit (https://github.com/ipython/rlipython), 
but yes we don't need this. 

> Do you have a patch for this?  If not I can take a look at this myself 
> tomorrow or the day after.

No, I do not have a patch. I can provide a few test case and I am happy to 
spend some task to sit-down and discuss what we exactly do so far in IPython. 
I'm flying back Sunday morning.

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[issue36771] Feature Request: An option to os.walk() to return os.DirEntry lists instead of just filenames/dirnames

[Stéphane Wirtel]

Stéphane Wirtel  added the comment:

Hi,

I think you have to create a new function and not to modify the current
os.walk(), just because you change the type of the returned value.

We have to avoid the inconsistency for the caller of os.walk(). is it a
list of DirEntry or another list?

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[issue34616] implement "Async exec"

[Yury Selivanov]

Yury Selivanov  added the comment:

> No, I do not have a patch. I can provide a few test case

That would be helpful!

> and I am happy to spend some task to sit-down and discuss what we exactly do 
> so far in IPython. I'm flying back Sunday morning.

Yes, let's do that around Friday/Saturday (feel free to ping me via a Twitter 
DM).  I'm also leaving on Sunday.

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[issue26493] Bad formatting in WinError 193 when using subprocess.check_call

[Eryk Sun]

Eryk Sun  added the comment:

> I suspect that we've not used the flags in those ones because we 
> think we *can* properly format the message, so fixing the use of 
> inserts is a better option than simply going back to the 
> unformatted message.

We're advised that it's "unsafe to take an arbitrary system error code returned 
from an API and use FORMAT_MESSAGE_FROM_SYSTEM without 
FORMAT_MESSAGE_IGNORE_INSERTS". We don't control the content of system error 
messages. If we get the number and type of arguments wrong for the message 
inserts, then FormatMessageW may fail with an invalid parameter error, as it 
does in the examples I showed, or return nonsense, or even crash the process 
due to an unhandled access violation. 

Also, nothing was implemented in _overlapped.FormatMessage or 
_ctypes.FormatError to special case an `Arguments` array for particular error 
codes, or even to expose this capability to Python code. I think omitting the 
flag was just a mistake.

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[issue36771] Feature Request: An option to os.walk() to return os.DirEntry lists instead of just filenames/dirnames

[CJ Kucera]

CJ Kucera  added the comment:

Yeah, I'd wondered that too (re: a separate function) but it seemed like an 
awful lot of duplicated code.  The PR I'd put through just changes the 
datatypes within the `filenames` and `dirnames` lists...  I'd been thinking 
that'd be sufficient since you wouldn't get that without specifying the 
optional boolean, but perhaps not.

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[issue36764] Types module doesn't have a type for _abc_data

[Batuhan]

Batuhan  added the comment:

We can try to obtain the type of ABCData and if we can't (if py_abc is
used) we can set ABCData to NotImplemented.

On Wed, May 1, 2019, 2:56 PM Batuhan  wrote:

>
> Batuhan  added the comment:
>
> It is based on default behavior of cpython. It tries to import _abc first
> instead of _py_abc and this type targets c implementation.
>
> --
>
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> 
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[issue36673] Comment/PI parsing support for ElementTree

[Stefan Behnel]

Stefan Behnel  added the comment:


New changeset 43851a202cabce1e6be699e7177735c778b6697e by Stefan Behnel in 
branch 'master':
bpo-36673: Implement comment/PI parsing support for the TreeBuilder in 
ElementTree. (#12883)
https://github.com/python/cpython/commit/43851a202cabce1e6be699e7177735c778b6697e


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[issue36762] Teach "import *" to warn when overwriting globals or builtins

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

What if existing globals are overwritten intentionally? For example, the stat 
module defines some constant and then use the star import from _stat. Other 
example is the datetime module.

--
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[issue36673] Comment/PI parsing support for ElementTree

[Stefan Behnel]

Change by Stefan Behnel :


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[issue34616] implement "Async exec"

[Matthias Bussonnier]

Matthias Bussonnier  added the comment:

Extra notes from in-person discussion; 
We might want a both a Sync-REPL and Async-REPL `compile()` mode depending on 
wether the REPL support async. 

One of the other question was wether `exec` should look at wether an eventloop 
is running, or if it should just return a coroutine and it's the -programmer 
job to check wether there is an event loop or not and do the right thing. 

Also for info all the top level async-await PR and issues on IPython can be 
found here: 
https://github.com/ipython/ipython/issues?q=label%3Aasync%2Fawait+is%3Aclosed

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[issue36676] Make ET.XMLParser target aware of namespace prefixes

[Stefan Behnel]

Stefan Behnel  added the comment:


New changeset dde3eebdaa8d2c51971ca704d53af7cbcda8bb34 by Stefan Behnel in 
branch 'master':
bpo-36676: Namespace prefix aware parsing support for the ET.XMLParser target 
(GH-12885)
https://github.com/python/cpython/commit/dde3eebdaa8d2c51971ca704d53af7cbcda8bb34


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[issue30458] [security][CVE-2019-9740][CVE-2019-9947] HTTP Header Injection (follow-up of CVE-2016-5699)

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue34616] implement "Async exec"

[Andrew Svetlov]

Andrew Svetlov  added the comment:

I recall the idea of passing a specific flag to `compile()` for accepting await 
and family on top level of passed code string.

Than compile can return a code object with CO_COROUTINE flag set.

Returned code object can be analyzed for this flag and executed with `await 
exec(code)`.

Actual coroutine executor can be asyncio/trio/twisted/whatever, it depends on 
what code calls this `await`.

Did I miss something?

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[issue13611] Integrate ElementC14N module into xml.etree package

[Stefan Behnel]

Stefan Behnel  added the comment:


New changeset e1d5dd645d5f59867cb0ad63179110f310cbca89 by Stefan Behnel in 
branch 'master':
bpo-13611: C14N 2.0 implementation for ElementTree (GH-12966)
https://github.com/python/cpython/commit/e1d5dd645d5f59867cb0ad63179110f310cbca89


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[issue36676] Make ET.XMLParser target aware of namespace prefixes

[Stefan Behnel]

Change by Stefan Behnel :


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[issue13611] Integrate ElementC14N module into xml.etree package

[Stefan Behnel]

Change by Stefan Behnel :


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[issue36673] Comment/PI parsing support for ElementTree

[Stefan Behnel]

Change by Stefan Behnel :


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[issue30458] [security][CVE-2019-9740][CVE-2019-9947] HTTP Header Injection (follow-up of CVE-2016-5699)

[Gregory P. Smith]

Gregory P. Smith  added the comment:


New changeset b7378d77289c911ca6a0c0afaf513879002df7d5 by Gregory P. Smith in 
branch 'master':
bpo-30458: Use InvalidURL instead of ValueError. (GH-13044)
https://github.com/python/cpython/commit/b7378d77289c911ca6a0c0afaf513879002df7d5


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[issue34088] [EASY] sndhdr.what() throws exceptions on unknown files

[david awad]

david awad  added the comment:

It's been a while since then but I really think we can get this fix merged in 
the next two weeks or so. 

Can someone give this another look? 

I had a quick question for Serhiy Here: 
https://github.com/python/cpython/pull/8319#discussion_r273539593

If we could get that resolved I think this can finally be done and I can try to 
help out on a different PR and do a better job in the future. 


Thanks!

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[issue36759] datetime: astimezone() results in OSError: [Errno 22] Invalid argument

[Windson Yang]

Windson Yang  added the comment:

Thanks, SilentGhost, you are right. I will leave this to a Windows expert 
instead.

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[issue35864] Replace OrderedDict with regular dict in namedtuple's _asdict() method.

[Raymond Hettinger]

Change by Raymond Hettinger :


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[issue36018] Add a Normal Distribution class to the statistics module

[Raymond Hettinger]

Change by Raymond Hettinger :


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[issue36762] Teach "import *" to warn when overwriting globals or builtins

[Raymond Hettinger]

Raymond Hettinger  added the comment:

> What if existing globals are overwritten intentionally?

That's why it would be a warning instead of an error.  Also, with warnings we 
can suppress specific instances (by module or by message).

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[issue36757] uuid constructor accept invalid strings (extra dash)

[Windson Yang]

Windson Yang  added the comment:

> Maybe a line should be added in the documentation to prevent people using 
> this as a validator without more check?

I don't expect uuid.UUID could be used as a validator myself, but I agreed we 
can warn users in the documentation if lots of them confuse about it.

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[issue36772] Let lru_cache be used as a decorator with no arguments

[Raymond Hettinger]

New submission from Raymond Hettinger :

Follow the lead of the dataclasses module and allow lru_cache() to be used as a 
straight decorator rather than as a function that returns a decorator.  Both of 
these would now be supported:

@lru_cache
def f(x):
...

@lru_cache(maxsize=256)
def f(x):
...

--
components: Library (Lib)
messages: 341239
nosy: eric.smith, rhettinger, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Let lru_cache be used as a decorator with no arguments
type: behavior
versions: Python 3.8

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[issue36772] Let lru_cache be used as a decorator with no arguments

[Raymond Hettinger]

Change by Raymond Hettinger :


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[issue36018] Add a Normal Distribution class to the statistics module

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset 671d782f8dc52942dc8c48a513bf24ff8465b112 by Raymond Hettinger in 
branch 'master':
bpo-36018: Update example to show mean and stdev (GH-13047)
https://github.com/python/cpython/commit/671d782f8dc52942dc8c48a513bf24ff8465b112


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[issue36764] Types module doesn't have a type for _abc_data

[Inada Naoki]

Inada Naoki  added the comment:

You didn't explain why people not only you need it.
"Could you elaborate?"

Unless clear use cases, I'm strong -1 on adding it in typing module.

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[issue36761] Extended slice assignment + iterable unpacking

[Windson Yang]

Windson Yang  added the comment:

In your first case, *any positive index except 2 will work*, For example:

L = [0, 1, 2]
L[::1], *rest = "abcdef" # L became ['a']
or 
L[::3], *rest = "abcdef" # L became ['a', 1, 2]

I found iff when you change the length of L to 1(L[::3]) or didn't change L at 
all (L[::1], L[::]), this expression will work. But I'm not sure that is what 
you expected.

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[issue36762] Teach "import *" to warn when overwriting globals or builtins

[Windson Yang]

Windson Yang  added the comment:

Another question will be are we going to replace the * in our source code in 
the future? Since I found lots of our code use 'from xxx import *' pattern.

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[issue29512] regrtest refleak: implement bisection feature

[miss-islington]

Change by miss-islington :


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[issue29512] regrtest refleak: implement bisection feature

[miss-islington]

Change by miss-islington :


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[issue36763] PEP 587: Rework initialization API to prepare second version of the PEP

[STINNER Victor]

Change by STINNER Victor :


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[issue36763] PEP 587: Rework initialization API to prepare second version of the PEP

[STINNER Victor]

STINNER Victor  added the comment:


New changeset cb9fbd35885a8921b9df99e801df4f82e3ba336b by Victor Stinner in 
branch 'master':
bpo-36763: Make _PyCoreConfig.check_hash_pycs_mode public (GH-13052)
https://github.com/python/cpython/commit/cb9fbd35885a8921b9df99e801df4f82e3ba336b


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[issue1260171] subprocess: more general (non-buffering) communication

[Josiah Carlson]

Change by Josiah Carlson :


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[issue1191964] add non-blocking read and write methods to subprocess.Popen

[Josiah Carlson]

Josiah Carlson  added the comment:

Someone else can resurrect this concept and/ore patch if they care about this 
feature. Best of luck to future readers.

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

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[issue4277] asynchat's handle_error inconsistency

[Josiah Carlson]

Change by Josiah Carlson :


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[issue1442493] IDLE shell window gets very slow when displaying long lines

[Josiah Carlson]

Change by Josiah Carlson :


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[issue6911] Document changes in asynchat

[Josiah Carlson]

Change by Josiah Carlson :


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[issue13372] handle_close called twice in poll2

[Josiah Carlson]

Change by Josiah Carlson :


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[issue35913] asyncore: allow handling of half closed connections

[Josiah Carlson]

Change by Josiah Carlson :


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[issue1043134] Add preferred extensions for MIME types

[Josiah Carlson]

Change by Josiah Carlson :


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[issue13451] sched.py: speedup cancel() method

[Josiah Carlson]

Change by Josiah Carlson :


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[issue3783] dbm.sqlite proof of concept

[Josiah Carlson]

Change by Josiah Carlson :


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