[issue40334] PEP 617: new PEG-based parser

[STINNER Victor]

STINNER Victor  added the comment:

I don't see any mention of the PEP 617 in What's New in Python 3.9:
https://docs.python.org/dev/whatsnew/3.9.html

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[issue40334] PEP 617: new PEG-based parser

[Lysandros Nikolaou]

Change by Lysandros Nikolaou :


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[issue39674] Keep deprecated features in Python 3.9 to ease migration from Python 2.7, but remove in Python 3.10

[STINNER Victor]

STINNER Victor  added the comment:

I close this issue.

So far, it seems like the number of incompatible changes in Python 3.9 is 
reasonable. If more incompatible changes should be reverted, I suggest to open 
new issues.

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[issue40334] PEP 617: new PEG-based parser

[Guido van Rossum]

Change by Guido van Rossum :


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[issue40346] Add random.BaseRandom to ease implementation of subclasses

[Tim Peters]

Tim Peters  added the comment:

>> Making it easy to create subclasses was never a goal regardless.

> It's clearly advertised at the beginning of the documentation:
>
> "Class Random can also be subclassed if you want to use a
> different basic generator of your own devising: (...)"
>
> Do you mean that the documentation is wrong and users must
> not subclass random.Random?

I don't know about the docs, but I do know what the goals were whenever I wrote 
the code ;-)  It _can_ be subclassed - but so can be any class whatsoever.  
There was never an intent to make usefully subclass-ing Random easy:  which is 
precisely what you've discovered and are attempting to improve.

Already said that's fine by me, with caveats.  It's not worth much that I can 
see, beyond scratching an "elegance" itch that I don't happen to have in this 
case.  Who subclasses Random in the real world?  Who would want to?  Python 
wanted to in order to add SystemRandom, and did as little as necessary to do so 
usefully.  A long time ago, I believe we also supplied a subclass to give 
results identical to Python's ancient (& long gone) Wichmann-Hill generator.

Those two are the only cases I've heard of (outside of the test suite).

Provided reworking it doesn't break working code or slow things down, I'm +0.

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[issue40150] (minor) mismatched argument in overlapped_RegisterWaitWithQueue call to RegisterWaitForSingleObject

[Zackery Spytz]

Change by Zackery Spytz :


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[issue39983] test.regrtest: test marked as failed (env changed), but no warning: test_multiprocessing_forkserver

[STINNER Victor]

Change by STINNER Victor :


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[issue40370] AIX: ld_so_aix not found during test of test_peg_generator

[Michael Felt]

Michael Felt  added the comment:

Thanks for the quick work. I’ll test with xlc as well, as the builds behave 
differently this afternoon. 

Sent from my iPhone

> On 23 Apr 2020, at 16:31, Pablo Galindo Salgado  
> wrote:
> 
> 
> Pablo Galindo Salgado  added the comment:
> 
> Tested on an AIX system:
> 
> [pablo@ibm_machine cpython (master)]$ uname -a
> AIX ibm_machine 1 7 *** powerpc  AIX
> [pablo@ibm1 cpython (master)]$ ./python -m test test_peg_generator
> 0:00:00 Run tests sequentially
> 0:00:00 [1/1] test_peg_generator
> 
> == Tests result: SUCCESS ==
> 
> 1 test OK.
> 
> Total duration: 5.0 sec
> Tests result: SUCCESS
> 
> I will mark this issue as fixed as It was failing before on this machine and 
> now the test suceeds. Feel free to reopen if is not fixes in your system :)
> 
> --
> resolution:  -> fixed
> stage: patch review -> resolved
> status: open -> closed
> 
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[issue40374] collections.abc docs table: Mapping missing __reversed__

[Dennis Sweeney]

Dennis Sweeney  added the comment:

> `Mapping.__reversed__` exists

While ``'__reversed__' in dir(Mapping)`` is true, that unfortunately does not 
mean that it is a real callable method:


from collections.abc import Mapping
class Map(Mapping):
def __getitem__(self, x):
if x == 42:
return 17
raise KeyError
def __len__(self, x):
return 1
def __iter__(self):
yield 42

>>> m = Map()
>>> reversed(m)
Traceback (most recent call last):
...
TypeError: 'Map' object is not reversible

In the code for Mapping, ``__reversed__`` is explicitly defined as None [1] so 
that calling ``reversed(custom_mapping)`` doesn't accidentally fall back on the 
sequence protocol, which would mean starting at len(custom_mapping)-1 and 
calling __getitem__ on each index [2], which is certainly not desirable for 
arbitrary mappings.

I don't think there is a reasonable way, given arbitrary implementations of 
__len__, __iter__, and __getitem__, to have a mixin reversed iterator.  If 
someone wants their mapping to have a __reversed__ method, they should define 
it themselves.

[1] https://github.com/python/cpython/blob/master/Lib/_collections_abc.py#L707
[2] 
https://docs.python.org/3/reference/datamodel.html?highlight=__reversed__#object.__reversed__

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[issue33065] IDLE debugger: failure stepping through module loading

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Timothy, can you try editing idlelib.debugger_r, line 173, as suggested above 
and see if it solves the problem?

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[issue38546] test_concurrent_futures: reap_children() warnings on RHEL7 and RHEL8 buildbots

[STINNER Victor]

Change by STINNER Victor :


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[issue40217] The garbage collector doesn't take in account that objects of heap allocated types hold a strong reference to their type

[Tim Peters]

Tim Peters  added the comment:

There is no possible world in which the best answer is "hack gcmodule.c" ;-)

I haven't tried to dig into the details here, but Pablo's approach looked 
spot-on to me:  put the solution near the source of the problem.  The problem 
is specific to a relatively tiny number of objects, and all gc asks is that 
they play by the rules.

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[issue40048] _PyEval_EvalFrameDefault() doesn't reset tstate->frame if _PyCode_InitOpcache() fails

[STINNER Victor]

Change by STINNER Victor :


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[issue33065] IDLE debugger: failure stepping through module loading

[Timothy Geiser]

Timothy Geiser  added the comment:

Looks good when testing both the minimal example and the pgpdump original case.

I added the import at the top, and changed the original line 173 from

value = repr(value)

to

value = reprlib.repr(value)

This is based on lines 160 & 161 in reprlib (we need a Repr instance, but 
reprlib makes it's own for us to use).

I get a nice boring and not-crashy result in the debug window for Locals:

data   b''
self   

Thanks for the fix, Terry!
I shouldn't expect any strange side-effects from this, should I?

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[issue40340] Programming FAQ about "How do I convert a string to a number?" contains a typo

[Roundup Robot]

Change by Roundup Robot :


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[issue39932] test_multiprocessing_fork leaked [0, 2, 0] file descriptors on aarch64 RHEL8 Refleaks 3.7 buildbot

[STINNER Victor]

Change by STINNER Victor :


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[issue33065] IDLE debugger: failure stepping through module loading

[ppperry]

Change by ppperry :


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[issue39983] test.regrtest: test marked as failed (env changed), but no warning: test_multiprocessing_forkserver

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 3340b2a61b458e7087c8c5fea063b1b45e1a4a07 by Victor Stinner in 
branch '3.8':
bpo-39983: Add test.support.print_warning() (GH-19683) (GH-19687)
https://github.com/python/cpython/commit/3340b2a61b458e7087c8c5fea063b1b45e1a4a07


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[issue39932] test_multiprocessing_fork leaked [0, 2, 0] file descriptors on aarch64 RHEL8 Refleaks 3.7 buildbot

[STINNER Victor]

Change by STINNER Victor :


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[issue40334] PEP 617: new PEG-based parser

[Guido van Rossum]

Change by Guido van Rossum :


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[issue32759] multiprocessing.Array do not release shared memory

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 857d573257ab150d6bea666354312a5fd284b171 by Victor Stinner in 
branch '3.7':
bpo-39932: Fix multiprocessing test_heap() (GH-19690)
https://github.com/python/cpython/commit/857d573257ab150d6bea666354312a5fd284b171


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[issue39932] test_multiprocessing_fork leaked [0, 2, 0] file descriptors on aarch64 RHEL8 Refleaks 3.7 buildbot

[STINNER Victor]

STINNER Victor  added the comment:


New changeset 857d573257ab150d6bea666354312a5fd284b171 by Victor Stinner in 
branch '3.7':
bpo-39932: Fix multiprocessing test_heap() (GH-19690)
https://github.com/python/cpython/commit/857d573257ab150d6bea666354312a5fd284b171


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