[issue39375] Document os.environ[x] = y and os.putenv() as thread unsafe

[Gregory P. Smith]

Gregory P. Smith  added the comment:

fwiw, no need to remove that message.  We'll want to make the docs clear that 
this does not apply to Windows.  :)

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[issue39416] Document default numeric string formats

[Eric V. Smith]

Eric V. Smith  added the comment:

Is the lack of this documentation causing some confusion somewhere? This isn't 
rhetorical, I'm genuinely curious what problem you're trying to solve.

Is there any mainstream programming language where the basics of what you've 
laid out aren't true? It all seems pretty obvious to me. For example, I can't 
see anyone looking at this and saying "Ah, base 10. That's why it's producing 
the output I'm seeing."

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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[Dong-hee Na]

Dong-hee Na  added the comment:

Thank you to all who participated in this discussion and review :)

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[issue18842] Add float.is_finite is_nan is_infinite to match Decimal methods

[Dong-hee Na]

Dong-hee Na  added the comment:

rm-finite.patch was applied by bpo-39415.

> Once that's merged, let's close this issue as rejected.

I close this issue to a rejected state as discussed above.
Thank you to all who participated in this discussion.

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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[miss-islington]

miss-islington  added the comment:


New changeset a755410e054e1e2390de5830befc08fe80706c66 by Miss Islington (bot) 
in branch '3.8':
closes bpo-39415: Remove unused codes from longobject.c complexobject.c 
floatobject.c. (GH-18105)
https://github.com/python/cpython/commit/a755410e054e1e2390de5830befc08fe80706c66


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[issue39406] Implement os.putenv() with setenv() if available

[Eryk Sun]

Eryk Sun  added the comment:

> Python can safely removes the string to _putenv() just after the call? 

Windows ucrt copies the buffer that's passed to _[w]putenv. This makes it 
non-compliant with POSIX but easier to use in this case. Here's an example 
using ctypes:

>>> ucrt = ctypes.CDLL('ucrtbase')
>>> buf = ctypes.create_unicode_buffer('spam=eggs')
>>> ucrt._wputenv(buf)
0

Directly modifying the buffer has no effect on the _wgetenv result:

>>> buf[5] = 'a'
>>> ucrt._wgetenv.restype = ctypes.POINTER(ctypes.c_wchar)
>>> ucrt._wgetenv('spam')[:4]
'eggs'

Linux putenv complies with POSIX, so changing "eggs" to "aggs" in the buffer 
does affect the getenv result in Linux. 

On the other hand, ucrt's [_w]getenv does not copy the environment string. For 
example:

>>> p1 = ucrt._wgetenv('spam')
>>> p1[0] = 'o'

>>> p2 = ucrt._wgetenv('spam')
>>> p2[:4]
'oggs'

[_w]getenv is not thread safe. Even though all calls that access the ucrt 
environment are internally synchronized on a common lock, accessing the 
*result* from [_w]getenv still needs to be synchronized with concurrent 
_[w]putenv calls in a multithreaded process. Better still, use [_w]getenv_s or 
_[w]dupenv_s, which returns a copy.

> There is also _wputenv_s which affects _spawn, _exec and system.

The documentation is perhaps misleading. When a variable is set with 
_[w]putenv[_s], it also sets the variable in the process environment block to 
stay in sync. This indirectly affects _spawn*, _exec* and system(). 
common_spawnv (in ucrt\exec\spawnv.cpp), which implements the latter functions, 
calls CreateProcess with lpEnvironment as NULL (i.e.  inherit the current 
process environment), unless the caller passes a new environment (e.g. envp of 
spawnve).

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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[miss-islington]

Change by miss-islington :


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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset 0d5eac8c327251f8edde5261cee43975d81311f6 by Benjamin Peterson 
(Dong-hee Na) in branch 'master':
closes bpo-39415: Remove unused codes from longobject.c complexobject.c 
floatobject.c. (GH-18105)
https://github.com/python/cpython/commit/0d5eac8c327251f8edde5261cee43975d81311f6


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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[miss-islington]

Change by miss-islington :


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[issue39416] Document default numeric string formats

[Karl O. Pinc]

Change by Karl O. Pinc :


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[issue39408] Add support for SQLCipher

[Benjamin Peterson]

Benjamin Peterson  added the comment:

It might help if you show the change you actually propose.

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[issue39416] Document default numeric string formats

[Karl O. Pinc]

New submission from Karl O. Pinc :

Seems sane to put _some_ restrictions on the string representations of the 
Numeric classes.  This would be a change to the Python language
specification.

Suggestions made in a pull request.

See the email thread:
Subject: Documenting Python's float.__str__()
https://mail.python.org/archives/list/python-...@python.org/thread/FV22TKT3S2Q3P7PNN6MCXI6IX3HRRNAL/

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title: Document default numeric string formats

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[issue18819] tarfile fills devmajor and devminor fields even for non-devices

[Ethan Furman]

Ethan Furman  added the comment:

Thanks for moving this issue forward, William!

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[issue39411] pyclbr rewrite using AST

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Nice.  A few notes.

Docs: The initial doc paragraph now has 'module browser' rather than 'class 
browser'.  The change is needed 2 other places.  Could be part of this PR or 
another one.
* Chapter title: "Python class browser support".  The only instance of 'class 
browser' in the chapter.
* Module index: "Supports information extraction for a Python class browser."

Possible API changes based on IDLE module browser experience:

1. IDLE filters out the import nodes.  It would be nicer to not have to delete 
them by passing something like 'imports=False' (with True being the default for 
back compatibility).

2. With nested classes and functions added, the returned object is almost a 
tree of nodes, except that what should be the top 'Module' node is instead what 
should be its children dict.  This un-uniformity gets in the way of recursively 
processing the tree.

3. If there were a function that returned a Module node with its path and name, 
the same could be removed from all children except for new ImpClass nodes 
representing imported classes when imports=True.  Since users know the module 
passed to pyclbr, this might be true even without Module nodes.

4. If a user immediately inserts nodes into a tree widget, then the user may 
only need a iterator of minimal nodes (name, parent, startline).  This is 
enough when using tkinter.ttk.Treeview.   I have thought of doing this for IDLE 
by either simplifying a copy of the pyclbr code or traversing the AST, as the 
PR here does.  This would let top-level items appear in the widget as they are 
scanned instead of waiting until scanning is complete.

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[issue39375] Document os.environ[x] = y and os.putenv() as thread unsafe

[Eryk Sun]

Change by Eryk Sun :


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[issue31405] shutil.which doesn't find files without PATHEXT extension on Windows

[Anthony Sottile]

Anthony Sottile  added the comment:

should I open a new issue for this, or is this an appropriate task to add to 
this discussion

shutil.which also doesn't apply `PATHEXT` when the path contains a directory 
separator

C:\Users\IEUser\astpretty>venv\Scripts\python --version
Python 3.7.5

C:\Users\IEUser\astpretty>venv\Scripts\python -c "import shutil; 
print(repr(shutil.which(r'venv\Scripts\python')))"
None

C:\Users\IEUser\astpretty>venv\Scripts\python -c "import shutil; 
print(repr(shutil.which(r'venv\Scripts\python.exe')))"
'venv\\Scripts\\python.exe'

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[issue39408] Add support for SQLCipher

[Sebastian Noack]

Sebastian Noack  added the comment:

Yes, I could use LD_LIBRARY_PATH (after copying /usr/lib/libsqlcipher.so.0 to 
/some/folder/libsqlite3.so), or alternatively LD_PRELOAD, and the sqlite3 
stdlib module will just work as-is with SQLCipher. The latter is in fact what 
I'm doing at the moment, but this is quite a hack, and it's not portable to 
macOS or Windows.

Alternatively, I could fork the sqlite3 stdlib module, have it built against 
SQLCipher, and redistribute it. But I'd rather not go there.

That's why I'd love to see built-in support for SQLCipher in upstream Python, 
and as it is a drop-in replacement for SQLite3 which the stdlib already comes 
with bindings for, it seems to be a fairly small change on your end.

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[issue39390] shutil.copytree - 3.8 changed argument types of the ignore callback

[Giampaolo Rodola']

Change by Giampaolo Rodola' :


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[issue39390] shutil.copytree - 3.8 changed argument types of the ignore callback

[Giampaolo Rodola']

Giampaolo Rodola'  added the comment:

Yes, thanks. Whoever got bit by this is either getting an exception or not the 
intended behavior (due to failed string comparison). I doubt anybody is relying 
on the new type checking since it's not documented. If they are, they are 
probably just doing:

def callback(name, names):
if not isinstance(name, str):  # bugfix 3.8
name = name.name
...

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[issue1812] doctest _load_testfile function -- newline handling seems incorrect

[Peter Donis]

Peter Donis  added the comment:

Pinging as a reminder that there is a pull request for this issue awaiting 
review.

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[issue39390] shutil.copytree - 3.8 changed argument types of the ignore callback

[Manuel Barkhau]

Manuel Barkhau  added the comment:

Unless somebody else wants to, I could have a go at an PR to update shutil.py

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[issue37444] Differing exception between builtins and importlib when importing beyond top-level package

[Miro Hrončok]

Miro Hrončok  added the comment:

I know that raising a DeprecationWarning here is most likely not possible or 
too black-magical to do. My intention was not to be harsh, sorry about that. I 
just wanted to point out that a backwards incompatible behavior like this 
without a (possible) deprecation warning might not counterweigh the gain of 
raising the logical exception type. As a compromise, I proposed to raise a 
hybrid that inherits from both.

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[issue37444] Differing exception between builtins and importlib when importing beyond top-level package

[Brett Cannon]

Brett Cannon  added the comment:

There's no deprecation warning because how do you warn about that? You raise 
DeprecationWarning about an exception you have yet to raise?

And I personally think calling this unfair is a bit harsh.

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[issue39408] Add support for SQLCipher

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

If SQLCipher is a drop-in replacement, perhaps the simplest way is to use 
LD_LIBRARY_PATH to replace libsqlite3.

You can also insert a path to your build of the _sqlite module in sys.path 
before standard paths.

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[issue39390] shutil.copytree - 3.8 changed argument types of the ignore callback

[Giampaolo Rodola']

Giampaolo Rodola'  added the comment:

> Should not copytree convert arguments of the ignore callback to str and list 
> correspondingly?

It should. I think it makes sense to just do this for Python 3.8.2 instead of 
updating the doc.

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[issue39408] Add support for SQLCipher

[Sebastian Noack]

Sebastian Noack  added the comment:

Well, the stdlib already depends on a third-party library here, i.e. SQLite3. 
SQLCipher is a drop-in replacement for SQLite3 that adds support for encrypted 
databases. In order to use SQLCipher, I'd have to build the sqlite3 module 
against SQLCipher (instead of SQLite3). As it's a drop-in replacement, no 
further changes are required (unless rather than having SQLCipher bindings 
exposed as a separate module, we want enable it through an argument in 
sqlite3.connect).

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[issue39390] shutil.copytree - 3.8 changed argument types of the ignore callback

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue39353] Deprecate the binhex module, binhex4 and hexbin4 standards

[Ronald Oussoren]

Ronald Oussoren  added the comment:

I agree with deprecating binhex.

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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[Mark Dickinson]

Change by Mark Dickinson :


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[issue37909] Thread pool return ref hold memory

[Andrew Svetlov]

Andrew Svetlov  added the comment:

The latest example releases allocated python objects.
The memory is returned to allocator which, in turn, can hold it for a while. 
The allocator is not controlled by Python API.

Anyway, if an explicit executor solves your needs -- please just use it.

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[issue39390] shutil.copytree - 3.8 changed argument types of the ignore callback

[Manuel Barkhau]

Manuel Barkhau  added the comment:

Is there anything I can do to help move this forward?

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[issue39409] AIX: FAIL: test_specific_values (test.test_cmath.CMathTests)

[Mark Dickinson]

Mark Dickinson  added the comment:

Similar previous issues on macOS: #18513, #15477.

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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

A patch was proposed in issue18842.

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[issue39406] Implement os.putenv() with setenv() if available

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Why posix_putenv_garbage was renamed to putenv_dict?

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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

Change by STINNER Victor :


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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

STINNER Victor  added the comment:

PR 18107 still fix this issue (add os.unsetenv() to Python 3.9 on Windows), but 
fix the implementation (use _wputenv() rather than SetEnvironmentVariableW(), 
to update the CRT).

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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

Change by STINNER Victor :


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[issue39406] Implement os.putenv() with setenv() if available

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

There is also _wputenv_s which affects _spawn, _exec and system.

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[issue39406] Implement os.putenv() with setenv() if available

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 623ed6171eae35af7fd2e804dfd9c832c05c5d48 by Victor Stinner in 
branch 'master':
bpo-39406: Add PY_PUTENV_DICT macro to posixmodule.c (GH-18106)
https://github.com/python/cpython/commit/623ed6171eae35af7fd2e804dfd9c832c05c5d48


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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

STINNER Victor  added the comment:

I checked the doc: _putenv("VAR=") removes the environment variable "VAR". It's 
well documented:

https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/putenv-wputenv?view=vs-2019

"You can remove a variable from the environment by specifying an empty 
value_string, or in other words, by specifying only varname=."

So Python 3.8 os._unsetenv() is correct, but this function was not exposed, and 
so this issue remains relevant: Python 3.8 documents that os.unsetenv() is 
available on Windows, but it's not.

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[issue39406] Implement os.putenv() with setenv() if available

[STINNER Victor]

STINNER Victor  added the comment:

I created bpo-39413 "Implement os.unsetenv() on Windows" to prepare work on 
this issue. But Eryk raised the same concern about CRT: 
https://bugs.python.org/issue39413#msg360404

I wasn't aware of that :-/

> `_wputenv` keeps Python's copy of the environment block in sync with CRT's 
> copy, which in turn calls `SetEnvironmentVariableW` to sync with process 
> environment block. The CRT's copy of the environment excludes and disallows 
> variable names that start with "=". Because the interpreter initializes 
> `os.environ` from the CRT environment, Python has never included or allowed 
> 'hidden' variables such as "=C:". 

My main motivation to use SetEnvironmentVariableW() on Windows is to avoid 
bpo-39395. Do you mean that Windows _putenv() is not affected by bpo-39395: 
Python can safely removes the string to _putenv() just after the call?

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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

STINNER Victor  added the comment:

> This bypasses the CRT's copy of the environment. If any C code calls 
> [_w]getenv, it will still see the variable defined. The only way it won't is 
> if setting the value also bypassed the CRT environment by directly calling 
> SetEnvironmentVariableW.

Oh. That's a valid concern. I reopen the issue.

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[issue39406] Implement os.putenv() with setenv() if available

[STINNER Victor]

Change by STINNER Victor :


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[issue38076] Make struct module PEP-384 compatible

[Eddie Elizondo]

Eddie Elizondo  added the comment:

> I'm concerned by release blocker because 3.9.0a3 version is supposed to be 
> released soon, and usually release blocker do block a release :-)

Ah! That makes sense!

In any case, feel free to ping me if you need help on my side to get this PR 
through (or to remove the release blocker).

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[issue38076] Make struct module PEP-384 compatible

[STINNER Victor]

STINNER Victor  added the comment:

> That should close this issue, no need to work around the bug priority.

I'm concerned by release blocker because 3.9.0a3 version is supposed to be 
released soon, and usually release blocker do block a release :-)

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[issue38076] Make struct module PEP-384 compatible

[Eddie Elizondo]

Eddie Elizondo  added the comment:

The PR that I sent out already fixes the issue. @vstinner, @pablogsal, please 
take a look again https://github.com/python/cpython/pull/18039

That should close this issue, no need to work around the bug priority.

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[issue38076] Make struct module PEP-384 compatible

[STINNER Victor]

STINNER Victor  added the comment:

> The error can still happened in other modules and under similar conditions, 
> no?

The question was if the next 3.9 *alpha* release must be blocked by this issue. 
I don't think so. I reduce the priority to normal (not set). If someone 
disagrees, feel free to raise it again to release blocker ;-)

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[issue38076] Make struct module PEP-384 compatible

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

> Is it enough to reduce the issue priority from release blocker to normal?

The error can still happened in other modules and under similar conditions, no?

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[issue38076] Make struct module PEP-384 compatible

[STINNER Victor]

STINNER Victor  added the comment:

> https://github.com/python/cpython/pull/18038 is a partial fix for this

Is it enough to reduce the issue priority from release blocker to normal?

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[issue38856] asyncio ProactorEventLoop: wait_closed() can raise ConnectionResetError

[STINNER Victor]

Change by STINNER Victor :


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

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[issue38856] asyncio ProactorEventLoop: wait_closed() can raise ConnectionResetError

[STINNER Victor]

Change by STINNER Victor :


--
title: wait_closed() can raise ConnectionResetError -> asyncio 
ProactorEventLoop: wait_closed() can raise ConnectionResetError

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[issue39414] Multiprocessing resolving object as None

[Reece Dunham]

Reece Dunham  added the comment:

Not sure exactly where its being thrown, but I know it happened in 
https://cirrus-ci.com/task/4875001270632448?command=test_pyside2#L3974

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[issue38856] wait_closed() can raise ConnectionResetError

[STINNER Victor]

STINNER Victor  added the comment:

Why is this issue marked as a release blocker? Is it a Python 3.8 regression, 
or just a regular bug?

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[issue39145] Innocuous parent class changes multiple inheritance MRO

[Dong-hee Na]

Change by Dong-hee Na :


--
pull_requests:  -17493

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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[Dong-hee Na]

Change by Dong-hee Na :


--
keywords: +patch
pull_requests: +17494
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18105

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[issue39145] Innocuous parent class changes multiple inheritance MRO

[Dong-hee Na]

Change by Dong-hee Na :


--
pull_requests: +17493
pull_request: https://github.com/python/cpython/pull/18105

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[issue39414] Multiprocessing resolving object as None

[Dong-hee Na]

Dong-hee Na  added the comment:

If you don't mind, Would you like to attach the reproducible script for this?

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[issue39415] Remove unused code from longobject.c complexobject.c floatobject.c

[Dong-hee Na]

New submission from Dong-hee Na :

For example, long_is_finite has not been used for 12 years.

--
assignee: corona10
messages: 360408
nosy: corona10
priority: normal
severity: normal
status: open
title: Remove unused code from longobject.c complexobject.c floatobject.c

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[issue39414] Multiprocessing resolving object as None

[Reece Dunham]

Change by Reece Dunham :


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type:  -> behavior

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[issue39414] Multiprocessing resolving object as None

[Reece Dunham]

New submission from Reece Dunham :

Exception ignored in: 
Traceback (most recent call last):
  File "/root/conda/lib/python3.8/multiprocessing/pool.py", line 268, in __del__
  File "/root/conda/lib/python3.8/multiprocessing/queues.py", line 362, in put
AttributeError: 'NoneType' object has no attribute 'dumps'

Pretty sure that shouldn't be None.

--
components: Library (Lib)
messages: 360407
nosy: rdil
priority: normal
severity: normal
status: open
title: Multiprocessing resolving object as None
versions: Python 3.8

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[issue39410] CentOS 6.10 SQLite 3.30.1 - _sqlite3 builds successfully but is removed because it cannot be imported.

[SilentGhost]

Change by SilentGhost :


--
components: +Library (Lib)
nosy: +ghaering
versions: +Python 3.9

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[issue39407] Bitfield Union does not work for bit widths greater than 8 bits

[SilentGhost]

Change by SilentGhost :


--
nosy: +amaury.forgeotdarc, belopolsky, meador.inge
versions:  -Python 3.5, Python 3.6

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[issue37909] Thread pool return ref hold memory

[Anders]

Anders  added the comment:

Note: due to a change in Python 3.8 this example would be a lot less noticeable 
if tested. The problem remains the same though.

If you run this snippet with Python 3.7, which is before the thread reuse was 
introduced into the ThreadPoolExecutor, each thread will keep around 600mb of 
memory in use.

This can be solved by shutting down the ThreadPoolExecutor which this example 
does.

Now, the big problem is that asyncio uses a long-running ThreadPoolExecutor, 
per default, for run_in_executor. Those threads will stay around forever and 
consume memory until the application is shut down.

If you have a job that consumes a lot of memory for a short period of time and 
use any long-running ThreadPoolExecutor then the memory will just keep growing 
as the job hits various threads that are never cleaned up.

--
import asyncio
import concurrent
import threading


def prepare_a_giant_list():
d = {}
for i in range(1000):
d[i] = {}
for j in range(1000):
d[i][j] = {}
for k in range(30):
d[i][j][k] = 'a' * 1000
del d

th_num = threading.active_count()
print("Thread number is {}".format(th_num))


async def main():
loop = asyncio.get_running_loop()
with concurrent.futures.ThreadPoolExecutor(max_workers=20) as 
async_executor:
await loop.run_in_executor(async_executor, prepare_a_giant_list)
await asyncio.sleep(5)
await loop.run_in_executor(async_executor, prepare_a_giant_list)
await asyncio.sleep(5)
await loop.run_in_executor(async_executor, prepare_a_giant_list)
await asyncio.sleep(5)
await loop.run_in_executor(async_executor, prepare_a_giant_list)
await asyncio.sleep(5)
print('Done!')
await asyncio.sleep(15)


if __name__ == "__main__":
asyncio.run(main())
--

--
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versions: +Python 3.6, Python 3.7

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[issue39412] Install launcher for all users

[Eryk Sun]

Eryk Sun  added the comment:

The py launcher is separate from individual installations of Python. However 
many versions of Python are installed at the system level and for however many 
users, the system needs only one installation of the launcher. That's why it's 
recommended to install for all users. 

If the current user can't elevate to administrator access, it's possible to 
choose to install the py launcher for just the current user. In this case it 
installs to the user's "%LocalAppData%\Programs\Python\Launcher" directory, and 
this directory is added to PATH.

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[issue39412] Install launcher for all users

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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

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[issue39413] Implement os.unsetenv() on Windows

[Eryk Sun]

Eryk Sun  added the comment:

This bypasses the CRT's copy of the environment. If any C code calls 
[_w]getenv, it will still see the variable defined. The only way it won't is if 
setting the value also bypassed the CRT environment by directly calling 
SetEnvironmentVariableW.

--
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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

Change by STINNER Victor :


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

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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 56cd3710a1ea3ba872d345ea1bebc86ed08bc8b8 by Victor Stinner in 
branch 'master':
bpo-39413: Implement os.unsetenv() on Windows (GH-18104)
https://github.com/python/cpython/commit/56cd3710a1ea3ba872d345ea1bebc86ed08bc8b8


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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

Change by STINNER Victor :


--
keywords: +patch
pull_requests: +17492
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18104

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[issue39411] pyclbr rewrite on AST

[Batuhan Taskaya]

Change by Batuhan Taskaya :


--
type:  -> enhancement

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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

New submission from STINNER Victor :

os.unsetenv() is documented to be available on Windows, but it's not.

In Python 3.8, "del os.environ[key]" is implemented as:

   os.putenv(key.upper(), "")

Attached PR implements it using SetEnvironmentVariableW(name, NULL).

--
components: Library (Lib), Windows
messages: 360402
nosy: paul.moore, steve.dower, tim.golden, vstinner, zach.ware
priority: normal
severity: normal
status: open
title: Implement os.unsetenv() on Windows
versions: Python 3.9

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[issue39412] Install launcher for all users

[ccetsii]

New submission from ccetsii :

In Python 3.8.1 (32 bits) Windows Installer, the first page show a checkbox for 
"install launcher for all users (recommended)", but software install in user 
directory (see screenchot attachment).
Casually, in "customize installation" option, exist other "Install for all 
users" options, and that option works correctly.

--
files: python_installer.png
messages: 360401
nosy: ccetsii
priority: normal
severity: normal
status: open
title: Install launcher for all users
type: behavior
versions: Python 3.8
Added file: https://bugs.python.org/file48857/python_installer.png

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[issue39410] CentOS 6.10 SQLite 3.30.1 - _sqlite3 builds successfully but is removed because it cannot be imported.

[Igor Ceh]

Igor Ceh  added the comment:

I've changed ./Modules/_sqlite/util.h

//#if SQLITE_VERSION_NUMBER >= 3007014
#if SQLITE_VERSION_NUMBER >= 3107014 // Change
#define SQLITE3_CLOSE sqlite3_close_v2
#else
#define SQLITE3_CLOSE sqlite3_close
#endif

#endif

And tried to recompile with a new error:
*** WARNING: renaming "_sqlite3" since importing it failed: 
build/lib.linux-x86_64-3.8/_sqlite3.cpython-38-x86_64-linux-gnu.so: undefined 
symbol: sqlite3_errstr  



The following modules found by detect_modules() in setup.py, 
have been   

built by the Makefile instead, as configured by the Setup 
files:  

   _abc  atexitpwd
time


Failed to build these modules:
_uuid


Following modules built successfully but were removed because they could not be 
imported:
_sqlite3

Went into ./Modules/_sqlite/connection.c and also changed:
//#if SQLITE_VERSION_NUMBER > 3007015
#if SQLITE_VERSION_NUMBER > 3107015 // Change   


   PyErr_SetString(pysqlite_OperationalError, 
sqlite3_errstr(rc));

With these changes the build was successful and I can import sqlite3. But I 
have no idea if this has any unforeseen consequences.

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[issue35943] PyImport_GetModule() can return partially-initialized module

[Joannah Nanjekye]

Joannah Nanjekye  added the comment:

> Do you mean that there is a risk that the backport introduces a regression in 
> another part of the code? If yes, I would suggest to not backport the change 
> to *stable* branches.

My worry are the many changes that are required to ceval to make this back port 
work. Not that I think we can not successfully backport things. we can.

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[issue39402] Consistent use of terms

[Raymond Leiter]

Raymond Leiter  added the comment:

Ray;
Thanks for the reply.
I understand very well, your remarks -- and, in fact, agree with them.
I think my aversion to chaotic terminology stems from my study of BNF and
the joy of reading RFCs.
I'll send in suggestions if I find actual errors or really confusing
explanations of concepts.
Thanks again.
Ray

On Tue, Jan 21, 2020 at 2:19 AM Raymond Hettinger 
wrote:

>
> Raymond Hettinger  added the comment:
>
> I don't think we would ever consider replacing "parentheses" with "round
> brackets".  Also, we have long talked about "curly braces" though the
> braces/brackets choice is a little loose.  Also note that greater-than or
> less-than have established usage (see the html entities or unicode code
> point name for example).
>
> > I'm well aware of the difficulty in garnering support for
> > this kind of an 'improvement', but I felt it needed said.
>
> I appreciate that.  Thanks for the suggestion, but we'll decline a
> wholesale search and replace mission.  If an individual case of known
> confusion arises, we can take a look at it, but for now we have no evidence
> that the current docs are causing confusion for end users.
>
> --
> nosy: +rhettinger
> resolution:  -> rejected
> stage:  -> resolved
> status: open -> closed
>
> ___
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> 
> ___
>

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[issue39409] AIX: FAIL: test_specific_values (test.test_cmath.CMathTests)

[Mark Dickinson]

Change by Mark Dickinson :


--
nosy: +mark.dickinson

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[issue39411] pyclbr rewrite on AST

[Batuhan]

Change by Batuhan :


--
keywords: +patch
pull_requests: +17491
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18103

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[issue39411] pyclbr rewrite on AST

[Batuhan Taskaya]

New submission from Batuhan Taskaya :

pyclbr currently uses token streams to analyze but it can be alot simpler with 
usage of AST. There are already many flaws, including some comments about 
limitations of this token stream processing. 

I have a draft about this. Initial PR wont change any behavior, it will just 
make code much simpler with the usage of AST (just an addition to Function 
about handling of async functions, is_async field). If agreed I can propose a 
second PR (or append the inital one) that will enhance Function/Class objects 
with various identifiers (like keywords, metaclasses, end position information 
etc.). The second PR will be alot easier to do thanks to AST.

--
components: Library (Lib)
messages: 360397
nosy: Batuhan Taskaya, pablogsal
priority: normal
severity: normal
status: open
title: pyclbr rewrite on AST
versions: Python 3.9

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[issue39408] Add support for SQLCipher

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

What exactly do you need to add and change in the sqlite module? The stdlib 
cannot depend on a third-party module. Ideally, you just create a subclass of 
some standard class and overrides a constructor and few methods.

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[issue39410] CentOS 6.10 SQLite 3.30.1 - _sqlite3 builds successfully but is removed because it cannot be imported.

[Igor Ceh]

New submission from Igor Ceh :

While trying to build Python 3.8.1 from source with Sqlite 3.30.1 on a CentOS 
6.10 I get the following warning:

*** WARNING: renaming "_sqlite3" since importing it failed: 
build/lib.linux-x86_64-3.8/_sqlite3.cpython-38-x86_64-linux-gnu.so: undefined 
symbol: sqlite3_close_v2

The following modules found by detect_modules() in setup.py, have been
built by the Makefile instead, as configured by the Setup files:
_abc  atexitpwd
time


Failed to build these modules:
_uuid


Following modules built successfully but were removed because they could not be 
imported:
_sqlite3

If I try to import sqlite in python:
[vagrant@centos6 Python-3.8.1]$ ./python
Python 3.8.1 (default, Jan 21 2020, 04:22:59)
[GCC 4.4.7 20120313 (Red Hat 4.4.7-23)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import sqlite3
Traceback (most recent call last):
  File "", line 1, in 
  File "/usr/local/src/Python-3.8.1/Lib/sqlite3/__init__.py", line 23, in 

from sqlite3.dbapi2 import *
  File "/usr/local/src/Python-3.8.1/Lib/sqlite3/dbapi2.py", line 27, in 
from _sqlite3 import *
ModuleNotFoundError: No module named '_sqlite3'
>>>

Also tried building with SQLite version 3.7.9 from atomic repository with same 
error.

--
messages: 360395
nosy: cehovski
priority: normal
severity: normal
status: open
title: CentOS 6.10 SQLite 3.30.1 - _sqlite3 builds successfully but is removed 
because it cannot be imported.
type: compile error
versions: Python 3.8

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[issue37444] Differing exception between builtins and importlib when importing beyond top-level package

[Miro Hrončok]

Miro Hrončok  added the comment:

While raising ImportError certainly makes much more sense in this case, this 
change is backwards incompatible and there was no DeprecationWarning. I don't 
consider that fair.

As a certain compromise, we could maybe raise a custom ImportError+ValueError 
offspring (e.g. BeyondToplevelImportError)?

If feeling fancy, we could rise a DeprecationWarning when 
issublcass(BeyondToplevelImportError, ValueError) is used?

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[issue33387] Simplify bytecodes for try-finally, try-except and with blocks.

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 629023c05be24fa2f01c914c739aaa5a61a0304c by Victor Stinner in 
branch 'master':
bpo-33387: Fix compiler warning in frame_block_unwind() (GH-18099)
https://github.com/python/cpython/commit/629023c05be24fa2f01c914c739aaa5a61a0304c


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[issue39389] gzip metadata fails to reflect compresslevel

[miss-islington]

miss-islington  added the comment:


New changeset ab0d8e356ecd351d55f89519a6a97a1e69c0dfab by Miss Islington (bot) 
in branch '3.8':
bpo-39389: gzip: fix compression level metadata (GH-18077)
https://github.com/python/cpython/commit/ab0d8e356ecd351d55f89519a6a97a1e69c0dfab


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[issue39408] Add support for SQLCipher

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
nosy: +berker.peksag, ghaering

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[issue39389] gzip metadata fails to reflect compresslevel

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Thank you for your contribution William!

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

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[issue39389] gzip metadata fails to reflect compresslevel

[miss-islington]

Change by miss-islington :


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pull_requests: +17489
pull_request: https://github.com/python/cpython/pull/18100

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[issue39389] gzip metadata fails to reflect compresslevel

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset eab3b3f1c60afecfb4db3c3619109684cb04bd60 by Serhiy Storchaka 
(William Chargin) in branch 'master':
bpo-39389: gzip: fix compression level metadata (GH-18077)
https://github.com/python/cpython/commit/eab3b3f1c60afecfb4db3c3619109684cb04bd60


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[issue39389] gzip metadata fails to reflect compresslevel

[miss-islington]

Change by miss-islington :


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pull_request: https://github.com/python/cpython/pull/18101

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[issue39409] AIX: FAIL: test_specific_values (test.test_cmath.CMathTests)

[Michael Felt]

New submission from Michael Felt :

Per message: https://bugs.python.org/issue39396#msg360362

opening new issue. Research (as requested) to follow.

--
components: Tests
messages: 360389
nosy: Michael.Felt, vstinner
priority: normal
severity: normal
status: open
title: AIX: FAIL: test_specific_values (test.test_cmath.CMathTests)
versions: Python 3.9

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[issue39406] Implement os.putenv() with setenv() if available

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

This indeed a good argument to continue to use _wputenv. Thank you Eryk, you 
have saved us from making a mistake.

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[issue39397] Mac : fail to launch Python 3.8

[Ronald Oussoren]

Ronald Oussoren  added the comment:

The other locale related settings are off as well, the default system locale 
ends with ".UTF-8".

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[issue39406] Implement os.putenv() with setenv() if available

[Eryk Sun]

Eryk Sun  added the comment:

> Maybe use SetEnvironmentVariable() on Windows? 

`_wputenv` keeps Python's copy of the environment block in sync with CRT's 
copy, which in turn calls `SetEnvironmentVariableW` to sync with process 
environment block. The CRT's copy of the environment excludes and disallows 
variable names that start with "=". Because the interpreter initializes 
`os.environ` from the CRT environment, Python has never included or allowed 
'hidden' variables such as "=C:". 

Switching to calling `SetEnvironmentVariableW` directly won't affect 
`os.system` and `os.spawnv[e]`, since the CRT calls `CreateProcessW` without 
overriding the process environment. However, have you considered the 
consequences for extension modules and embedding applications that use the CRT 
environment (e.g. `getenv`, `_wgetenv`) if the interpreter stops syncing with 
it? 

The concern that `[_w]putenv` doesn't copy the string does not apply to Windows.

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nosy: +eryksun

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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[miss-islington]

miss-islington  added the comment:


New changeset 060ad2fc1535adc76f96be8269b4af0f14429161 by Miss Islington (bot) 
in branch '3.8':
bpo-32989: IDLE - fix bad editor call of pyparse method (GH-5968)
https://github.com/python/cpython/commit/060ad2fc1535adc76f96be8269b4af0f14429161


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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[miss-islington]

miss-islington  added the comment:


New changeset f3d3a3cc114ed30829544c3613b73e4fa6dd5599 by Miss Islington (bot) 
in branch '3.7':
bpo-32989: IDLE - fix bad editor call of pyparse method (GH-5968)
https://github.com/python/cpython/commit/f3d3a3cc114ed30829544c3613b73e4fa6dd5599


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[issue33387] Simplify bytecodes for try-finally, try-except and with blocks.

[STINNER Victor]

Change by STINNER Victor :


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pull_request: https://github.com/python/cpython/pull/18099

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[issue39396] AIX: self.assertEqualSign(math.nextafter(-0.0, +0.0), +0.0) test fails on AIX

[STINNER Victor]

STINNER Victor  added the comment:

My change should fix nextafter test failure on AIX.

Again, please open a separated issue for "FAIL: test_specific_values 
(test.test_cmath.CMathTests)".

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

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[issue39396] AIX: self.assertEqualSign(math.nextafter(-0.0, +0.0), +0.0) test fails on AIX

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 85ead4fc62829cb7ef2eb0af1a2933282f58c629 by Victor Stinner in 
branch 'master':
bpo-39396: Fix math.nextafter(-0.0, +0.0) on AIX 7.1 (GH-18094)
https://github.com/python/cpython/commit/85ead4fc62829cb7ef2eb0af1a2933282f58c629


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[issue39283] Add ability to inherit unittest arguement parser

[Ajay Tripathi]

Ajay Tripathi  added the comment:

Hi pual,

> The issue of testing a script that uses argparse has come up on StackOverFlow 
> a number of times.

Sorry for the confusing but this is not a support ticket,
I am not stuck with a problem and I am aware of the variaous solutions on 
Stackoverflow to use arguements with unittest module.

Instead, I am proposing a change in the module so that the user of unittest can 
get the `parent_parser` and add their arguements in the unitest argparser 
instance itself.


I propose this change because it seems like a more intuitive way to use 
argparser with unittest to me and I hope to hear your thoughts on the change 
and if it is desired.



Best,
Ajay Tripathi

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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[miss-islington]

Change by miss-islington :


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pull_requests: +17487
pull_request: https://github.com/python/cpython/pull/18097

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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[Terry J. Reedy]

Terry J. Reedy  added the comment:


New changeset ec64640a2c5236d7a5d5470d759172a3d93eab0b by Terry Jan Reedy 
(Cheryl Sabella) in branch 'master':
bpo-32989: IDLE - fix bad editor call of pyparse method (GH-5968)
https://github.com/python/cpython/commit/ec64640a2c5236d7a5d5470d759172a3d93eab0b


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