[issue39279] Don't allow non-Ascii digits in platform.py

[Mark Dickinson]

Mark Dickinson  added the comment:

> If you think I need to come up with a specific example where this can be 
> misused

I think so, yes. :-)

We shouldn't change this (and risk other breakage) without evidence that 
there's an actual problem.

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

[Ammar Askar]

Change by Ammar Askar :


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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[Terry J. Reedy]

Change by Terry J. Reedy :


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[issue39295] usage of bitfields in ctypes structures changed between 3.7.5 and 3.7.6

[Vinay Sajip]

Change by Vinay Sajip :


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[issue38921] Max Recursion Depth Reached in Logging Library

[Vinay Sajip]

Vinay Sajip  added the comment:

@yang, thanks for the analysis - spot on. Closing, as this is a bug in the 
reporter's code and not in logging.

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[issue35003] Provide an option to venv to put files in a bin/ directory on Windows

[Vinay Sajip]

Vinay Sajip  added the comment:

> This *should* reside in the bin directory

That's your opinion, but there are other views. As Paul Moore said in this 
comment:

https://github.com/python/cpython/pull/18083#issuecomment-577278587

Having things in bin *and* Scripts is more confusing than "on Windows use 
Scripts, on POSIX use bin".

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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[miss-islington]

miss-islington  added the comment:


New changeset 545fc51d950558ecec9ff64cb2f9c11469051524 by Miss Islington (bot) 
in branch '3.8':
bpo-32989: IDLE - remove unneeded parameter  (GH-18138)
https://github.com/python/cpython/commit/545fc51d950558ecec9ff64cb2f9c11469051524


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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[miss-islington]

miss-islington  added the comment:


New changeset 36968c13cb9800559dbb90686933da7daf52c788 by Miss Islington (bot) 
in branch '3.7':
bpo-32989: IDLE - remove unneeded parameter  (GH-18138)
https://github.com/python/cpython/commit/36968c13cb9800559dbb90686933da7daf52c788


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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[Terry J. Reedy]

Terry J. Reedy  added the comment:


New changeset f9e07e116c32b6dc4561d0bdeb452ccde13b0e7c by Terry Jan Reedy in 
branch 'master':
bpo-32989: IDLE - remove unneeded parameter  (GH-18138)
https://github.com/python/cpython/commit/f9e07e116c32b6dc4561d0bdeb452ccde13b0e7c


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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[miss-islington]

Change by miss-islington :


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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[miss-islington]

Change by miss-islington :


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[issue39279] Don't allow non-Ascii digits in platform.py

[Ezio Melotti]

Ezio Melotti  added the comment:

Do you know/can you verify if Chinese versions of Windows/Linux/MacOS  include 
non-ASCII version numbers (e.g. fullwidth digits)?

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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[Terry J. Reedy]

Change by Terry J. Reedy :


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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Tim, idlelib.pyparse has this definition:

# Find what looks like the start of a popular statement.
_synchre = re.compile(r"""
^
[ \t]*
(?: while
|   else
|   def
|   return
|   assert
|   break
|   class
|   continue
|   elif
|   try
|   except
|   raise
|   import
|   yield
)
\b
""", re.VERBOSE | re.MULTILINE).search

You are credited with adding 'yield' to David Sherer's original list:
  "Taught IDLE's autoident parser that "yield" is a keyword that begins
   a stmt." --tim_one (found via git blame)

Do you know if there is any reason to not add 'if', 'for', and now 'with'?

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[issue32989] IDLE: Fix pyparse.find_good_parse_start

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Cheryl, sorry to take so long.  I will look at and probably remove the _synchre 
parameter, on this issue.  Feel free to pursue any of the other possible 
followups.

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[issue39050] The "Help" button in IDLE's config dialog does not work

[miss-islington]

miss-islington  added the comment:


New changeset 3b7618809df647574e8aad4c2d869a1d55df147c by Miss Islington (bot) 
in branch '3.8':
bpo-39050: The Help button in IDLE's config menu works again (GH-17611)
https://github.com/python/cpython/commit/3b7618809df647574e8aad4c2d869a1d55df147c


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[issue39050] The "Help" button in IDLE's config dialog does not work

[miss-islington]

miss-islington  added the comment:


New changeset ba83d1eb1c7b5e8eab17da364a6324b0b0e0932b by Miss Islington (bot) 
in branch '3.7':
bpo-39050: The Help button in IDLE's config menu works again (GH-17611)
https://github.com/python/cpython/commit/ba83d1eb1c7b5e8eab17da364a6324b0b0e0932b


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[issue39050] The "Help" button in IDLE's config dialog does not work

[miss-islington]

Change by miss-islington :


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[issue39050] The "Help" button in IDLE's config dialog does not work

[Terry J. Reedy]

Terry J. Reedy  added the comment:


New changeset 2e43b64c94e49f7133b9c26e84c9519935c49063 by Terry Jan Reedy 
(Zackery Spytz) in branch 'master':
bpo-39050: The Help button in IDLE's config menu works again (GH-17611)
https://github.com/python/cpython/commit/2e43b64c94e49f7133b9c26e84c9519935c49063


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[issue39050] The "Help" button in IDLE's config dialog does not work

[miss-islington]

Change by miss-islington :


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[issue39298] add BLAKE3 to hashlib

[Jack O'Connor]

Jack O'Connor  added the comment:

Version 0.1.3 of the official BLAKE3 repo includes some significant performance 
improvements:

- The x86 implementations include explicit prefetch instructions, which helps 
with long inputs. (commit b8c33e1)
- The C implementation now uses the same parallel parent hashing strategy that 
the Rust implementation uses. (commit 163f522)

When I repeat the benchmarks above with TurboBoost on, here's what I see now:

BLAKE3 Rust  2578 MB/s
BLAKE3 C (clang -O3) 2502 MB/s
BLAKE3 C (gcc -O2)   2223 MB/s
K12 C (gcc -O2)  2175 MB/s

Larry, if you have time to repeat your benchmarks with the latest C code, I'd 
be curious to see if you get similar results.

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[issue39401] Unsafe dll loading in getpathp.c on Win7

[Ned Deily]

Change by Ned Deily :


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[issue39401] Unsafe dll loading in getpathp.c on Win7

[Ned Deily]

Change by Ned Deily :


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[issue39279] Don't allow non-Ascii digits in platform.py

[Xiang Zhang]

Xiang Zhang  added the comment:

I can't understand the rational for rejecting localized digits though I don't 
know who will use them in practise. I'd rather fix it until there is a real 
problem with it.

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

[STINNER Victor]

Change by STINNER Victor :


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[issue29435] Allow to pass fileobj to is_tarfile

[William Woodruff]

William Woodruff  added the comment:

Thanks to you to!

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[issue29435] Allow to pass fileobj to is_tarfile

[Ethan Furman]

Ethan Furman  added the comment:

Thanks, William!

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status: open -> closed

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[issue29435] Allow to pass fileobj to is_tarfile

[Ethan Furman]

Ethan Furman  added the comment:


New changeset dd754caf144009f0569dda5053465ba2accb7b4d by Ethan Furman (William 
Woodruff) in branch 'master':
bpo-29435: Allow is_tarfile to take a filelike obj (GH-18090)
https://github.com/python/cpython/commit/dd754caf144009f0569dda5053465ba2accb7b4d


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[issue39395] The os module should unset() environment variable at exit

[STINNER Victor]

STINNER Victor  added the comment:

Clearing environment variables at exit has a drawback: it changes the behavior 
in code executed after Python finalization (Py_FinalizeEx() call). It may cause 
regression.

So I proposed PR 18135 to fix this issue differently: on non-Windows platforms, 
Python now requires setenv() to build. This PR has no backward compatibility 
issue: it doesn't unset environment variables at exit.

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[issue39395] The os module should unset() environment variable at exit

[STINNER Victor]

Change by STINNER Victor :


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[issue39401] Unsafe dll loading in getpathp.c on Win7

[Steve Dower]

Steve Dower  added the comment:

Agreed, we can just search System32 for this. Thanks for doing the patch!

For future reference, and for anyone else reading this, we generally prefer 
unavoidable DLL hijacking bugs to come to the Python Security Response Team 
first (secur...@python.org).

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[issue39412] Install launcher for all users

[Steve Dower]

Steve Dower  added the comment:

It's also a little bit historical - there was no way to *remove* the Python 3.4 
launcher (always in C:\Windows), and it wasn't going to find many 3.5 installs, 
so we stomp on it.

At this stage, it's potentially safe to turn it into a per-user install by 
default, but I'm not convinced it's a big enough issue to make the change. The 
only "complaints" I've ever heard have been like this one.

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[issue39412] Install launcher for all users

[Steve Dower]

Change by Steve Dower :


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stage:  -> resolved
status: open -> closed

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[issue39427] python -X options are not documented in the CLI --help

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue39427] python -X options are not documented in the CLI --help

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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pull_request: https://github.com/python/cpython/pull/18133

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[issue39429] Add a new "Python Development Mode" page to the documentation

[STINNER Victor]

Change by STINNER Victor :


--
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stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18132

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[issue39427] python -X options are not documented in the CLI --help

[miss-islington]

miss-islington  added the comment:


New changeset 41f0ef6abbd304409c55612a08788cdd59fbc8a3 by Miss Islington (bot) 
(Pablo Galindo) in branch 'master':
bpo-39427: Document -X opt options in the CLI --help and the man page (GH-18131)
https://github.com/python/cpython/commit/41f0ef6abbd304409c55612a08788cdd59fbc8a3


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[issue39429] Add a new "Python Development Mode" page to the documentation

[STINNER Victor]

New submission from STINNER Victor :

Currently, the Python Development Mode is under-documented. The documentation 
lives in the documentation of the -X command line option which doesn't give 
much space to elaborate on effects of the development mode, how it should be 
used, suggest ways to get more information, etc.

Attached PR adds a new "Python Development Mode" page to the documentation to 
suggest more advices and add examples.

--
assignee: docs@python
components: Documentation
messages: 360527
nosy: docs@python, vstinner
priority: normal
severity: normal
status: open
title: Add a new "Python Development Mode" page to the documentation
versions: Python 3.9

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[issue39336] Immutable module type can't be used as package in custom loader

[Dino Viehland]

Change by Dino Viehland :


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[issue39336] Immutable module type can't be used as package in custom loader

[Dino Viehland]

Dino Viehland  added the comment:


New changeset 9b6fec46513006d7b06fcb645cca6e4f5bf7c7b8 by Dino Viehland in 
branch 'master':
bpo-39336: Allow packages to not let their child modules be set on them (#18006)
https://github.com/python/cpython/commit/9b6fec46513006d7b06fcb645cca6e4f5bf7c7b8


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[issue39389] gzip metadata fails to reflect compresslevel

[William Chargin]

William Chargin  added the comment:

My pleasure; thanks for the triage and review!

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

[Miro Hrončok]

Miro Hrončok  added the comment:

For the record, looking at https://docs.python.org/3.9/whatsnew/3.9.html I had 
an impression that this also affects regular imports, as described in 
https://bugzilla.redhat.com/show_bug.cgi?id=1791769#c2 -- if that's not that 
case, I'm sorry.

Anyway, I get your point of "next 30 years of Python".

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[issue39428] allow creation of "symtable entry" objects from Python

[Carl Meyer]

New submission from Carl Meyer :

Currently the "symtable entry" extension type (PySTEntry_Type) defined in 
`Python/symtable.c` defines no `tp_new` or `tp_init`, making it impossible to 
create instances of this type from Python code.

I have a use case for pickling symbol tables (as part of a cache subsystem for 
a static analyzer), but the inability to create instances of symtable entries 
from attributes makes this impossible, even with custom pickle support via 
dispatch_table or copyreg.

If the idea of making instances of this type creatable from Python is accepted 
in principle, I can submit a PR for it.

Thanks!

--
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priority: normal
severity: normal
status: open
title: allow creation of "symtable entry" objects from Python
type: enhancement

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[issue35182] Popen.communicate() breaks when child closes its side of pipe but not exits

[Gregory P. Smith]

Gregory P. Smith  added the comment:

backport automation appears unhappy at the moment.  I'm keeping this open and 
assigned to me to manually run cherry_picker on this for 3.8 and 3.7 (if still 
open for non-security fixes).

--
assignee:  -> gregory.p.smith
stage: patch review -> backport needed
versions:  -Python 2.7, Python 3.4, Python 3.5, Python 3.6

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[issue35182] Popen.communicate() breaks when child closes its side of pipe but not exits

[Gregory P. Smith]

Gregory P. Smith  added the comment:


New changeset d3ae95e1e945ed20297e1c38ba43a18b7a868ab6 by Gregory P. Smith 
(Alex Rebert) in branch 'master':
bpo-35182: fix communicate() crash after child closes its pipes (GH-17020) 
(GH-18117)
https://github.com/python/cpython/commit/d3ae95e1e945ed20297e1c38ba43a18b7a868ab6


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

[Martin Panter]

Martin Panter  added the comment:

Building and verifying the checksum in "RTA protocol" that uses this: 
.
 But I understand CRC-CCITT is one of the two popular 16-bit CRC polynomials, 
used in many other places, according to 
.

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

[STINNER Victor]

STINNER Victor  added the comment:

> Is there a recommended replacement for calculating CRC-CCITT? Do it yourself 
> in Python code, or use a particular external module?

What is your use case?

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

[Martin Panter]

Martin Panter  added the comment:

Is there a recommended replacement for calculating CRC-CCITT? Do it yourself in 
Python code, or use a particular external module?

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[issue39427] python -X options are not documented in the CLI --help

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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pull_request: https://github.com/python/cpython/pull/18131

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[issue39427] python -X options are not documented in the CLI --help

[Pablo Galindo Salgado]

New submission from Pablo Galindo Salgado :

When running python --help there is no documentation on the -X opt options 
available. It just says:

-X opt : set implementation-specific option

without what 'opt' can be.

--
assignee: pablogsal
components: Interpreter Core
messages: 360516
nosy: pablogsal, vstinner
priority: normal
severity: normal
status: open
title: python -X options are not documented in the CLI --help
versions: Python 3.7, Python 3.8, Python 3.9

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[issue39425] list.count performance regression

[STINNER Victor]

Change by STINNER Victor :


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[issue39395] The os module should unset() environment variable at exit

[STINNER Victor]

STINNER Victor  added the comment:

I closed bpo-39406: os.putenv() is now implemented with setenv() if available. 
The internal putenv_dict is no longer used on Windows and if setenv() is 
available.

Now only non-Windows platforms without setenv() are affected by this issue.

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[issue39366] Remove deprecated nntplib method

[Berker Peksag]

Berker Peksag  added the comment:

Thanks for the PR! I'm glad these previously deprecated functions are now gone.

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resolution:  -> fixed
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status: open -> closed
type:  -> enhancement

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

[STINNER Victor]

STINNER Victor  added the comment:

The initial issue has been fixed, so I close the issue. Big thanks to Eryk Sun 
for your great help, thanks also Serhiy Storchaka.

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

[STINNER Victor]

STINNER Victor  added the comment:

Serhiy:
> Maybe use SetEnvironmentVariable() on Windows?

In bpo-39413, I implemented os.unsetenv() on Windows using 
SetEnvironmentVariable(), but Eryk reported that SetEnvironmentVariable() does 
not update the CRT API (_environ, _wenviron, getenv, etc.). So I reverted my 
change. See bpo-39413 for the details.


Eryk:
> Windows ucrt copies the buffer that's passed to _[w]putenv.

Thank you for checking manually. I pushed commit 
0852c7dd52ac42e7843ddfef44571494e4c86070 to avoid putenv_dict on Windows.

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[issue39366] Remove deprecated nntplib method

[Berker Peksag]

Berker Peksag  added the comment:


New changeset 1f0f102dec506fd06f912b74dd2be64a7fba0d3f by Berker Peksag 
(Dong-hee Na) in branch 'master':
bpo-39366: Remove xpath() and xgtitle() methods of NNTP (GH-18035)
https://github.com/python/cpython/commit/1f0f102dec506fd06f912b74dd2be64a7fba0d3f


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[issue39425] list.count performance regression

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

> The following result is a little bit surprising:

haha, I went to exactly the same journey when reviewing this PR :)

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

[STINNER Victor]

STINNER Victor  added the comment:


New changeset b477d19a6b7751b0c933b239dae4fc96dbcde9c4 by Victor Stinner in 
branch 'master':
bpo-39406: Implement os.putenv() with setenv() if available (GH-18128)
https://github.com/python/cpython/commit/b477d19a6b7751b0c933b239dae4fc96dbcde9c4


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[issue39425] list.count performance regression

[STINNER Victor]

STINNER Victor  added the comment:

> In fact, PyObject_RichCompareBool() has a fast path if the two object 
> pointers are equal

It's documented:

https://docs.python.org/dev/c-api/object.html?highlight=pyobject_richcomparebool#c.PyObject_RichCompareBool

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[issue39425] list.count performance regression

[STINNER Victor]

STINNER Victor  added the comment:

The following result is a little bit surprising:

>>> nan=float("nan"); ([nan]*5).count(nan)
5
>>> nan == nan
False

But in fact, the optimization doesn't change the value. It was already 5 
previously.

In fact, PyObject_RichCompareBool() has a fast path if the two object pointers 
are equal:

/* Quick result when objects are the same.
   Guarantees that identity implies equality. */
if (v == w) {
if (op == Py_EQ)
return 1;
else if (op == Py_NE)
return 0;
}

In short, the optimization is good: thank you ;-)

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[issue39411] pyclbr rewrite using AST

[Terry J. Reedy]

Terry J. Reedy  added the comment:

A separate doc change issue and PR would be fine.  Should we add a note 
explaining the module name as a contraction of an originally restricted scope?  
Make me nosy and invite review.

Actually, a doc issue for the module as is should *fully* explain readmodule_ex 
first (its entry is now incomplete), and then explain readmodule as a filtered 
version kept for back compatibility.  This could be a separate PR on the same 
issue, written by one of us, if too much for your friend.

I understood limits of this PR. I should have said change notes were intended 
for your 'second PR'. 

Changing the return value to a Module should mean a third function, which would 
then become the main function, as readmodule_ex would then be Module.children.

I have thought about making it possible to browse non-source modules, at least 
for the module being browsed.  I might implement that first in IDLE.

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

[STINNER Victor]

Change by STINNER Victor :


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

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 0852c7dd52ac42e7843ddfef44571494e4c86070 by Victor Stinner in 
branch 'master':
bpo-39406: os.putenv() avoids putenv_dict on Windows (GH-18126)
https://github.com/python/cpython/commit/0852c7dd52ac42e7843ddfef44571494e4c86070


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[issue24337] Implement `http.client.HTTPMessage.__repr__` to make debugging easier

[R. David Murray]

R. David Murray  added the comment:

Thanks for the PR, but I've noted an issue on the review.  In any case we 
should agree on what goes in the repr here in this issue before actually 
implementing anything.

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[issue24337] Implement `http.client.HTTPMessage.__repr__` to make debugging easier

[Zackery Spytz]

Change by Zackery Spytz :


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versions: +Python 3.9 -Python 3.5

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[issue24337] Implement `http.client.HTTPMessage.__repr__` to make debugging easier

[Zackery Spytz]

Change by Zackery Spytz :


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pull_request: https://github.com/python/cpython/pull/18127

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

[STINNER Victor]

Change by STINNER Victor :


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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

STINNER Victor  added the comment:


New changeset b73dd02ea744288831f71363a7467552c09875ea by Victor Stinner in 
branch 'master':
Revert "bpo-39413: Implement os.unsetenv() on Windows (GH-18104)" (GH-18124)
https://github.com/python/cpython/commit/b73dd02ea744288831f71363a7467552c09875ea


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[issue39361] [C API] Document PyTypeObject.tp_print removal in What's New In Python 3.9

[Ammar Askar]

Change by Ammar Askar :


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[issue39413] Implement os.unsetenv() on Windows

[STINNER Victor]

Change by STINNER Victor :


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

[STINNER Victor]

STINNER Victor  added the comment:

> I agree with deprecating binhex.

Good :-) It's now deprecated.

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

[STINNER Victor]

STINNER Victor  added the comment:


New changeset beea26b57e8c80f1eff0f967a0f9d083a7dc3d66 by Victor Stinner in 
branch 'master':
bpo-39353: Deprecate the binhex module (GH-18025)
https://github.com/python/cpython/commit/beea26b57e8c80f1eff0f967a0f9d083a7dc3d66


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[issue38076] Make struct module PEP-384 compatible

[Dino Viehland]

Dino Viehland  added the comment:

With either fix, or with both, on Linux I still see this hang at shutdown.  
Victor mentioned the fact that he had to hit Ctrl-C on Linux to see this, and I 
have to do the same thing. Then with the fixes in place the original test case 
still hangs on shutdown.  

On Python 3.7 (I don't readily have 3.8 available) at least this just runs and 
completes with no ctrl-C and no crashes.  So while either of the fixes may be 
good to prevent the crashes, there's still probably some underlying issue in 
multiprocessing.  I haven't tested on Mac OS/X.

It looks like the clearing was originally introduced here: 
https://bugs.python.org/issue10241  Interestingly there was a similar issue w/ 
_tkinter, which also used PyType_FromSpec (although it sounds like it was just 
a ref count issue on the type).  Unfortunately there's no associated test cases 
added to verify the behavior.  Antoine and Neil are both now on the PR which 
removes the collection behavior so hopefully they can chime in on the safety of 
that fix.

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[issue39400] pydoc: Use of MANPAGER variable is incorrect

[Roundup Robot]

Change by Roundup Robot :


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[issue39426] Pickler docstring misstates default and highest protocols

[Mark Dickinson]

Change by Mark Dickinson :


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[issue39426] Pickler docstring misstates default and highest protocols

[Mark Dickinson]

Mark Dickinson  added the comment:

> Do you want to submit a PR?

Not immediately. I'll add it to my to-do list, but definitely won't complain if 
someone else gets there first.

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[issue39426] Pickler docstring misstates default and highest protocols

[Antoine Pitrou]

Antoine Pitrou  added the comment:

Good catch.  Do you want to submit a PR?

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[issue39426] Pickler docstring misstates default and highest protocols

[Mark Dickinson]

New submission from Mark Dickinson :

>From the pickle.Pickler docstring:

> The optional *protocol* argument tells the pickler to use the given
> protocol; supported protocols are 0, 1, 2, 3 and 4.  The default
> protocol is 3; a backward-incompatible protocol designed for Python 3.

That's out of date since Python 3.8, where the default protocol is 4 and the 
highest available is 5. For future-proofing, it may be worth rewording the 
docstring to refer directly to the DEFAULT_PROTOCOL and HIGHEST_PROTOCOL 
constants.

--
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components: Documentation
messages: 360497
nosy: docs@python, mark.dickinson, pitrou
priority: normal
severity: normal
status: open
title: Pickler docstring misstates default and highest protocols
versions: Python 3.8, Python 3.9

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

[Brett Cannon]

Brett Cannon  added the comment:

The problem with the hybrid exception is that importlib would then still raise 
a different exception from import itself, so the discrepancy would persist. And 
if you updated import you could then break people in another way where they 
were catching ValueError and ImportError separately for different cases and now 
they would potentially catch the wrong exception for that ValueError case.

Basically changing what exceptions get raised sucks as someone is almost 
inevitably broken. But since import and importlib strive to mirror each other 
as much as possible and be drop-in replacements, the consistency for the next 
30 years of Python's life is more important I think than the case of:

1. Someone using importlib.import_module()
2. Who is specifically worried about relative imports going too far and no 
other import-related import and thus only catching ValueError and not 
ImportError
3. And are supporting older versions of Python
4. And will have a difficult time updating their `except` clause to now also 
capture ImportError

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[issue39422] datetime.datetime.strptime incorrectly interpretting format '%Y%m%d'

[Cleland Loszewski]

Cleland Loszewski  added the comment:

You're right, I did mean the second string to report '20200106'.  
Looking closer, I see that I was reading the documentation incorrectly and 
getting hung up on an introduced ambiguity.
```python
from datetime import datetime
print(datetime.strptime('2020016', '%Y%m%d'))
print(datetime.strptime('20200106', '%Y%m%d'))
print(datetime.strptime('202016', '%Y%m%d'))
print(datetime.strptime('2020106', '%Y%m%d'))
```

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stage:  -> resolved
status: pending -> closed

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[issue39425] list.count performance regression

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 9e06d61af30bac4fcacb7973f826147ccc010392 by Pablo Galindo (Miss 
Islington (bot)) in branch '3.7':
bpo-39425: Fix list.count performance regression (GH-18119) (GH-18121)
https://github.com/python/cpython/commit/9e06d61af30bac4fcacb7973f826147ccc010392


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[issue39425] list.count performance regression

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Thanks for the PR, Dong-hee Na :)

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[issue39425] list.count performance regression

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset fdb21609d944941f0732df72dc3d07a7a9a7efea by Pablo Galindo (Miss 
Islington (bot)) in branch '3.8':
bpo-39425: Fix list.count performance regression (GH-18119) (GH-18120)
https://github.com/python/cpython/commit/fdb21609d944941f0732df72dc3d07a7a9a7efea


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[issue35003] Provide an option to venv to put files in a bin/ directory on Windows

[Brett Cannon]

Change by Brett Cannon :


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

[Manuel Barkhau]

Change by Manuel Barkhau :


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[issue39425] list.count performance regression

[miss-islington]

Change by miss-islington :


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[issue39425] list.count performance regression

[miss-islington]

miss-islington  added the comment:


New changeset 14d80d0b605d8b148e14458e4c1853a940071462 by Miss Islington (bot) 
(Dong-hee Na) in branch 'master':
bpo-39425: Fix list.count performance regression (GH-18119)
https://github.com/python/cpython/commit/14d80d0b605d8b148e14458e4c1853a940071462


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[issue39425] list.count performance regression

[miss-islington]

Change by miss-islington :


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[issue39425] list.count performance regression

[Dong-hee Na]

Change by Dong-hee Na :


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versions: +Python 3.7

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[issue39420] Windows: convertenviron() doesn't parse environment variables properly

[Eryk Sun]

Eryk Sun  added the comment:

> The problem is that the _wputenv() function allows to insert variable 
> names containing the "=" character 

No, it does not. Your experiments uncovered bugs elsewhere with the 
implementations of _wgetenv and WINAPI GetEnvironmentVariableW, but this isn't 
one of them. _wputenv(L"victor==secret") updates the OS environment by calling 
SetEnvironmentVariableW(L"victor", L"=secret"). That is the only correct 
result. A variable name is only allowed to contain "=" as the first character, 
where it is unambiguous. The first "=" beyond the first character must be the 
value delimiter.

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[issue38495] print built-in function docs bug

[Julien Palard]

Julien Palard  added the comment:

PR 17062 about stating it's a space by default has been rejected.

I also feel we should just enhance the space width in the prototype.

I personally see the space, but as it's in italic, I can understand it's very 
easy to miss it.

I like the `font-family: monospace, sans-serif; font-style: normal;` a lot, it 
make it clear, see screenshot, but it's an issue for python-docs-theme, opening 
it there: https://github.com/python/python-docs-theme/issues/42

--
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nosy: +mdk
Added file: https://bugs.python.org/file48859/Screenshot_2020-01-22 Fonctions 
natives — Documentation Python 3 8 1.png

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[issue39425] list.count performance regression

[Dong-hee Na]

Change by Dong-hee Na :


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[issue39425] list.count performance regression

[Dong-hee Na]

Change by Dong-hee Na :


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pull_request: https://github.com/python/cpython/pull/18119

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[issue39425] list.count performance regression

[Dong-hee Na]

New submission from Dong-hee Na :

./python.exe -m pyperf timeit -s 'a = [1]*100'  'a.count(1)'

Current Master: Mean +- std dev: 1.05 us +- 0.03 us
My patch: Mean +- std dev: 423 ns +- 11 ns

This is the side-effect of pr 17022.

--
assignee: corona10
messages: 360488
nosy: corona10
priority: normal
severity: normal
status: open
title: list.count performance regression
type: performance
versions: Python 3.8, Python 3.9

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[issue39422] datetime.datetime.strptime incorrectly interpretting format '%Y%m%d'

[SilentGhost]

SilentGhost  added the comment:

They do not "report same datetime output". Did you mean to use '20200106' as 
the second input string? Because, leading zeros being optional for certain 
format specifiers is a documented feature of strptime.

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nosy: +SilentGhost
status: open -> pending

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[issue39424] test_signal: test_pidfd_send_signal() uses deprecated assertRaisesRegexp() method

[STINNER Victor]

New submission from STINNER Victor :

test_signal.test_pidfd_send_signal() should use assertRaisesRegex() rather than 
assertRaisesRegexp():

$ ./python -Werror -m test -v test_signal -m test_pidfd_send_signal 
(...)
==
ERROR: test_pidfd_send_signal (test.test_signal.PidfdSignalTest)
--
Traceback (most recent call last):
  File "/home/vstinner/python/master/Lib/test/test_signal.py", line 1292, in 
test_pidfd_send_signal
with self.assertRaisesRegexp(TypeError, "^siginfo must be None$"):
  File "/home/vstinner/python/master/Lib/unittest/case.py", line 1390, in 
deprecated_func
warnings.warn(
DeprecationWarning: Please use assertRaisesRegex instead.

--
components: Tests
keywords: newcomer friendly
messages: 360486
nosy: vstinner
priority: normal
severity: normal
status: open
title: test_signal: test_pidfd_send_signal() uses deprecated 
assertRaisesRegexp() method
versions: Python 3.9

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

[Anthony Sottile]

Anthony Sottile  added the comment:

sure, it's the standard PATHEXT (basically a fresh vm from modern.ie) -- the 
only reason I noticed this is I was reading the source: 
https://github.com/python/cpython/blob/5bbac8cbdf140ebce446ea4e7db2b20a5d7b8402/Lib/shutil.py#L1367-L1373



C:\Users\IEUser>echo %PATHEXT%
.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC;.PY;.PYW

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[issue39421] Use-after-free in heappushpop() of heapq module

[Dong-hee Na]

Dong-hee Na  added the comment:

@pablogsal

I agree with hotfix is needed and also for discussion.
I left a comment for PR 18118. Please take a look :)

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[issue39423] Process finished with exit code -1073741819 (0xC0000005) when trying to access data from a pickled file

[mapf]

mapf  added the comment:

I forgot to mention that sometimes, when I dump and load the data in the same 
session and try to access / use the data in question, I get the following Error:

"Fatal Python error: GC object already tracked"

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[issue39422] datetime.datetime.strptime incorrectly interpretting format '%Y%m%d'

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
nosy: +belopolsky, p-ganssle

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