[issue23434] support encoded filename in Content-Disposition for HTTP in cgi.FieldStorage

[R. David Murray]

R. David Murray  added the comment:

I haven't read the http rfcs, but my understanding is that they follow the MIME 
standards, and the email library already has code to do proper parsing and 
decoding of encoded filenames in Content-Disposition headers.  It should be 
possible to call that code for this use case (the http libraries already depend 
on the email libraries, although I'm not sure if cgi itself does currently).  
There may be additional considerations involved in fully supporting the http 
RFCs, but to determine that someone will need to read both and understand them, 
which is not a small undertaking :)

In the meantime, I'm pretty sure that using the existing mime header parsing 
code in the email library (see email.headerregistry) will provide better 
parsing than the only-handles-simple-cases heuristic in your PR.  Granted, I 
don't think you have to deal with multi-part headers in http, but I vaguely 
remember that there are other subtleties not handled by a simple split on '.

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[issue33125] Windows 10 ARM64 platform support

[Steven Noonan]

Steven Noonan  added the comment:

Oh, another change I had to make was remove all the BaseAddress elements in the 
Link sections. The linker complains if these are used (the lower 4GB of memory 
are apparently reserved for the x86 emulation). Also, from what I was told by 
someone over at Microsoft, the BaseAddress options don't do anything useful on 
modern Windows versions unless you build with -fixed as well, because 
everything gets relocated anyway.

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[issue33125] Windows 10 ARM64 platform support

[Steven Noonan]

New submission from Steven Noonan :

The Windows 10 ARM64 release is out along with a bunch of ARM64 devices. This 
version of Windows has full support for building native Win32 applications 
(this isn't just some rehash of Windows RT). It also can run x86 (but not 
x86_64) apps under a transparent emulation layer.

I would like to see a native build of Python on Windows 10 ARM64.

I did some very basic work to get it compiling (add 10.0.16299.0 as 
DefaultWindowsSDKVersion, add WindowsSDKDesktopARM64Support property). But 
there's still a lot missing: ssl, tk, and ctypes don't build.

ssl/ctypes have some assembly that needs writing/porting.

tk has some kind of build failure with the newer Windows SDK: 
https://core.tcl.tk/tk/tktview?name=3d34589aa0

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components: Windows
messages: 314295
nosy: Steven Noonan, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Windows 10 ARM64 platform support
type: enhancement
versions: Python 3.6

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[issue27212] Doc for itertools, 'islice()' implementation have unwanted behavior for recipe 'consume()'

[Cheryl Sabella]

Change by Cheryl Sabella :


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[issue33119] python sys.argv argument parsing not clear

[Brett Cannon]

Change by Brett Cannon :


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[issue33124] Lazy execution of module bytecode

[Brett Cannon]

Change by Brett Cannon :


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[issue33124] Lazy execution of module bytecode

[Barry A. Warsaw]

Change by Barry A. Warsaw :


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[issue33124] Lazy execution of module bytecode

[Neil Schemenauer]

Change by Neil Schemenauer :


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[issue33124] Lazy execution of module bytecode

[Neil Schemenauer]

New submission from Neil Schemenauer :

This is an experimental patch that implements lazy execution of top-level 
definitions in modules (functions, classes, imports, global constants).  See 
Tools/lazy_compile/README.txt for details.

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nosy: nascheme
priority: low
severity: normal
stage: patch review
status: open
title: Lazy execution of module bytecode
type: enhancement

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[issue32505] dataclasses: make field() with no annotation an error

[Eric V. Smith]

Change by Eric V. Smith :


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[issue32505] dataclasses: make field() with no annotation an error

[miss-islington]

miss-islington  added the comment:


New changeset 3b4c6b16c597aa2356f5658dd67da7dcd4434038 by Miss Islington (bot) 
in branch '3.7':
bpo-32505: dataclasses: raise TypeError if a member variable is of type Field, 
but doesn't have a type annotation. (GH-6192)
https://github.com/python/cpython/commit/3b4c6b16c597aa2356f5658dd67da7dcd4434038


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[issue30071] Duck-typing inspect.isfunction()

[Jeroen Demeyer]

Jeroen Demeyer  added the comment:

See https://mail.python.org/pipermail/python-ideas/2018-March/049398.html

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[issue30953] Fatal python error when jumping into except clause

[ppperry]

ppperry  added the comment:

... with a bad error message, because there are no finally blocks in the code

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[issue32505] dataclasses: make field() with no annotation an error

[Eric V. Smith]

Eric V. Smith  added the comment:


New changeset 56970b8ce9d23269d20a76f13c80e670c856ba7f by Eric V. Smith in 
branch 'master':
bpo-32505: dataclasses: raise TypeError if a member variable is of type Field, 
but doesn't have a type annotation. (GH-6192)
https://github.com/python/cpython/commit/56970b8ce9d23269d20a76f13c80e670c856ba7f


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[issue32505] dataclasses: make field() with no annotation an error

[miss-islington]

Change by miss-islington :


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[issue6083] Reference counting bug in PyArg_ParseTuple and PyArg_ParseTupleAndKeywords

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

LGTM.

> What should I write instead of _?

(ValueError, OSError)

> And will the next call be effective (do anything), if we have already set the 
> limit with the testing call?

This doesn't matter. We test that it doesn't crash when parse arguments.

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[issue32505] dataclasses: make field() with no annotation an error

[Eric V. Smith]

Change by Eric V. Smith :


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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Yury Selivanov]

Yury Selivanov  added the comment:

> I suppose that it would also be difficult to get buy-in for a feature like 
> this from the different frameworks?

Maybe :)  Ideally, asyncio programs should not depend on how exactly tasks are 
scheduled.

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[issue6083] Reference counting bug in PyArg_ParseTuple and PyArg_ParseTupleAndKeywords

[Ivan Zakharyaschev]

Ivan Zakharyaschev  added the comment:

And will the next call be effective (do anything), if we have already set the 
limit with the testing call?

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[issue6083] Reference counting bug in PyArg_ParseTuple and PyArg_ParseTupleAndKeywords

[Ivan Zakharyaschev]

Ivan Zakharyaschev  added the comment:

Thanks! I also thought about this simplest way. What about this:

diff --git a/Python/Lib/test/test_resource.py b/Python/Lib/test/test_resource.py
index de29d3b..bec4440 100644
--- a/Python/Lib/test/test_resource.py
+++ b/Python/Lib/test/test_resource.py
@@ -102,16 +102,21 @@ class ResourceTest(unittest.TestCase):
 
 # Issue 6083: Reference counting bug
 def test_setrusage_refcount(self):
+howmany = 100
 try:
 limits = resource.getrlimit(resource.RLIMIT_CPU)
 except AttributeError:
 self.skipTest('RLIMIT_CPU not available')
+try:
+resource.setrlimit(resource.RLIMIT_CPU, (howmany, howmany))
+except _:
+self.skipTest('Setting RLIMIT_CPU not possible')
 class BadSequence:
 def __len__(self):
 return 2
 def __getitem__(self, key):
 if key in (0, 1):
-return len(tuple(range(100)))
+return len(tuple(range(howmany)))
 raise IndexError
 
 resource.setrlimit(resource.RLIMIT_CPU, BadSequence())

What should I write instead of _?

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[issue6083] Reference counting bug in PyArg_ParseTuple and PyArg_ParseTupleAndKeywords

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

The simplest way is to try passing the limit as a tuple

resource.setrlimit(resource.RLIMIT_CPU, (100, 100))

and skip the test if it failed.

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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Vitaly Kruglikov]

Vitaly Kruglikov  added the comment:

Yet another paradigm is the likes of `GSource` in gnome's glib. GSource "tasks" 
added to the event loop are polled by the event loop for readiness before the 
event loop blocks on select/epoll/etc.. The ones that are ready are removed 
from the loop and their callbacks are dispatched.

I suppose that it would also be difficult to get buy-in for a feature like this 
from the different frameworks?

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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Vitaly Kruglikov]

Vitaly Kruglikov  added the comment:

I'll have to settle for `set_write_buffer_limits(0, 0)` for my blocking wrapper 
case.

I think that 'write_buffer_drained' callback is a good idea, though.

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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Vitaly Kruglikov]

Vitaly Kruglikov  added the comment:

> 'events.AbstractEventLoop.run_one_step()'

> This is highly unlikely to ever happen.

Sure, I can see how that could be a problem with other underlying 
implementations, such as Twisted reactor. Just wishful thinking :).

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[issue33115] Asyncio loop blocks with a lot of parallel tasks

[Yury Selivanov]

Yury Selivanov  added the comment:

> Does this mean that GC uses most part of CPU time so the loop blocks?

GC stops all Python code in the OS process from running.  Because of the GIL 
code in threads will obviously be stopped too.  This is true for both CPython 
and PyPy at this moment.

> And another question: do you have any plans to optimize the loop so it would 
> be possible to run really lot of tasks in parallel?

The only way of doing this is to have a few asyncio OS processes (because of 
the GIL we can't implement M:N scheduling in a single Python process).  So it's 
not going to happen in the foreseeable future :(

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[issue33123] Path.unlink should have a missing_ok parameter

[Roundup Robot]

Change by Roundup Robot :


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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Yury Selivanov]

Yury Selivanov  added the comment:

> 'events.AbstractEventLoop.run_one_step()'

This is highly unlikely to ever happen.  It's hard to define what one iteration 
of an event loop is, and it would be even harder to get that agreement for all 
frameworks/event loops that are compatible with or based on asyncio.

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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Yury Selivanov]

Yury Selivanov  added the comment:

Yeah, I think your best option would be to use `set_write_buffer_limits(0, 0)`. 
 You don't need asyncio flow control anyways, as AMQP protocol is unlikely to 
generate any pressure on IO buffers.

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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Vitaly Kruglikov]

Vitaly Kruglikov  added the comment:

... or `events.AbstractEventLoop.run_one_iteration()`.

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[issue33123] Path.unlink should have a missing_ok parameter

[rbu]

New submission from rbu :

Similarly to how several pathlib file creation functions have an "exists_ok" 
parameter, we should introduce "missing_ok" that makes removal functions not 
raise an exception when a file or directory is already absent.

IMHO, this should cover Path.unlink and Path.rmdir.

Note, Path.resolve() has a "strict" parameter since 3.6 that does the same 
thing. Naming this of this new parameter tries to be consistent with the 
"exists_ok" parameter as that is more explicit about what it does (as opposed 
to "strict").

--
components: Library (Lib)
messages: 314277
nosy: rbu
priority: normal
severity: normal
status: open
title: Path.unlink should have a missing_ok parameter
type: enhancement
versions: Python 3.8

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[issue33053] Avoid adding an empty directory to sys.path when running a module with `-m`

[Brett Cannon]

Brett Cannon  added the comment:

I can't make any promises unfortunately.

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[issue33115] Asyncio loop blocks with a lot of parallel tasks

[Marat Sharafutdinov]

Marat Sharafutdinov  added the comment:

Does this mean that GC uses most part of CPU time so the loop blocks?

And another question: do you have any plans to optimize the loop so it would be 
possible to run really lot of tasks in parallel?

Thanks.

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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Vitaly Kruglikov]

Vitaly Kruglikov  added the comment:

Thank you for following up. My use case is this:

In the Pika AMQP client package, we have a blocking AMQP connection adapter - 
`BlockingConnection` - wrapped around an asynchronous AMQP connection adapter. 
Presently, BlockingConnection is wrapped around the asynchronous 
`SelectConnection` which has a home-grown proprietary IOLoop. I would like to 
switch BlockingConnection to use an asyncio-based adapter when running on 
Python3.

SelectConnection's proprietary IOLoop provides a single-stepping run function 
(poll with a timeout as normally determined by pending callbacks, timers, etc., 
process all ready events/timers/callbacks, and return). When BlockingConnection 
needs to send something to the AMQP broker and/or wait for an expected reply, 
it sends the request (which typically gets queued up in a write buffer) and 
then runs the proprietary IOLoop's single-stepping method in a loop (thus 
blocking efficiently on I/O); each time after the single-stepping IOLoop method 
returns, BlockingConnection checks whether the conditions of interest have been 
satisfied (e.g., the write buffer size being zero and AMQP Channel.OpenOk has 
been received).

So, another way that asyncio could help, and certainly simplest for me and my 
use case, is by providing a single-stepping function in the event loop 
implementations, such as the single-stepping method that I described at the top 
of the previous paragraph. E.g., `events.AbstractEventLoop.run_one_step()`.

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[issue6083] Reference counting bug in PyArg_ParseTuple and PyArg_ParseTupleAndKeywords

[Ivan Zakharyaschev]

Ivan Zakharyaschev  added the comment:

>>> import resource
>>> resource.getrlimit(resource.RLIMIT_CPU) 
(7200, 7260)

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[issue30953] Fatal python error when jumping into except clause

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

This is fixed in 3.8.

Traceback (most recent call last):
  File "issue30953.py", line 15, in 
error()
  File "issue30953.py", line 14, in error
pass
  File "issue30953.py", line 14, in error
pass
  File "issue30953.py", line 4, in trace
frame.f_lineno = 12
ValueError: can't jump into or out of a 'finally' block

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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Yury Selivanov]

Yury Selivanov  added the comment:

We'll likely add 'write_buffer_drained' callback method to `asyncio.Protocol` 
in 3.8.  In the meanwhile, the only option would be using `_make_empty_waiter` 
in 3.7, or set_write_buffer_limits(0, 0).

What's your use case, by the way?

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[issue33120] infinite loop in inspect.unwrap(unittest.mock.call)

[Peter]

Peter  added the comment:

I see two options to fix it:

1) add recursion depth check to inspect.wrap
2) define __wrapped__ on mock._Call so it won't go into recursion.

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[issue27212] Doc for itertools, 'islice()' implementation have unwanted behavior for recipe 'consume()'

[Cheryl Sabella]

Cheryl Sabella  added the comment:

Thanks, Raymond.  I'll take a look.

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[issue6083] Reference counting bug in PyArg_ParseTuple and PyArg_ParseTupleAndKeywords

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

What does resource.getrlimit(resource.RLIMIT_CPU) return?

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[issue33082] multiprocessing docs bury very important 'callback=' args

[Chad]

Chad  added the comment:

On topic: My CLA is signed as of Monday, 19 March. My status here is not 
updated yet.


pitrou, off-topic: Without callbacks, users who want multiprocessing functions 
to return something, not just mutate state somewhere else, must gather jobs in 
a list and continually iterate through them polling to see if each has finished 
yet and conditionally popping it from the list. It's expensive and ugly and 
error-prone. Callbacks are really great, you should try them again.

So much better:

pool.apply_async(func, args, callback=when_finished_call_with_result)

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[issue33027] handling filename encoding in Content-Disposition by cgi.FieldStorage

[Paweł]

Paweł  added the comment:

duplicate of https://bugs.python.org/issue23434

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[issue23434] support encoded filename in Content-Disposition for HTTP in cgi.FieldStorage

[Paweł]

Paweł  added the comment:

I didn't find this and created a duplicate
https://bugs.python.org/issue33027

I've added similar/updated changes
https://github.com/python/cpython/pull/6027

@r.david.murray wouldn't it be wise to do one step at a time rather than 
implementing full support for RFC6266? Please tell exactly what is your 
expectations so I can fix the patch if it needs to be fixed.

This is also related to RFC5987
https://tools.ietf.org/html/rfc5987
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition

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pull_requests: +5937
stage:  -> patch review
title: RFC6266 support (Content-Disposition for HTTP) -> support encoded 
filename in Content-Disposition for HTTP in cgi.FieldStorage
versions: +Python 2.7, Python 3.4, Python 3.5, Python 3.7, Python 3.8

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[issue6083] Reference counting bug in PyArg_ParseTuple and PyArg_ParseTupleAndKeywords

[Ivan Zakharyaschev]

Ivan Zakharyaschev  added the comment:

> New changeset a4c85f9b8f58 by Serhiy Storchaka in branch '2.7':
Issue #6083: Fix multiple segmentation faults occured when PyArg_ParseTuple
http://hg.python.org/cpython/rev/a4c85f9b8f58

This test has a problem: though it tests not the ability to set a CPU hard 
limit, it fails if the hard limit is limited. Perhaps, ignore any exception 
there? Could you please help me re-write it correctly, so that I can run it on 
gyle--ALT's builder host--successfully):

# Issue 6083: Reference counting bug
def test_setrusage_refcount(self):
try:
limits = resource.getrlimit(resource.RLIMIT_CPU)
except AttributeError:
self.skipTest('RLIMIT_CPU not available')
class BadSequence:
def __len__(self):
return 2
def __getitem__(self, key):
if key in (0, 1):
return len(tuple(range(100)))
raise IndexError

resource.setrlimit(resource.RLIMIT_CPU, BadSequence())

The failure:

[builder@team ~]$ python /usr/lib64/python2.7/test/test_resource.py
test_args (__main__.ResourceTest) ... ok
test_fsize_enforced (__main__.ResourceTest) ... ok
test_fsize_ismax (__main__.ResourceTest) ... ok
test_fsize_toobig (__main__.ResourceTest) ... ok
test_getrusage (__main__.ResourceTest) ... ok
test_setrusage_refcount (__main__.ResourceTest) ... ERROR

==
ERROR: test_setrusage_refcount (__main__.ResourceTest)
--
Traceback (most recent call last):
  File "/usr/lib64/python2.7/test/test_resource.py", line 117, in 
test_setrusage_refcount
resource.setrlimit(resource.RLIMIT_CPU, BadSequence())
ValueError: not allowed to raise maximum limit

--
Ran 6 tests in 0.085s

FAILED (errors=1)
Traceback (most recent call last):
  File "/usr/lib64/python2.7/test/test_resource.py", line 123, in 
test_main()
  File "/usr/lib64/python2.7/test/test_resource.py", line 120, in test_main
test_support.run_unittest(ResourceTest)
  File "/usr/lib64/python2.7/test/support/__init__.py", line 1577, in 
run_unittest
_run_suite(suite)
  File "/usr/lib64/python2.7/test/support/__init__.py", line 1542, in _run_suite
raise TestFailed(err)
test.support.TestFailed: Traceback (most recent call last):
  File "/usr/lib64/python2.7/test/test_resource.py", line 117, in 
test_setrusage_refcount
resource.setrlimit(resource.RLIMIT_CPU, BadSequence())
ValueError: not allowed to raise maximum limit

[builder@team ~]$

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[issue32505] dataclasses: make field() with no annotation an error

[Eric V. Smith]

Eric V. Smith  added the comment:

Thanks for the offer. I've already got the code written, I just need to write 
some tests. I'll get it done real soon now.

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versions: +Python 3.8

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[issue30416] constant folding opens compiler to quadratic time hashing

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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versions: +Python 2.7 -Python 3.7

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[issue33053] Avoid adding an empty directory to sys.path when running a module with `-m`

[Ned Deily]

Change by Ned Deily :


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[issue19979] Missing nested scope vars in class scope (bis)

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

This looks like a duplicate of issue9226.

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[issue33122] ftplib: FTP_TLS seems to have problems with sites that close the encrypted channel themselfes

[Jürgen]

New submission from Jürgen :

Hi,

I'm not quite sure, if you would actually call this a bug, but it is very 
molesting at least ;o)

I use ftplib.FTP_TLS to connect to a z/OS ftp server. With a minor change it 
works very well (happy to have found this library).
The problem I have is, that without any change, an exception is raised after 
every single command I invoke, even though the server sends back an ok message.

The exception is an OSError which is raised while executing conn.unwrap(). It 
seems the connection is already closed when this is called and thus an 
exception is raised. But handling this exception outside the FTP_TLS-class 
makes no sense, because then every command would raise an exception and the 
"good" exceptions could not be distinguised from the ones that are really 
searious so easily anymore (I mean: if i get an exception that a connection 
could not be closed, because someone else closed it before, that's not very 
serious, is it?).

Suggestions to solve this:
small solution: allow the programmer to decide what to do, by creating 
subclasses
This is "factor-out" the unwrap logic in a separate method or function, so at 
least users of the class can overwrite the behavior, without having to rebuild 
the whole logic of the affected methods.

In my quick solution I created a new method in class FTP:
def __handleAutoCloseSSL__(self, conn):
if self.autoCloseModeSSL == 'NONE' or self.autoCloseModeSSL is None or 
_SSLSocket is None or not isinstance(conn, _SSLSocket):
# do nothing
pass
elif self.autoCloseModeSSL in ('SAFE', 'HIDE'):
try:
conn.unwrap()
except OSError as ex:
if self.autoCloseModeSSL != 'HIDE':
print('Caught exception %s while calling conn.unwrap()' % 
str(ex))
else:
# Standard mode (usally self.autoCloseModeSSL =='STANDARD' but 
anything else is accepted as well)
# the original code was:
#if _SSLSocket is not None and isinstance(conn, _SSLSocket):
#conn.unwrap()
conn.unwrap()

And the class variable:
autoCloseModeSSL = 'STANDARD'

Then I called it from methods (instead of doing conn.unwrap() there directly):
retbinary
retlines
storbinary
storlines

Ok, maybe not that sexy, but it works :o)
And if you don't like the hack with instance variable autoCloseModeSSL, you 
could just transfer the original conn.unwrap() in an extra method which could 
then be overwritten by programmers in subclasses. This would already help me 
very much, because I know that patching a library is not a good idea. Even more 
if it is a communication library that might be updated from time to time.

--
components: Library (Lib)
messages: 314261
nosy: jottbe
priority: normal
severity: normal
status: open
title: ftplib: FTP_TLS seems to have problems with sites that close the 
encrypted channel themselfes
type: behavior
versions: Python 3.6

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[issue33121] recv returning 0 on closed connection not documented

[joders]

New submission from joders :

The "Linux Programmer's Manual" states:

When a stream socket peer has performed an orderly shutdown, the return value 
will be 0 (the traditional "end-of-file" return).

I find that information pretty important which is why I am asking if you might 
want to add it to the python documentation as well. It would have prevented a 
bug in my code.

--
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components: Documentation
messages: 314260
nosy: docs@python, joders
priority: normal
severity: normal
status: open
title: recv returning 0 on closed connection not documented
type: enhancement
versions: Python 3.6

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[issue32505] dataclasses: make field() with no annotation an error

[Ivan Levkivskyi]

Ivan Levkivskyi  added the comment:

> you'll notice that's an error?

Yes, but there are other scenarios, like using `init=False` or updating 
existing class definition and forgetting to update call sites (which will still 
work), etc.

What would we lose by not flagging this as an error? I think there are no 
legitimate use cases for such code, and implementation is straightforward. If 
you don't have time I can do this myself.

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[issue17861] put opcode information in one place

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Currently an explicit `make regen-opcode` and `make regen-opcode-targets` (or 
just `make regen-all`) are needed for regenerating C files from opcode.py.

Is anything left to do in this issue?

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[issue33018] Improve issubclass() error checking and message

[Ivan Levkivskyi]

Ivan Levkivskyi  added the comment:

I am closing this for now. We can re-open it later if problems will appear in 
3.7.

--
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status: open -> closed

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[issue32999] issubclass(obj, abc.ABC) causes a segfault

[Ivan Levkivskyi]

Ivan Levkivskyi  added the comment:


New changeset 5d8bb5d07be2a9205e7059090f0ac5360d36b217 by Ivan Levkivskyi (Miss 
Islington (bot)) in branch '3.7':
bpo-32999: Revert GH-6002 (fc7df0e6) (GH-6189) (GH-6190)
https://github.com/python/cpython/commit/5d8bb5d07be2a9205e7059090f0ac5360d36b217


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[issue33018] Improve issubclass() error checking and message

[Ivan Levkivskyi]

Ivan Levkivskyi  added the comment:


New changeset 5d8bb5d07be2a9205e7059090f0ac5360d36b217 by Ivan Levkivskyi (Miss 
Islington (bot)) in branch '3.7':
bpo-32999: Revert GH-6002 (fc7df0e6) (GH-6189) (GH-6190)
https://github.com/python/cpython/commit/5d8bb5d07be2a9205e7059090f0ac5360d36b217


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[issue33120] infinite loop in inspect.unwrap(unittest.mock.call)

[Peter]

New submission from Peter :

The following module will eat all available RAM if executed:

import inspect
import unittest.mock
print(inspect.unwrap(unittest.mock.call))

inspect.unwrap has loop protection against functions that wrap themselves, but 
unittest.mock.call creates new object on demand.

--
components: Library (Lib)
messages: 314254
nosy: peterdemin
priority: normal
severity: normal
status: open
title: infinite loop in inspect.unwrap(unittest.mock.call)
type: crash
versions: Python 3.6

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[issue32234] Add context management to mailbox.Mailbox

[Cheryl Sabella]

Cheryl Sabella  added the comment:

It looks like Barry was ready to merge this PR in December.  Is there anything 
else that needs to be done for it?  Thanks!

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[issue33053] Avoid adding an empty directory to sys.path when running a module with `-m`

[Viv]

Viv  added the comment:

Thanks, worked a treat https://www.allcarleasing.co.uk/special-offers/

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[issue32999] issubclass(obj, abc.ABC) causes a segfault

[miss-islington]

Change by miss-islington :


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[issue33018] Improve issubclass() error checking and message

[miss-islington]

Change by miss-islington :


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[issue33018] Improve issubclass() error checking and message

[INADA Naoki]

INADA Naoki  added the comment:


New changeset f757b72b2524ce3451d2269f0b8a9f0593a7b27f by INADA Naoki in branch 
'master':
bpo-32999: Revert GH-6002 (fc7df0e6) (GH-6189)
https://github.com/python/cpython/commit/f757b72b2524ce3451d2269f0b8a9f0593a7b27f


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[issue32999] issubclass(obj, abc.ABC) causes a segfault

[INADA Naoki]

INADA Naoki  added the comment:


New changeset f757b72b2524ce3451d2269f0b8a9f0593a7b27f by INADA Naoki in branch 
'master':
bpo-32999: Revert GH-6002 (fc7df0e6) (GH-6189)
https://github.com/python/cpython/commit/f757b72b2524ce3451d2269f0b8a9f0593a7b27f


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[issue23203] Aliasing import of sub-{module, package} from the package raises AttributeError on import.

[Nick Coghlan]

Nick Coghlan  added the comment:

Heh, apparently I forgot how IMPORT_FROM currently works some time between 2015 
and 2017 :)

I agree this is out of date now, as the requested behaviour was already 
implemented for 3.7

--
resolution:  -> out of date
stage:  -> resolved
status: open -> closed
superseder:  -> Treat `import a.b.c as m` as `m = sys.modules['a.b.c']`

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[issue33053] Avoid adding an empty directory to sys.path when running a module with `-m`

[Nick Coghlan]

Nick Coghlan  added the comment:

Brett or Eric, any chance one of you could run with this for 3.7b3? I already 
have a startup refactoring related regression that I'm aiming to have fixed 
before then.

Thanks to Victor's refactoring work, there's at least a clear interception 
point now where we can treat the empty string differently depending on whether 
the command line option was `-c`, `-m`, or not specified at all: 
https://github.com/python/cpython/blob/master/Python/pathconfig.c#L259

As an initial attempt, I think the necessary fix will be along the lines of 
checking for 'n == 0 && argc > 1 && wcscmp(argv0, L"-m") == 0', and resolving 
the current working directory in that case.

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[issue32999] issubclass(obj, abc.ABC) causes a segfault

[INADA Naoki]

Change by INADA Naoki :


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[issue33018] Improve issubclass() error checking and message

[INADA Naoki]

Change by INADA Naoki :


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[issue33018] Improve issubclass() error checking and message

[miss-islington]

miss-islington  added the comment:


New changeset 346964ba0586e402610ea886e70bee1294874781 by Miss Islington (bot) 
in branch '3.7':
bpo-33018: Improve issubclass() error checking and message. (GH-5944)
https://github.com/python/cpython/commit/346964ba0586e402610ea886e70bee1294874781


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[issue33018] Improve issubclass() error checking and message

[miss-islington]

Change by miss-islington :


--
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pull_requests: +5932
stage:  -> patch review

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[issue33018] Improve issubclass() error checking and message

[Ivan Levkivskyi]

Ivan Levkivskyi  added the comment:


New changeset 40472dd42de4f7265d456458cd13ad6894d736db by Ivan Levkivskyi (jab) 
in branch 'master':
bpo-33018: Improve issubclass() error checking and message. (GH-5944)
https://github.com/python/cpython/commit/40472dd42de4f7265d456458cd13ad6894d736db


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[issue23203] Aliasing import of sub-{module, package} from the package raises AttributeError on import.

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Is anything left to do with this issue after issue30024?

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[issue30076] Opcode names BUILD_MAP_UNPACK_WITH_CALL and BUILD_TUPLE_UNPACK_WITH_CALL are too long

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
assignee:  -> docs@python
components: +Documentation
nosy: +docs@python
stage:  -> needs patch
versions: +Python 3.6, Python 3.8

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[issue32838] Fix Python versions in the table of magic numbers

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
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status: open -> closed

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[issue25828] PyCode_Optimize() (peephole optimizer) doesn't handle KeyboardInterrupt correctly

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

I can reproduce a crash in 3.5, but not in 3.6. Seems it was fixed in 
issue30416.

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[issue24565] the f_lineno getter is broken

[Xavier de Gaye]

Xavier de Gaye  added the comment:

I will work on it shortly.

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[issue25782] CPython hangs on error __context__ set to the error itself

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

What should we do with this issue? Does it need opening a topic on Python-Dev?

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[issue28962] Crash when throwing an exception with a malicious __hash__ override

[Serhiy Storchaka]

Change by Serhiy Storchaka :


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versions:  -Python 3.3

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[issue28962] Crash when throwing an exception with a malicious __hash__ override

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Seems it was fixed somewhere between 3.6.3 and 3.6.5+.

Traceback (most recent call last):
  File "baderror.py", line 10, in 
raise e from e
__main__.BadError

3.5 is now in security-only fixes stage, and this doesn't look like a security 
issue.

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versions:  -Python 3.4, Python 3.5

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[issue26286] dis module: coroutine opcode documentation clarity

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

(2) is already fixed.

SETUP_ASYNC_WITH talks about the same frame blocks as pushed by SETUP_FINALLY, 
SETUP_EXCEPT, SETUP_LOOP and popped by POP_BLOCK. But unlike to SETUP_FINALLY 
it pushes a frame block pointing below TOS. This detail needs to be documented.

Do you mind to create a pull request Jim?

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[issue33119] python sys.argv argument parsing not clear

[Jonathan Huot]

New submission from Jonathan Huot :

Executing python modules with -m can lead to weird sys.argv parsing.

"Argument parsing" section at 
https://docs.python.org/3.8/tutorial/interpreter.html#argument-passing mention :

- When -m module is used, sys.argv[0] is set to the full name of the located 
module.

The word "located" is used, but it doesn't mention anything when the module is 
not *yet* "located".

For instance, let's see what is the sys.argv for each python files:


$ cat mainmodule/__init__.py
import sys; print("{}: {}".format(sys.argv, __file__))
$ cat mainmodule/submodule/__init__.py
import sys; print("{}: {}".format(sys.argv, __file__))
$ cat mainmodule/submodule/foobar.py
import sys; print("{}: {}".format(sys.argv, __file__))


Then we call "foobar" with -m:

$ python -m mainmodule.submodule.foobar -o -b
['-m', '-o', 'b']: (..)/mainmodule/__init__.py
['-m', '-o', 'b']: (..)/mainmodule/submodule/__init__.py
['(..)/mainmodule/submodule/foobar.py', '-o', 'b']: 
(..)/mainmodule/submodule/foobar.py
$


We notice that only "-m" is in sys.argv before we found "foobar". This can lead 
to a lot of troubles when we have meaningful processing in __init__.py which 
rely on sys.argv to initialize stuff.

IMHO, it either should be the sys.argv intact ['-m', 
'mainmodule.submodule.foobar', '-o', '-b'] or empty ['', '-o', '-b'] or  only 
the latest ['-o', '-b'], but it should not be ['-m', '-o', '-b'] which is very 
confusing.

--
assignee: docs@python
components: Documentation
messages: 314239
nosy: Jonathan Huot, docs@python
priority: normal
severity: normal
status: open
title: python sys.argv argument parsing not clear
type: behavior
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7, Python 3.8

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[issue25836] Documentation of MAKE_FUNCTION/MAKE_CLOSURE_EXTENDED_ARG is misleading

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

MAKE_FUNCTION was changed in 3.6, and its documentation was changed 
accordingly. 3.5 is now in security-only fixes stage.

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stage:  -> resolved
status: open -> closed

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[issue24565] the f_lineno getter is broken

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Could you please convert your patches to a PR Xavier?

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[issue13677] correct docstring for builtin compile

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
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[issue4819] Misc/cheatsheet needs updating

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
status: open -> pending
versions:  -Python 3.2, Python 3.3

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[issue33118] No clean way to get notified when a Transport's write buffer empties out

[Vitaly Kruglikov]

New submission from Vitaly Kruglikov :

There doesn't appear to be an ordained mechanism for getting notified when a 
Transport's (or WriteTransport's) write buffer drains to zero (i.e., all output 
data has been transferred to socket). I don't want to hijack 
`set_write_buffer_limits()` for this purpose, because that would preclude me 
from using it for its intended purpose.

I see that transport in selector_events.py has a private method 
`_make_empty_waiter()`, which is along the lines of what I need, but it's 
private and is used by `BaseSelectorEventLoop._sendfile_native()`.

Just like `BaseSelectorEventLoop._sendfile_native()`, my app needs equivalent 
functionality in order to be able to run the loop (`run_until_complete()`) 
until the transport's write buffer empties out.

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components: asyncio
messages: 314236
nosy: asvetlov, vitaly.krug, yselivanov
priority: normal
severity: normal
status: open
title: No clean way to get notified when a Transport's write buffer empties out
type: enhancement
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8

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[issue27212] Doc for itertools, 'islice()' implementation have unwanted behavior for recipe 'consume()'

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Cheryl, I think you take this one.  It hasn't been touched in a long time and 
Nofar is focused on another issue.

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assignee: Nofar Schnider -> csabella

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[issue33108] Unicode char 304 in lowercase has len = 2

[Serhiy Storchaka]

Serhiy Storchaka  added the comment:

Thank you Ma Lin.

Closed as a duplicate of issue17252.

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nosy: +serhiy.storchaka
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> Latin Capital Letter I with Dot Above

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