[issue30520] loggers can't be pickled

[Antoine Pitrou]

New submission from Antoine Pitrou:

Loggers could simply be pickled and unpickled by name, but pickle currently 
tries the hard way:

>>> import pickle
>>> import logging
>>> log = logging.getLogger('foo')
>>> pickle.dumps(log)
Traceback (most recent call last):
  File "", line 1, in 
pickle.dumps(log)
TypeError: can't pickle _thread.RLock objects

--
components: Library (Lib)
messages: 294818
nosy: pitrou, vinay.sajip
priority: normal
severity: normal
status: open
title: loggers can't be pickled
type: enhancement
versions: Python 3.7

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[issue30521] IDLE: Add navigate bar and replace current goto dialog

[Louie Lu]

New submission from Louie Lu:

Propose a sublime-like navigate bar to replace current goto dialog.

Navigate bar current support two different mode: prefix ':' for goto line, and 
prefix '@' for goto symbol.

When user use shortcut Ctrl+G to open goto line, it will prompt out a navigate 
bar on the top of the editor.text with prefix ':', user can enter valid lineno, 
and it will highlight the line on the editor.

After return, it will close the navigate bar and clear the highlight, user 
cursor will be set to the target lineno.

--
assignee: terry.reedy
components: IDLE
messages: 294819
nosy: louielu, terry.reedy
priority: normal
severity: normal
status: open
title: IDLE: Add navigate bar and replace current goto dialog
type: enhancement
versions: Python 3.7

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[issue30521] IDLE: Add navigate bar and replace current goto dialog

[Louie Lu]

Changes by Louie Lu :


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[issue30522] Allow replacing a StreamHandler's stream

[Antoine Pitrou]

New submission from Antoine Pitrou:

Right now it is probably possible using something like:

handler.acquire()
try:
handler.flush()
handler.stream = new_stream
finally:
handler.release()

but it would be nice to have an officially-supported method to do that.

Context: if I reconfigure sys.stderr, I'd like to update all handlers that have 
a reference to the old sys.stderr.

--
messages: 294820
nosy: pitrou, vinay.sajip
priority: normal
severity: normal
status: open
title: Allow replacing a StreamHandler's stream
type: enhancement
versions: Python 3.7

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[issue30522] Allow replacing a StreamHandler's stream

[STINNER Victor]

STINNER Victor added the comment:

Which StreamHandler class? Is this issue related to logging? If yes, please 
mention it in the title ;-)

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nosy: +haypo

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[issue30522] Allow replacing a logging.StreamHandler's stream

[Antoine Pitrou]

Antoine Pitrou added the comment:

Oh, yes, sorry.  This is about logging.

--
title: Allow replacing a StreamHandler's stream -> Allow replacing a 
logging.StreamHandler's stream

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[issue25324] Importing tokenize modifies token

[Albert-Jan Nijburg]

Albert-Jan Nijburg added the comment:

I've updated token.rst and Misc/NEWS. Let me know if the wording is correct.

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[issue30448] test_subprocess creates a core dump on FreeBSD

[STINNER Victor]

STINNER Victor added the comment:

Sadly, I'm unable to reproduce the issue on my FreeBSD 11 VM :-(

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[issue30523] unittest: add --list-tests option to only display the list of test names, don't run tests

[STINNER Victor]

New submission from STINNER Victor:

Attached pull requests adds a --list-tests option to only display the list of 
test names, don't run tests.

It's a first step to implement the issue #29512: "regrtest refleak: implement 
bisection feature".

--
components: Tests
messages: 294825
nosy: ezio.melotti, haypo, michael.foord, rbcollins
priority: normal
severity: normal
status: open
title: unittest: add --list-tests option to only display the list of test 
names, don't run tests
type: enhancement
versions: Python 3.7

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[issue30403] PEP 547: Running extension modules using -m switch

[Nick Coghlan]

Nick Coghlan added the comment:

This proposal is now PEP 547: 
https://github.com/python/peps/commit/cd84e206f58cf929eea235fb894cff1db2a1dabf

--
title: Running extension modules using -m switch -> PEP 547: Running extension 
modules using -m switch

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[issue30523] unittest: add --list-tests option to only display the list of test names, don't run tests

[STINNER Victor]

Changes by STINNER Victor :


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[issue29512] regrtest refleak: implement bisection feature

[STINNER Victor]

STINNER Victor added the comment:

First step: I created the issue #30523, "unittest: add --list-tests option to 
only display the list of test names, don't run tests".

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[issue30523] unittest: add --list-tests option to only display the list of test names, don't run tests

[STINNER Victor]

STINNER Victor added the comment:

Maybe the feature already exists but I failed to find it. Since I'm suprised 
that nobody implements that before (in unittest), I wait for a first feedback 
before starting to document the new feature and to write an unit test for it.

support.run_unittest() doesn't use unittest.main() and so don't support the new 
--list-tests option.

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[issue30523] unittest: add --list-tests option to only display the list of test names, don't run tests

[STINNER Victor]

STINNER Victor added the comment:

I wrote this patch because I'm trying to find which test of test_threading 
leaks a reference:

./python -m test -R 3:3 test_threading

Usually, I modify Lib/test/test_threading.py to remove tests one by one. I 
"bisect" the test manually. But this process is slow and painful, and it seems 
like we have many tests which leak references!

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[issue30523] unittest: add --list-tests option to only display the list of test names, don't run tests

[Julien Palard]

Julien Palard added the comment:

If it can be of any help, pytest have a "pytest --collect-only", it may make 
sense to use the same option name for consistency. I also though about 
"--dry-run" but I still prefer --list-tests or --collect-only.

--
nosy: +mdk

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[issue30517] Enum does not recognize enum.auto as unique values

[Max]

Max added the comment:

Ah sorry about that ... Yes, everything works fine when used properly.

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

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[issue25324] Importing tokenize modifies token

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

If move COMMENT, NL and ENCODING to the token module, their documentation 
should be moved from tokenize.rst to token.rst.

I have asked on Python-Dev whether this is a right way. [1]

[1] https://mail.python.org/pipermail/python-dev/2017-May/148080.html

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[issue30455] Generate C code from token.py and not vice versa

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The regular expression tokenize.Funny also can be generated. Information is not 
enough for distinguish between Operator, Bracket and Special, but seems this 
isn't needed.

Some token names can be generated from Grammar/Grammar. But needed an 
additional mapping for relations between token strings and names ('+' <-> PLUS, 
etc).

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[issue6721] Locks in the standard library should be sanitized on fork

[Daniel Birnstiel]

Daniel Birnstiel added the comment:

While having to deal with this bug for a while I have written a small library 
using `pthread_atfork`: https://github.com/Birne94/python-atfork-lock-release

It allows registering atfork-hooks (similar to the ones available by now) and 
frees the stdout/stderr as well as manually provided io locks. I guess it uses 
some hacky ways to get the job done, but resolved the issue for me and has been 
working without problems for some weeks now.

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[issue30524] iter(classmethod, sentinel) broken for Argument Clinic class methods?

[Martijn Pieters]

New submission from Martijn Pieters:

I'm not sure where exactly the error lies, but issue 27128 broke iter() for 
Argument Clinic class methods. The following works in Python 3.5, but not in 
Python 3.6:

from datetime import datetime
from asyncio import Task

next(iter(datetime.now, None))
next(iter(Task.all_tasks, None))

In 3.6 StopIteration is raised:

>>> next(iter(datetime.now, None))
Traceback (most recent call last):
  File "", line 1, in 
StopIteration
>>> next(iter(Task.all_tasks, None))
Traceback (most recent call last):
  File "", line 1, in 
StopIteration

(In 3.5 a `datetime.datetime` and `set` object are produced, respectively)

The only thing these two methods have in common is that they are class methods 
with no arguments, parsed out by the Argument Clinic generated code (so using 
_PyArg_Parser).

What appears to have changed is that iter() was switched from using 
PyObject_Call to _PyObject_FastCall, see 
https://github.com/python/cpython/commit/99ee9c70a73ec2f3db68785821a9f2867c3f637f

--
messages: 294835
nosy: mjpieters
priority: normal
severity: normal
status: open
title: iter(classmethod, sentinel) broken for Argument Clinic class methods?
versions: Python 3.6, Python 3.7

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[issue30524] iter(classmethod, sentinel) broken for Argument Clinic class methods?

[Martijn Pieters]

Martijn Pieters added the comment:

Forgot to addthis: this bug was found via 
https://stackoverflow.com/questions/44283540/iter-not-working-with-datetime-now

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[issue30509] Optimize calling type slots

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

PR 1883 seems doesn't affect indexing, PR 1861 makes it 1.7 times faster.

$ ./python -m perf timeit -s 'class A:' -s '  def __getitem__(s, i): return 
t[i]' -s 'a = A(); t = tuple(range(1000))' --duplicate 100 'list(a)'

Unpatched:  Mean +- std dev: 498 us +- 26 us
PR 1863:Mean +- std dev: 496 us +- 31 us
PR 1861:Mean +- std dev: 288 us +- 7 us

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[issue30524] iter(classmethod, sentinel) broken for Argument Clinic class methods?

[Emanuel Barry]

Changes by Emanuel Barry :


--
nosy: +haypo, serhiy.storchaka
stage:  -> needs patch
type:  -> behavior

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[issue30525] Expose SCTs on TLS connections

[Alex Gaynor]

New submission from Alex Gaynor:

CT (https://www.certificate-transparency.org/) is starting to become a thing! 
It'd be great if we exposed SCTs (whether from TLS extensions, OCSP, or 
embedded in the certificate) for TLS connections. This would allow higher level 
protocols to begin acting on them.

This would need to be an OpenSSL 1.1.0+ feature.

--
assignee: christian.heimes
components: SSL
messages: 294838
nosy: alex, christian.heimes, dstufft, janssen
priority: normal
severity: normal
status: open
title: Expose SCTs on TLS connections
versions: Python 3.7

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[issue30509] Optimize calling type slots

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Sorry, wrong data. PR 1883 makes indexing 1.2 times faster, PR 1861 makes it 
1.7 times faster

$ ./python -m perf timeit -s 'class A:' -s '  def __getitem__(s, i): return 
t[i]' -s 'a = A(); t = tuple(range(1000))' --duplicate 100 'list(a)'

Unpatched:  Mean +- std dev: 498 us +- 26 us
PR 1883:Mean +- std dev: 351 us +- 10 us
PR 1861:Mean +- std dev: 288 us +- 7 us

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[issue30509] Optimize calling type slots

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
Removed message: http://bugs.python.org/msg294837

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[issue30523] unittest: add --list-tests option to only display the list of test names, don't run tests

[STINNER Victor]

STINNER Victor added the comment:

I used testr which has a --list-tests option:
http://testrepository.readthedocs.io/en/latest/MANUAL.html#listing-tests

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[issue30524] iter(classmethod, sentinel) broken for Argument Clinic class methods?

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It works in 3.5 and 3.7, but raises a StopIteration in 3.6.

--
components: +Interpreter Core
keywords: +3.6regression
versions:  -Python 3.7

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[issue25324] Importing tokenize modifies token

[STINNER Victor]

STINNER Victor added the comment:


New changeset fc354f07855a9197e71f851ad930cbf5652f9160 by Victor Stinner 
(Albert-Jan Nijburg) in branch 'master':
bpo-25324: copy tok_name before changing it (#1608)
https://github.com/python/cpython/commit/fc354f07855a9197e71f851ad930cbf5652f9160


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[issue30509] Optimize calling type slots

[STINNER Victor]

STINNER Victor added the comment:

FYI you can use "./python -m perf timeit --compare-to=./python-ref" if you keep 
the "reference" Python (unpatched), so perf computes for you the "?.??x 
slower/faster" factor ;-)

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[issue30507] Elements reports it is a list on Element.remove

[Jim Fasarakis-Hilliard]

Jim Fasarakis-Hilliard added the comment:

Thanks for the feedback, Raymond. I'll try to shift my focus on more pressing 
issues. (Closing as rejected)

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

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[issue29286] Use METH_FASTCALL in str methods

[STINNER Victor]

Changes by STINNER Victor :


--
pull_requests: +1964

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[issue30524] iter(classmethod, sentinel) broken for Argument Clinic class methods?

[STINNER Victor]

Changes by STINNER Victor :


--
pull_requests: +1962

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[issue29259] Add tp_fastcall to PyTypeObject: support FASTCALL calling convention for all callable objects

[STINNER Victor]

Changes by STINNER Victor :


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[issue30524] iter(classmethod, sentinel) broken for Argument Clinic class methods?

[STINNER Victor]

STINNER Victor added the comment:

Oh, it's my fault: it's a bug coming from FASTCALL optimizations. The strange 
thing is that the bug wasn't catched by the giant Python test suite :-(

I knew that _PyStack_UnpackDict() has a bug in Python 3.6, but I completely 
forgot to fix it :-(

https://github.com/python/cpython/pull/1886 fixes the bug, but has not test yet.

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[issue30524] iter(classmethod, sentinel) broken for Argument Clinic class methods?

[Raymond Hettinger]

Changes by Raymond Hettinger :


--
priority: normal -> high

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[issue30095] HTMLCalendar allow custom classes

[Walter Dörwald]

Walter Dörwald added the comment:

See my comments on the pull request: https://github.com/python/cpython/pull/1439

After you address those, IMHO this is ready to be merged.

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[issue30524] iter(classmethod, sentinel) broken for Argument Clinic class methods?

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

next(iter(datetime.now, None)) can be turned into a nice test.

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[issue30509] Optimize calling type slots

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you, I know about this, but it takes twice more time, so I don't use it 
regularly. And it doesn't allow to compare three versions. :-(

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[issue30504] Allow inspecting buffering attribute of IO objects

[Antoine Pitrou]

Antoine Pitrou added the comment:

Ah, I had forgotten about the `line_buffering` attribute. Thank you.

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[issue30526] Allow setting line_buffering on existing TextIOWrapper

[Antoine Pitrou]

New submission from Antoine Pitrou:

Currently, if you want to change the line buffering behaviour of standard 
streams, you can create a new stream and assign it to 
sys.{stdout,stderr,stdin}.  Unfortunately, it is common for references to the 
old streams to be stored in various places (such as logging configuration, or 
third-party libraries).  Replacing them all is probably a hopeless cause.  It 
would be much better if one could simply write `sys.stdout.line_buffering = 
True` and be done with it.

--
components: IO
messages: 294850
nosy: benjamin.peterson, pitrou, stutzbach
priority: normal
severity: normal
status: open
title: Allow setting line_buffering on existing TextIOWrapper
type: enhancement
versions: Python 3.7

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[issue30527] PyMemoryView_FromBuffer memory leak

[Christoph Reiter]

New submission from Christoph Reiter:

I'm using the following code

PyObject *
get_memoryview (PyObject *self) {
Py_buffer view;

...

// this takes a ref on self
if (PyBuffer_FillInfo (&view, self, buffer, length, 0, 0) < 0)
return NULL;

// this returns a  object
return PyMemoryView_FromBuffer (&view);
}

The problem is that when I call release() on the returned memory object
the buffer does not get release and as a result the exporter leaks.

Am I missing something or is this a bug?

--
messages: 294851
nosy: lazka
priority: normal
severity: normal
status: open
title: PyMemoryView_FromBuffer memory leak

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[issue30526] Allow setting line_buffering on existing TextIOWrapper

[Antoine Pitrou]

Changes by Antoine Pitrou :


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[issue30527] PyMemoryView_FromBuffer memory leak

[Stefan Krah]

Stefan Krah added the comment:

"Py_buffer view" is stack allocated. One can use memoryviews based on such 
buffers *inside* a function, but not return them.

--
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[issue30527] PyMemoryView_FromBuffer memory leak

[Christoph Reiter]

Christoph Reiter added the comment:

hm, ok.

Any idea how I can create a memoryview that is usable from Python then?

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[issue30528] ipaddress.IPv{4,6}Network.reverse_pointer is broken

[Hristo Venev]

New submission from Hristo Venev:

`ipaddress.IPv4Network('127.0.0.0/16').reverse_pointer = 
'0/16.0.0.127.in-addr.arpa'` is definitely wrong. I think it should be 
'0.127.in-addr.arpa'.

A funnier case, `ipaddress.IPv6Network('2001:db8::/32').reverse_pointer = 
'2.3./.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.ip6.arpa'`.

For the case where no single reverse pointer exists (e.g. `127.0.0.0/13`), I 
think it should be `None`.

--
components: Library (Lib)
messages: 294854
nosy: h.venev
priority: normal
severity: normal
status: open
title: ipaddress.IPv{4,6}Network.reverse_pointer is broken
type: behavior
versions: Python 3.5

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[issue30527] PyMemoryView_FromBuffer memory leak

[Stefan Krah]

Stefan Krah added the comment:

"Py_buffer view" needs to go into the exporting object.  That object needs  a 
getbufferproc().  That getbufferproc() can use  PyBuffer_FillInfo() to fill in 
the view that is now kept alive because it's in the object.

The object then supports the buffer protocol and memoryviews can be created 
automatically from the Python level without any further C code.

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Antoine Pietri]

Antoine Pietri added the comment:

In Windows/Python 3.6, the behavior matches the documented one, so this could 
actually be an important silent bug when executing a code wrote for Windows in 
another OS. I'd argue to fix it in 3.6 too.

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Steve Dower]

Steve Dower added the comment:

This is definitely a bug if it really behaves as described.

PRs for fixing the functionality are welcome - I'm inclined to say fix it in 
3.6 as well, but it might be too big a behavioural change if people are already 
working around it.

--
nosy: +steve.dower

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[issue30527] PyMemoryView_FromBuffer memory leak

[Christoph Reiter]

Christoph Reiter added the comment:

Ah, so if I understand correctly, exposing always requires something 
implementing the buffer interface in some way. I might require multiple 
different memoryviews for this object, so maybe some proxy object implementing 
it might work.

Thanks Stefan for your quick help.

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

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Antoine Pietri]

Antoine Pietri added the comment:

By the way, I'm pasting what I said on the PR here: 

For what it's worth, this bug was the cause of an important downtime in our 
organization, because someone needed to normalize a path that was later passed 
to a .mkdir(parents=True), and it was, in some cases, silently doing the mkdir 
of a wrong path instead of creating all the parents.

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[issue30527] PyMemoryView_FromBuffer memory leak

[Stefan Krah]

Stefan Krah added the comment:

Sorry, actually I wasn't totally clear:  The exporting object just needs a 
getbufferproc() that can respond to buffer requests and keeps track of how many 
views are exported.

"View in the object" is misleading and not necessary; it can be used for some 
advanced stuff.

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Antoine Pitrou]

Antoine Pitrou added the comment:

This is definitely a bug and I think the fixes should be backported.

--
versions: +Python 3.5

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Steve Dower]

Steve Dower added the comment:

Ah, didn't catch that it doesn't occur on Windows - that explains why I've 
never seen it before.

Yes, definitely fix and backport. Adding the RMs in case they want to delay any 
upcoming releases to get the fix.

--
nosy: +larry, ned.deily
priority: normal -> critical

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Zopieux]

Zopieux added the comment:

I agree bpo-30177 is not a suitable fix for this issue, as it fixes the doc 
instead of fixing the actual underlying bug in the function behavior.

This bug can lead to files being added to the wrong (parent) directory, which 
is quite critical.

--
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[issue30177] pathlib.resolve(strict=False) only includes first child

[Ned Deily]

Ned Deily added the comment:

We have less than 2 weeks until cutoff for 3.6.2 so it would be great if 
someone would take this on.

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[issue30392] default webbrowser fails on macOS Sierra 10.12.5

[Ned Deily]

Ned Deily added the comment:

Good news!  Apple appears to have fixed the osascript regression in the most 
recent macOS 10.12.6 public beta (version 2).  So I'm going to mark this issue 
as "pending fixed" until the official release of 10.12.6.

--
resolution:  -> out of date
stage:  -> resolved
status: open -> pending

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[issue30465] FormattedValue expressions have wrong lineno and col_offset information

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I have concerns about following cases.

* f-string containing multiple equivalent subexpressions:

f'{x} {x}'

or

f'''
{x}
{x}
'''

* f-string containing escaped newlines:

f'''\
\
{x}\
\
'''

The tests look slightly verbose and fragile to me. If once the parser will 
produce more efficient tree (see issue26415), the tests may fail. Needed more 
tests (for cases mentioned above), and adding them will add more verbose code. 
Maybe just find the child (or several children) of specific type and check 
lineno and col_offset only for it and few its children? If this will make the 
tests simpler. But if tests can't be made simpler, we should live with this.

--
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[issue30527] PyMemoryView_FromBuffer memory leak

[Christoph Reiter]

Christoph Reiter added the comment:

In case someone ends up here with a similar problem, here is my solution using 
a proxy object: 
https://github.com/pygobject/pycairo/blob/4ab80df68dd99a8e4bfb0c6a88dc5b2a9b0f3f10/cairo/bufferproxy.c

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[issue17852] Built-in module _io can loose data from buffered files at exit

[Neil Schemenauer]

Neil Schemenauer added the comment:

Well, I just spent a couple of hours debugging a problem caused by this issue.  
You could argue that I should be calling close() on all of my file-like objects 
but I agree with Armin that the current "most of the time it works" behaviour 
is quite poor.

In my case, the issue is exactly what Antoine Pitrou suggests: if the FileIO 
object gets finalized before the BufferedIO object wrapping it then the 
buffered data gets lost. That depends on the order that the GC calls finalizers.

Armin's suggestion of keeping a list of open buffered files and flushing them 
before exiting seems like a simple and robust solution.  Having a warning for 
unclosed files is fine but in order to make porting Python 2 code as painless 
as possible, matching the safer behavior of Python 2 would be worth the extra 
bit of flush logic.

--
nosy: +nascheme

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[issue30529] Incorrect error messages for invalid whitespaces in f-string subexpressions

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

Python parser supports only ' ', '\t', '\x0c' and '\r' as whitespaces. The 
parser of f-strings raises incorrect error messages for subexpressions 
consistent only from whitespaces, if they contain whitespaces out this set.

>>> eval("\xa0")
Traceback (most recent call last):
  File "", line 1, in 
  File "", line 1
 
^
SyntaxError: invalid character in identifier
>>> eval("f'''{\xa0}'''")
Traceback (most recent call last):
  File "", line 1, in 
  File "", line 1
SyntaxError: f-string: empty expression not allowed

--
components: Interpreter Core
messages: 294869
nosy: eric.smith, serhiy.storchaka
priority: normal
severity: normal
status: open
title: Incorrect error messages for invalid whitespaces in f-string 
subexpressions
type: behavior
versions: Python 3.6, Python 3.7

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[issue30529] Incorrect error messages for invalid whitespaces in f-string subexpressions

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
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[issue30529] Incorrect error messages for invalid whitespaces in f-string subexpressions

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
stage:  -> patch review

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[issue30529] Incorrect error messages for invalid whitespaces in f-string subexpressions

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

PR 1888 makes error messages for f-string subexpressions consistent with error 
messages for expressions out of f-strings, simplifies and speeds up the parsing 
code.

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[issue28791] update sqlite to 3.19.2

[Big Stone]

Changes by Big Stone :


--
title: update sqlite to 3.17.0 -> update sqlite to 3.19.2

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[issue30530] Descriptors HowTo: Example on function.__get__ needs update

[Mariano Anaya]

New submission from Mariano Anaya:

The example on which tries to create a method from the function's __get__ 
doesn't work for Python 3.5+. It would give this error:

TypeError: method expected 2 arguments, got 3

The 3rd parameter, needs to be removed.

--
assignee: docs@python
components: Documentation
messages: 294871
nosy: Mariano Anaya, docs@python
priority: normal
pull_requests: 1967
severity: normal
status: open
title: Descriptors HowTo: Example on function.__get__ needs update
versions: Python 3.5, Python 3.6, Python 3.7

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[issue30531] Windows 10 3.6.1 install disallows pip installs of packages

[Thomas Shinnick]

New submission from Thomas Shinnick:

Installed using python-3.6.1-amd64.exe then tried to pip install a package.  
Repeatedly had to manually intervene to open up permissions on python install 
subdirs, after getting these errors one at a time from pip:
  PermissionError: [WinError 5] Access is denied: 'c:\\program files\\python 
3.6\\Lib\\site-packages\\fontTools'
  PermissionError: [Errno 13] Permission denied: 'c:\\program files\\python 
3.6\\Scripts\\pylupdate5.exe'
  PermissionError: [WinError 5] Access is denied: 'c:\\program files\\python 
3.6\\share'
Gave up and set "full control" on \python 3.6\ dir and contents.

It seems permissions default to "read-only" subdirs which makes pip installs 
impossible.  Install and pip used under same userid and same session.  I 
thought I'd clicked yes to any question "install for all users".

--
components: Installation
messages: 294872
nosy: Thomas Shinnick
priority: normal
severity: normal
status: open
title: Windows 10 3.6.1 install disallows pip installs of packages
type: behavior
versions: Python 3.6

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[issue30531] Windows 10 3.6.1 install disallows pip installs of packages

[Ned Deily]

Changes by Ned Deily :


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

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[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

[Barry Davis]

Barry Davis added the comment:

Looks like I was mistaken. My cross compiler was trying to load libgcc_s.so.1 
from the standard location and not liking the one it found. Fixed for now by 
setting LD_LIBRARY_PATH to point at the dir containing the right libgcc_s.so.1

--
versions:  -Python 3.6

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[issue18748] libgcc_s.so.1 must be installed for pthread_cancel to work

[Barry Davis]

Barry Davis added the comment:

I meant my cross compiled python, not my cross compiler.

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[issue30532] email.policy.SMTP.fold() mangles long headers

[Chris Bradley]

New submission from Chris Bradley:

When email.policy.SMTP.fold() attempts to wrap a line in which a chunk that 
does not contain a space is longer than the maximum line length, two things go 
wrong:
 - The second line does not begin with a space, creating an invalid header.
 - The space before the long chunk is stripped, causing the line break to occur 
in an invalid place.

In the attached test case, email.policy.SMTP.fold() is called on a line of the 
style:
Content-Disposition: attachment; filename=""

 does not contain any spaces and increases in length with each pass. 
Everything works correctly when 'filename=""' fits onto one line. 
However, once it is longer than the maximum line length, the following happens:
 - the space after the semicolon is dropped
 - the line break often splits up the 'filename' keyword
 - the second line loses the initial whitespace

--
files: test_long_mime_headers.py
messages: 294875
nosy: chr...@emergence.com
priority: normal
severity: normal
status: open
title: email.policy.SMTP.fold() mangles long headers
versions: Python 3.5
Added file: http://bugs.python.org/file46917/test_long_mime_headers.py

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[issue30530] Descriptors HowTo: Example on function.__get__ needs update

[Mariatta Wijaya]

Changes by Mariatta Wijaya :


--
stage:  -> patch review

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[issue30532] email.policy.SMTP.fold() mangles long headers

[Ned Deily]

Changes by Ned Deily :


--
nosy: +barry, r.david.murray

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[issue30532] email.policy.SMTP.fold() mangles long headers

[Joel Hillacre]

Changes by Joel Hillacre :


--
pull_requests: +1968

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[issue30533] missing feature in inspect module: getmembers_static

[Carl Meyer]

New submission from Carl Meyer:

The inspect module contains a getattr_static() function, for accessing an 
arbitrary attribute on a Python object without risking descriptor or 
__getattr__ code execution. This is useful for introspection tools that don't 
want to trigger any side effects.

The inspect module also contains a getmembers() function, which returns a 
mapping of names to values for all the object's members. This function could 
also be very useful to introspection tools, except that internally it uses 
normal getattr, thus reintroduces the risk of arbitrary code execution.

It would be useful to have an equivalent to getmembers() that is 
descriptor-safe. This could be done either by introducing a new 
getmembers_static(), or possibly by adding a `getattr` optional keyword 
argument to getmembers, that would take a getattr-equivalent callable to use in 
fetching attributes from the object. (The latter option might render some 
internal assumptions of getmembers() incorrect, needs experimentation.)

--
components: Library (Lib)
messages: 294876
nosy: carljm
priority: normal
severity: normal
status: open
title: missing feature in inspect module: getmembers_static
type: enhancement
versions: Python 3.7

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[issue30532] email.policy.SMTP.fold() mangles long headers

[Joel Hillacre]

Joel Hillacre added the comment:

I added a pull request that causes Chris's test to pass. I can confirm that the 
Chris's was not pass for me on master branch.

--
nosy: +jhillacre

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Antoine Pietri]

Antoine Pietri added the comment:

I'm on it.

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Steve Dower]

Steve Dower added the comment:

The initial fix should be easy:

--- a/Lib/pathlib.py
+++ b/Lib/pathlib.py
@@ -329,8 +329,6 @@ class _PosixFlavour(_Flavour):
 if e.errno != EINVAL:
 if strict:
 raise
-else:
-return newpath
 # Not a symlink
 path = newpath

However, the trick is going to be in the tests, which are shared between POSIX 
and Windows - and are apparently passing on Windows right now. I'm not entirely 
sure why that is, but it may not be as simple here as "works on POSIX".

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Steve Dower]

Steve Dower added the comment:

Ah, looks like they require symlinks for the whole test, which means you need 
to be admin when running them on Windows.

Zach - do we have any buildbots running as admin for symlink tests?

--
nosy: +zach.ware

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Roundup Robot]

Changes by Roundup Robot :


--
pull_requests: +1969

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Antoine Pietri]

Antoine Pietri added the comment:

I added a fix for the tests and the code.

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[issue30531] Windows 10 3.6.1 install disallows pip installs of packages

[Eryk Sun]

Eryk Sun added the comment:

You installed Python for all users, which defaults to installing in 
%ProgramFiles% or %ProgramFiles(x86)%. Python's installation directory inherits 
the security of its parent directory, which in this case grants full control 
only to SYSTEM, TrustedInstaller, and Administrators. Standard users are 
granted only read and execute access. Thus if you're logged on as a standard 
user or UAC-restricted administrator, adding and removing packages requires 
running pip from an elevated command prompt (cmd.exe) that's "[r]un as 
administrator".

A per-user installation, on the other hand, defaults to installing in a 
subdirectory of the user's "%LocalAppData%\Programs" directory, for which the 
user should have full control.

In either case you can change the default installation directory. In general, I 
wouldn't recommend installing for all users to an untrusted location, but 
you're of course free to do that if you want.

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

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[issue30531] Windows 10 3.6.1 install disallows pip installs of packages

[Steve Dower]

Steve Dower added the comment:

You can try installing with "--user" to install to a per-user directory, start 
running pip from an administrative command/PowerShell prompt, or use the venv 
module to create a virtual environment.

Alternatively, if you select the default installation options you will get one 
that you can modify freely, but because it's in your user directory nobody else 
on the machine can use it.

Installing to Program Files is supposed to be read only. You're welcome to open 
it up, just be aware that it is a security risk to do so.

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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Cheryl Sabella]

Cheryl Sabella added the comment:

*bump*

The PR was approved by R. David Murray a while ago.  I can backport once it's 
merged.

Thanks!

--
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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Mariatta Wijaya]

Mariatta Wijaya added the comment:


New changeset 56ddfd2eea4d98456a9a99bf2a718f21ee6b2be2 by Mariatta (csabella) 
in branch 'master':
bpo-27618: Clarify that threading.Lock is a factory function (GH-1307)
https://github.com/python/cpython/commit/56ddfd2eea4d98456a9a99bf2a718f21ee6b2be2


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nosy: +Mariatta

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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Thanks for the PR Cheryl. 

You can backport using cherry_picker.py 
Note that there's a recent update to it: 
https://github.com/python/core-workflow/tree/master/cherry_picker

--
stage: patch review -> backport needed

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Eryk Sun]

Eryk Sun added the comment:

> Ah, looks like they require symlinks for the whole test, 
> which means you need to be admin when running them on Windows.

The privilege to create symlinks isn't filtered out of a standard user's token. 
Are there any buildbots already running as a standard user? In that case it may 
be simpler to modify the user's rights via secpol.msc: Local Policies -> User 
Rights Assignment -> Create symbolic links.

Support could also be added for the new feature in Windows 10 to allow 
unprivileged creation of symlinks when the system is in developer mode and the 
flag SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE [1] is used. A keyword-only 
option to use this flag could be backported to 3.6 and enabled by default in 
3.7.

[1]: https://blogs.windows.com/buildingapps/2016/12/02/symlinks-windows-10

--
nosy: +eryksun

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[issue30177] pathlib.resolve(strict=False) only includes first child

[Zachary Ware]

Zachary Ware added the comment:

> do we have any buildbots running as admin for symlink tests?

No, as far as I know.  I just took Eryk's suggestion and gave the buildslave 
user on my Windows 8.1 bot rights to create symbolic links, though.  It's now 
rebooting after updates, we'll see how it does shortly.

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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Cheryl Sabella]

Changes by Cheryl Sabella :


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pull_requests: +1972

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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Cheryl Sabella]

Changes by Cheryl Sabella :


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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Cheryl Sabella]

Cheryl Sabella added the comment:

Thanks, Mariatta.  I've backported to 3.5 and 3.6 with the new cherry_picker 
instructions.

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[issue30145] Create a How to or Tutorial documentation for asyncio

[Eric Appelt]

Eric Appelt added the comment:

> 2b - I propose to take a simple protocol like Memcache or 
> Redis and simply implement it using the streams API.  We’ll only
> need two methods: set and get; and in the end we’ll teach the user
> how things really work and how to design async APIs.

I decided to make myself a test subject for this idea using Redis since 
although I use Redis a lot at work I've never looked at the underlying Redis 
protocol. I also haven't used the streams API in a long time, and never for 
anything other than simple exploration.

I worked on this the other night and found the Redis protocol simple enough to 
understand and was able to write a simple and somewhat clumsy client the other 
night with a bit of work: 
https://gist.github.com/appeltel/09d77eb489494ae1e2703933108cb60a

One thing that might be good about the Redis protocol for this purpose is that 
the parsing isn't completely trivial but it isn't overly complex either. For 
example, a response string can be given in either the simple format, which 
begins with a "+" byte and then terminates with "\r\n", or it can be in a 
binary safe format where a token of the form "$123\r\n" is sent first, 
signaling that the next 123 bytes are the result to be followed by another 
"\r\n" termination. There is also the sentinel value "$-1\r\n" which may signal 
an unset key. Thus the string "foo" might be sent as "+foo\r\n" or 
"$3\r\nfoo\r\n".

So I think this can be reasonably described in a few brief paragraphs and it is 
much more interesting (to me) than an echo client/server example.

The tutorial should probably also include a link to a rudimentary server 
implementation of an in-memory key/value store implementing the Redis protocol 
and supporting just GET and SET, as the reader may not be able to easily stand 
up Redis for a variety of reasons or lack of knowledge.

I can experiment with memcached as well but I think this proposal is a good 
idea and would work well with Redis.

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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Mariatta Wijaya]

Mariatta Wijaya added the comment:


New changeset 958e815fe014e9a3c64f3568b883c2a7b32a4e2e by Mariatta (csabella) 
in branch '3.5':
bpo-27618: Clarify that threading.Lock is a factory function (GH-1307) (GH-1895)
https://github.com/python/cpython/commit/958e815fe014e9a3c64f3568b883c2a7b32a4e2e


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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Mariatta Wijaya]

Mariatta Wijaya added the comment:


New changeset 9abd0bf68f73b3beb56954e22740f0efcf04bc79 by Mariatta (csabella) 
in branch '3.6':
bpo-27618: Clarify that threading.Lock is a factory function (GH-1307) (GH-1894)
https://github.com/python/cpython/commit/9abd0bf68f73b3beb56954e22740f0efcf04bc79


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[issue27618] docs for threading.Lock claim it's a class (since 3.3), but it's not (and has never been, apparently)

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Thanks :)

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resolution:  -> fixed
stage: backport needed -> resolved
status: open -> closed
versions:  -Python 2.7

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[issue30145] Create a How to or Tutorial documentation for asyncio

[Yury Selivanov]

Yury Selivanov added the comment:

I've created a repo for discussing and making next version of asyncio docs: 
https://github.com/asyncio-docs/cpython-aiodocs. Feel free to join!

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[issue30145] Create a How to or Tutorial documentation for asyncio

[Yury Selivanov]

Yury Selivanov added the comment:

I propose to start using the issues [1] as there are so many topics we'll have 
to discuss.  Feel free to create new issue for whatever idea you have!

[1] https://github.com/asyncio-docs/cpython-aiodocs/issues

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[issue30499] Deprecated note in set documentation

[Mariatta Wijaya]

Changes by Mariatta Wijaya :


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stage:  -> patch review
versions: +Python 3.7

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[issue30145] Create a How to or Tutorial documentation for asyncio

[Yury Selivanov]

Yury Selivanov added the comment:

> I can experiment with memcached as well but I think this proposal is a good 
> idea and would work well with Redis.

I like it! Let's use Redis as an example. Please open an issue at asyncio-docs 
to discuss the details.

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[issue22702] to improve documentation for join() (str method)

[Mariatta Wijaya]

Changes by Mariatta Wijaya :


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stage: resolved -> backport needed
versions: +Python 3.6, Python 3.7 -Python 3.4

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