[issue40897] Inheriting from class that defines __new__ causes inspect.signature to always return (*args, **kwargs) for constructor

[Mauricio Villegas]

Mauricio Villegas  added the comment:

I created another issue since the problem appears to be a bit different: 
https://bugs.python.org/issue44618

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[issue44608] Memory use increase in function _tkinter._flatten

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue44608] Memory use increase in function _tkinter._flatten

[miss-islington]

miss-islington  added the comment:


New changeset 94adfe6e2cdc9ba715b6d7068d8bd521ba6bf30b by Miss Islington (bot) 
in branch '3.9':
bpo-44608: Fix memory leak in _tkinter._flatten() (GH-27107)
https://github.com/python/cpython/commit/94adfe6e2cdc9ba715b6d7068d8bd521ba6bf30b


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[issue44633] Indexing the union type can return NotImplemented

[Serhiy Storchaka]

New submission from Serhiy Storchaka :

>>> import typing
>>> (int | typing.T)[1]
NotImplemented

It is related to issue44632.

--
components: Interpreter Core
messages: 397468
nosy: gvanrossum, kj, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Indexing the union type can return NotImplemented
type: behavior
versions: Python 3.10, Python 3.11

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[issue44608] Memory use increase in function _tkinter._flatten

[miss-islington]

miss-islington  added the comment:


New changeset 7e1d6308a3fc536719adcf1df0aa4e9953c12f8b by Miss Islington (bot) 
in branch '3.10':
bpo-44608: Fix memory leak in _tkinter._flatten() (GH-27107)
https://github.com/python/cpython/commit/7e1d6308a3fc536719adcf1df0aa4e9953c12f8b


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[issue44632] Union with TypeVar does not work as intended

[Serhiy Storchaka]

New submission from Serhiy Storchaka :

>>> import typing
>>> int | typing.T
int | ~T
>>> typing.T | int
typing.Union[~T, int]
>>> T2 = TypeVar('T2')
>>> int | T2
typing.Union[int, ~T2]
>>> T2 | int
typing.Union[~T2, int]

There is a support of TypeVar in type.__or__, but it does not work with user 
defined TypeVars, only with internal TypeVars defined in the typing module.

--
components: Interpreter Core
messages: 397466
nosy: gvanrossum, kj, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Union with TypeVar does not work as intended
type: behavior
versions: Python 3.10, Python 3.11

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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue44608] Memory use increase in function _tkinter._flatten

[miss-islington]

Change by miss-islington :


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[issue44608] Memory use increase in function _tkinter._flatten

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset f572cbf1faab33d9afbbe3e95738ed6fbe6e48e6 by Serhiy Storchaka in 
branch 'main':
bpo-44608: Fix memory leak in _tkinter._flatten() (GH-27107)
https://github.com/python/cpython/commit/f572cbf1faab33d9afbbe3e95738ed6fbe6e48e6


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[issue44608] Memory use increase in function _tkinter._flatten

[miss-islington]

Change by miss-islington :


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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[miss-islington]

miss-islington  added the comment:


New changeset b42eee78e7651693aa38c390f577e5d499dcf55d by Miss Islington (bot) 
in branch '3.10':
bpo-44606: Fix __instancecheck__ and __subclasscheck__ for the union type. 
(GH-27120)
https://github.com/python/cpython/commit/b42eee78e7651693aa38c390f577e5d499dcf55d


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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset 81989058de381108dfd0a4255b93d4fb34417002 by Serhiy Storchaka in 
branch 'main':
bpo-44606: Fix __instancecheck__ and __subclasscheck__ for the union type. 
(GH-27120)
https://github.com/python/cpython/commit/81989058de381108dfd0a4255b93d4fb34417002


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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[miss-islington]

Change by miss-islington :


--
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nosy_count: 3.0 -> 4.0
pull_requests: +25675
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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Jack DeVries]

Jack DeVries  added the comment:

I wonder if the middle ground here is to let it be a teachable moment, and to 
inform the user by having the string returned by __repr__ be a bit more 
descriptive. Currently, it is:

> Use exit() or Ctrl-Z plus Return to exit

I propose:

> exit is the function that closes Python when called. To call a Python 
> function, add parenthesis! For example, "exit()".

To share a personal anecdote, Python was my first programming language. I can 
remember this specific case of REPL-stubbornness being instrumental in teaching 
me about referencing versus calling a function. Special cases cause confusion, 
and a shortcut that removes two characters at the expense of skirting past an 
essential understanding is not the right choice. The place we should be *most* 
careful about breaking language idioms are in the spots that are exposed to 
beginners and newcomers to the language.

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Steven D'Aprano]

Steven D'Aprano  added the comment:

On Tue, Jul 13, 2021 at 01:58:30AM +, Taylor Alexander wrote:

> I would push back against the idea that this is about laziness. It 
> sounds like this is about reducing user confusion.

Users aren't *confused* by the instructions, which are clear and simple: 
call the object using parentheses. Nobody says that they don't 
understand what it means to "use exit() to exit".

They are *annoyed* that they have to type the parentheses. This is not 
confusion, and it is disengenious to claim that people are "confused".

Especially when people have said that they understand the technical 
reasons for why exit behaves as it does, and that makes them "more 
frustrated". So they understand the reasoning why having repr(exit) kill 
the interpreter is a bad idea, and rather than satisfying them, they get 
even more annoyed.

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[issue44589] Pattern Matching - duplicate keys in mapping patterns

[Jack DeVries]

Jack DeVries  added the comment:

@brandtbucher, I think that my PR implements the solution you've described 
here. What do you think?

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[issue44589] Pattern Matching - duplicate keys in mapping patterns

[Jack DeVries]

Change by Jack DeVries :


--
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nosy_count: 3.0 -> 4.0
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pull_request: https://github.com/python/cpython/pull/27131

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[issue44617] Undesired Behavior on `match` using Singleton object

[Dennis Sweeney]

Dennis Sweeney  added the comment:

>From https://www.python.org/dev/peps/pep-0635/#value-patterns :

"""We therefore only adopted the rule that any dotted name (i.e., attribute 
access) is to be interpreted as a value pattern, for example HttpStatus.OK 
above. This precludes, in particular, local variables and global variables 
defined in the current module from acting as constants."""

So your `case Nothing` example is an irrefutable capture pattern that binds the 
subject to the name "Nothing", while `case Maybe.empty` is a value pattern.

This is probably a little confusing the first time a person sees it, but it is 
in fact working in compliance with PEP 634, PEP 635, and PEP 636.

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Gregory P. Smith]

Gregory P. Smith  added the comment:

Agreed with Paul, this is a good idea UX wise for interactive interpreters.  
IPython proved that well over a decade ago.  Thanks for the historical links!

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[issue44617] Undesired Behavior on `match` using Singleton object

[Pablo Aguilar]

Pablo Aguilar  added the comment:

In fact, I'm worried about how to explain some behaviors.

Look here:
```python
# `Maybe` here is the same class described in the first message
Nothing = Maybe()
Maybe.empty = Nothing


if __name__ == '__main__':
my_maybe = Maybe()
match my_maybe:
case Nothing:
print('FIRST CASE')
case _:
print('DEFAULT CASE')
```

I can't use `Nothing` to match the values even though it's a variable but using 
`Maybe.empty` it works.

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[issue38278] Need a more efficient way to perform dict.get(key, default)

[Inada Naoki]

Change by Inada Naoki :


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[issue44617] Undesired Behavior on `match` using Singleton object

[Pablo Aguilar]

Pablo Aguilar  added the comment:

But, `Maybe.empty` works like a `Literal Pattern` or `Constant Pattern`?

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[issue44604] [Enhancement] Asyncio task decorator to provide interface to define async DAGs (similar to dask's delayed interface)

[Art]

Art  added the comment:

Hi Yury, could you by any chance point me to some material on the inclusion of 
task groups in 3.11? I've found these "task group" docs from a library called 
AnyIO: https://anyio.readthedocs.io/en/stable/tasks.html.

If the asyncio task group feature is similar to this, then while I think it is 
a nice inclusion, I believe it does not cover the use case that this proposal 
would cover.

* If your opinion on the matter is still not final, then would you be open to a 
further demonstration of this proposal? I could gather several use cases from 
SO and other sites and demo how they could be elegantly solved with this 
interface.

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Éric Araujo]

Change by Éric Araujo :


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nosy: +eric.araujo

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[issue44630] Assertion failure in csv module

[Gregory P. Smith]

Gregory P. Smith  added the comment:

Thanks!

Things like this both internal to CPython and in CPython API misuse in all 
sorts of third party extension modules are why i think we as a project really 
should to encourage more CI systems to have -UNDEBUG builds of CPython 
available and in use by default when people request Python...

To answer anyone's "why no news entry?" questions... This only shows up in 
-UNDEBUG (and thus pydebug) builds of CPython.  Which basically nobody uses.

We, Google, keep C assertions enabled by undefining NDEBUG in our default 
non-release builds that everything by default runs tests against as a way to 
help improve code quality.

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status: open -> closed

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[issue44630] Assertion failure in csv module

[miss-islington]

miss-islington  added the comment:


New changeset fe73509c5ba3844b45a2253967522531ab80c849 by Miss Islington (bot) 
in branch '3.9':
bpo-44630: Fix assertion errors in csv module (GH-27127)
https://github.com/python/cpython/commit/fe73509c5ba3844b45a2253967522531ab80c849


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[issue44630] Assertion failure in csv module

[miss-islington]

miss-islington  added the comment:


New changeset bb260c2a212aee2a7d7a32bf5208fd554bf72713 by Miss Islington (bot) 
in branch '3.10':
[3.10] bpo-44630: Fix assertion errors in csv module (GH-27127) (GH-27129)
https://github.com/python/cpython/commit/bb260c2a212aee2a7d7a32bf5208fd554bf72713


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[issue44630] Assertion failure in csv module

[miss-islington]

Change by miss-islington :


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[issue44630] Assertion failure in csv module

[miss-islington]

Change by miss-islington :


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[issue38278] Need a more efficient way to perform dict.get(key, default)

[Irit Katriel]

Irit Katriel  added the comment:

> Was LOAD_METHOD optimized for builtin methods?


Maybe this can be done with specialization.

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[issue44630] Assertion failure in csv module

[Gregory P. Smith]

Gregory P. Smith  added the comment:


New changeset 0093876328afa330224c9d887c18dee0b3117852 by T. Wouters in branch 
'main':
bpo-44630: Fix assertion errors in csv module (GH-27127)
https://github.com/python/cpython/commit/0093876328afa330224c9d887c18dee0b3117852


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[issue44604] [Enhancement] Asyncio task decorator to provide interface to define async DAGs (similar to dask's delayed interface)

[Yury Selivanov]

Yury Selivanov  added the comment:

Yeah, I'm also not convinced this has to be part of asyncio, especially since 
we'll likely have task groups in 3.11.

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[issue44631] Refactoring the repr() of the _Environ class (os module)

[Leonardo Freua]

Change by Leonardo Freua :


--
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[issue44631] Refactoring the repr() of the _Environ class (os module)

[Leonardo Freua]

New submission from Leonardo Freua :

Currently, the repr() code of the _Environ class does many things in a bunched 
way, making it difficult to read and difficult to determine the result returned 
by the method.

Therefore, I propose an adjustment in the code to make it more readable, as 
well as your test.

--
components: Library (Lib)
messages: 397448
nosy: Leonardofreua
priority: normal
severity: normal
status: open
title: Refactoring the repr() of the _Environ class (os module)
type: enhancement
versions: Python 3.10, Python 3.11, Python 3.6, Python 3.7, Python 3.8, Python 
3.9

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[issue44630] Assertion failure in csv module

[Thomas Wouters]

Change by Thomas Wouters :


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pull_request: https://github.com/python/cpython/pull/27127

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[issue44627] Python terminal cmd line recall

[Eryk Sun]

Eryk Sun  added the comment:

By default, reading input from the console uses the console's built-in 
command-line editor. You can clear the console input history with Alt+F7; 
display the history list with F7; navigate in the history list with the up and 
down arrow keys, even when the list isn't displayed; recall the first and last 
entries of the list with page up and page down; and cycle through matching 
command completions with F8.

Having said that, the new implementation of the console in Windows 10 has a bug 
in the "Discard Old Duplicates" history option [1]. Try disabling this option 
in the console's "Properties" dialog, which can be accessed from the Alt+Space 
control menu.

---
[1] https://github.com/microsoft/terminal/issues/4186

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[issue44630] Assertion failure in csv module

[Thomas Wouters]

New submission from Thomas Wouters :

The csv module has some incorrect exception handling when dealing with dialect 
objects that are not csv.Dialect subclasses (or that otherwise raise errors 
when accessing the dialect attributes):

>>> csv.reader([], dialect=None)
python: ../../cpython/Objects/typeobject.c:3820: _PyType_Lookup: Assertion 
`!PyErr_Occurred()' failed.
Aborted

The problem is Modules/_csv.c tries to cater to dialects that lack the 
attributes it wants to access, but does so by leaving exceptions set between 
calls to PyObject_SetAttrString(). Since 3.7, that causes assertion failures. 
(I have a PR with a fix.)

--
assignee: twouters
components: Extension Modules
messages: 397446
nosy: gregory.p.smith, twouters
priority: normal
severity: normal
status: open
title: Assertion failure in csv module
type: crash
versions: Python 3.10, Python 3.11, Python 3.9

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[issue33346] Syntax error with async generator inside dictionary comprehension

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 054e9c84ac7c394941bba3ea1829d14dce1243fc by Serhiy Storchaka in 
branch 'main':
bpo-33346: Allow async comprehensions inside implicit async comprehensions 
(GH-6766)
https://github.com/python/cpython/commit/054e9c84ac7c394941bba3ea1829d14dce1243fc


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[issue43950] Include column offsets for bytecode instructions

[Batuhan Taskaya]

Change by Batuhan Taskaya :


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[issue34388] collect_gdb fails for test.pythoninfo in several AMD64 FreeBSD buildbots

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue38842] test_multiprocessing_spawn altered the execution environment in AMD64 FreeBSD Non-Debug 3.x

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue37271] Make multiple passes of the peephole optimizer until bytecode cannot be optimized further

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue34292] test_compile hangs in AMD Ubuntu buildbots

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue44572] Calls to platform._syscmd_ver() dependent functions consume STDIN

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 425756abdc03263ab3a52b068befd1ddb16c2dd2 by Miss Islington (bot) 
in branch '3.10':
bpo-44572: On Windows, disconnect STDIN in platform._syscmd_ver() to prevent 
erroneous STDIN consumption (GH-27092) (GH-27124)
https://github.com/python/cpython/commit/425756abdc03263ab3a52b068befd1ddb16c2dd2


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[issue33125] Windows 10 ARM64 platform support

[Jay Swanson]

Jay Swanson  added the comment:

I know this is closed, but is it possible that the ARM64EC support coming in 
Windows 11 that allows mixed native/emulated code is something that would help 
this along? That along with the sunsetting of 32-bit systems.

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[issue43948] sysconfig's osx_framework_user puts headers in different locations from distutils

[Tzu-ping Chung]

Tzu-ping Chung  added the comment:

Personally I am not very surprised. The scenario (installing a package to the 
user scheme of a macOS Framework build) is quite obscure on its own, and AFAIK 
no third-party package installers is currently using sysconfig. Both pip and 
setuptools use distutils, and everything else uses one of them to perform the 
installation indirectly.

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[issue44629] Some files from distutils module are importing all exceptions unnecessarily

[Leonardo Freua]

New submission from Leonardo Freua :

Some files from the distutils module are importing all the exceptions from the 
errors.py file unnecessarily, when in fact only a few of the Exception classes 
are used.

Could I open a PR by fixing the files that are making these unnecessary 
imports? Or is this problem in the same category as f-String refactorings?

--
components: Library (Lib)
messages: 397441
nosy: Leonardofreua
priority: normal
severity: normal
status: open
title: Some files from distutils module are importing all exceptions 
unnecessarily
type: enhancement
versions: Python 3.10, Python 3.11, Python 3.9

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[issue44572] Calls to platform._syscmd_ver() dependent functions consume STDIN

[miss-islington]

Change by miss-islington :


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[issue44572] Calls to platform._syscmd_ver() dependent functions consume STDIN

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 5.0 -> 6.0
pull_requests: +25667
pull_request: https://github.com/python/cpython/pull/27124

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[issue12178] csv writer doesn't escape escapechar

[Sebastian Bank]

Sebastian Bank  added the comment:

Thanks Tal.

AFAICT there was an undocumented change in behaviour related to this fix.

Python 3.9 quotes values with escapechar:

```
import csv
import io

kwargs = {'escapechar': '\\'}

value = 'spam\\eggs'

print(value)

with io.StringIO() as buf:
writer = csv.writer(buf, **kwargs)
writer.writerow([value])
line = buf.getvalue()

print(line.strip())

with io.StringIO(line) as buf:
reader = csv.reader(buf, **kwargs)
(new_value,), = reader

print(new_value)
spam\eggs
"spam\eggs"
spameggs
```

- quotes escapechar
- fails to double the escapechar (this bug)

Btw, from
https://docs.python.org/3/library/csv.html#csv.QUOTE_MINIMAL

> only quote those fields which contain special characters
> such as delimiter, quotechar or any of the characters in lineterminator.

this seems incorrect because escapechar is not mentioned (but at the same time 
it says 'such as') and maybe better matching the name 'minimal' (or one might 
expect 'more' quoting as a better default).

Python 3.10:

https://github.com/python/cpython/blob/5c0eed7375fdd791cc5e19ceabfab4170ad44062/Lib/test/test_csv.py#L207-L208

See also https://github.com/xflr6/csv23/actions/runs/1027687524

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[issue44572] Calls to platform._syscmd_ver() dependent functions consume STDIN

[Steve Dower]

Steve Dower  added the comment:


New changeset 0ee0a740e12ec8568aafa033aa6bb08b265afe26 by Konstantin-Glukhov in 
branch 'main':
bpo-44572: On Windows, disconnect STDIN in platform._syscmd_ver() to prevent 
erroneous STDIN consumption (GH-27092)
https://github.com/python/cpython/commit/0ee0a740e12ec8568aafa033aa6bb08b265afe26


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[issue44626] Incorrect tracing of nested if/if/for/yield

[Sergey B Kirpichev]

Change by Sergey B Kirpichev :


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[issue44604] [Enhancement] Asyncio task decorator to provide interface to define async DAGs (similar to dask's delayed interface)

[Art]

Art  added the comment:

Note: regarding my inclusion of "airflow" in point #4 above. I in no way 
believe that airflow is a viable alternative to this proposal. I included it 
because one of those posts I linked explicitly mentioned that they looked into 
it as an alternative.

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[issue44628] Remove the broken link for issue #445902 in unixcompiler.py (distutils)

[Leonardo Freua]

Change by Leonardo Freua :


--
keywords: +patch
pull_requests: +25666
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/27121

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[issue44604] [Enhancement] Asyncio task decorator to provide interface to define async DAGs (similar to dask's delayed interface)

[Art]

Art  added the comment:

I understand the hesitation to add this to the library, however I'd like to 
make a case for why I believe that it fits. To start this is my understanding 
of the scope of asyncio (or at least part of the scope, taken from the asyncio 
docs):

asyncio provides a set of high-level APIs to:
- run Python coroutines concurrently and have full control over their execution;
- perform network IO and IPC;
- control subprocesses;
- distribute tasks via queues;
- synchronize concurrent code;

I believe this decorator would be another high-level api that would be 
considered a valid, useful, simple, and if it was more well-known, popular, 
method of exerting "full control over their execution".

Here's an example of a few places from around the internet where people are 
asking how to do something that would directly benefit from this API, and where 
I believe frankly that this API would provide a much cleaner/better solution 
than those proposed.

https://old.reddit.com/r/learnpython/comments/oi3ueo/how_do_you_use_asyncio_to_do_this/
(inspiration for demo solution provided above)
https://stackoverflow.com/questions/58581270/what-is-the-cleanest-way-to-write-and-run-a-dag-of-tasks
(user specifies their tasks are IO bound and that they tried to use 
asyncio, but to no avail, or it was too complicated)

In both these cases above, it is explicitly implied that the user tried to use 
asyncio to solve their problem, but could not find a satisfactory way to do so.

Here's a few more examples of asyncio code, that aren't as directly related to 
the issue at hand, but would greatly benefit from this isolated "task" 
structure.

https://stackoverflow.com/questions/58905515/how-to-ensure-python-s-asyncio-library-executes-tasks-in-depth-first-search-orde
(user trying to build/execute a DAG of async tasks)
https://stackoverflow.com/questions/67481509/how-should-i-design-a-concurrency-pipeline-with-asyncio
(user could/should consider their task pipeline as a DAG which would 
conceptually simplify what they are trying to achieve)

To directly address the concern of "why add this to asyncio, and not a 
third-party library".
1) I believe this falls into the scope of the library as demonstrated in the 
first paragraph of this comment
2) Users look to and trust asyncio to provide good high level apis to build 
better code/systems (As you can see from some of the examples I posted above)
3) This is a very simple high-level api, that will not interfere with anything 
else in the library. Will introduce no compatibility issues
4) This point is conjecture, but I believe that this api will keep users from 
unnecessarily moving their workflows to other libraries like dask (which I love 
and contribute too) or airflow as you can see from some of the examples where 
users claim to try other libraries for something that asyncio could easily 
handle.
5) Inclusion in asyncio (over a third-party library) would provide faster, more 
reputable exposure to users of a great method of thinking about/solving their 
problems.

I hope you'll re-consider your position, but completely understand if not, in 
which case I'll close this issue.

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[issue44628] Remove the broken link for issue #445902 in unixcompiler.py (distutils)

[Leonardo Freua]

New submission from Leonardo Freua :

There is a broken link in the docstring of the runtime_library_dir_option() 
method of the UnixCCompiler class.

See the broken link below:
http://sourceforge.net/tracker/index.php?func=detail&aid=445902&group_id=5470&atid=105470

And the link that is working for this same issue:
https://bugs.python.org/issue445902

I will send a PR removing the link, leaving without it, as there is already 
exists the issue ID in the docstring.

--
components: Library (Lib)
messages: 397436
nosy: Leonardofreua
priority: normal
severity: normal
status: open
title: Remove the broken link for issue #445902 in unixcompiler.py (distutils)
versions: Python 3.11

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[issue44627] Python terminal cmd line recall

[jg]

New submission from jg :

Command line recall in python terminal treats strings case insensitively.

Example:
Define a 'dummy' function that takes a string as input. If you run dummy twice 
with the same input string, but different cases, it only saves one.
>>> dummy("This is a test") # run this
>>> dummy("THIS IS A TEST") # run again w/ different string
Now if you try cmd recall, it only recalls the first.
I believe it should recall both.
Maybe it's treating one as a duplicate - erroneously?

--
components: Windows
messages: 397435
nosy: jggammon, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Python terminal cmd line recall
type: behavior
versions: Python 3.9

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[issue44626] Incorrect tracing of nested if/if/for/yield

[Ned Batchelder]

New submission from Ned Batchelder :

In Python 3.10, this code is traced incorrectly. I don't know if there's a 
simpler format that would show the problem. This code is already simplified 
from https://github.com/nedbat/coveragepy/issues/1188.

--
import linecache, sys

def trace(frame, event, arg):
# The weird globals here is to avoid a NameError on shutdown...
if frame.f_code.co_filename == globals().get("__file__"):
lineno = frame.f_lineno
print("{} {}: {}".format(event[:4], lineno, linecache.getline(__file__, 
lineno).rstrip()))
return trace

print(sys.version)
sys.settrace(trace)

def f(a, p, z):
if p:
print(f"{a=}")
if a:
if z:
for x in [1,2]:
yield x
else:
for x in [1,2]:
yield x
else:
print("nope")

import itertools

for a, p, z in itertools.product([0, 1], repeat=3):
list(f(a, p, z))


Running this with 3.10.0b4 produces this output. The starred lines show a is 
false, but tracing then indicates a line which is not executed:

  3.10.0b4 (default, Jul 11 2021, 13:51:53) [Clang 12.0.0 (clang-1200.0.32.29)]
  call 13: def f(a, p, z):
  line 14: if p:
  line 24: print("nope")
  nope
  retu 24: print("nope")
  call 13: def f(a, p, z):
  line 14: if p:
  line 24: print("nope")
  nope
  retu 24: print("nope")
  call 13: def f(a, p, z):
  line 14: if p:
  line 15: print(f"{a=}")
  a=0
* line 16: if a:
  line 22: yield x
  retu 22: yield x
  call 13: def f(a, p, z):
  line 14: if p:
  line 15: print(f"{a=}")
  a=0
* line 16: if a:
  line 22: yield x
  retu 22: yield x
  call 13: def f(a, p, z):
  line 14: if p:
  line 24: print("nope")
  nope
  retu 24: print("nope")
  call 13: def f(a, p, z):
  line 14: if p:
  line 24: print("nope")
  nope
  retu 24: print("nope")
  call 13: def f(a, p, z):
  line 14: if p:
  line 15: print(f"{a=}")
  a=1
  line 16: if a:
  line 17: if z:
  line 21: for x in [1,2]:
  line 22: yield x
  retu 22: yield x
  call 22: yield x
  line 21: for x in [1,2]:
  line 22: yield x
  retu 22: yield x
  call 22: yield x
  line 21: for x in [1,2]:
  line 22: yield x
  retu 22: yield x
  call 13: def f(a, p, z):
  line 14: if p:
  line 15: print(f"{a=}")
  a=1
  line 16: if a:
  line 17: if z:
  line 18: for x in [1,2]:
  line 19: yield x
  retu 19: yield x
  call 19: yield x
  line 18: for x in [1,2]:
  line 19: yield x
  retu 19: yield x
  call 19: yield x
  line 18: for x in [1,2]:
  retu 18: for x in [1,2]:

--
components: Interpreter Core
keywords: 3.10regression
messages: 397434
nosy: Mark.Shannon, nedbat
priority: normal
severity: normal
status: open
title: Incorrect tracing of nested if/if/for/yield
type: behavior
versions: Python 3.10

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[issue43124] [security] smtplib multiple CRLF injection

[Martin Ortner]

Martin Ortner  added the comment:

> This bug report starts with "a malicious user with direct access to 
> `smtplib.SMTP(..., local_hostname, ..)", which is a senseless supposition.  
> Anyone with "access to" the SMTP object could just as well be talking 
> directly to the SMTP server and do anything they want that SMTP itself allows.

Let's not argue about the phrasing and settle on the fact that I am not a 
native English speaker which might be the root cause of the confusion. The core 
of the issue is that this *unexpected side-effect* may be security-relevant. 
Fixing it probably takes less time than arguing about phrasing, severity, or 
spending time describing exploitation scenarios for a general-purpose library 
that should protect the underlying protocol from injections. 


Be kind, I come in peace.

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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Ken Jin]

Ken Jin  added the comment:

> 3. There is also a crash in isinstance():

That's unfortunate :(.

Serhiy, thanks for catching all these bugs in union. I recently realized you 
probably made 50% of all bug reports for union and they're very much 
appreciated :).

> Converting None to type(None) will be done in other PR.

Alright. Do tell me if you're too busy and want me to take it up instead. I'll 
be glad to help.

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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

PR 27120 fixes __instancecheck__ and __subclasscheck__. Converting None to 
type(None) will be done in other PR.

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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
type: behavior -> crash

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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
keywords: +patch
pull_requests: +25665
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/27120

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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

3. There is also a crash in isinstance():

>>> class BadMeta(type):
... def __instancecheck__(cls, inst):
... 1/0
... 
>>> x = int | BadMeta('A', (), {})
>>> isinstance([], x)
Fatal Python error: _Py_CheckFunctionResult: a function returned a result with 
an exception set
Python runtime state: initialized
Traceback (most recent call last):
  File "", line 3, in __instancecheck__
ZeroDivisionError: division by zero

The above exception was the direct cause of the following exception:

SystemError:  returned a result with an exception set

Current thread 0x7f024beb1280 (most recent call first):
  File "", line 1 in 
Aborted (core dumped)

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[issue44625] Python C API version of `fractions` module

[Mark Dickinson]

Mark Dickinson  added the comment:

No, no plans. There are tradeoffs here - the extra speed comes at the expense 
of increased maintenance burden. (It's certainly much harder to make minor 
changes and fixes to the decimal module now that it's written in C.)

--
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[issue43950] Include column offsets for bytecode instructions

[Batuhan Taskaya]

Change by Batuhan Taskaya :


--
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pull_request: https://github.com/python/cpython/pull/27117

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[issue44604] [Enhancement] Asyncio task decorator to provide interface to define async DAGs (similar to dask's delayed interface)

[Andrew Svetlov]

Andrew Svetlov  added the comment:

I'm not convinced why @task decorator should be a part of asyncio.

You can provide the implementation as a part of some third-party library on 
pypy.org. Looks like it doesn't require any change of asyncio itself.

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Paul Ganssle]

Change by Paul Ganssle :


--
stage: resolved -> 

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Paul Ganssle]

Paul Ganssle  added the comment:

Re-opening this because I think the discussion is not done and I don't see any 
reason why this was rejected.

> Related 2005 python-dev discussion: 
> https://mail.python.org/archives/list/python-...@python.org/thread/VNGY2DLML4QJUXE73JLVBIH5WFBZNIKG/

@Mark Thanks for digging these up! From what I can tell, that discussion ended 
up with a combination of there not being quite enough enthusiasm for the idea 
to drive it forward and no one coming up with a good way to localize the effect 
to just the case where we know the person was trying to type "exit" in a REPL.

I think Pablo's patch shows that a very limited addition to the "REPL layer" is 
actually plausible, and we *could* implement this without taking on an enormous 
amount of additional complexity or affecting non-interactive use cases.

Fernando's point about it being dangerous to generalize this additional layer 
of "interactive-use only" keywords is a good one (see: 
https://mail.python.org/archives/list/python-...@python.org/message/L37RD7SG26IOBETPI7TETKFGHPAPC75Q/),
 though it seems that it was this thread that prompted him to add exit/quit as 
auto-call magic keywords to IPython, and I think that has worked out in the 
intervening 16 years. I don't think there's much danger of us wanting to 
generalize this concept, since the only really compelling argument for doing it 
this way for exit/quit is that almost everyone seems to think it *should* work 
this way (despite it never having worked this way, and there not being any 
equivalents), and gets tripped up when it doesn't.

> and the related issue: https://bugs.python.org/issue1446372

Looks to me like that is an issue for adding the message when you type "exit". 
There's no additional discussion disqualifying the use of "exit" as an 
interactive-only keyword.

--
resolution: rejected -> 
status: closed -> open

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[issue44623] help(open('/dev/zero').writelines) gives no help

[Zachary Ware]

Change by Zachary Ware :


--
versions: +Python 3.6 -Python 3.11

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[issue44623] help(open('/dev/zero').writelines) gives no help

[Zachary Ware]

Zachary Ware  added the comment:

Even with 3.6 I get a different result:

```
Python 3.6.13 (tags/v3.6.13:aa73e1722e, Mar 23 2021, 15:45:49) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> help(open('/dev/zero').writelines)
Help on built-in function writelines:

writelines(lines, /) method of _io.TextIOWrapper instance

```

This appears to be because TextIOWrapper.writelines just didn't have a 
docstring in 3.6.  I can't explain why `help` just gave you the repr of the 
method, though.

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

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Mark Dickinson]

Mark Dickinson  added the comment:

and the related issue: https://bugs.python.org/issue1446372

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[issue44625] Python C API version of `fractions` module

[Azat Ibrakov]

New submission from Azat Ibrakov :

Are there any plans for implementing `fractions` module in C (like  for 
`decimal` there is a 
https://github.com/python/cpython/blob/main/Modules/_decimal/_decimal.c module)?
I've implemented one myself (https://github.com/lycantropos/cfractions) and 
from benchmarks (available at https://stackoverflow.com/a/67821911/5997596) we 
can see that it can be faster that current pure Python implementation.

--
messages: 397424
nosy: lycantropos
priority: normal
severity: normal
status: open
title: Python C API version of `fractions` module

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[issue44624] Script name for venv PowerShell activate

[Ammar Askar]

Change by Ammar Askar :


--
nosy: +paul.moore, steve.dower, tim.golden, zach.ware

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[issue43124] [security] smtplib multiple CRLF injection

[R. David Murray]

R. David Murray  added the comment:

s/header injection/command injection/

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Mark Dickinson]

Mark Dickinson  added the comment:

Related 2005 python-dev discussion: 
https://mail.python.org/archives/list/python-...@python.org/thread/VNGY2DLML4QJUXE73JLVBIH5WFBZNIKG/

--
nosy: +mark.dickinson

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[issue43124] [security] smtplib multiple CRLF injection

[R. David Murray]

R. David Murray  added the comment:

This bug report starts with "a malicious user with direct access to 
`smtplib.SMTP(..., local_hostname, ..)", which is a senseless supposition.  
Anyone with "access to" the SMTP object could just as well be talking directly 
to the SMTP server and do anything they want that SMTP itself allows.

The concern here is that data a program might obtain *from unsanitized user 
input* could be used to do header injection.  The "proof of concept" does not 
address this at all.  We'd need to see a scenario under which data that could 
reasonably be derived from user input ends up being passed as arguments to an 
smtplib method that calls putcmd with arguments.

So, I would rate this as *very* low impact issue, unless someone has an *actual 
example* of code using smtplib that passes user input through to smtplib 
commands in an exploitable way.

That said, it is perfectly reasonable to be proactive here and prevent 
scenarios we haven't yet thought of, by doing as recommended (and a bit more) 
by raising a ValueError if 'args' in the putcmd call contain either \n or \r 
characters.  I don't think we need to check 'cmd', because I can't see any 
scenario in which the SMTP command would be derived from user input.  If you 
want to be *really* paranoid you could check cmd too, and since it will always 
be a short string the additional performance impact will be minor.

--
type: performance -> security
versions: +Python 3.10, Python 3.11, Python 3.6, Python 3.7, Python 3.8, Python 
3.9

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[issue44623] help(open('/dev/zero').writelines) gives no help

[Jonathan Fine]

Jonathan Fine  added the comment:

I used my default Python, which is Python 3.6. However, with 3.7 and 3.8 I get 
the same as Paul.

So I'm closing this as 'not a bug' (as there's not an already-fixed option for 
closing).

--
resolution: works for me -> not a bug
status: pending -> open

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[issue44623] help(open('/dev/zero').writelines) gives no help

[Zachary Ware]

Zachary Ware  added the comment:

I also can't reproduce this with a fresh build of 3b5b99da4b on Linux.

--
nosy: +zach.ware
resolution:  -> works for me
status: open -> pending

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[issue19072] classmethod doesn't honour descriptor protocol of wrapped callable

[Łukasz Langa]

Change by Łukasz Langa :


--
nosy: +lukasz.langa
nosy_count: 11.0 -> 12.0
pull_requests: +25663
pull_request: https://github.com/python/cpython/pull/27115

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[issue42073] classmethod does not pass "type/owner" when invoking wrapped __get__

[Łukasz Langa]

Change by Łukasz Langa :


--
nosy: +lukasz.langa
nosy_count: 4.0 -> 5.0
pull_requests: +25662
pull_request: https://github.com/python/cpython/pull/27115

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[issue44355] Allow spaces in format strings

[Jean Abou Samra]

Jean Abou Samra  added the comment:

Maybe leave the current state, keeping backwards compatibility, but improve the 
error message by adding "perhaps you wanted no spaces in the format field?" 
when the_field.replace(" ", "") would be valid?

--
nosy: +Jean_Abou_Samra

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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Ken Jin]

Ken Jin  added the comment:

@Serhiy, can I work on converting None to type(None) please?

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[issue44624] Script name for venv PowerShell activate

[Paul Watson]

New submission from Paul Watson :

In the venv .\Scripts directory. the name 'Activate.ps1' does not conform to 
the PowerShell prescribed Verb-Noun format.

How about using 'Initialize-Python.ps1' as the script name? Or, something else 
that does conform to PowerShell standard naming.

--
components: Installation
messages: 397416
nosy: Paul Watson
priority: normal
severity: normal
status: open
title: Script name for venv PowerShell activate
type: enhancement

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[issue44623] help(open('/dev/zero').writelines) gives no help

[Paul Moore]

Paul Moore  added the comment:

It does for me:

>>> help(open("nul").writelines)
Help on built-in function writelines:

writelines(lines, /) method of _io.TextIOWrapper instance
Write a list of lines to stream.

Line separators are not added, so it is usual for each of the
lines provided to have a line separator at the end.

This is Windows, Python 3.9. What version did you get the problem with? If it's 
older, I'd say the problem has likely since been fixed.

--
nosy: +paul.moore

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[issue44623] help(open('/dev/zero').writelines) gives no help

[Jonathan Fine]

New submission from Jonathan Fine :

On Linux
>>> help(open('/dev/zero').writelines)
gives


However
https://docs.python.org/3/library/io.html#io.IOBase.writelines
gives

Write a list of lines to the stream. Line separators are not added, so it is 
usual for each of the lines provided to have a line separator at the end.

See also request that writelines support a line separator.
https://mail.python.org/archives/list/python-id...@python.org/thread/A5FT7SVZBYAJJTIWQFTFUGNSKMVQNPVF/#A5FT7SVZBYAJJTIWQFTFUGNSKMVQNPVF

--
assignee: docs@python
components: Documentation
messages: 397414
nosy: docs@python, jfine2358
priority: normal
severity: normal
status: open
title: help(open('/dev/zero').writelines) gives no help
type: enhancement
versions: Python 3.11

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[issue43126] IOBase.readlines(0) behaviour is inconsistent with documentation

[Łukasz Langa]

Łukasz Langa  added the comment:

Thanks, Andrei! ✨ 🍰 ✨

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[issue43126] IOBase.readlines(0) behaviour is inconsistent with documentation

[Łukasz Langa]

Change by Łukasz Langa :


--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.10, Python 3.11

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[issue43126] IOBase.readlines(0) behaviour is inconsistent with documentation

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset a3d20bfee38c71df88d69064d47fe98a1d59e624 by Miss Islington (bot) 
in branch '3.9':
bpo-43126: Expand docs on io.IOBase.readlines() method (GH-27061) (#27114)
https://github.com/python/cpython/commit/a3d20bfee38c71df88d69064d47fe98a1d59e624


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[issue43126] IOBase.readlines(0) behaviour is inconsistent with documentation

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset 9b369c952cbefb064dda6cb781e66cc1b793fffa by Miss Islington (bot) 
in branch '3.10':
bpo-43126: Expand docs on io.IOBase.readlines() method (GH-27061) (GH-27113)
https://github.com/python/cpython/commit/9b369c952cbefb064dda6cb781e66cc1b793fffa


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[issue38741] Definition of multiple ']' in header configparser

[Łukasz Langa]

Łukasz Langa  added the comment:

Since I got to this only now, we can include the fix in main (3.11) and 3.10. 
It's too late in the cycle for 3.9.

--
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.11 -Python 3.9

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[issue44514] configparser.rst & bz2.rst leave temp files after 'make doctest'

[Łukasz Langa]

Łukasz Langa  added the comment:

Thanks, Kevin! ✨ 🍰 ✨

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[issue38741] Definition of multiple ']' in header configparser

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset 1cc6769e4146951d47528a97e56ba1e8e9ee7fc1 by Miss Islington (bot) 
in branch '3.10':
bpo-38741: Definition of multiple ']' in header configparser (GH-17129) (#27110)
https://github.com/python/cpython/commit/1cc6769e4146951d47528a97e56ba1e8e9ee7fc1


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[issue44514] configparser.rst & bz2.rst leave temp files after 'make doctest'

[Łukasz Langa]

Change by Łukasz Langa :


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

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[issue44514] configparser.rst & bz2.rst leave temp files after 'make doctest'

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset f514addfbc637a42549ddc422b35b6caad2a4363 by Miss Islington (bot) 
in branch '3.10':
bpo-44514: Add doctest testcleanup for configparser and bz2 (GH-26909) 
(GH-27112)
https://github.com/python/cpython/commit/f514addfbc637a42549ddc422b35b6caad2a4363


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[issue44514] configparser.rst & bz2.rst leave temp files after 'make doctest'

[Łukasz Langa]

Łukasz Langa  added the comment:


New changeset 105e6cd67cc793c971b3e83daa87d36516fcba28 by Miss Islington (bot) 
in branch '3.9':
bpo-44514: Add doctest testcleanup for configparser and bz2 (GH-26909) (#27111)
https://github.com/python/cpython/commit/105e6cd67cc793c971b3e83daa87d36516fcba28


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[issue44606] Discrepancy between isinstance() and issubclass() for union types

[Guido van Rossum]

Guido van Rossum  added the comment:

Converting None to type(None) is fine, as long as the str() /repr()
converts it back, e.g. repr(int | None) should print just that, not
NoneType.--
--Guido (mobile)

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Paul Ganssle]

Paul Ganssle  added the comment:

At this point I think we should probably start a thread on python-dev to see 
how people feel about it. I'd be happy to author or co-author a PEP for this if 
need be.

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[issue44603] REPL: exit when the user types exit instead of asking them to explicitly type exit()

[Paul Ganssle]

Paul Ganssle  added the comment:

> In fact, you're proposing to use exit as a keyword, but lying about it to the 
> users. If it were really so important, then it _should_ be a keyword, and at 
> least I'd know that I can't use it for my variables anymore. (It's not the 
> first time such a thing would happen. The same thing happened with `async` a 
> few years ago.) But please don't introduce those "keywords just in a 
> particular context", they are horrible from the perspective of usability.

We already have so-called "soft keywords", e.g. `match`, so the horse is out of 
the barn at this point.

I'm not sure why this is closed as rejected — I don't see any decision one way 
or the other in this thread or on the PR, did I miss it?

I am struggling to understand how this is a user-hostile change; it is not 
unreasonable for a REPL to have some commands for interacting with the REPL 
which are not Python functions. I have accidentally typed `exit` instead of 
`exit()` many times, and one of the reasons I and many others like IPython is 
that `exit` exits the REPL. It has never once caused a problem for me, as far 
as I can tell. I cannot imagine that it is a common scenario for someone to 
type "exit" in order to inspect the "exit" object — it doesn't even have a 
useful repr!

The only reason you'd do this would be if you knew what it does and were 
demonstrating it, or if you were exploring what the various builtins are (which 
I think is very rare, and you'd probably only have to learn that lesson once).

Vedran's point, however, that you could do `exit = some_func()` and then type 
`exit` to try and inspect the `exit` object is a solid one. That said, I think 
we can get around this fairly easily (albeit with the cost of some additional 
complexity in the "handle the exit keyword" function) — if there's a single AST 
node that is a name and the name is "exit" or "quit", the REPL inspects locals 
and globals to see if the object referred to is a Quitter, and if so it exits, 
otherwise pass through the command as normal (possibly raising a warning like, 
"Did you mean to exit? You have shadowed the `exit` builtin, so use 
Ctrl-Z/Ctrl-D to exit or delete your `exit` object and try again").

I understand the arguments for purity and explicability and I'm often one of 
the first people to argue for keeping things consistent and understandable, but 
this is one of those things where we could significantly improve user 
experience for no practical cost. We can identify with very high certainty the 
situations in which a user intended to exit the REPL, we should go ahead and do 
it to provide a more intuitive REPL experience.

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