[issue39529] Deprecate get_event_loop()

[Min RK]

Min RK  added the comment:

The comments in this thread suggest that `set_event_loop` should also be 
deprecated, but it hasn't been. It doesn't seem to have any use without 
`get_event_loop()`.

I'm trying to understand the consequences of these changes for IPython, and 
make the changes intended by asyncio folks, but am not quite clear, yet.

If I understand it correctly, this means that the whole concept of a 'current' 
event loop is deprecated while no event loop is running?

My interpretation of these changes is that it means any persistent handles on 
any event loop while it isn't running is fully the responsibility of individual 
libraries (e.g. tornado, IPython).

This is coming up in IPython where we need a handle on the event loop and 
advance it with `run_until_complete` for each iteration (it should be the same 
loop to maintain persistent state across advances, so `asyncio.run()` would not 
be appropriate). We previously relied on `get_event_loop` to manage this 
handle, but I think we have to now shift to tracking our own handle, and can no 
longer rely on standard APIs to track a shared instance across packages.

--
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[issue11352] Update cgi module doc

[Irit Katriel]

Irit Katriel  added the comment:

Marking as easy. What needs to be done here is to review the patches and see if 
there are any doc improvements in them worth having. Then make a PR.

--
keywords: +easy, newcomer friendly

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[issue45943] Spam

[Zachary Ware]

Change by Zachary Ware :


Removed file: https://bugs.python.org/file50463/PSX_20210903_080553.jpg

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[issue45943] Spam

[Zachary Ware]

Change by Zachary Ware :


--
components:  -email
nosy:  -barry, oktaine57, r.david.murray
title: kids10yrsap...@gmail.com -> Spam
type: behavior -> 
versions:  -Python 3.11

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[issue45944] Avoid calling isatty() for most open() calls

[Collin Anderson]

New submission from Collin Anderson :

isatty() is a system call on linux. Most open()s are files, and we're already 
getting the size of the file. If it has a size, then we know it's not a atty, 
and can avoid calling it.

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[issue45944] Avoid calling isatty() for most open() calls

[Collin Anderson]

Change by Collin Anderson :


--
keywords: +patch
pull_requests: +28096
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/29870

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[issue45944] Avoid calling isatty() for most open() calls

[Collin Anderson]

Change by Collin Anderson :


--
components: IO
nosy: collinanderson
priority: normal
severity: normal
status: open
title: Avoid calling isatty() for most open() calls
type: performance
versions: Python 3.10, Python 3.11, Python 3.6, Python 3.7, Python 3.8, Python 
3.9

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[issue45943] kids10yrsap...@gmail.com

[Jelle Zijlstra]

Change by Jelle Zijlstra :


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

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[issue31042] Inconsistency in documentation of operator.index

[Joseph Fox-Rabinovitz]

Joseph Fox-Rabinovitz  added the comment:

I closed the issue (it's already been rejected), primarily based on

> a.__index__ =  is an unauthorized use of a *reserved* word and the 
> effect of such usage is not and need not be documented.  

> The entry for __*__ does include "*Any* use of __*__ names, in any context, 
> that does not follow explicitly documented use, is subject to breakage 
> without warning."  To me, that says that the effect of the reserved-word 
> assignment is undefined.  It could be made to raise an exception.

It's like filing a bug report for UB in C.

--
stage: needs patch -> resolved
status: pending -> closed

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[issue27779] Sync-up docstrings in C version of the the decimal module

[Raymond Hettinger]

Raymond Hettinger  added the comment:

One way to do is to dynamically update the docstrings on import.  Something 
like this:

for name in dir(_decimal.Decimal):
if name.startswith('_'):
continue
py_method = getattr(_decimal.Decimal, name)
py_doc = py_method.__doc__
if py_doc is None:
continue
c_method = getattr(_pydecimal.Decimal, name, None)
if c_method is None:
continue
c_doc = c_method.__doc__
if c_doc is None or len(c_doc) < len(py_doc):
c_method.__doc__ = py_doc

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[issue30533] missing feature in inspect module: getmembers_static

[Dong-hee Na]

Dong-hee Na  added the comment:

Please update the documentation also.

see: 
https://docs.python.org/3.11/library/inspect.html?highlight=inspect#inspect.getmembers

--
nosy: +corona10
status: closed -> open

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[issue7951] Should str.format allow negative indexes when used for __getitem__ access?

[Eric V. Smith]

Eric V. Smith  added the comment:

I'm closing this as "won't fix" for the negative indexing functionality. If 
someone wants to open an new documentation issue (and ideally provide a PR), 
that would be welcome.

--
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stage: needs patch -> resolved
status: open -> closed

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[issue31700] one-argument version for Generator.typing

[Zeth]

Zeth  added the comment:

I don't get why this is closed. It is a bug. The Generator type annotation 
works differently than the others, it shouldn't.

Sebastian Rittau is correct here, the closer doesn't seem to have understood. 

As for using Iterator instead as the documentation suggests, that makes a 
mockery of the whole process. You might as well set everything to Any.

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[issue45876] Improve accuracy of stdev functions in statistics

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset 0aa0bd056349f73de9577ccc38560c1d01864d51 by Raymond Hettinger in 
branch 'main':
bpo-45876:  Have stdev() also use decimal specific square root. (GH-29869)
https://github.com/python/cpython/commit/0aa0bd056349f73de9577ccc38560c1d01864d51


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[issue45943] kids10yrsap...@gmail.com

[Qualyn Richard]

Change by Qualyn Richard :


--
components: email
files: PSX_20210903_080553.jpg
nosy: barry, oktaine57, r.david.murray
priority: normal
severity: normal
status: open
title: kids10yrsap...@gmail.com
type: behavior
versions: Python 3.11
Added file: https://bugs.python.org/file50463/PSX_20210903_080553.jpg

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[issue11352] Update cgi module doc

[STINNER Victor]

Change by STINNER Victor :


--
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[issue19941] python -m imports non-ASCII .py file without encoding declaration

[STINNER Victor]

STINNER Victor  added the comment:

I confirm: Python 3.10 works as expected.

Python 3.10 fails with the same SyntaxError using "python script.py" or "python 
-m script" if the script contains non-ASCII characters but is not encoded to 
UTF-8.

vstinner@apu$ python3 test.py
  File "/home/vstinner/test.py", line 1
print('�Hello world!')
 ^
SyntaxError: (unicode error) 'utf-8' codec can't decode byte 0xa1 in position 
0: invalid start byte

vstinner@apu$ python3 -m test
Traceback (most recent call last):
  (...)
  File "/home/vstinner/test.py", line 1
print('�Hello world!')
 ^
SyntaxError: (unicode error) 'utf-8' codec can't decode byte 0xa1 in position 
0: invalid start byte

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[issue11352] Update cgi module doc

[Glenn Linderman]

Glenn Linderman  added the comment:

First I would have to learn how GitHub works, and how PRs work.  And I haven't 
found time for that, as yet.

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[issue45876] Improve accuracy of stdev functions in statistics

[Raymond Hettinger]

Change by Raymond Hettinger :


--
pull_requests: +28095
pull_request: https://github.com/python/cpython/pull/29869

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[issue45476] [C API] PEP 674: Disallow using macros as l-value

[STINNER Victor]

STINNER Victor  added the comment:

Attached pep674_regex.py generated a regex to search for code incompatible with 
the PEP 674.

To download PyPI top 5000, you can use my script:
https://github.com/vstinner/misc/blob/main/cpython/download_pypi_top.py

To grep a regex in tarball and ZIP archives, you can use the rg command:

$ rg -zl REGEX DIRECTORY/*.{zip,gz,bz2,tgz}

Or you can try my script:
https://github.com/vstinner/misc/blob/main/cpython/search_pypi_top.py

--
Added file: https://bugs.python.org/file50462/pep674_regex.py

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[issue45476] [C API] PEP 674: Disallow using macros as l-value

[STINNER Victor]

STINNER Victor  added the comment:

In the PyPI top 5000 projects, I found 32 projects using "Py_SIZE(obj) =
new_size": 8 of them are written manually, 24 use Cython.

8 projects using "Py_SIZE(obj) = new_size":

* guppy3-3.1.2: src/sets/bitset.c and src/sets/nodeset.c
* mypy-0.910: list_resize() in mypyc/lib-rt/pythonsupport.h
* pickle5-0.0.12: pickle5/_pickle.c
* python-snappy-0.6.0: maybe_resize() in snappy/snappymodule.cc
* recordclass-0.16.3: lib/recordclass/_dataobject.c + code generated by Cython
* scipy-1.7.3: scipy/_lib/boost/boost/python/object/make_instance.hpp
* zodbpickle-2.2.0: src/zodbpickle/_pickle_33.c
* zstd-1.5.0.2: src/python-zstd.c

24 projects using "Py_SIZE(obj) = new_size" generated by an outdated Cython:

* Naked-0.1.31
* Shapely-1.8.0
* dedupe-hcluster-0.3.8
* fastdtw-0.3.4
* fuzzyset-0.0.19
* gluonnlp-0.10.0
* hdbscan-0.8.27
* jenkspy-0.2.0
* lightfm-1.16
* neobolt-1.7.17
* orderedset-2.0.3
* ptvsd-4.3.2
* py_spy-0.3.11
* pyemd-0.5.1
* pyhacrf-datamade-0.2.5
* pyjq-2.5.2
* pypcap-1.2.3
* python-crfsuite-0.9.7
* reedsolo-1.5.4
* tables-3.6.1
* thriftpy-0.3.9
* thriftrw-1.8.1
* tinycss-0.4
* triangle-20200424

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[issue45876] Improve accuracy of stdev functions in statistics

[Raymond Hettinger]

Raymond Hettinger  added the comment:


New changeset a39f46afdead515e7ac3722464b5ee8d7b0b2c9b by Raymond Hettinger in 
branch 'main':
bpo-45876:  Correctly rounded stdev() and pstdev() for the Decimal case 
(GH-29828)
https://github.com/python/cpython/commit/a39f46afdead515e7ac3722464b5ee8d7b0b2c9b


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[issue19941] python -m imports non-ASCII .py file without encoding declaration

[Eryk Sun]

Eryk Sun  added the comment:

test.py is a UTF-8 file, which is the default source encoding in Python 3. It 
fails as expected if the test script is encoded differently, such as Latin-1, 
unless the source encoding is declared.

--
nosy: +eryksun
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue45942] shutil.copytree can raise OSErrors not wrapped in shutil.Error

[Daisy Choi]

New submission from Daisy Choi :

shutil.copytree's docstring [1] and documentation [2] states that, "If 
exception(s) occur, an Error is raised with a list of reasons," but it can 
raise OSErrors at the top-level call. For example:

>>> import shutil
>>> shutil.copytree(nonexistent_dir, dst)
FileNotFoundError: [WinError 3] The system cannot find the path specified: '...'

>>> shutil.copytree(actually_a_file, dst)
NotADirectoryError: [WinError 267] The directory name is invalid: '...'

>>> shutil.copytree(src, dst_already_exists, dirs_exist_ok=False)
FileExistsError: [WinError 183] Cannot create a file when that file already 
exists: '...'

The errors above happen because shutil.copytree and shutil._copytree call 
os.scandir and os.makedir respectively without wrapping any exceptions inside 
shutil.Error. [3][4]


It seems like shutil.copytree(src, dst) only raises a shutil.Error if an 
OSError or shutil.Error was raised when copying over a file in src or during a 
recursive call to shutil.copytree for a subdirectory of src:

>>> shutil.copytree(dir_with_broken_symblink, dst)
shutil.Error: [('a\\symlink', 'b\\symlink', "[Errno 2] No such file or 
directory: 'asymlink'")]


Is this behavior intended? Should shutil.copytree be changed so that exceptions 
for the top level are wrapped inside shutil.Error, or should the documentation 
for shutil.copytree mention that it can raise exceptions that aren't 
shutil.Error? (Or is this just a non-issue?)


[1]: 
https://github.com/python/cpython/blob/b494f5935c92951e75597bfe1c8b1f3112fec270/Lib/shutil.py#L522
[2]: 
https://docs.python.org/3.10/library/shutil.html?highlight=shutil#shutil.copytree
[3]: 
https://github.com/python/cpython/blob/b494f5935c92951e75597bfe1c8b1f3112fec270/Lib/shutil.py#L554
[4]: 
https://github.com/python/cpython/blob/b494f5935c92951e75597bfe1c8b1f3112fec270/Lib/shutil.py#L457

--
components: Library (Lib)
messages: 407413
nosy: Floozutter
priority: normal
severity: normal
status: open
title: shutil.copytree can raise OSErrors not wrapped in shutil.Error
type: behavior
versions: Python 3.10

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[issue45476] [C API] PEP 674: Disallow using macros as l-value

[STINNER Victor]

STINNER Victor  added the comment:

I found 4 projects using "Py_TYPE(obj) = new_type;" in the PyPI top 5000:

mypy-0.910:

* mypyc/lib-rt/misc_ops.c: Py_TYPE(template_) = _Type;
* mypyc/lib-rt/misc_ops.c: Py_TYPE(t) = metaclass;

recordclass-0.16.3:

* lib/recordclass/_dataobject.c: Py_TYPE(op) = type;
* lib/recordclass/_dataobject.c: Py_TYPE(op) = type;
* lib/recordclass/_litetuple.c: // Py_TYPE(ob) = _Type;

pysha3-1.0.2:

* Modules/_sha3/sha3module.c: Py_TYPE(type) = _Type;

datatable-1.0.0.tar.gz:

* src/core/python/namedtuple.cc: Py_TYPE(v) = type.v;
* src/core/python/tuple.cc: Py_TYPE(v_new) = v_type;

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[issue22942] Language Reference - optional comma

[Irit Katriel]

Change by Irit Katriel :


--
resolution:  -> out of date
stage: needs patch -> resolved
status: open -> closed

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[issue33252] [doc] Clarify ResourceWarning documentation

[Irit Katriel]

Irit Katriel  added the comment:

It's too late for (b) but (a) still needs to be done.

--
keywords: +easy
nosy: +iritkatriel
title: Clarify ResourceWarning documentation -> [doc] Clarify ResourceWarning 
documentation
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 3.4, Python 3.5, Python 
3.6, Python 3.7, Python 3.8

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[issue45476] [C API] PEP 674: Disallow using macros as l-value

[STINNER Victor]

STINNER Victor  added the comment:

In the PyPI top 5000, I found two projects using PyDescr_TYPE() and 
PyDescr_NAME() as l-value: M2Crypto and mecab-python3. In both cases, it was 
code generated by SWIG:

 * This file was automatically generated by SWIG (http://www.swig.org).
 * Version 4.0.2

M2Crypto-0.38.0/src/SWIG/_m2crypto_wrap.c and 
mecab-python3-1.0.4/src/MeCab/MeCab_wrap.cpp contain the function:

SWIGINTERN PyGetSetDescrObject *
SwigPyStaticVar_new_getset(PyTypeObject *type, PyGetSetDef *getset) {

  PyGetSetDescrObject *descr;
  descr = (PyGetSetDescrObject *)PyType_GenericAlloc(SwigPyStaticVar_Type(), 0);
  assert(descr);
  Py_XINCREF(type);
  PyDescr_TYPE(descr) = type;
  PyDescr_NAME(descr) = PyString_InternFromString(getset->name);
  descr->d_getset = getset;
  if (PyDescr_NAME(descr) == NULL) {
Py_DECREF(descr);
descr = NULL;
  }
  return descr;
}

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[issue31042] Inconsistency in documentation of operator.index

[Irit Katriel]

Irit Katriel  added the comment:

My reading of the discussion is that we are not going to make any changes to 
the docs. Please correct me if I missed anything.

--
nosy: +iritkatriel
resolution:  -> rejected
status: open -> pending

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[issue45476] [C API] PEP 674: Disallow using macros as l-value

[STINNER Victor]

Change by STINNER Victor :


--
title: [C API] Disallow using PyFloat_AS_DOUBLE() as l-value -> [C API] PEP 
674: Disallow using macros as l-value

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[issue16652] [doc] socket.getfqdn docs are not explicit enough about the algorithm.

[Irit Katriel]

Irit Katriel  added the comment:

There was a recent update nearby in issue40635 by Andrei, but I think it 
doesn't quite cover this issue.

--
nosy: +andrei.avk, iritkatriel
title: socket.getfqdn docs are not explicit enough about the algorithm. -> 
[doc] socket.getfqdn docs are not explicit enough about the algorithm.
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 2.7, Python 3.4, Python 
3.5

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[issue45941] help("modules") segfaults on 3.11, MacOS

[Irit Katriel]

Irit Katriel  added the comment:

It's failing in this assertion which was added in 
https://github.com/python/cpython/pull/28802 :

https://github.com/python/cpython/blob/8a45ca542a65ea27e7acaa44a4c833a27830e796/Objects/object.c#L1305

--
nosy: +Mark.Shannon

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[issue45340] Lazily create dictionaries for plain Python objects

[Irit Katriel]

Irit Katriel  added the comment:

I believe this may have caused the regression in Issue45941.

--
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[issue30533] missing feature in inspect module: getmembers_static

[Dino Viehland]

Change by Dino Viehland :


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

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[issue45941] help("modules") segfaults on 3.11, MacOS

[Irit Katriel]

Irit Katriel  added the comment:

It works for me on 3.10.

--
keywords: +3.11regression

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[issue45941] help("modules") segfaults on 3.11, MacOS

[Irit Katriel]

Change by Irit Katriel :


--
title: help("modules") segfaults on 3.11 -> help("modules") segfaults on 3.11, 
MacOS

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[issue45941] help("modules") segfaults on 3.11

[Irit Katriel]

Irit Katriel  added the comment:

On the debugger: 

>>> help("modules")

Please wait a moment while I gather a list of all available modules...

/Users/iritkatriel/src/cpython/Lib/pkgutil.py:92: DeprecationWarning: The 
distutils package is deprecated and slated for removal in Python 3.12. Use 
setuptools or check PEP 632 for potential alternatives
  __import__(info.name)
/Users/iritkatriel/src/cpython/Lib/pkgutil.py:92: DeprecationWarning: lib2to3 
package is deprecated and may not be able to parse Python 3.10+
  __import__(info.name)
test_sqlite3: testing with version '2.6.0', sqlite_version '3.32.3'
/Users/iritkatriel/src/cpython/Lib/distutils/command/build_ext.py:13: 
DeprecationWarning: The distutils.sysconfig module is deprecated, use sysconfig 
instead
  from distutils.sysconfig import customize_compiler, get_python_version
Process 88596 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS 
(code=1, address=0x0)
frame #0: 0x000100160046 
python.exe`_PyObject_GenericGetAttrWithDict(obj=0x000106acfa50, 
name=0x000100fe91c0, dict=0x, suppress=0) at 
object.c:1305:17
   1302 PyDictValues **values_ptr = _PyObject_ValuesPointer(obj);
   1303 if (values_ptr && *values_ptr) {
   1304 if (PyUnicode_CheckExact(name)) {
-> 1305 assert(*_PyObject_DictPointer(obj) == NULL);
   1306 res = _PyObject_GetInstanceAttribute(obj, *values_ptr, 
name);
   1307 if (res != NULL) {
   1308 goto done;
Target 0: (python.exe) stopped.
(lldb) p _PyObject_Dump(name)
object address  : 0x100fe91c0
object refcount : 165
object type : 0x10051aec0
object type name: str
object repr : 'string'
(lldb) p _PyObject_Dump(*_PyObject_DictPointer(obj))
error: Execution was interrupted, reason: Attempted to dereference an invalid 
pointer..
The process has been returned to the state before expression evaluation.
(lldb) p _PyObject_Dump(obj)
object address  : 0x106acfa50
object refcount : 7
object type : 0x105add590
object type name: _cffi_backend.FFI
object repr : <_cffi_backend.FFI object at 0x106acfa50>

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[issue45941] help("modules") segfaults on 3.11

[Irit Katriel]

New submission from Irit Katriel :

Python 3.11.0a2+ (heads/main:8a45ca542a, Nov 30 2021, 22:40:56) [Clang 13.0.0 
(clang-1300.0.29.3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> help("modules")

Please wait a moment while I gather a list of all available modules...

/Users/iritkatriel/src/cpython/Lib/pkgutil.py:92: DeprecationWarning: The 
distutils package is deprecated and slated for removal in Python 3.12. Use 
setuptools or check PEP 632 for potential alternatives
  __import__(info.name)
/Users/iritkatriel/src/cpython/Lib/pkgutil.py:92: DeprecationWarning: lib2to3 
package is deprecated and may not be able to parse Python 3.10+
  __import__(info.name)
test_sqlite3: testing with version '2.6.0', sqlite_version '3.32.3'
/Users/iritkatriel/src/cpython/Lib/distutils/command/build_ext.py:13: 
DeprecationWarning: The distutils.sysconfig module is deprecated, use sysconfig 
instead
  from distutils.sysconfig import customize_compiler, get_python_version
zsh: segmentation fault  ./python.exe

--
components: Interpreter Core
messages: 407403
nosy: iritkatriel
priority: normal
severity: normal
status: open
title: help("modules") segfaults on 3.11
type: crash
versions: Python 3.11

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[issue45711] Simplify the interpreter's (type, val, tb) exception representation

[Irit Katriel]

Irit Katriel  added the comment:


New changeset 8a45ca542a65ea27e7acaa44a4c833a27830e796 by Irit Katriel in 
branch 'main':
bpo-45711: Change exc_info related APIs to derive type and traceback from the 
exception instance (GH-29780)
https://github.com/python/cpython/commit/8a45ca542a65ea27e7acaa44a4c833a27830e796


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[issue45933] Illegal Instrution (Core Dumped)

[Tom E]

Tom E  added the comment:

Not yet... my configure flags are ./configure CFLAGS="-O3 -mtune=corei7-avx 
-march=corei7-avx" LDFLAGS="-L/usr/local/ssl/lib64" CPP=cpp CXX=g++ 
--with-openssl=/usr/local/ssl --enable-optimizations --enable-shared

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[issue25633] The documentation for urllib.request should mention http.client.HTTPException

[Irit Katriel]

Irit Katriel  added the comment:

Issue22797 was resolved by being more specific about when a URLError is raised, 
rather than mentioning other exceptions as well. Do we want to do more than 
that, or can this be closed as well?

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status: open -> pending

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[issue6471] errno and strerror attributes incorrectly set on socket errors wrapped by urllib

[Irit Katriel]

Irit Katriel  added the comment:

Reproduced on 3.11:

>>> from urllib.request import urlopen
>>> try:
... urlopen('http://www.pythonfoobarbaz.org')
... except Exception as exc:
... err = exc
... print('err:', err)
... print('repr(err):', repr(err))
... print('err.errno:', err.errno)
... print('err.strerror:', err.strerror)
... print('err.reason:', err.reason)
... print('err.reason.errno:', err.reason.errno)
... print('err.reason.strerror:', err.reason.strerror)
... 
err: 
repr(err): URLError(gaierror(8, 'nodename nor servname provided, or not known'))
err.errno: None
err.strerror: None
err.reason: [Errno 8] nodename nor servname provided, or not known
err.reason.errno: 8
err.reason.strerror: nodename nor servname provided, or not known

--
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versions: +Python 3.10, Python 3.11, Python 3.9 -Python 2.6, Python 2.7, Python 
3.1, Python 3.2

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[issue11352] Update cgi module doc

[Irit Katriel]

Irit Katriel  added the comment:

Would you like to work on a GitHub PR with these changes?

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[issue11352] Update cgi module doc

[Glenn Linderman]

Glenn Linderman  added the comment:

Seems like another example of the CGI module not getting much support. While I 
haven't looked at all the details of the patches, it seems that several people 
have contributed enhancements or clarifications. and it would be a shame to 
discard them rather than merge the submissions... but it seems no one with 
authority wants to support CGI.

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Re: Python child process in while True loop blocks parent

[Barry Scott]

> On 29 Nov 2021, at 22:31, Jen Kris  wrote:
> 
> Thanks to you and Cameron for your replies.  The C side has an epoll_ctl set, 
> but no event loop to handle it yet.  I'm putting that in now with a pipe 
> write in Python-- as Cameron pointed out that is the likely source of 
> blocking on C.  The pipes are opened as rdwr in Python because that's 
> nonblocking by default.  The child will become more complex, but not in a way 
> that affects polling.  And thanks for the tip about the c-string termination. 
> 

flags is a bit mask. You say its BLOCKing by not setting os.O_NONBLOCK.
You should not use O_RDWR when you only need O_RDONLY access or only O_WRONLY 
access.

You may find

man 2 open

useful to understand in detail what is behind os.open().

Barry



> 
> 
> Nov 29, 2021, 14:12 by ba...@barrys-emacs.org:
> 
> On 29 Nov 2021, at 20:36, Jen Kris via Python-list  
> wrote:
> 
> I have a C program that forks to create a child process and uses execv to 
> call a Python program. The Python program communicates with the parent 
> process (in C) through a FIFO pipe monitored with epoll(). 
> 
> The Python child process is in a while True loop, which is intended to keep 
> it running while the parent process proceeds, and perform functions for the C 
> program only at intervals when the parent sends data to the child -- similar 
> to a daemon process. 
> 
> The C process writes to its end of the pipe and the child process reads it, 
> but then the child process continues to loop, thereby blocking the parent. 
> 
> This is the Python code:
> 
> #!/usr/bin/python3
> import os
> import select
> 
> #Open the named pipes
> pr = os.open('/tmp/Pipe_01', os.O_RDWR)
> Why open rdwr if you are only going to read the pipe?
> pw = os.open('/tmp/Pipe_02', os.O_RDWR)
> Only need to open for write.
> 
> ep = select.epoll(-1)
> ep.register(pr, select.EPOLLIN)
> 
> Is the only thing that the child does this:
> 1. Read message from pr
> 2. Process message
> 3. Write result to pw.
> 4. Loop from 1
> 
> If so as Cameron said you do not need to worry about the poll.
> Do you plan for the child to become more complex?
> 
> while True:
> 
> events = ep.poll(timeout=2.5, maxevents=-1)
> #events = ep.poll(timeout=None, maxevents=-1)
> 
> print("child is looping")
> 
> for fileno, event in events:
> print("Python fileno")
> print(fileno)
> print("Python event")
> print(event)
> v = os.read(pr,64)
> print("Pipe value")
> print(v)
> 
> The child process correctly receives the signal from ep.poll and correctly 
> reads the data in the pipe, but then it continues looping. For example, when 
> I put in a timeout:
> 
> child is looping
> Python fileno
> 4
> Python event
> 1
> Pipe value
> b'10\x00'
> The C code does not need to write a 0 bytes at the end.
> I assume the 0 is from the end of a C string.
> UDS messages have a length.
> In the C just write 2 byes in the case.
> 
> Barry
> child is looping
> child is looping
> 
> That suggests that a while True loop is not the right thing to do in this 
> case. My question is, what type of process loop is best for this situation? 
> The multiprocessing, asyncio and subprocess libraries are very extensive, and 
> it would help if someone could suggest the best alternative for what I am 
> doing here. 
> 
> Thanks very much for any ideas. 
> 
> 
> -- 
> https://mail.python.org/mailman/listinfo/python-list
> 

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[issue27779] Sync-up docstrings in C version of the the decimal module

[Irit Katriel]

Change by Irit Katriel :


--
assignee: skrah -> 
keywords: +easy -patch
type:  -> enhancement
versions: +Python 3.11 -Python 3.5, Python 3.6

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[issue20468] [doc] resource module documentation is incorrect

[Irit Katriel]

Irit Katriel  added the comment:

The remaining text is now saying "Returns the number of bytes in a system 
page". This is still not accurate if it's sometimes number of kilobytes.

--
nosy: +iritkatriel
title: resource module documentation is incorrect -> [doc] resource module 
documentation is incorrect
type:  -> behavior
versions: +Python 3.10, Python 3.11, Python 3.9 -Python 2.7, Python 3.4, Python 
3.5, Python 3.6

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[issue45476] [C API] Disallow using PyFloat_AS_DOUBLE() as l-value

[STINNER Victor]

STINNER Victor  added the comment:

I wrote PEP 674 "Disallow using macros as l-value" for this change: 
https://python.github.io/peps/pep-0674/

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[issue11352] Update cgi module doc

[Irit Katriel]

Irit Katriel  added the comment:

Since there was no activity on this for 6-7 years and it's not describing a 
specific issue, I will close this in a couple of weeks unless someone asks me 
not to.

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[issue30533] missing feature in inspect module: getmembers_static

[Dino Viehland]

Dino Viehland  added the comment:


New changeset af8c8caaf5e07c02202d736a31f6a2f7e27819b8 by Weipeng Hong in 
branch 'main':
bpo-30533:Add function inspect.getmembers_static that does not call properties 
or dynamic properties. (#20911)
https://github.com/python/cpython/commit/af8c8caaf5e07c02202d736a31f6a2f7e27819b8


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[issue24124] Two versions of instructions for installing Python modules

[Irit Katriel]

Irit Katriel  added the comment:

The legacy doc has this message in it now, so I think we can close this issue 
and trust Steve to deal with it along with the rest of distutils.


   The entire ``distutils`` package has been deprecated and will be
   removed in Python 3.12. This documentation is retained as a
   reference only, and will be removed with the package. See the
   :ref:`What's New ` entry for more information.

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

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[issue45940] add_multiarch_paths breaks cross compilation to Emscripten

[Ethan Smith]

Ethan Smith  added the comment:

Unfortunately, I am using latest master :/

I was able to reproduce this issue in your wasm docker container mounting 
CPython master into it, if you want to play with this.

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[issue45940] add_multiarch_paths breaks cross compilation to Emscripten

[Christian Heimes]

Christian Heimes  added the comment:

rm config.cache?

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[issue45940] add_multiarch_paths breaks cross compilation to Emscripten

[Ethan Smith]

Ethan Smith  added the comment:

Bah, it actually seems the real issue is that my configure is choosing the 
host_cpu as x86-64 for some reason. I'm still trying to figure out why though.

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[issue45940] add_multiarch_paths breaks cross compilation to Emscripten

[Christian Heimes]

Christian Heimes  added the comment:

Could you please try again with latest master? GH-29752 should have fixed the 
issue.

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[issue45940] add_multiarch_paths breaks cross compilation to Emscripten

[Ethan Smith]

Change by Ethan Smith :


--
keywords: +patch
pull_requests: +28094
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/29868

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[issue45940] add_multiarch_paths breaks cross compilation to Emscripten

[Ethan Smith]

New submission from Ethan Smith :

When I cross compile on an Ubuntu system, the "PyBuildExt.add_multiarch_paths" 
method seems to add system includes, even when cross compiling for Emscripten.

Adding the system includes breaks Emscripten and causes several extensions to 
fail to build.

I have a patch which fixes this that I will be submitting shortly to Github.

--
components: Build
messages: 407387
nosy: christian.heimes, ethan smith
priority: normal
severity: normal
status: open
title: add_multiarch_paths breaks cross compilation to Emscripten
type: compile error
versions: Python 3.11

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[issue19941] python -m imports non-ASCII .py file without encoding declaration

[Irit Katriel]

Change by Irit Katriel :


--
components: +Interpreter Core

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[issue19941] python -m imports non-ASCII .py file without encoding declaration

[Irit Katriel]

Irit Katriel  added the comment:

On 3.11 both are working (on a Mac):

cpython-1 % python -m tt  
¡Hello world!
cpython-1 % ./python.exe -c 'import tt'
¡Hello world!

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[issue17186] no way to introspect registered atexit handlers

[Irit Katriel]

Change by Irit Katriel :


--
components: +Library (Lib)
type:  -> enhancement
versions: +Python 3.11 -Python 3.4

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[issue28842] PyInstanceMethod_Type isn't hashable

[Irit Katriel]

Change by Irit Katriel :


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[issue28842] PyInstanceMethod_Type isn't hashable

[Irit Katriel]

Change by Irit Katriel :


--
type: behavior -> enhancement
versions: +Python 3.11 -Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 
3.7

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[issue24725] test_socket testFDPassEmpty fails on OS X 10.11+ with "Cannot allocate memory"

[Ronald Oussoren]

Ronald Oussoren  added the comment:

The reproducer script and .c file I added earlier do not fail with "Cannot 
allocate memory" on macOS 12.0.1.

I haven't checked yet if this is enough to avoid test failures in the (now 
skipped) testFDPassEmpty.

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[issue45816] Python does not support standalone MSVC v143 (VS 2022) Build Tools

[Kumar Aditya]

Kumar Aditya  added the comment:

Thanks Steve, installing v142 is indeed my current workaround but would be
great to support v143 as it is the latest version.

On Tue, Nov 30, 2021, 21:09 Steve Dower  wrote:

>
> Steve Dower  added the comment:
>
> An easy workaround for people encountering this is to set the
> PlatformToolset environment variable to v143 before building:
>
> $env:PlatformToolset = "v143"
>
> (or in CMD: set PlatformToolset=v143)
>
> Alternatively, you should be able to install the v142 toolset through VS
> 2022. For now, it's still the official toolset, though we'll definitely
> move to v143 before 3.11.
>
> --
>
> ___
> Python tracker 
> 
> ___
>

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[issue45939] PyErr_SetObject documentation lacks mention of reference counting

[Ronald Oussoren]

Ronald Oussoren  added the comment:

The default behaviour of functions is to not steal references, in general only 
exceptions to this are documented. Likewise with return values: by default the 
result is a strong reference, and borrowed references are documented as such.

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[issue45816] Python does not support standalone MSVC v143 (VS 2022) Build Tools

[Steve Dower]

Steve Dower  added the comment:

An easy workaround for people encountering this is to set the PlatformToolset 
environment variable to v143 before building:

$env:PlatformToolset = "v143"

(or in CMD: set PlatformToolset=v143)

Alternatively, you should be able to install the v142 toolset through VS 2022. 
For now, it's still the official toolset, though we'll definitely move to v143 
before 3.11.

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[issue45939] PyErr_SetObject documentation lacks mention of reference counting

[Eric Blake]

New submission from Eric Blake :

While PyErr_SetString is obvious that you do not have to worry about the 
reference count of 'exception', the documentation for PyErr_SetObject is silent 
on whether it steals or adds a reference to 'value'.  This is particularly 
confusing, since other functions on the page (like PyErr_Restore) are explicit 
about stealing references.  Looking at non-canonical documentation, I found 
https://docstore.mik.ua/orelly/other/python/0596001886_pythonian-chp-24-sect-1.html
 which claims PyErr_SetObject steals a reference to 'value'.  But that is 
wrong; looking at the source code for _PyErr_SetString, it becomes obvious that 
once you use SetObject, the reference count will be increased, and the caller 
can release its own reference because nothing was stolen.

I noticed this lack of documentation when trying to debug a memory leak in 
nbdsh: 
https://listman.redhat.com/archives/libguestfs/2021-November/msg00280.html

--
assignee: docs@python
components: Documentation
messages: 407381
nosy: docs@python, eblake
priority: normal
severity: normal
status: open
title: PyErr_SetObject documentation lacks mention of reference counting

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[issue45917] Add math.exp2() function: 2^x

[Mark Dickinson]

Mark Dickinson  added the comment:

[Tim]

> on Windows, exp2(x) is way worse then pow(2, x)

Darn.

> I expect we should just live with it.

Agreed.

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[issue44637] Quoting issue on header Reply-To and other address headers

[STINNER Victor]

Change by STINNER Victor :


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[issue45938] EmailMessage as_bytes

[Marc Villain]

New submission from Marc Villain :

I am parsing an email with a subject header where the encoding of a unicode 
character happens to be cut in half. When a second encoded unicode character is 
encountered, we get the following error:

> 'utf-8' codec can't encode characters in position 1-2: surrogates not allowed

This error can be reproduced using the following:
>>> from email.message import EmailMessage
>>> msg = EmailMessage()
>>> msg.add_header('subject', '=?UTF-8?Q?a=C3?= =?UTF-8?Q?=B1o_a=C3=B1o?=')
>>> print(str(msg)) # This will succeed
>>> print(msg.as_bytes())   # This will fail
>>> print(msg.as_string())  # This will fail

After a bit of investigations, it appears the library is at some poing trying 
to concatenate 'a\udcc3\udcb1o ' and 'cómo'. It then proceeds to try to call 
_ew.encode in email._header_value_parser._fold_as_ew on that. This obviously 
fails as '\udcc3\udcb1o' is not utf-8, whereas 'cómo' is.

More tests:
[OK] '=?UTF-8?Q?a=C3?= =?UTF-8?Q?=B1o_a=C3=B1o?='
 > b' subject: =?utf-8?q?a=C3=B1o_c=C3=B3mo?=\n\n'
[OK] '=?UTF-8?Q?a=C3?= =?UTF-8?Q?=B1o_cmo?='
 > b' subject: =?unknown-8bit?q?a=C3=B1o?= cmo\n\n'
[OK] '=?UTF-8?Q?a=C3?= =?UTF-8?Q?=B1o?= =?UTF-8?Q?a=C3?= =?UTF-8?Q?=B1o?='
 > b' subject: =?unknown-8bit?q?a=C3=B1oa=C3=B1o?=\n\n'
[KO] '=?UTF-8?Q?a=C3?= =?UTF-8?Q?=B1o_a=C3=B1o?='
 > 'utf-8' codec can't encode characters in position 1-2: surrogates not 
allowed

Not sure what is the best way to fix that.

--
components: Library (Lib)
messages: 407379
nosy: marc.villain
priority: normal
severity: normal
status: open
title: EmailMessage as_bytes
type: crash
versions: Python 3.10

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[issue45732] Make python.org Windows and macOS installers use Tk 8.6.12

[Ned Deily]

Ned Deily  added the comment:

> It would be really great if Python 3.10.1 for macOS would come with Tcl/Tk 
> 8.6.12, as it is supposed to fix a nasty crash with Spanish keyboard.

Not to worry, the Tk for the macOS 3.10.1 will be updated. I need to do some 
more testing first. (BTW, I assume you are referring to this Tk issue: 
https://core.tcl-lang.org/tk/tktview/1626ed65b879bd76db99. The most recent 
3.11.0 alpha preview has a pre-release of 8.6.12 and I can confirm that the 
Cmd-` with the Spanish keyboard no longer crashes with it.)

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[issue44637] Quoting issue on header Reply-To and other address headers

[R. David Murray]

Change by R. David Murray :


--
nosy: +thehesiod
title: Quoting issue on header Reply-To -> Quoting issue on header Reply-To and 
other address headers

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[issue45932] EmailMessage incorrectly splits name and address header

[R. David Murray]

R. David Murray  added the comment:

This is a duplicate of #44637.

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed

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[issue44674] dataclasses should allow frozendict default value

[Eric V. Smith]

Change by Eric V. Smith :


--
keywords: +patch
pull_requests: +28093
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/29867

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[issue43153] tempfile seems to treat a file as a directory when processing an exception in the onerror()

[Andrei Kulakov]

Andrei Kulakov  added the comment:

My last comment was wrong, the issue I linked is unrelated.

I think the actual issue here is the code here:
https://github.com/python/cpython/blob/4b97d974ecca9cce532be55410fe851eb9fdcf21/Lib/tempfile.py#L826

If `path` is a file that causes a permission error, `rmtree` is called and 
causes a NotADirectory error.

This can be confusing when debugging and can lead to a bug if user's code tries 
to catch a PermissionError it expects but instead gets NotADirectory error.

A solution is probably to check if path is a file and error is PermissionError 
and if ignore_errors=False, re-raise it instead of calling rmtree(). If 
ignore_errors=True, return instead of calling rmtree().

I don't have windows so can't test the OP code with this approach.

Serhiy: adding you since you wrote `def onerror()` in tempfile module, do you 
think that is the cause of the issue and the right solution for it?

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[issue45476] [C API] Disallow using PyFloat_AS_DOUBLE() as l-value

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 4b97d974ecca9cce532be55410fe851eb9fdcf21 by Victor Stinner in 
branch 'main':
bpo-45476: Disallow using asdl_seq_GET() as l-value (GH-29866)
https://github.com/python/cpython/commit/4b97d974ecca9cce532be55410fe851eb9fdcf21


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[issue45476] [C API] Disallow using PyFloat_AS_DOUBLE() as l-value

[STINNER Victor]

STINNER Victor  added the comment:

I created this issue to disallow macros like PyFloat_AS_DOUBLE() and 
PyDict_GET_SIZE() as l-value. It seems like this change by itself is 
controversial.

I proposed one way to implement this change: convert macros to static inline 
functions. I didn't expect that this conversion would be also controversial. 
For now, I abandon the static inline approach, to focus on the implementation 
which keeps macros: modify macros to use _Py_RVALUE() => PR 28976.

Once the PR 28976 will be merged and the PEP 670 will be accepted, we can 
reconsider converting these macros to static inline functions, then it should 
be non controversial.

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[issue37658] In some cases asyncio.wait_for can lead to socket leak.

[Andrew Svetlov]

Andrew Svetlov  added the comment:


New changeset 99a9b343316172f049a52b39a406f0c0c42c106f by Miss Islington (bot) 
in branch '3.9':
bpo-37658: Actually return result in race condition (GH-29202) (GH-29832)
https://github.com/python/cpython/commit/99a9b343316172f049a52b39a406f0c0c42c106f


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[issue41270] NamedTemporaryFile is not its own iterator.

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Biopython uses next() without iter(), and there is no guarantee that it should 
work.

--
nosy: +brett.cannon, pitrou, serhiy.storchaka

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[issue45476] [C API] Disallow using PyFloat_AS_DOUBLE() as l-value

[STINNER Victor]

Change by STINNER Victor :


--
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pull_request: https://github.com/python/cpython/pull/29866

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[issue44884] logging Formatter behavior when using msecs and braces : '{'

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue41270] NamedTemporaryFile is not its own iterator.

[Irit Katriel]

Change by Irit Katriel :


--
type: behavior -> enhancement
versions: +Python 3.11 -Python 3.10, Python 3.5, Python 3.6, Python 3.7, Python 
3.8, Python 3.9

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[issue26791] shutil.move fails to move symlink (Invalid cross-device link)

[Irit Katriel]

Irit Katriel  added the comment:

Removing old versions.

--
nosy: +iritkatriel
versions: +Python 3.11 -Python 2.7, Python 3.5, Python 3.6, Python 3.7, Python 
3.8

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[issue45916] documentation link error

[Tony Zhou]

Tony Zhou  added the comment:

ok i see, I found the pdf. thank you for that anyway

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[issue31196] Blank line inconsistency between InteractiveConsole and standard interpreter

[Irit Katriel]

Irit Katriel  added the comment:

I'm pretty sure both behaviours are by design.  Can you explain why this is a 
problem?

--
nosy: +iritkatriel
resolution:  -> not a bug
status: open -> pending

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[issue29964] [doc] %z directive has no effect on the output of time.strptime

[Irit Katriel]

Irit Katriel  added the comment:

See also Issue20281.

--
assignee:  -> docs@python
components: +Documentation -Library (Lib)
nosy: +docs@python, iritkatriel
title: %z directive has no effect on the output of time.strptime -> [doc] %z 
directive has no effect on the output of time.strptime
type: behavior -> enhancement
versions: +Python 3.11 -Python 3.5

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[issue20281] [doc] time.strftime %z format specifier is the same as %Z

[Irit Katriel]

Irit Katriel  added the comment:

See also Issue29964.

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[issue13236] unittest needs more flush calls

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

I do not remember details, but I encountered this issue (maybe when run tests 
in subprocesses?).

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[issue13236] unittest needs more flush calls

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
versions: +Python 3.10, Python 3.9

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[issue13236] unittest needs more flush calls

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
keywords: +patch
nosy: +serhiy.storchaka
nosy_count: 7.0 -> 8.0
pull_requests: +28091
stage: test needed -> patch review
pull_request: https://github.com/python/cpython/pull/29864

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[issue45607] Make it possible to enrich an exception's error message

[Irit Katriel]

Irit Katriel  added the comment:

Issue28953 is another use case for this feature.

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[issue33381] [doc] Incorrect documentation for strftime()/strptime() format code %f

[Irit Katriel]

Irit Katriel  added the comment:

Thank you Judy and Vishal!

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

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[issue33381] [doc] Incorrect documentation for strftime()/strptime() format code %f

[Irit Katriel]

Irit Katriel  added the comment:


New changeset 031e2bb3326be542b224bbe35e7829846ea422cd by Miss Islington (bot) 
in branch '3.9':
bpo-33381: [doc] strftime's %f option may pad zeros on the left or the right 
(GH-29801) (GH-29863)
https://github.com/python/cpython/commit/031e2bb3326be542b224bbe35e7829846ea422cd


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[issue33381] [doc] Incorrect documentation for strftime()/strptime() format code %f

[Irit Katriel]

Irit Katriel  added the comment:


New changeset 39751420b363530ef46506f10691d7b91ffe9b44 by Miss Islington (bot) 
in branch '3.10':
bpo-33381: [doc] strftime's %f option may pad zeros on the left or the right 
(GH-29801) (GH-29862)
https://github.com/python/cpython/commit/39751420b363530ef46506f10691d7b91ffe9b44


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[issue34820] binascii.c:1578:1: error: the control flow of function ‘binascii_crc32’ does not match its profile data (counter ‘arcs’)

[Christian Heimes]

Christian Heimes  added the comment:

Thanks for the update.

I'm marking the issue as "wont fix" for 3.7 and 3.8.

--
nosy: +christian.heimes
resolution:  -> wont fix
stage: needs patch -> resolved
status: open -> closed
superseder:  -> "make clean" should remove PGO task data

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[issue45732] Make python.org Windows and macOS installers use Tk 8.6.12

[Aivar Annamaa]

Aivar Annamaa  added the comment:

Do I understand properly, that the macOS build hasn't been updated yet?

It would be really great if Python 3.10.1 for macOS would come with Tcl/Tk 
8.6.12, as it is supposed to fix a nasty crash with Spanish keyboard.

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[issue45933] Illegal Instrution (Core Dumped)

[Christian Heimes]

Christian Heimes  added the comment:

The issue sounds like a bug in your Linux distribution. I have been using GCC 
11.2 for a while without any problems. Have you filed a bug with Ubuntu already?

--
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[issue45476] [C API] Disallow using PyFloat_AS_DOUBLE() as l-value

[STINNER Victor]

STINNER Victor  added the comment:


New changeset c19c3a09618ac400538ee412f84be4c1196c7bab by Victor Stinner in 
branch 'main':
bpo-45476: Add _Py_RVALUE() macro (GH-29860)
https://github.com/python/cpython/commit/c19c3a09618ac400538ee412f84be4c1196c7bab


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[issue33381] [doc] Incorrect documentation for strftime()/strptime() format code %f

[miss-islington]

Change by miss-islington :


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pull_requests: +28090
pull_request: https://github.com/python/cpython/pull/29863

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[issue33381] [doc] Incorrect documentation for strftime()/strptime() format code %f

[Irit Katriel]

Irit Katriel  added the comment:


New changeset f97ec09baf8431494fd2ef5133090c7b0afd0551 by Vishal Pandey in 
branch 'main':
bpo-33381: [doc] strftime's %f option may pad zeros on the left or the right 
(GH-29801)
https://github.com/python/cpython/commit/f97ec09baf8431494fd2ef5133090c7b0afd0551


--
nosy: +iritkatriel

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