[issue36552] Replace OverflowError with ValueError when calculating length of range objects > PY_SIZE_MAX

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue36778] test_site.StartupImportTests.test_startup_imports fails if default code page is cp65001

[Inada Naoki]

Inada Naoki  added the comment:

@Eryk I didn't say new Terminal will cause this issue.  I know ConsoeIO too.

I just meant Microsoft use cp65001 more widely for better UTF-8 support 
nowadays.
So I want to make cp65001 as alias of UTF-8.


> Python could similarly special case CP_UTF8 as "utf-8" in 
> _locale._getdefaultlocale.

I like this idea too.

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[issue31033] Add argument to .cancel() of Task and Future

[Alexander Mohr]

Alexander Mohr  added the comment:

@yselivanov even better :)

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[issue36831] ElementTree.find attribute matching with empty namespace

[Stefan Behnel]

Change by Stefan Behnel :


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[issue36831] ElementTree.find attribute matching with empty namespace

[Stefan Behnel]

Stefan Behnel  added the comment:

Sorry for the annoyance during the release.

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[issue36831] ElementTree.find attribute matching with empty namespace

[Stefan Behnel]

Stefan Behnel  added the comment:


New changeset 88db8bd0648588c67eeab16d0bc72ec5c206e3ad by Stefan Behnel in 
branch 'master':
bpo-36831: Do not apply default namespace to unprefixed attributes in 
ElementPath. (#13201)
https://github.com/python/cpython/commit/88db8bd0648588c67eeab16d0bc72ec5c206e3ad


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[issue30271] Make sqlite3 statement cache optional

[Raymond Hettinger]

Raymond Hettinger  added the comment:

> I do believe we should allow the user to disable the cache.

Why?

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[issue35668] Improve test coverage for idlelib

[anthony shaw]

Change by anthony shaw :


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[issue36500] Add "regen-*" equivalent projects for Windows builds

[anthony shaw]

Change by anthony shaw :


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[issue36551] Optimize list comprehensions with preallocate size and protect against overflow

[anthony shaw]

Change by anthony shaw :


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[issue36552] Replace OverflowError with ValueError when calculating length of range objects > PY_SIZE_MAX

[anthony shaw]

Change by anthony shaw :


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[issue36859] sqlite3 dml statement detection does not account for CTEs

[Charles]

Change by Charles :


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[issue36862] Add Visual Studio 2019 support to PCBuild/env.bat

[anthony shaw]

Change by anthony shaw :


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[issue36862] Add Visual Studio 2019 support to PCBuild/env.bat

[anthony shaw]

Change by anthony shaw :


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[issue36862] Add Visual Studio 2019 support to PCBuild/env.bat

[anthony shaw]

New submission from anthony shaw :

The PCBuild tool should support VS2019 but default to 2017 as per documentation.
PR to follow.

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title: Add Visual Studio 2019 support to PCBuild/env.bat
type: enhancement
versions: Python 3.8

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[issue36859] sqlite3 dml statement detection does not account for CTEs

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

CPython now accepts PRs on GitHub. Please try raising a PR as per devuguide : 
https://devguide.python.org/

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[issue36859] sqlite3 dml statement detection does not account for CTEs

[Charles]

Charles  added the comment:

I've got a patch working now that:

- retains complete backwards-compatibility for DDL (as well as BEGIN 
EXCLUSIVE/IMMEDIATE) -- tests are passing locally.
- retains previous behavior for old sqlite that do not have the 
sqlite3_stmt_readonly API.

I think this should be good-to-go and I've in fact merged a similar patch on my 
own standalone pysqlite3 package.

Also I will add that the little 'test script' I provided is working as-expected 
with this patch applied.

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[issue36861] Update to Unicode 12.1.0

[Benjamin Peterson]

Benjamin Peterson  added the comment:


New changeset 3aca40d3cb4b9b6741cf3073d71fbfc682cab96d by Benjamin Peterson in 
branch 'master':
closes bpo-36861: Update Unicode database to 12.1.0. (GH-13214)
https://github.com/python/cpython/commit/3aca40d3cb4b9b6741cf3073d71fbfc682cab96d


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[issue36861] Update to Unicode 12.1.0

[Benjamin Peterson]

Change by Benjamin Peterson :


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[issue36620] Documentation missing parameter for Itertools.zip_longest

[Ying Wang]

Ying Wang  added the comment:

@rhettinger should this issue be closed if no action is to be taken? If so, 
should I manually close the pull request referencing this issue, or will that 
be automatically handled by the Python bug tracker?

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[issue36859] sqlite3 dml statement detection does not account for CTEs

[Charles]

Charles  added the comment:

Oh, one more thing that is actually quite important -- since BEGIN IMMEDIATE 
and BEGIN EXCLUSIVE "modify" the database, these statements (intended to begin 
a transaction) are treated as "is_dml" when using the sqlite3_stmt_readonly API.

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[issue36620] Documentation missing parameter for Itertools.zip_longest

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Sorry, I don't want to do this in the summary table.  The goal of the table is 
to provide a minimal overview to help select the appropriate itertool and to 
provide a fast link to the details given below.

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[issue36778] test_site.StartupImportTests.test_startup_imports fails if default code page is cp65001

[Eryk Sun]

Eryk Sun  added the comment:

> FYI, I expect cp65001 will be used more widely in near future,
[...]
> It seems use `SetConsoleOutputCP(65001)` and `SetConsoleCP(65001)`.

Unless PYTHONLEGACYWINDOWSSTDIO is defined, Python 3.6+ doesn't use the 
console's codepage-based interface (except for low-level os.read and os.write). 
Console files uses the wide-character console API internally, and have a 
"utf-8" encoding. "cp65001" isn't a factor in this context.

This issue probably occurs due to the encoding returned by 
locale.getpreferredencoding(). This calls _locale._getdefaultlocale, which 
returns a tuple that mixes the user locale with the system ANSI codepage. For 
example, with ANSI set to UTF-8 (Windows 10):

>>> _locale._getdefaultlocale()
('en_GB', 'cp65001')

The Universal CRT special cases CP_UTF8 (codepage 65001) as "utf8" and accepts 
"utf-8" as an alias. For example, after setting the ANSI codepage to UTF-8:

>>> locale.setlocale(locale.LC_CTYPE, '')
'English_United Kingdom.utf8'

Python could similarly special case CP_UTF8 as "utf-8" in 
_locale._getdefaultlocale.

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[issue36859] sqlite3 dml statement detection does not account for CTEs

[Charles]

Charles  added the comment:

Sqlite since 3.7.11 provides sqlite3_stmt_readonly() API for determining if a 
prepared statement will affect the database. I made the change, removing the 
SQL scanning code and replacing it with:

self->is_dml = !sqlite3_stmt_readonly(self->st);

But then I see a number of test failures, mostly related to the fact that 
table-creation is now treated as "is_dml" with the above change.

I don't know if the above API is going to be a workable path forward, since it 
seems like DML statements *not* automatically starting a transaction is a 
behavior a lot of people may have come to depend on (whether or not it is 
correct).

I've attached a patch just-in-case anyone's interested.

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[issue36861] Update to Unicode 12.1.0

[Benjamin Peterson]

New submission from Benjamin Peterson :

A minor release of Unicode 12 has been issued to pick up the Reiwa ligature: 
http://blog.unicode.org/2019/05/unicode-12-1-en.html

We're already using Unicode 12.0.0, so this is will be a very minor upgrade.

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title: Update to Unicode 12.1.0

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[issue36860] Inconsistent/Undocumented behavior with pathlib resolve and absolute on Windows

[Alex]

New submission from Alex :

Maybe I am doing something wrong here but:

On Windows 10:
> python --version
Python 3.7.1
> python 
>>> from pathlib import Path
>>> Path("test.py").resolve()
WindowsPath('test.py')
>>> Path("test.py").absolute()  # this is undocumented in 
>>> https://docs.python.org/3.7/library/pathlib.html
WindowsPath('C:/Users/Name/Desktop/test.py')

On Ubuntu 18.04 LTS:
$ python3.7 --version
Python 3.7.3
$ python3.7
>>> from pathlib import Path
>>> Path("test.py").resolve()
PosixPath('/home/name/test.py')
>>> Path("test.py").absolute()  # same as above undocumented
PosixPath('/home/name/test.py')

Why in Windows does this fail, but not Linux? Why is .absolute() undocumented? 
I've looked around trying to figure out what the intended behavior is but there 
is conflicting information.

Resolve seems to not work correctly on Windows. Bug?

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messages: 341953
nosy: alexjacobson95, eryksun, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Inconsistent/Undocumented behavior with pathlib resolve and absolute on 
Windows
type: behavior
versions: Python 3.7

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[issue24263] unittest cannot load module whose name starts with Unicode

[anthony shaw]

anthony shaw  added the comment:

thanks, will wait for a review from Serhiy, Rbcollins or ezio

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[issue12188] PEP 7 (or guide) add C style policies and explanation

[anthony shaw]

anthony shaw  added the comment:

Hi,

This discussion came to a stop, but it doesn't seem conclusive.

PEP discussions are now in GitHub on https://github.com/python/peps/issues so 
I'm going to close this BPO issue.

There is no additional section in PEP 7 for this level of detail, there is also 
no tooling in place (afaik) to retroactively apply or inspect these types of 
issues, so this would need to be discussed in the PEP issue,

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[issue36832] Port zipp to zipfile

[Jason R. Coombs]

Change by Jason R. Coombs :


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[issue36816] self-signed.pythontest.net TLS certificate key is too weak

[Gregory P. Smith]

Gregory P. Smith  added the comment:


New changeset 7b5dca8345f4a909367836a3a2c3c7ac6e4e2c0c by Gregory P. Smith in 
branch '2.7':
[2.7] bpo-36816: Update the self-signed.pythontest.net cert (GH-13192) 
(GH-13199)
https://github.com/python/cpython/commit/7b5dca8345f4a909367836a3a2c3c7ac6e4e2c0c


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[issue24538] os.setxattr PermissionError on panfs propagates up causing `copystat`, `copytree`, and `pip install .` to fail unhepfully

[Roundup Robot]

Change by Roundup Robot :


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[issue36859] sqlite3 dml statement detection does not account for CTEs

[Charles]

New submission from Charles :

In statement.c, there is some logic which detects whether or not an incoming 
statement is a DML-type. The logic, as of 2019-05-08, I am referring to is 
here: 
https://github.com/python/cpython/blob/fc662ac332443a316a120fa5287c235dc4f8739b/Modules/_sqlite/statement.c#L78-L93

To demonstrate the bug:

import sqlite3

conn = sqlite3.connect(':memory:')

conn.execute('create table kv ("key" text primary key, "value" integer)')
conn.execute('insert into kv (key, value) values (?, ?), (?, ?)',
 ('k1', 1, 'k2', 2))

assert conn.in_transaction  # Yes we are in a transaction.
conn.commit()
assert not conn.in_transaction  # Not anymore, as expected.

rc = conn.execute(
'with c(k, v) as (select key, value + 10 from kv) '
'update kv set value=(select v from c where k=kv.key)')

print(rc.rowcount)  # Should be 2, prints "-1".
#assert conn.in_transaction  # !!! Fails.

curs = conn.execute('select * from kv order by key;')
print(curs.fetchall())  # [('k1', 11), ('k2', 12)]

--
components: Library (Lib)
messages: 341949
nosy: coleifer
priority: normal
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status: open
title: sqlite3 dml statement detection does not account for CTEs
type: behavior

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[issue36789] Unicode HOWTO incorrectly states that UTF-8 contains no zero bytes

[mbiggs]

mbiggs  added the comment:

Ah sent a pull request but didn't realize that redshiftzero already had.  Their 
PR looks good to me.

Thanks for fixing this!

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[issue36778] test_site.StartupImportTests.test_startup_imports fails if default code page is cp65001

[Paul Monson]

Paul Monson  added the comment:

Removing import functools from cp65001.py fixes test_startup_imports.

Victor proposed this PR: https://github.com/python/cpython/pull/13110
but new test_codecs fails because it's passing self on to the lambda I think.

I tried to build on Victor's change but there is still one test failure I 
haven't tracked down yet: https://github.com/python/cpython/pull/13211

FAIL: test_incremental_surrogatepass (test.test_codecs.CP65001Test)
--
Traceback (most recent call last):
  File "C:\master\pythond\lib\test\test_codecs.py", line 436, in 
test_incremental_surrogatepass
self.assertEqual(dec.decode(data[i:], True), '\uD901')
AssertionError: '' != '\ud901'
+ \ud901

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[issue36816] self-signed.pythontest.net TLS certificate key is too weak

[miss-islington]

miss-islington  added the comment:


New changeset 6daaf3f7de78eec2c80eaa8e94e4cca54f758a30 by Miss Islington (bot) 
(Gregory P. Smith) in branch '3.7':
[3.7] bpo-36816: Update the self-signed.pythontest.net cert (GH-13192) 
(GH-13197)
https://github.com/python/cpython/commit/6daaf3f7de78eec2c80eaa8e94e4cca54f758a30


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[issue36778] test_site.StartupImportTests.test_startup_imports fails if default code page is cp65001

[Paul Monson]

Change by Paul Monson :


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[issue35900] Add pickler hook for the user to customize the serialization of user defined functions and types.

[Antoine Pitrou]

Antoine Pitrou  added the comment:

Both PRs are now merged.  Thank you Pierre!

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[issue35900] Add pickler hook for the user to customize the serialization of user defined functions and types.

[Antoine Pitrou]

Antoine Pitrou  added the comment:


New changeset 289f1f80ee87a4baf4567a86b3425fb3bf73291d by Antoine Pitrou 
(Pierre Glaser) in branch 'master':
bpo-35900: Enable custom reduction callback registration in _pickle (GH-12499)
https://github.com/python/cpython/commit/289f1f80ee87a4baf4567a86b3425fb3bf73291d


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[issue14353] Proper gettext support in locale module

[Toshio Kuratomi]

Toshio Kuratomi  added the comment:

As this problem does not affect Python3 I think it's up to the 2.7 release 
manager to decide if it should be merged.  benjamin, what do you think?  If you 
want it, I'll open a PR on github for it.

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[issue6981] locale.getdefaultlocale() envvars default code and documentation mismatch

[Toshio Kuratomi]

Toshio Kuratomi  added the comment:

Hey doko, I was just looking through the oldest gettext bugs and found this bug 
open.  It was caused by your commits here: https://bugs.python.org/issue1166948 
.   It feels like we have a few choices:

* revert the LANGUAGE ordering change which would take us back to the 2.6 
behaviour. 
* update the documentation to reflect the new ordering [Since the change has 
been around for so long, I think this is my personal favorite]
* Remove LANGUAGE from setting the defaultlocale because the GNU gettext usage 
of this variable is actually very different than what we're doing here.  It 
seems like it should only affect LC_MESSAGES and should affect those only as a 
fallback.
* Revert the LANGUAGE ordering change to the beginning of the list but remove 
it from consideration as a source for the *encoding*.

what do you think?

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[issue36858] f-string '=' debugging output needs to be documented

[Eric V. Smith]

New submission from Eric V. Smith :

There are two problems here: what to call this feature, and where to put it.

The current f-string documentation is in Doc/reference/lexical_analysis.rst, 
which I'm not sure is the best place to add discussion about how this feature 
works. This feature is run-time behavior, and goes beyond what the lexer 
documentation should show.

--
assignee: docs@python
components: Documentation
messages: 341941
nosy: docs@python, eric.smith
priority: normal
severity: normal
status: open
title: f-string '=' debugging output needs to be documented
type: enhancement
versions: Python 3.8

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[issue36817] Add = to f-strings for easier debugging.

[Eric V. Smith]

Change by Eric V. Smith :


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[issue36817] Add = to f-strings for easier debugging.

[Eric V. Smith]

Eric V. Smith  added the comment:


New changeset 9a4135e939bc223f592045a38e0f927ba170da32 by Eric V. Smith in 
branch 'master':
bpo-36817: Add f-string debugging using '='. (GH-13123)
https://github.com/python/cpython/commit/9a4135e939bc223f592045a38e0f927ba170da32


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[issue35495] argparse does not honor default argument for nargs=argparse.REMAINDER argument

[Michael Blahay]

Michael Blahay  added the comment:

Ryan, I have reviewed the documentation at 
https://docs.python.org/3/library/argparse.html#nargs and must admit that there 
is not a definitive answer that I can see regarding the defined behavior should 
there be no command line arguments that are in fact remaining. One could 
certainly argue that the empty list is the expression of the fact that no 
remaining arguments could be found. One can also argue that when seeking the 
remaining arguments, a list that may be zero to many elements in size, that by 
definition there cannot be a default.

Can you cite any documentation that would support your claim?

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[issue35495] argparse does not honor default argument for nargs=argparse.REMAINDER argument

[Michael Blahay]

Michael Blahay  added the comment:

Okay, so the expected output after running parse.parse_args([]) is 
Namespace(['nothing'])

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[issue36620] Documentation missing parameter for Itertools.zip_longest

[Roundup Robot]

Change by Roundup Robot :


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[issue36843] AIX build fails with failure to get random numbers

[Robert Boehne]

Robert Boehne  added the comment:

Reading a few bytes from /dev/urandom via dd:


robb@nepal:/raid/checkouts-raid/robb/nepal/build-py37$ dd if=/dev/urandom 
bs=256 count=1
??S?(#L???~]?B?^??8?f&?_|Vi??@??[joG>St??;?$?1?*??24???RD?"4`??aҼ#???f???
?}  
 ??^zC?@?"?.^?gn??p?t?R*=Ӫ?8*?L??   
8??bu?߂???8?Ŵ?`??y??٫K?.?~陵#5?t??h?e!?G@)B?R???(9kLX??BUH5=?||??El???a+n@??V?c?N?^ͯ?y?n??]??$݇?Mp?,#???K?i8?`?v??~`L?1+0
 records in.
1+0 records out.
robb@nepal:/raid/checkouts-raid/robb/nepal/build-py37$ dd if=/dev/urandom 
bs=256 count=1
_d?(?n???1bRԺ{??I??"Ѱ"|???E
   p??^??q#??
~yZ$u??e}?3?qw#?{*T1+0 records 
in.nR)?-?B???x??{~hϼ+?7۪شVW??"?d?n??V??t??R(\YC?3=?p?-ӽ?m??P???A?M??68??9Y?](??xn+?a?ܯ?W
1+0 records out.
robb@nepal:/raid/checkouts-raid/robb/nepal/build-py37$

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[issue36857] bisect should support descending order

[Rémi Lapeyre]

Rémi Lapeyre  added the comment:

If issue4356 is accepted, I think it may be possible to use `key=lambda e: -e`.

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[issue24882] ThreadPoolExecutor doesn't reuse threads until #threads == max_workers

[Brian Quinlan]

Brian Quinlan  added the comment:

After playing with it for a while, https://github.com/python/cpython/pull/6375 
seems reasonable to me.

It needs tests and some documentation.

Antoine, are you still -1 because of the complexity increase?

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[issue36857] bisect should support descending order

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Sorry, I don't think this is a worthwhile API extension.  The bisect module is 
primarily about searching for cut points between ranges.  For your use case, 
consider using blist or one of the many ordered collection recipes on PyPI (for 
example: http://www.grantjenks.com/docs/sortedcollections/ ).

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stage:  -> resolved
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[issue35900] Add pickler hook for the user to customize the serialization of user defined functions and types.

[Antoine Pitrou]

Antoine Pitrou  added the comment:


New changeset 65d98d0f53f558d7c799098da0abf376068c15fd by Antoine Pitrou 
(Pierre Glaser) in branch 'master':
bpo-35900: Add a state_setter arg to save_reduce (GH-12588)
https://github.com/python/cpython/commit/65d98d0f53f558d7c799098da0abf376068c15fd


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[issue35924] curses segfault resizing window

[Toshio Kuratomi]

Change by Toshio Kuratomi :


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

[Charalampos Stratakis]

Charalampos Stratakis  added the comment:

A small clarification on the differences of those two CVE's.

CVE-2019-9740: CLRF sequences are not properly handled in python built-in 
modules urllib/urllib2 in the query part of the url parameter of urlopen() 
function

CVE-2019-9947: CLRF sequences are not properly handled in python built-in 
modules urllib/urllib2 in the path part of the url parameter of urlopen() 
function

--
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versions: +Python 3.7

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[issue36816] self-signed.pythontest.net TLS certificate key is too weak

[Ned Deily]

Ned Deily  added the comment:


New changeset 2b9d7abdbd4b41e2c624858f5bc80da59d8a681d by Ned Deily (Gregory P. 
Smith) in branch '3.6':
[3.6] bpo-36816: Update the self-signed.pythontest.net cert (GH-13192) 
(GH-13198)
https://github.com/python/cpython/commit/2b9d7abdbd4b41e2c624858f5bc80da59d8a681d


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[issue29779] New environment variable PYTHONHISTORY

[Zackery Spytz]

Change by Zackery Spytz :


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[issue36843] AIX build fails with failure to get random numbers

[Robert Boehne]

Robert Boehne  added the comment:

The call to open("/dev/urandom", flags) is returning -1, and errno is set to 
22, EINVAL - Invalid argument.  could the flags be set incorrectly?

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[issue36620] Documentation missing parameter for Itertools.zip_longest

[Ying Wang]

Ying Wang  added the comment:

I would like to take a stab at this as a first-time CPython contributor.

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[issue36843] AIX build fails with failure to get random numbers

[Robert Boehne]

Robert Boehne  added the comment:

Opening /dev/urandom seems to return -1

(dbx) print buffer
0x09001000a5f49380 
(dbx) print size
24 
(dbx) print raise
0 
(dbx) step
stopped in dev_urandom at line 311 in file 
"/raid/checkouts-raid/robb/nepal/build-py37/../../Python-3.7.3/Python/bootstrap_hash.c"
 ($t1)
  311   if (raise) {
(dbx) step
stopped in dev_urandom at line 378 in file 
"/raid/checkouts-raid/robb/nepal/build-py37/../../Python-3.7.3/Python/bootstrap_hash.c"
 ($t1)
  378   fd = _Py_open_noraise("/dev/urandom", O_RDONLY);
(dbx) next
stopped in dev_urandom at line 379 in file 
"/raid/checkouts-raid/robb/nepal/build-py37/../../Python-3.7.3/Python/bootstrap_hash.c"
 ($t1)
  379   if (fd < 0) {
(dbx) print fd
-1 
(dbx) step
stopped in dev_urandom at line 380 in file 
"/raid/checkouts-raid/robb/nepal/build-py37/../../Python-3.7.3/Python/bootstrap_hash.c"
 ($t1)
  380   return -1;
(dbx) step
stopped in dev_urandom at line 401 in file 
"/raid/checkouts-raid/robb/nepal/build-py37/../../Python-3.7.3/Python/bootstrap_hash.c"
 ($t1)
  401   }
(dbx) step
stopped in pyurandom at line 519 in file 
"/raid/checkouts-raid/robb/nepal/build-py37/../../Python-3.7.3/Python/bootstrap_hash.c"
 ($t1)
  519   }
(dbx) step
stopped in unnamed block in _Py_HashRandomization_Init at line 611 in file 
"/raid/checkouts-raid/robb/nepal/build-py37/../../Python-3.7.3/Python/bootstrap_hash.c"
 ($t1)
  611   if (res < 0) {
(dbx) step
stopped in unnamed block in _Py_HashRandomization_Init at line 612 in file 
"/raid/checkouts-raid/robb/nepal/build-py37/../../Python-3.7.3/Python/bootstrap_hash.c"
 ($t1)
  612   return _Py_INIT_USER_ERR("failed to get random numbers "
(dbx) continue
continue
^ unrecognized command
(dbx) cont
Fatal Python error: _Py_HashRandomization_Init: failed to get random numbers to 
initialize Python

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[issue30271] Make sqlite3 statement cache optional

[Berker Peksag]

Berker Peksag  added the comment:

I'd prefer disabling statement cache implicitly when set_authorizer() is 
called. There's no need to expose this to end users.

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

[Miro Hrončok]

Change by Miro Hrončok :


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[issue36778] test_site.StartupImportTests.test_startup_imports fails if default code page is cp65001

[Steve Dower]

Steve Dower  added the comment:

The XP/Vista change is just context - we don't have to worry about OS that old 
any more.

If we remove the functools.partial call, does that help?

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[issue35924] curses segfault resizing window

[Toshio Kuratomi]

Toshio Kuratomi  added the comment:

My upstream (ncurses) bug report: 
http://lists.gnu.org/archive/html/bug-ncurses/2019-05/msg00010.html

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[issue36857] bisect should support descending order

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


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[issue36778] test_site.StartupImportTests.test_startup_imports fails if default code page is cp65001

[Paul Monson]

Paul Monson  added the comment:

cp65001 is the default codepage on Windows IoT Core and Windows NanoServer.  

There is also an option in control panel in Windows desktop 1809 (version 
17763) and greater which changes the default codepage to cp65001. 
1. Run control.exe
2. Click Clock and Region> change date, time or number formats
3. Click administrative tab
4. Click "Change System locale..." button
5. Check "Beta: Use Unicode UTF-8 for worldwide language support"
6. Click OK twice.
7. You will be prompted to reboot.

> Code page 65001 handles lone surrogate differently on Windows XP and older.

If I read the docs correctly a lone surrogate is an error.  I don't think a 
corner case like handling errors differently makes cp65001 not UTF-8.  Am I 
misunderstanding this point?
Also, Why is Windows XP still relevant in this discussion?

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[issue27639] UserList.__getitem__ doesn't account for slices

[Michael Blahay]

Michael Blahay  added the comment:

PR 13150, the recreation of PR 4981, was noticed just after I created PR 13169. 
It was decided to continue forward with PR 13169 since PR 13150 contained 
changes that were out of scope for BPO-27639 for which it was suspected might 
have been the cause of the non-merging of PR 4981. Thank for identifying 
Dmitry; I did my best to give credit where credit was due.

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[issue36856] faulthandler._stack_overflow doesn't work on x86-linux with KPTI enabled

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Are uintptr_t overflow/underflow semantics a defined behavior?

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[issue36857] bisect should support descending order

[John Belmonte]

New submission from John Belmonte :

because "list.pop()"

use case: maintain large ordered list and efficiently remove min item

list.pop() is O(1) but yields the max item.  There is no efficient removal of 
the min item.

list is by far the fastest collection to use with insort().  While deque offers 
O(1) popleft(), insort() performance with deque is not acceptable.

Lack of descending support in bisect necessitates workarounds such as using 
negative-valued items, which hurts code readability and moreover assumes that 
values are numbers.

--
components: Library (Lib)
messages: 341921
nosy: John Belmonte
priority: normal
severity: normal
status: open
title: bisect should support descending order
type: enhancement

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[issue36856] faulthandler._stack_overflow doesn't work on x86-linux with KPTI enabled

[Xi Ruoyao]

Xi Ruoyao  added the comment:

> Are uintptr_t overflow/underflow semantics a defined behavior?

Yes.  Unlike signed overflow, unsigned overflow is defined to be 2's 
complement.  The problem is this overflow results a wrong stack pointer limit 
and breaks _stack_overflow.

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[issue35813] shared memory construct to avoid need for serialization between processes

[Pam McA'Nulty]

Pam McA'Nulty  added the comment:

Reviewing docs and am writing a queue implementation for usability testing.  I 
think ShareableList needs to support `close()` and `unlink()` directly.  The 
`.shm` attribute should be considered an _implementation_ detail, and not be 
exposed.

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[issue36856] faulthandler._stack_overflow doesn't work on x86-linux with KPTI enabled

[Xi Ruoyao]

Change by Xi Ruoyao :


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pull_requests: +13116
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[issue26903] ProcessPoolExecutor(max_workers=64) crashes on Windows

[miss-islington]

Change by miss-islington :


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[issue26903] ProcessPoolExecutor(max_workers=64) crashes on Windows

[Steve Dower]

Steve Dower  added the comment:


New changeset 39889864c09741909da4ec489459d0197ea8f1fc by Steve Dower (Brian 
Quinlan) in branch 'master':
bpo-26903: Limit ProcessPoolExecutor to 61 workers on Windows (GH-13132)
https://github.com/python/cpython/commit/39889864c09741909da4ec489459d0197ea8f1fc


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[issue24882] ThreadPoolExecutor doesn't reuse threads until #threads == max_workers

[Brian Quinlan]

Brian Quinlan  added the comment:

When I first wrote and started using ThreadPoolExecutor, I had a lot of code 
like this:

with ThreadPoolExecutor(max_workers=500) as e:
  e.map(download, images)

I didn't expect that `images` would be a large list but, if it was, I wanted 
all of the downloads to happen in parallel.

I didn't want to have to explicitly take into account the list size when 
starting the executor (e.g. max_works=min(500, len(images))) but I also didn't 
want to create 500 threads up front when I only needed a few.

My use case involved transient ThreadPoolExecutors so I didn't have to worry 
about idle threads.

In principle, I'd be OK with trying to avoid unnecessary thread creation if the 
implementation can be simple and efficient enough.

https://github.com/python/cpython/pull/6375 seems simple enough but I haven't 
convinced myself that it works yet ;-)

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[issue27639] UserList.__getitem__ doesn't account for slices

[Michael Blahay]

Change by Michael Blahay :


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[issue36783] No documentation for _FromXandFold C API functions

[Roundup Robot]

Change by Roundup Robot :


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[issue36540] PEP 570: Python Positional-Only Parameters

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue36831] ElementTree.find attribute matching with empty namespace

[Stefan Behnel]

Change by Stefan Behnel :


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[issue24758] unittest.mock.Mock's new "unsafe" feature needs a better error message

[Kushal Das]

Kushal Das  added the comment:


New changeset b9b08cd948de97d756a199b60becce8397a8c882 by Kushal Das (Zackery 
Spytz) in branch 'master':
bpo-24758: Improve the error msg for unittest.mock.Mock()'s unsafe mode (#12991)
https://github.com/python/cpython/commit/b9b08cd948de97d756a199b60becce8397a8c882


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[issue36816] self-signed.pythontest.net TLS certificate key is too weak

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue31033] Add argument to .cancel() of Task and Future

[Carl Meyer]

Change by Carl Meyer :


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[issue36816] self-signed.pythontest.net TLS certificate key is too weak

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue36856] faulthandler._stack_overflow doesn't work on x86-linux with KPTI enabled

[SilentGhost]

Change by SilentGhost :


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[issue36856] faulthandler._stack_overflow doesn't work on x86-linux with KPTI enabled

[Xi Ruoyao]

New submission from Xi Ruoyao :

In faulthandler.c STACK_OVERFLOW_MAX_SIZE is defined to 100 * 1024 * 1024 
(100MB).  But recently KPTI has been applied to mitigate Meltdown 
(CVE-2017-5754) so the userspace stack pointer may be very close to 0x 
on Linux systems with 32-bit x86.  For example, on my laptop it's sometimes 
0xcc20.   So the expression

sp + STACK_OVERFLOW_MAX_SIZE

overflows and becomes a very small number.  That causes 
faulthandler._stack_overflow() to bail out after only one recursive call:

Traceback (most recent call last):
  File "", line 1, in 
RuntimeError: unable to raise a stack overflow (allocated 4124 bytes on the 
stack, 1 recursive calls)

--
components: Extension Modules
messages: 341915
nosy: xry111
priority: normal
severity: normal
status: open
title: faulthandler._stack_overflow doesn't work on x86-linux with KPTI enabled
type: behavior
versions: Python 3.7

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[issue36816] self-signed.pythontest.net TLS certificate key is too weak

[Gregory P. Smith]

Change by Gregory P. Smith :


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[issue36841] Supporting customization of float encoding in JSON

[Mitar]

Mitar  added the comment:

That would be awesome!

BTW, just as an additional example, JavaScrpt's JSON.stringify encodes NaN and 
Infinity to null. By having a custom function I could for example try to match 
such implementation.

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[issue35925] test_httplib test_nntplib test_ssl fail on ARMv7 Debian buster bot (OpenSSL 1.1.1a)

[Julien Palard]

Julien Palard  added the comment:



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[issue36855] update tests relying on a copy of a TLS certificate (pem) to support two versions

[Gregory P. Smith]

New submission from Gregory P. Smith :

We're having pain today due to the Lib/test/selfsigned_pythontestdotnet.pem 
certificate update sychronization.

This wouldn't be painful if our tests relying on a specific certificate 
matching something elsewhere on the network supported multiple possible 
certificates.  Specifically an old and a new cert.  When doing that, we could 
go ahead and commit the new cert, moving the existing one to old, before 
flipping the update on the test infrastructure.  in all branches.

that'd prevent massive PR CI and buildbot failure fallout.

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components: Tests
messages: 341912
nosy: gregory.p.smith
priority: normal
severity: normal
stage: needs patch
status: open
title: update tests relying on a copy of a TLS certificate (pem) to support two 
versions
type: enhancement
versions: Python 3.7, Python 3.8

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[issue36852] Python3.7.2 fails to cross-compile (yocto / openembedded) when target is mips softfloat

[SilentGhost]

Change by SilentGhost :


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[issue24851] infinite loop in faulthandler._stack_overflow

[Xi Ruoyao]

Change by Xi Ruoyao :


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versions: +Python 3.7

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[issue36854] GC operates out of global runtime state.

[Eric Snow]

New submission from Eric Snow :

(also see #24554)

We need to move GC state from _PyRuntimeState to PyInterpreterState.

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assignee: eric.snow
components: Interpreter Core
messages: 341911
nosy: eric.snow, pablogsal
priority: normal
severity: normal
status: open
title: GC operates out of global runtime state.
versions: Python 3.8

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[issue36816] self-signed.pythontest.net TLS certificate key is too weak

[Gregory P. Smith]

Change by Gregory P. Smith :


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pull_requests: +13108

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[issue36843] AIX build fails with failure to get random numbers

[STINNER Victor]

STINNER Victor  added the comment:

Ok, so Python uses /dev/urandom. Can you try to read a few bytes from it? Like 
256 bytes. You can try my dd command.

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[issue35712] Make NotImplemented unusable in boolean context

[Josh Rosenberg]

Josh Rosenberg  added the comment:

I've submitted a PR for this. I did discover a use case for boolean evaluation 
while doing this in the functools.total_ordering helpers. While it's 
legitimate, it *looks* wrong (the code looks like it didn't consider the 
possibility of NotImplemented even though it did), and really only applies to 
the case total_ordering handles on behalf of most folks (implementing one 
comparator in terms of two others).

The specific case was:

def _le_from_lt(self, other, NotImplemented=NotImplemented):
 'Return a <= b.  Computed by @total_ordering from (a < b) or (a == b).'
 op_result = self.__lt__(other)
 return op_result or self == other

(with a similar implementation for _ge_from_gt). It happens to work because the 
return value of __lt__ is used directly for both True and NotImplemented cases, 
with only False delegating to equality. It's not at all clear that that's 
correct at first glance though, and the fix to avoid the warning is simple, 
matching the other 10 comparator helpers by explicit checking for 
NotImplemented via:

if op_result is NotImplemented:
return NotImplemented

That's about the strongest case I can find for "legitimate" use of 
NotImplemented in a boolean context, so I figured I'd point it out explicitly 
so people knew it existed.

If that makes an eventual TypeError a non-starter, I'd still like that usage to 
emit a warning (e.g. a RuntimeWarning) simply because the utility of that one 
little shortcut pales in comparison to the damage done by the *many* misuses 
that occur.

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[issue36852] Python3.7.2 fails to cross-compile (yocto / openembedded) when target is mips softfloat

[Roundup Robot]

Change by Roundup Robot :


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pull_requests: +13107

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[issue36816] self-signed.pythontest.net TLS certificate key is too weak

[miss-islington]

miss-islington  added the comment:


New changeset 6bd81734de0b73f1431880d6a75fb71bcbc65fa1 by Miss Islington (bot) 
(Gregory P. Smith) in branch 'master':
bpo-36816: Update the self-signed.pythontest.net cert (GH-13192)
https://github.com/python/cpython/commit/6bd81734de0b73f1431880d6a75fb71bcbc65fa1


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nosy: +miss-islington

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[issue31873] Inconsistent capitalization of proper noun - Unicode.

[miss-islington]

miss-islington  added the comment:


New changeset ed8860c5af87d78d312ae30dd2d6bedc60bd86e5 by Miss Islington (bot) 
in branch '3.7':
bpo-31873: Update unicode.rst - 'unicode' capitalization (GH-4125)
https://github.com/python/cpython/commit/ed8860c5af87d78d312ae30dd2d6bedc60bd86e5


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

[Ned Deily]

Ned Deily  added the comment:


New changeset c50d437e942d4c4c45c8cd76329b05340c02eb31 by Ned Deily (Miro 
Hrončok) in branch '3.6':
bpo-30458: Disallow control chars in http URLs. (GH-12755) (GH-13155)
https://github.com/python/cpython/commit/c50d437e942d4c4c45c8cd76329b05340c02eb31


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[issue24048] remove_module() needs to save/restore exception state

[Nick Coghlan]

Nick Coghlan  added the comment:


New changeset 94a64e9cd411a87514b68082c1c437eb3b49dfb9 by Nick Coghlan (Zackery 
Spytz) in branch 'master':
bpo-24048: Save the live exception during import.c's remove_module() (GH-13005)
https://github.com/python/cpython/commit/94a64e9cd411a87514b68082c1c437eb3b49dfb9


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[issue36841] Supporting customization of float encoding in JSON

[Wei Lee]

Wei Lee  added the comment:

If no one is working on it, I'd like to give it a try.

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[issue35925] test_httplib test_nntplib test_ssl fail on ARMv7 Debian buster bot (OpenSSL 1.1.1a)

[Gregory P. Smith]

Gregory P. Smith  added the comment:

thats https://bugs.python.org/issue36816 (separate issue as our infrastructure 
is fixed to have a modern certificate).  PR pending automerge post-CI.

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