[issue35608] python3 multiprocessing queue deadlock when use thread and process at same time

[beruhan]

beruhan  added the comment:

debug message as follows:
[DEBUG/MainProcess] created semlock with handle 140059486064640
[DEBUG/MainProcess] created semlock with handle 140059486060544
[DEBUG/MainProcess] created semlock with handle 140059486056448
[DEBUG/MainProcess] Queue._after_fork()
[DEBUG/MainProcess] created semlock with handle 140059486052352
[DEBUG/MainProcess] created semlock with handle 140059486048256
[DEBUG/MainProcess] created semlock with handle 140059486044160
[DEBUG/MainProcess] Queue._after_fork()
[DEBUG/MainProcess] Queue._start_thread()
[DEBUG/MainProcess] doing self._thread.start()
[DEBUG/MainProcess] starting thread to feed data to pipe
[DEBUG/MainProcess] ... done self._thread.start()
^CTraceback (most recent call last):
  File "main_simple.py", line 76, in 
proc.join()
  File "/usr/lib/python3.6/multiprocessing/process.py", line 124, in join
res = self._popen.wait(timeout)
  File "/usr/lib/python3.6/multiprocessing/popen_fork.py", line 50, in wait
return self.poll(os.WNOHANG if timeout == 0.0 else 0)
  File "/usr/lib/python3.6/multiprocessing/popen_fork.py", line 28, in poll
pid, sts = os.waitpid(self.pid, flag)
KeyboardInterrupt
^CException ignored in: 
Traceback (most recent call last):
  File "/usr/lib/python3.6/threading.py", line 1294, in _shutdown
t.join()
  File "/usr/lib/python3.6/threading.py", line 1056, in join
self._wait_for_tstate_lock()
  File "/usr/lib/python3.6/threading.py", line 1072, in _wait_for_tstate_lock
elif lock.acquire(block, timeout):
KeyboardInterrupt
[INFO/MainProcess] process shutting down
[DEBUG/MainProcess] running all "atexit" finalizers with priority >= 0
[DEBUG/MainProcess] telling queue thread to quit
[INFO/MainProcess] calling join() for process Process-3
^CError in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python3.6/multiprocessing/popen_fork.py", line 28, in poll
pid, sts = os.waitpid(self.pid, flag)

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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:


New changeset 78de01198b047347abc5e458851bb12c48429e24 by Serhiy Storchaka 
(Xtreak) in branch 'master':
bpo-35603: Escape table header of make_table output that can cause potential 
XSS. (GH-11341)
https://github.com/python/cpython/commit/78de01198b047347abc5e458851bb12c48429e24


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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[miss-islington]

Change by miss-islington :


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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[miss-islington]

Change by miss-islington :


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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[miss-islington]

Change by miss-islington :


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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[miss-islington]

Change by miss-islington :


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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Is 2.7 affected?

This looks like potentially security issue, so it may be worth to backport the 
fix to 3.6 and 3.5.

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type: behavior -> security
versions: +Python 3.5, Python 3.6

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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

Yes, 2.7 is also affected at 
https://github.com/python/cpython/blob/befe3f7afdc5279b320af88a9e57f682c0172599/Lib/difflib.py#L2001
 . I think it was missed during the initial addition in issue914575 and no one 
would be using it as a feature to have custom HTML directly injected in table 
header using fromdesc and todesc. So I hope this won't be breaking anyone on 
2.7 and even with that headers can still be customized with CSS. Also as an 
additional note HtmlDiff.make_file internally uses make_table to construct full 
HTML file and that is also fixed. Maybe if one of the original authors of 
difflib would like to confirm it then it would be great.

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[issue35608] python3 multiprocessing queue deadlock when use thread and process at same time

[Antoine Pitrou]

Antoine Pitrou  added the comment:

Your input_thread puts StopIteration once input the queue.  But there are 
several worker processes popping from that queue, and only one of them will see 
the StopIteration.  So I'm not surprised other worker processes would be stuck 
waiting in their loop.

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[issue35588] Speed up mod/divmod/floordiv for Fraction type

[Mark Dickinson]

Mark Dickinson  added the comment:

> since the code with divmod() is simpler, I think it is worth to use it.

+1 from me, and +1 on the PR in general.

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[issue35612] Text wrap over text containing tab character

[Devika Sondhi]

New submission from Devika Sondhi :

textwrap.wrap does not seem to preserve tab character ('\t') in the text if it 
is not separated from other characters by a space.
Example:
>>> textwrap.wrap("Here is\tone line of text that is going to be wrapped after 
>>> 20 columns.",20)   
['Here is one line of', 'text that is going', 'to be wrapped after', '20 
columns.']
The tab is missing from the above output.
However, for text with \t separated by space, the behavior is as expected 
(shown below).
>>> textwrap.wrap("Here is \t one line of text that is going to be wrapped 
>>> after 20 columns.",20)  
>>>
['Here is  one', 'line of text that is', 'going to be wrapped', 'after 
20 columns.']

--
components: Tests
messages: 332712
nosy: Devika Sondhi
priority: normal
severity: normal
status: open
title: Text wrap over text containing tab character
versions: Python 3.7

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[issue35612] Text wrap over text containing tab character

[Steven D'Aprano]

Steven D'Aprano  added the comment:

I think you may be misunderstanding what you are seeing.

The documentation for textwrap.wrap says:

By default, tabs in 'text' are expanded with string.expandtabs()

which converts tabs to one or more spaces, enough to align to some 
multiple of column 8:

py> "He is\tone".expandtabs()
'He is   one'
py> "Her is\tone".expandtabs()
'Her is  one'
py> "Here is\tone".expandtabs()
'Here is one'
py> "THere is\tone".expandtabs()
'THere isone'

Can you confirm that this is the behaviour you are seeing? If so, I 
think it is correct and this bug report can be closed.

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[issue35155] Clarify Protocol Handlers in urllib.request Docs

[Denton Liu]

Denton Liu  added the comment:

Pinging again for updates. Would appreciate a PR review. Thanks!

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[issue35612] Text wrap over text containing tab character

[Devika Sondhi]

Devika Sondhi  added the comment:

I wasn't aware of this. Thanks for clarifying

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status: open -> closed

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[issue35613] Escaping string containing invalid characters as per XML

[Devika Sondhi]

New submission from Devika Sondhi :

As per XML 1.0 and 1.1 specs, the null character is treated as invalid in an 
XML doc. (https://en.wikipedia.org/wiki/Valid_characters_in_XML)
Shouldn't invalid xml characters be omitted while escaping?
The current behavior(tested on Python 3.7) is as follows:

>>> from xml.sax.saxutils import escape
>>> escape("a\u\u0001\u0008\u000b\u000c\u000e\u001fb")
'a\x00\x01\x08\x0b\x0c\x0e\x1fb'

--
messages: 332716
nosy: Devika Sondhi
priority: normal
severity: normal
status: open
title: Escaping string containing invalid characters as per XML
versions: Python 3.7

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[issue35609] Improve of abc.py docstring

[Emmanuel Arias]

Emmanuel Arias  added the comment:

> Double spaces between sentences increase readability. This is not a bug.

hmm ok. I can see other docstring with not double spaces. But I will ignore. 

> Since abstractclassmethod and like are deprecated and should not be used in 
> new code, I do not see a value of extending their docstrings. 

Ok, you are right. 

> Too verbose docstrings make using the module help less convenient. I would 
> rather remove existing examples from docstrings. The module documentation 
> contains more modern examples.

Do you say that is convenient remove the examples? I can do it! But in defense 
of the examples on docstring I think those are good, because the are the most 
quickly reference when coding and those are use by IDE.

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[issue35609] Improve of abc.py docstring

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

These examples teach you how to use abstractclassmethod and similar decorators. 
But first, docstrings are not tutorial, and second, you should not use them in 
new code at all, because they are deprecated.

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[issue33661] urllib may leak sensitive HTTP headers to a third-party web site

[Katsuhiko YOSHIDA]

Katsuhiko YOSHIDA  added the comment:

According to RFC7235 (https://tools.ietf.org/html/rfc7235#section-4.1), 
WWW-Authenticate header is sent from server to client. And it has not 
credential data. 

Also, Cookie2 header is already obsoleted by RFC6295 
(https://tools.ietf.org/html/rfc6265).

So, I think that both "Authorization" and "Cookie" are enough.

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[issue35614] Broken help() on metaclasses

[Serhiy Storchaka]

New submission from Serhiy Storchaka :

$ ./python -m pydoc abc
Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 192, in _run_module_as_main
return _run_code(code, main_globals, None,
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 85, in _run_code
exec(code, run_globals)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 2765, in 
cli()
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 2727, in cli
help.help(arg)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1967, in help
elif request: doc(request, 'Help on %s:', output=self._output)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1690, in doc
pager(render_doc(thing, title, forceload))
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1683, in render_doc
return title % desc + '\n\n' + renderer.document(object, name)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 385, in document
if inspect.ismodule(object): return self.docmodule(*args)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1182, in docmodule
contents.append(self.document(value, key, name))
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 386, in document
if inspect.isclass(object): return self.docclass(*args)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1258, in docclass
(str(cls.__name__) for cls in object.__subclasses__()
TypeError: descriptor '__subclasses__' of 'type' object needs an argument

$ ./python -m pydoc enum
Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 192, in _run_module_as_main
return _run_code(code, main_globals, None,
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 85, in _run_code
exec(code, run_globals)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 2765, in 
cli()
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 2727, in cli
help.help(arg)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1967, in help
elif request: doc(request, 'Help on %s:', output=self._output)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1690, in doc
pager(render_doc(thing, title, forceload))
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1683, in render_doc
return title % desc + '\n\n' + renderer.document(object, name)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 385, in document
if inspect.ismodule(object): return self.docmodule(*args)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1182, in docmodule
contents.append(self.document(value, key, name))
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 386, in document
if inspect.isclass(object): return self.docclass(*args)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1258, in docclass
(str(cls.__name__) for cls in object.__subclasses__()
TypeError: descriptor '__subclasses__' of 'type' object needs an argument

"object" is a metaclass (abc.ABCMeta or enum.EnumMeta) in tracebacks above.

The regression was introduced in issue8525.

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components: Library (Lib)
messages: 332720
nosy: CuriousLearner, belopolsky, eric.araujo, ncoghlan, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Broken help() on metaclasses
type: behavior
versions: Python 3.8

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[issue8525] Display exceptions' subclasses in help()

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

This caused a regression. See issue35614 for details.

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[issue35609] Improve of abc.py docstring

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue35609] Improve of abc.py docstring

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue35609] Improve of abc.py docstring

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

After some thoughts, I'm no longer sure that this is a correct change. The user 
can use this for highlighting the part of the column header, adding links or 
images, displaying complex multiline headers. I suspect that this change will 
break some existing code that uses difflib.HtmlDiff.make_table() properly, 
passing escaped strings.

I think now that this change should be reverted, and we should document instead 
that "fromdesc" and "todesc" are interpreted as an HTML text, and user data 
should be properly escaped for using in headers.

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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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[issue35608] python3 multiprocessing queue deadlock when use thread and process at same time

[Tim Peters]

Tim Peters  added the comment:

Antoine, alas, it's subtler than that.  The worker process (process_func()) 
puts _another_ `StopIteration` on the input queue in its `finally` clause.  So 
the first worker process to finish adds back a sentinel for the next worker to 
see, and so on.  At the end, one StopIteration is left on input_queue (added by 
the last worker to finish).

Everything shuts down cleanly for me on 64-bit Win10 Py 3.7.2 no matter what 
input I tried, so I can't reproduce.

The OP really needs to identify _where_ it's hanging, and when (after all input 
has been read?  somewhere "random in the middle"? ...), and if at all possible 
supply an input on which it does hang.

The OP should also try 3.7.2.

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[issue35603] table header in output of difflib.HtmlDiff.make_table is not escaped and can be rendered as code in the browser

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

Thanks Serhiy for the input. I initially thought this should be escaped since 
content was escaped and the same for header since user input taken directly 
could result in XSS. Maybe someone might using this undocumented feature 
intentionally that might not be worth breaking.

I will make a PR for this to be noted in docs that the parameters are 
interpreted as HTML.

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[issue35613] Escaping string containing invalid characters as per XML

[Ned Deily]

Ned Deily  added the comment:

This question has come up before.  See Issue13648 where it was pointed out that 
null characters "are forbidden both in raw form *and* in escaped form. So even 
if they get escaped, they *still* will lead to errors. So there is no point in 
escaping them."

--
nosy: +ned.deily
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> xml.sax.saxutils.escape does not escapes \x00

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[issue35614] Broken help() on metaclasses

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

It fails also for builtin "type".

$ ./python -m pydoc type
Traceback (most recent call last):
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 192, in _run_module_as_main
return _run_code(code, main_globals, None,
  File "/home/serhiy/py/cpython/Lib/runpy.py", line 85, in _run_code
exec(code, run_globals)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 2765, in 
cli()
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 2727, in cli
help.help(arg)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1967, in help
elif request: doc(request, 'Help on %s:', output=self._output)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1690, in doc
pager(render_doc(thing, title, forceload))
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1683, in render_doc
return title % desc + '\n\n' + renderer.document(object, name)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 386, in document
if inspect.isclass(object): return self.docclass(*args)
  File "/home/serhiy/py/cpython/Lib/pydoc.py", line 1258, in docclass
(str(cls.__name__) for cls in object.__subclasses__()
TypeError: descriptor '__subclasses__' of 'type' object needs an argument

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[issue35614] Broken help() on metaclasses

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

There are two ways of solving this issue: 1) skip this chunk of code if object 
is a type subclass, 2) use `type.__subclasses__(object)` instead of 
`object.__subclasses__()`.

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[issue35583] (glibc2.28/MIPS32EL) python 3.7.x interpreter segmentation fault (3.6.x/2.7.x compile fine)

[Gagan]

Gagan  added the comment:

hello everyone.

the core problem was that the 3.x series configure file includes a "-lintl" 
flag when it discovers the libintl header. in 2.x, this was not the case.

so when configure is checking for wchar_t, the inclusion of -lintl (as opposed 
to libgnuintl, which is what i have), it fails and returns 0 which is then the 
SIZEOF_WCHAR_T in the pyconfig.h file.

it turns out Modules/main.c relies more on wchar_t in 3.7 than it does in 
3.6.x, which is why i did not see this problem arise when compiling the 
interpreter to complete module compilation (and tests).

however, in 3.7.x, there is additional use of wchar_t and thus the segmentation 
faults (allocating 0 bytes).

hope this helps others who may compile the GNU flavour of libintl (see 
https://lists.gnu.org/archive/html/bug-gnu-utils/2010-07/msg2.html for more 
information. i learned a little too).

CHEERS EH

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

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[issue35614] Broken help() on metaclasses

[Sanyam Khurana]

Change by Sanyam Khurana :


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[issue35614] Broken help() on metaclasses

[Sanyam Khurana]

Change by Sanyam Khurana :


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[issue35614] Broken help() on metaclasses

[Sanyam Khurana]

Change by Sanyam Khurana :


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[issue35602] cleanup code may fail in test_asyncio.test_unix_events.SelectorEventLoopUnixSockSendfileTests

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset d51324a2f5d172665f8824b25456c9822797fc84 by Pablo Galindo in 
branch 'master':
bpo-35602: Make sure the transport is always closed in 
SelectorEventLoopUnixSockSendfileTests (GH-11338)
https://github.com/python/cpython/commit/d51324a2f5d172665f8824b25456c9822797fc84


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[issue35602] cleanup code may fail in test_asyncio.test_unix_events.SelectorEventLoopUnixSockSendfileTests

[miss-islington]

Change by miss-islington :


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[issue35602] cleanup code may fail in test_asyncio.test_unix_events.SelectorEventLoopUnixSockSendfileTests

[miss-islington]

Change by miss-islington :


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[issue35602] cleanup code may fail in test_asyncio.test_unix_events.SelectorEventLoopUnixSockSendfileTests

[miss-islington]

Change by miss-islington :


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[issue35601] Race condition in test_signal_handling_args x86-64 High Sierra 3.75

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

I am going to close this one as the only branch left is 3.6 and is on security 
fixes only.

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[issue35602] cleanup code may fail in test_asyncio.test_unix_events.SelectorEventLoopUnixSockSendfileTests

[miss-islington]

miss-islington  added the comment:


New changeset fe06646d186780881fa5ee61442886a6d7cf9f08 by Miss Islington (bot) 
in branch '3.7':
bpo-35602: Make sure the transport is always closed in 
SelectorEventLoopUnixSockSendfileTests (GH-11338)
https://github.com/python/cpython/commit/fe06646d186780881fa5ee61442886a6d7cf9f08


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[issue35602] cleanup code may fail in test_asyncio.test_unix_events.SelectorEventLoopUnixSockSendfileTests

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue35578] Add test for Argument Clinic converters

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Is there anything left in this issue or we can close it?

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[issue20171] Derby #2: Convert 115 sites to Argument Clinic in Modules/_cursesmodule.c

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:

Should we close this issue or is anything left in this Derby?

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[issue35615] "RuntimeError: Dictionary changed size during iteration" when copying a WeakValueDictionary

[Fish Wang]

New submission from Fish Wang :

I come across this issue recently when developing a multi-threaded PySide2 (Qt) 
application. When I'm calling .copy() on a WeakValueDictionary, there is a high 
chance that my application crashes with the following stack backtrace:

--

Traceback (most recent call last):
  File "F:\angr\angr-management\angrmanagement\ui\widgets\qdisasm_graph.py", 
line 239, in mouseDoubleClickEvent
block.on_mouse_doubleclicked(event.button(), 
self._to_graph_pos(event.pos()))
  File "F:\angr\angr-management\angrmanagement\ui\widgets\qblock.py", line 130, 
in on_mouse_doubleclicked
obj.on_mouse_doubleclicked(button, pos)
  File "F:\angr\angr-management\angrmanagement\ui\widgets\qinstruction.py", 
line 128, in on_mouse_doubleclicked
op.on_mouse_doubleclicked(button, pos)
  File "F:\angr\angr-management\angrmanagement\ui\widgets\qoperand.py", line 
162, in on_mouse_doubleclicked
self.disasm_view.jump_to(self._branch_target, src_ins_addr=self.insn.addr)
  File "F:\angr\angr-management\angrmanagement\ui\views\disassembly_view.py", 
line 258, in jump_to
self._jump_to(addr)
  File "F:\angr\angr-management\angrmanagement\ui\views\disassembly_view.py", 
line 372, in _jump_to
self._display_function(function)
  File "F:\angr\angr-management\angrmanagement\ui\views\disassembly_view.py", 
line 343, in _display_function
vr = self.workspace.instance.project.analyses.VariableRecoveryFast(the_func)
  File "f:\angr\angr\angr\analyses\analysis.py", line 109, in __call__
oself.__init__(*args, **kwargs)
  File 
"f:\angr\angr\angr\analyses\variable_recovery\variable_recovery_fast.py", line 
618, in __init__
self._analyze()
  File "f:\angr\angr\angr\analyses\forward_analysis.py", line 557, in _analyze
self._analysis_core_graph()
  File "f:\angr\angr\angr\analyses\forward_analysis.py", line 580, in 
_analysis_core_graph
changed, output_state = self._run_on_node(n, job_state)
  File 
"f:\angr\angr\angr\analyses\variable_recovery\variable_recovery_fast.py", line 
712, in _run_on_node
input_state = prev_state.merge(input_state, successor=node.addr)
  File 
"f:\angr\angr\angr\analyses\variable_recovery\variable_recovery_fast.py", line 
488, in merge
merged_register_region = 
self.register_region.copy().replace(replacements).merge(other.register_region,
  File "f:\angr\angr\angr\keyed_region.py", line 159, in copy
kr._object_mapping = self._object_mapping.copy()
  File "D:\My Program Files\Python37\lib\weakref.py", line 174, in copy
for key, wr in self.data.items():
RuntimeError: dictionary changed size during iteration

--

I went ahead and read the related methods in Lib\weakref.py, and it seems to me 
that the WeakValueDictionary.copy() method is missing the protection of an 
_IterationGuard: It is iterating through self.data.items(), which, might have 
entries removed because of GC during the iteration.

It seems that this crash can be fixed by wrapping the iteration with `with 
_IterationGuard(self):`. It worked for me in my tests.

If my above analysis is correct, the following methods all require protection 
of _IterationGuard (which are currently missing):

- WeakValueDictionary.copy()
- WeakValueDictionary.__deepcopy__()
- WeakKeyDictionary.copy()
- WeakKeyDictionary.__deepcopy__()

Please let me know if this is a legitimate issue, in which case I will be happy 
to provide a patch. Thanks.

--
components: Library (Lib)
messages: 332734
nosy: Fish Wang
priority: normal
severity: normal
status: open
title: "RuntimeError: Dictionary changed size during iteration" when copying a 
WeakValueDictionary
type: crash
versions: Python 3.7

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[issue35599] asyncio windows_events.py IocpProactor bug

[Jeff Robbins]

Jeff Robbins  added the comment:

This issue is likely a duplicate of https://bugs.python.org/issue34323
which was reported in Python 3.5.

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[issue35605] backported patch requires new sphinx, minimum sphinx version was not bumped

[Julien Palard]

Julien Palard  added the comment:

The patch (try/except) to make 
https://github.com/python/cpython/pull/11251/files work with what Doc/conf.py 
says about minimum sphinx version (1.2) is OK for me.

No need to apply it on 3.7 which needs_sphinx 1.6.6 according to its 
Doc/conf.py.

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[issue35606] Add prod() function to the math module

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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pull_requests: +10676, 10677
stage:  -> patch review

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[issue35606] Add prod() function to the math module

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue35606] Add prod() function to the math module

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue35606] Add prod() function to the math module

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue35606] Add prod() function to the math module

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue33234] Improve list() pre-sizing for inputs with known lengths

[Pablo Galindo Salgado]

Pablo Galindo Salgado  added the comment:


New changeset 0e5f771f38138714415f665651de7e674fcebc38 by Pablo Galindo (Sergey 
Fedoseev) in branch 'master':
bpo-33234: Simplify list_preallocate_exact() (GH-11220)
https://github.com/python/cpython/commit/0e5f771f38138714415f665651de7e674fcebc38


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[issue33234] Improve list() pre-sizing for inputs with known lengths

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado :


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[issue35598] IDLE: Modernize config_key module

[Cheryl Sabella]

Change by Cheryl Sabella :


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[issue35598] IDLE: Modernize config_key module

[Cheryl Sabella]

Change by Cheryl Sabella :


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[issue35598] IDLE: Modernize config_key module

[Cheryl Sabella]

Change by Cheryl Sabella :


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[issue35598] IDLE: Modernize config_key module

[Cheryl Sabella]

Change by Cheryl Sabella :


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[issue35598] IDLE: Modernize config_key module

[Cheryl Sabella]

Change by Cheryl Sabella :


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[issue35598] IDLE: Modernize config_key module

[Cheryl Sabella]

Cheryl Sabella  added the comment:

PR11360 adds tests to increase coverage.  There isn't any refactor (moving 
translate_key) as part of this.  I also didn't add any GUI-related tests 
against the buttons, entry, or listbox, except for the cancel key (in case that 
helps with the new bug reported).

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[issue17404] ValueError: can't have unbuffered text I/O for io.open(1, 'wt', 0)

[Martin Panter]

Martin Panter  added the comment:

It is documented that buffering=0 is not supported in text mode. Look a handful 
of paragraphs down from 
:

“Pass 0 to switch buffering off (only allowed in binary mode)”

Amaury’s problem with the IDNA buffering encoder has now been reported 
separately in Issue 35611.

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[issue35611] open doesn't call IncrementalEncoder with final=True

[Martin Panter]

Martin Panter  added the comment:

FWIW this happens with the built-in IDNA codec, and Amaury gave a demonstration 
under .

I don’t think the “TextIOWrapper.flush” method should use final=True, but 
“close” and “detach” probably should.

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[issue35540] dataclasses.asdict breaks with defaultdict fields

[Rémi Lapeyre]

Change by Rémi Lapeyre :


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[issue35540] dataclasses.asdict breaks with defaultdict fields

[Rémi Lapeyre]

Change by Rémi Lapeyre :


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[issue35540] dataclasses.asdict breaks with defaultdict fields

[Rémi Lapeyre]

Change by Rémi Lapeyre :


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pull_requests: +10682, 10683, 10684
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[issue35583] (glibc2.28/MIPS32EL) python 3.7.x interpreter segmentation fault (3.6.x/2.7.x compile fine)

[Gagan]

Change by Gagan :


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[issue35540] dataclasses.asdict breaks with defaultdict fields

[Rémi Lapeyre]

Rémi Lapeyre  added the comment:

Hi @wrmsr, this happens because the constructor for `collections.defaultdict` 
differs from the one of `dict`.

I think the argument that collections.defaultdict is in the stdlib and should 
be supported is right, the changes in PR #11361 should do what you want.

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[issue35598] IDLE: Modernize config_key module

[miss-islington]

Change by miss-islington :


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[issue35598] IDLE: Modernize config_key module

[miss-islington]

Change by miss-islington :


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[issue35598] IDLE: Modernize config_key module

[Terry J. Reedy]

Terry J. Reedy  added the comment:


New changeset b0a6196ffd58ff91462191f426706897dc920eee by Terry Jan Reedy 
(Cheryl Sabella) in branch 'master':
bpo-35598: IDLE: Increase test coverage for config_key.py (#11360)
https://github.com/python/cpython/commit/b0a6196ffd58ff91462191f426706897dc920eee


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[issue35598] IDLE: Modernize config_key module

[miss-islington]

Change by miss-islington :


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[issue34778] Memoryview for column-major (f_contiguous) arrays from bytes impossible to achieve

[Laurent Gautier]

Laurent Gautier  added the comment:

Bump.

What are the next steps here ?

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[issue35598] IDLE: Modernize config_key module

[miss-islington]

miss-islington  added the comment:


New changeset 34aadec448f373b95653318e91f6f959354ffa89 by Miss Islington (bot) 
in branch '3.7':
bpo-35598: IDLE: Increase test coverage for config_key.py (GH-11360)
https://github.com/python/cpython/commit/34aadec448f373b95653318e91f6f959354ffa89


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[issue35616] Change references to '4.0'.

[Terry J. Reedy]

New submission from Terry J. Reedy :

https://docs.python.org/3/c-api/unicode.html#deprecated-py-unicode-apis
says "Deprecated since version 3.3, will be removed in version 4.0."
(I am aware that the quote above was written before we decided that '3.9' 
should be followed by '3.10' rather than '4.0' to avoid giving mis-impressions.)

There is currently no plan for a '4.0' and part of the reason is that it stirs 
up unnecessary negative feeling in people.  For example:
https://stackoverflow.com/questions/53899931/why-does-an-empty-string-in-python-sometimes-take-up-49-bytes-and-sometimes-51
The second most upvoted comment (9) is "seeing a reference to a "[Python] 4.0" 
is giving me anxiety..." – Mike Caron (11000+ reputation).  We, as well as 
they, don't need this.

When '4.0' was used in an asyncio deprecation, it was changed.  Let us do the 
same elsewhere.

--
assignee: docs@python
components: Documentation
messages: 332745
nosy: docs@python, terry.reedy, vstinner
priority: normal
severity: normal
stage: needs patch
status: open
title: Change references to '4.0'.
versions: Python 3.7, Python 3.8

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[issue35616] Change references to '4.0'.

[Emmanuel Arias]

Change by Emmanuel Arias :


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[issue35616] Change references to '4.0'.

[Emmanuel Arias]

Change by Emmanuel Arias :


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[issue35616] Change references to '4.0'.

[Emmanuel Arias]

Change by Emmanuel Arias :


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[issue35598] IDLE: Modernize config_key module

[Terry J. Reedy]

Change by Terry J. Reedy :


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[issue35598] IDLE: Modernize config_key module

[Terry J. Reedy]

Change by Terry J. Reedy :


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[issue35616] Change references to '4.0'.

[Emmanuel Arias]

Emmanuel Arias  added the comment:

Same similar occur with other docs

$ git grep 'deprecated-removed::.*4\.0'
Doc/c-api/arg.rst:   .. deprecated-removed:: 3.3 4.0
Doc/c-api/arg.rst:   .. deprecated-removed:: 3.3 4.0
Doc/c-api/arg.rst:   .. deprecated-removed:: 3.3 4.0
Doc/c-api/arg.rst:   .. deprecated-removed:: 3.3 4.0
Doc/c-api/long.rst:   .. deprecated-removed:: 3.3 4.0
Doc/library/array.rst:   .. deprecated-removed:: 3.3 4.0
Doc/library/functions.rst:   .. deprecated-removed:: 3.4 4.0

--
nosy: +eamanu

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