[issue34396] Certain methods that heap allocated subtypes inherit suffer a 50-80% performance penalty

[Inada Naoki]

Change by Inada Naoki :


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[issue39775] inspect.Signature.parameters should be an OrderedDict, not a plain dict

[Antony Lee]

Antony Lee  added the comment:

It looks good to me, thanks.

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[issue39779] [argparse] Add parameter to sort help output arguments

[brian.gallagher]

brian.gallagher  added the comment:

That makes sense. For what it's worth, the use-case that inspired this was for 
commands with a lot of optional arguments in a company where a large amount of 
contributors (who may not be aware of an effort to order the arguments in the 
source code) were able to make changes to the command.

I understand that isn't a particularly compelling reason though, as it can be 
addressed by other means -- increasing diligence at the code review stage, 
commit hooks, testing, etc.

Thanks for taking a look Raymond.

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[issue39712] Doc for `-X dev` option should mention PYTHONDEVMODE

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland :


Added file: https://bugs.python.org/file48928/0001-3.7-bpo-39712.patch

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[issue39712] Doc for `-X dev` option should mention PYTHONDEVMODE

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland :


--
keywords: +patch
Added file: https://bugs.python.org/file48926/0001-bpo-39712.patch

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[issue39712] Doc for `-X dev` option should mention PYTHONDEVMODE

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland :


Added file: https://bugs.python.org/file48927/0001-3.8-bpo-39712.patch

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[issue39712] Doc for `-X dev` option should mention PYTHONDEVMODE

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland :


--
nosy: +erlendaasland
nosy_count: 9.0 -> 10.0
pull_requests: +18045
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/18685

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[issue39782] local varible referenced a Exception won't be collected in function

[Wang Jie]

New submission from Wang Jie :

I referenced an Exception object in a function and found memory usage will 
increase constantly in the accident. I think it may be a bug.

I wrote a minimal code to reproduce it.

```py
from threading import local, Thread
from time import sleep

l = {}

def t0():
  b = l.get('e') # memory usage won't increase if I remove this line
  try:
raise Exception('1')
  except Exception as e:
l['e'] = e

def target():
  while True:
sleep(0.0001)
t0()

target()

# t = Thread(target=target)
# t.daemon = True
# t.start()
```

I tried to execute it in IPython and got the following output:

```
In [1]: run py/ref_exception_causes_oom.py

In [2]: import objgraph

In [3]: objgraph.show_growth(limit=3)
frame78792+78792
Exception78779+78779
traceback78779+78779

In [4]: objgraph.show_growth(limit=3)
Exception   100862+22083
traceback   100862+22083
frame   100875+22083

In [5]: objgraph.show_growth(limit=3)
Exception   115963+15101
traceback   115963+15101
frame   115976+15101
```

And I tried to execute this code in python2.7 and pypy. Both of them won't 
occur this problem.

--
components: Interpreter Core
messages: 362873
nosy: wangjie
priority: normal
severity: normal
status: open
title: local varible referenced a Exception won't be collected in function
type: resource usage
versions: Python 3.7

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[issue39783] Optimize construction of Path from other Paths by just returning the same object?

[Antony Lee]

New submission from Antony Lee :

Many functions which take a path-like object typically also accept strings 
(sorry, no hard numbers here).  This means that if the function plans to call 
Path methods on the object, it needs to first call Path() on the arguments to 
convert them, well, to Paths.  This adds an unnecessary cost in the case where 
the argument is *already* a Path object (which should become more and more 
common as the use of pathlib spreads), as Path instantiation is not exactly 
cheap (it's on the order of microseconds).

Instead, given that Paths are immutable, `Path(path)` could just return the 
exact same path instance, completely bypassing instance creation (after 
checking that the argument's type exactly matches whatever we need and is not, 
say, PureWindowsPath when we want to instantiate a PosixPath, etc.).  Note that 
there is prior art for doing so in CPython: creating a frozenset from another 
frozenset just returns the same instance:
```
In [1]: s = frozenset({1}); id(s) == id(frozenset(s)) == id(s.copy())
Out[1]: True
```

--
components: Library (Lib)
messages: 362874
nosy: Antony.Lee
priority: normal
severity: normal
status: open
title: Optimize construction of Path from other Paths by just returning the 
same object?
versions: Python 3.9

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[issue1207613] Idle Editor: Bottom Scroll Bar

[Steven D'Aprano]

Change by Steven D'Aprano :


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[issue39776] Crash in decimal module in heavy-multithreaded scenario

[Stefan Krah]

Stefan Krah  added the comment:

This is 3.6.7, compiled --with-pydebug:


$ ./main 
Aborted (core dumped)



(gdb) bt
#0  0x7f9974077428 in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:54
#1  0x7f997407902a in __GI_abort () at abort.c:89
#2  0x0056e2d1 in Py_FatalError (msg=msg@entry=0x62ccf8 "Python memory 
allocator called without holding the GIL") at Python/pylifecycle.c:1462
#3  0x004c0cec in _PyMem_DebugCheckGIL () at Objects/obmalloc.c:1963
#4  0x004c0d27 in _PyMem_DebugMalloc (ctx=0x8f7220 <_PyMem_Debug+96>, 
nbytes=75) at Objects/obmalloc.c:1971
#5  0x004c204e in PyObject_Malloc (size=) at 
Objects/obmalloc.c:479
#6  0x004ec12f in PyUnicode_New (size=10, maxchar=) at 
Objects/unicodeobject.c:1281
#7  0x005162f4 in _PyUnicodeWriter_PrepareInternal 
(writer=writer@entry=0x7f9971ca4cf0, length=length@entry=10, maxchar=, maxchar@entry=127) at Objects/unicodeobject.c:13565
#8  0x0051af20 in PyUnicode_DecodeUTF8Stateful (s=0x61d15b 
"crash_test", size=10, errors=errors@entry=0x0, consumed=consumed@entry=0x0) at 
Objects/unicodeobject.c:5067
#9  0x0051c6b0 in PyUnicode_FromString (u=) at 
Objects/unicodeobject.c:2077
#10 0x00563c1c in PyImport_ImportModule (name=) at 
Python/import.c:1266
#11 0x004531dd in pybind11::module::import (name=0x61d15b "crash_test") 
at ./pybind11/include/pybind11/pybind11.h:849
#12 0x00446434 in ThreadFunc () at main.cpp:30
#13 0x0046a1b1 in std::_Bind_simple::_M_invoke<>(std::_Index_tuple<>) (this=0x10c28d8) at 
/usr/include/c++/5/functional:1531
#14 0x0046a10a in std::_Bind_simple::operator()() 
(this=0x10c28d8) at /usr/include/c++/5/functional:1520
#15 0x0046a09a in std::thread::_Impl 
>::_M_run() (this=0x10c28c0) at /usr/include/c++/5/thread:115
#16 0x7f99749e3c80 in ?? () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#17 0x7f99750bb6ba in start_thread (arg=0x7f9971ca5700) at 
pthread_create.c:333
#18 0x7f997414941d in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:109

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[issue39776] Crash in decimal module in heavy-multithreaded scenario

[Stefan Krah]

Stefan Krah  added the comment:

Note that my pybind11 is from GitHub master, it can also be a pybind11
issue.


It is interesting that you cannot reproduce your original issue with
3.6, so I'm reopening this issue.

I think we need a reproducer without pybind11 though, could you
tweak Programs/_testembed.c (from the CPython sources) to run the
crash script?

--
status: closed -> open

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[issue39776] Crash in decimal module in heavy-multithreaded scenario

[Stefan Krah]

Change by Stefan Krah :


--
resolution: not a bug -> 
stage: resolved -> 

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[issue39776] Crash in decimal module in heavy-multithreaded scenario

[Evgeny Boytsov]

Evgeny Boytsov  added the comment:

Your callstack is very strange. At line 30 of main.cpp GIL is obviously locked:


   // importing module in this tread
   gstate = PyGILState_Ensure();
   py::module crash_test = py::module::import( "crash_test" ); <-- import
   PyGILState_Release( gstate );

I suppose that there is something wrong with your setup. Maybe - wrong working 
directory for the main executable, which doesn't contain crash_test.py

Also I've tried to revert this patch 
https://github.com/python/cpython/pull/5278 for 3.7. It makes problem to 
disappear, 1 hour of stable work under ASAN. So I suppose it is the source of 
the bug.

I will try to tweak _testembed.c.

--
resolution:  -> not a bug

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[issue39776] Crash in decimal module in heavy-multithreaded scenario

[Stefan Krah]

Stefan Krah  added the comment:

Regarding *my* issue, it could be anything, e.g. a missing call to
PyEval_InitThreads() in 3.6:

"Changed in version 3.7: This function is now called by Py_Initialize(), so you 
don’t have to call it yourself anymore."


This is why we need to eliminate pybind11 so we can see what is
actually going on.

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[issue29076] Mac installer shell updater script silently fails if default shell is fish

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland  added the comment:

I've created a patch that applies fine to 3.7, 3.8 and 3.9, if anyone still is 
interested.

(Backporting to 3.6 and 2.7 is probably not going to happen, but at least the 
patch applies fine to both of them.)


The "Versions" label list should probably be updated to include 3.8 and 3.9.

--
keywords: +patch
nosy: +erlendaasland
Added file: 
https://bugs.python.org/file48929/0001-bpo-29076-Add-fish-support-to-macOS-build.patch

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[issue39783] Optimize construction of Path from other Paths by just returning the same object?

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
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[issue39776] Crash in decimal module in heavy-multithreaded scenario

[Evgeny Boytsov]

Evgeny Boytsov  added the comment:

I rewrote my example without pybind and eliminated C++ module (I realized that 
time.sleep() also releases the GIL, so we achieve the same effect). Still the 
same results: with python 3.7.3 app crashes with attached ASAN output, with 
python 3.7.3 without https://github.com/python/cpython/pull/5278 works just 
fine.

To run main.cpp you should add directory with crash_test.py to PYTHONPATH.

--
Added file: https://bugs.python.org/file48930/threaded_crash.zip

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[issue12915] Add inspect.locate and inspect.resolve

[Vinay Sajip]

Vinay Sajip  added the comment:


New changeset 4f17c5cd9a1ec50fe8de7ef68c39220a01a862cb by Vinay Sajip in branch 
'master':
bpo-12915: Improve Unicode support for package names and attributes. (GH-18517)
https://github.com/python/cpython/commit/4f17c5cd9a1ec50fe8de7ef68c39220a01a862cb


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[issue39776] Crash in decimal module in heavy-multithreaded scenario

[Evgeny Boytsov]

Evgeny Boytsov  added the comment:

Also I understood the source of your crash with my initial example. Since you 
haven't used CMake to configure project, pybind didn't setup required macroses 
to enable threading support. So no issues in pybind.

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[issue28429] ctypes fails to import with grsecurity's TPE

[E. Castedo Ellerman]

E. Castedo Ellerman  added the comment:

This is now fixed in Python 3.8. See https://bugs.python.org/issue35523

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[issue39783] Optimize construction of Path from other Paths by just returning the same object?

[Raymond Hettinger]

Raymond Hettinger  added the comment:

Possibly this could be done just by adding @lru_cache to the __new__() method.

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[issue39776] Crash in decimal module in heavy-multithreaded scenario

[Stefan Krah]

Stefan Krah  added the comment:

> With python 3.7.3 without https://github.com/python/cpython/pull/5278 works 
> just fine.

Thanks, I'm now getting the same results as you. Looking at the smaller
test case, I also agree that it should work (as it did in 3.6).

--
keywords: +3.7regression
resolution: not a bug -> 
stage:  -> needs patch
type:  -> crash

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[issue39783] Optimize construction of Path from other Paths by just returning the same object?

[Rémi Lapeyre]

Rémi Lapeyre  added the comment:

There is the _closed attribute thought that is mutated by some methods.

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[issue27257] get_addresses results in traceback with an addrspec with an empty local part.

[Roundup Robot]

Change by Roundup Robot :


--
keywords: +patch
nosy: +python-dev
nosy_count: 4.0 -> 5.0
pull_requests: +18046
stage: test needed -> patch review
pull_request: https://github.com/python/cpython/pull/18687

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[issue39783] Optimize construction of Path from other Paths by just returning the same object?

[Antony Lee]

Antony Lee  added the comment:

Decorating __new__ with lru_cache would likely run into memory leakage 
problems? (one would need a "weak lru_cache", I guess).

I didn't know about the _closed attribute. From a quick look it appears to only 
be settable by using the path (not the actual file) as a context manager, and 
only serves to block further filesystem methods, but I'm not even sure why? 
(for example, it doesn't block fspath, so it won't prevent operations via 
os.path functions anyways...)

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[issue39784] Tuple comprehension

[Marco Sulla]

New submission from Marco Sulla :

I think a tuple comprehension could be very useful.

Currently, the only way to efficiently create a tuple from a comprehension is 
to create a list comprehension (generator comprehensions are more slow) and 
convert it with `tuple()`.

A tuple comprehension will do exactly the same thing, but without the creation 
of the intermediate list.

IMHO a tuple comprehension can be very useful, because:

1. there are many cases in which you create a list with a comprehension, but 
you'll never change it later. You could simply convert it with `tuple()`, but 
it will require more time
2. tuples uses less memory than lists
3. tuples can be interned

As syntax, I propose 

(* expr for x in iterable *)

with absolutely no blank character between the character ( and the *, and the 
same for ).

Well, I know, it's a bit strange syntax... but () are already taken by 
generator comprehensions. Furthermore, the * remembers a snowflake, and tuples 
are a sort of "frozenlists".

--
components: Interpreter Core
messages: 362888
nosy: Marco Sulla
priority: normal
severity: normal
status: open
title: Tuple comprehension
versions: Python 3.9

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[issue14678] Update zipimport to support importlib.invalidate_caches()

[Chris Wilcox]

Chris Wilcox  added the comment:

That is my thinking as well after rooting around a bit. I unfortunately am not 
knowledgable enough here to be 100% sure it is complete.

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[issue37266] Daemon threads must be forbidden in subinterpreters

[Antoine Pitrou]

Antoine Pitrou  added the comment:

There will be a problem with `concurrent.futures.ProcessPoolExecutor`, which 
currently launches its management thread as a daemon thread.  The daemon thread 
itself is not problematic, because ProcessPoolExecutor uses an atexit hook to 
shutdown itself and therefore join the management thread.

It seems, however, that it's not easy to make the thread non-daemon, because 
atexit hooks are executed *after* non-daemon threads are joined.  That would 
lead to a deadlock: the interpreter would wait for the non-daemon management 
thread to exit, but the ProcessPoolExecutor would wait for the atexit hook to 
be called before telling the management thread to exit.

cc'ing Thomas Moreau, who's worker a lot on this.

--
nosy: +pitrou, tomMoral

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[issue37266] Daemon threads must be forbidden in subinterpreters

[Antoine Pitrou]

Antoine Pitrou  added the comment:

Perhaps the solution would be to have an additional kind of atexit hooks, which 
get executed before threads are joined.

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[issue39785] usr/bin/python doesn't use default python (3) on Windows

[fireattack]

New submission from fireattack :

STR

1. Install both Py2 and 3. 
2. Make sure Py3 is the default.
3. (Optional) Make sure only Python3 is in path, not Python2.

Run the following script from CMD:

```
#!/usr/bin/python

import platform
print(platform.python_version())
```

What expected:

3.8.1

What happened: 

2.8.5

According to https://docs.python.org/3/using/windows.html#shebang-lines, 
`#!/usr/bin/python` should use the default python. My environment is set to 
default to py3, and I don't even have python2 in my PATH. 

C:\Users\ikena\Desktop>py --version
Python 3.8.1

C:\Users\ikena\Desktop>python --version
Python 3.8.1

C:\Users\ikena\Desktop>where python
C:\Users\ikena\AppData\Local\Programs\Python\Python38\python.exe
C:\Users\ikena\AppData\Local\Microsoft\WindowsApps\python.exe

--
components: Windows
messages: 362892
nosy: fireattack, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: usr/bin/python doesn't use default python (3) on Windows
versions: Python 3.8

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[issue38576] CVE-2019-18348: CRLF injection via the host part of the url passed to urlopen()

[Ryan Ware]

Change by Ryan Ware :


--
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[issue39785] usr/bin/python doesn't use default python (3) on Windows

[fireattack]

fireattack  added the comment:

I've searched and found some related issue, but none is specific for this. 

For example, Segev Finer mentioned that "[..] "#!/usr/bin/python" which will 
prefer Python 2" in issue 34274 but didn't mention why it would/should.

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[issue39785] #!/usr/bin/python shebang doesn't use default python (3) on Windows

[fireattack]

Change by fireattack :


--
title: usr/bin/python doesn't use default python (3) on Windows -> 
#!/usr/bin/python shebang doesn't use default python (3) on Windows

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[issue39781] IDLE: Do not jump when select in codecontext

[Terry J. Reedy]

Terry J. Reedy  added the comment:


New changeset c705fd1e89ccb8f6d414ec817b4616546147d877 by Terry Jan Reedy in 
branch 'master':
bpo-39781: Do not jump when select in IDLE codecontext (GH-18683)
https://github.com/python/cpython/commit/c705fd1e89ccb8f6d414ec817b4616546147d877


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[issue39781] IDLE: Do not jump when select in codecontext

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 2.0 -> 3.0
pull_requests: +18047
pull_request: https://github.com/python/cpython/pull/18688

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[issue39781] IDLE: Do not jump when select in codecontext

[miss-islington]

Change by miss-islington :


--
pull_requests: +18048
pull_request: https://github.com/python/cpython/pull/18689

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[issue39785] #!/usr/bin/python shebang doesn't use default python (3) on Windows

[fireattack]

fireattack  added the comment:

Interestingly, I can't seem to reproduce this bug on my another Win7 machine 
with similar setup.

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[issue39785] #!/usr/bin/python shebang doesn't use default python (3) on Windows

[Steve Dower]

Steve Dower  added the comment:

This is not strictly a duplicate of issue28686, but it's close enough, so let's 
keep the discussion of changing the original shebang behaviour over no that 
issue.

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> py.exe ignored PATH when using python3 shebang

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[issue34274] Python launcher behavior with "#!/usr/bin/env python" shebang

[Steve Dower]

Steve Dower  added the comment:

This is not strictly a duplicate of issue28686, but it's close enough, so let's 
keep the discussion of changing the original shebang behaviour over on that 
issue.

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

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[issue34274] Python launcher behavior with "#!/usr/bin/env python" shebang

[Steve Dower]

Change by Steve Dower :


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[issue39784] Tuple comprehension

[Batuhan Taskaya]

Batuhan Taskaya  added the comment:

This change needs to be discussed first on Python-ideas, and ideally needs a 
PEP (and a sponsor). So you should post it on Python-ideas mailing list or 
discuss.python.org Ideas section.

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[issue39784] Tuple comprehension

[Batuhan Taskaya]

Batuhan Taskaya  added the comment:

This change needs to be discussed first on Python-ideas, and ideally needs a 
PEP (and a sponsor). So you should post it on Python-ideas mailing list or 
discuss.python.org Ideas section.

--
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[issue39784] Tuple comprehension

[Batuhan Taskaya]

Change by Batuhan Taskaya :


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[issue39781] IDLE: Do not jump when select in codecontext

[miss-islington]

miss-islington  added the comment:


New changeset f4198aee4c288ce47c5803e87a461e31f81a0138 by Miss Islington (bot) 
in branch '3.7':
bpo-39781: Do not jump when select in IDLE codecontext (GH-18683)
https://github.com/python/cpython/commit/f4198aee4c288ce47c5803e87a461e31f81a0138


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[issue28686] py.exe ignored PATH when using python3 shebang

[Steve Dower]

Steve Dower  added the comment:

So we're missing two things to move this forward:

1. A clear specification (and user-facing explanation) of the behaviour of 
py.exe in the presence of all possible shebangs and PATH settings
2. Someone willing to update the code

Given the current behaviour is described in PEP 397, step one probably requires 
a new PEP (unless it turns out to be a single sentence explanation, which so 
far, it has not). I'd be happy to sponsor such a PEP, but I don't feel the need 
for it and so I'm not inclined to write it myself.

Also worth noting is that the Microsoft Store package of Python *does* include 
versioned executables (because we're able to provide them without causing 
excessive clutter on PATH), but it does not include py.exe (because the 
versioning of that would get broken really quickly).

--
versions: +Python 3.8, Python 3.9 -Python 3.5, Python 3.6, Python 3.7

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[issue39781] IDLE: Do not jump when select in codecontext

[miss-islington]

miss-islington  added the comment:


New changeset 846ca4961da24669e6e0c901986e66ff485917b2 by Miss Islington (bot) 
in branch '3.8':
bpo-39781: Do not jump when select in IDLE codecontext (GH-18683)
https://github.com/python/cpython/commit/846ca4961da24669e6e0c901986e66ff485917b2


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[issue39771] EmailMessage.add_header doesn't work

[R. David Murray]

R. David Murray  added the comment:

Since Outlook is one of the mailers that generates the non-RFC-compliant 
headers, it doesn't surprise me all that much that it can't interpret the RFC 
compliant headers correctly.

I'm not sure there is anything we can do here.

I suppose someone could do a survey of mail clients and document which ones can 
handle which style of parameter encoding.  If it turns out more handle the 
"wrong" way than handle the "right" way, we could consider adopting to the 
de-facto standard, although I won't like it much :)

(There is also a possibility there is a bug in our RFC compliance, but this is 
the first problem report I've seen.)

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[issue39704] Disable code coverage

[Brett Cannon]

Brett Cannon  added the comment:

I don't know if backporting will be needed; probably depends on the CI and 
whether they always pull from master or the branch that was affected. But I 
just tried backporting regardless and there's conflicts, so it will have to be 
done manually.

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[issue39781] IDLE: Do not jump when select in codecontext

[Terry J. Reedy]

Change by Terry J. Reedy :


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

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[issue14678] Update zipimport to support importlib.invalidate_caches()

[Brett Cannon]

Brett Cannon  added the comment:

It looks like it hasn't been done, else 
https://github.com/python/cpython/blob/master/Lib/zipimport.py would have some 
definition of a invalidate_caches() method. And specifically the finder lacks 
that method so it can be called by 
https://github.com/python/cpython/blob/c705fd1e89ccb8f6d414ec817b4616546147d877/Lib/importlib/_bootstrap_external.py#L1245-L1257.

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[issue39757] EmailMessage bad encoding for international domain

[R. David Murray]

R. David Murray  added the comment:

This is not actually a duplicate of 11783.  Rereading (parts of) that issue, we 
decided we currently have no good way to do automatic conversion between 
unicode and internationalized domains, so the user of the library has to do it 
themselves.  This means that the bug *here* is that the new email API is 
*wrongly* encoding the non-ascii in the domain by using an encoded word.  I'm 
surprised at that; I thought I'd guarded against it.

What should be happening here is that an error should be raised when that 
header is set (or possibly when it is accessed/serialized, but when set would 
be better I think) saying that there is non-ascii in the domain part.

--
resolution: duplicate -> 
stage: resolved -> needs patch
status: closed -> open
superseder: email parseaddr and formataddr should be IDNA aware -> 
title: EmailMessage wrong encoding for international domain -> EmailMessage bad 
encoding for international domain

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[issue8824] Improve documentation of exec

[Terry J. Reedy]

Terry J. Reedy  added the comment:

I decided that the alternate addition in #13557 is enough.

--
resolution:  -> out of date
stage: patch review -> resolved
status: open -> closed
versions:  -Python 2.7

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[issue28686] py.exe ignored PATH when using python3 shebang

[fireattack]

fireattack  added the comment:

Just copy/paste a related issue reported in issue39785:

When run a python script with "#!/usr/bin/python" shebang with py.exe, it will 
always use python2 instead of python3 on Win 10, despite the default being set 
to py3 already (so does the PATH).

According to https://docs.python.org/3/using/windows.html#shebang-lines, 
`#!/usr/bin/python` should use the default python, not just python 2.

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[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[Terry J. Reedy]

Change by Terry J. Reedy :


--
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pull_request: https://github.com/python/cpython/pull/18690

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[issue39786] Have the heaps library support max heap

[signing_agreement]

New submission from signing_agreement :

For numeric types, I can negate the numeric argument for max heaps, but if I 
have strings, I cannot go about negating them.

--
components: Library (Lib)
messages: 362909
nosy: signing_agreement
priority: normal
severity: normal
status: open
title: Have the heaps library support max heap
type: enhancement
versions: Python 3.9

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[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[Terry J. Reedy]

Terry J. Reedy  added the comment:

PR-18690 makes the approved change of 'string' to 'specification'.  After 
merging, I will re-review the other changes in i13790b.diff and possibly make 
another PR for review.

--
versions: +Python 3.9 -Python 2.7, Python 3.6

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[issue37266] Daemon threads must be forbidden in subinterpreters

[Antoine Pitrou]

Antoine Pitrou  added the comment:

Also cc'ing Kyle for the concurrent.futures issue.

--
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[issue36516] Python Launcher can not recognize pyw file as Python GUI Script file type correctly.

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland  added the comment:

I might have missed something, but I thought .pyw files were a Windows specific 
thing.

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[issue39710] "will be returned as unicode" reminiscent from Python 2

[Pete Wicken]

Change by Pete Wicken :


--
nosy: +Wicken
nosy_count: 3.0 -> 4.0
pull_requests: +18050
pull_request: https://github.com/python/cpython/pull/18691

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[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[Terry J. Reedy]

Terry J. Reedy  added the comment:


New changeset 916895f93905f8b8dad677cceff501833f5a633a by Terry Jan Reedy in 
branch 'master':
bpo-13790: Change 'string' to 'specification' in format doc (GH-18690)
https://github.com/python/cpython/commit/916895f93905f8b8dad677cceff501833f5a633a


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[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 7.0 -> 8.0
pull_requests: +18052
pull_request: https://github.com/python/cpython/pull/18692

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[issue39710] "will be returned as unicode" reminiscent from Python 2

[Pete Wicken]

Change by Pete Wicken :


--
pull_requests:  -18050

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[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[miss-islington]

Change by miss-islington :


--
pull_requests: +18054
pull_request: https://github.com/python/cpython/pull/18693

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[issue39710] "will be returned as unicode" reminiscent from Python 2

[Pete Wicken]

Change by Pete Wicken :


--
pull_requests: +18053
pull_request: https://github.com/python/cpython/pull/18691

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[issue39787] test_ssl and test_urllib2_localnet failing with new OpenSSL

[Matheus Castanho]

New submission from Matheus Castanho :

test_ssl and test_urllib2_localnet are failing when Python is built against 
top-of-tree OpenSSL. I'm attaching the output of: `regrtest.py test_ssl 
test_urllib2_localnet -W`

The output is from a powerpc64le machine with Python 3.8.2+ (1bbb81b251bc) and 
OpenSSL master (db943f43a60d1b).

A git bisect showed the problems started with the following OpenSSL commit:

commit db943f43a60d1b5b1277e4b5317e8f288e7a0a3a
Author: Matt Caswell 
Date:   Fri Jan 17 17:39:19 2020 +

Detect EOF while reading in libssl

If we hit an EOF while reading in libssl then we will report an error
back to the application (SSL_ERROR_SYSCALL) but errno will be 0. We add
an error to the stack (which means we instead return SSL_ERROR_SSL) and
therefore give a hint as to what went wrong.

Contains a partial fix for #10880

Reviewed-by: Tomas Mraz 
Reviewed-by: Dmitry Belyavskiy 
(Merged from https://github.com/openssl/openssl/pull/10882)

This also looks similar to: https://bugs.python.org/issue28689

--
assignee: christian.heimes
components: SSL, Tests
files: test-output.txt
messages: 362915
nosy: christian.heimes, mscastanho
priority: normal
severity: normal
status: open
title: test_ssl and test_urllib2_localnet failing with new OpenSSL
type: behavior
versions: Python 3.7, Python 3.8, Python 3.9
Added file: https://bugs.python.org/file48931/test-output.txt

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[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[miss-islington]

miss-islington  added the comment:


New changeset 5157506e043f75f49caecae1c6afee8517a7bbb0 by Miss Islington (bot) 
in branch '3.7':
bpo-13790: Change 'string' to 'specification' in format doc (GH-18690)
https://github.com/python/cpython/commit/5157506e043f75f49caecae1c6afee8517a7bbb0


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[issue13790] In str.format an incorrect error message for list, tuple, dict, set

[miss-islington]

miss-islington  added the comment:


New changeset 445152e0d3ab6e4381aef8d1404c2c17a516070f by Miss Islington (bot) 
in branch '3.8':
bpo-13790: Change 'string' to 'specification' in format doc (GH-18690)
https://github.com/python/cpython/commit/445152e0d3ab6e4381aef8d1404c2c17a516070f


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[issue37708] Harmonize random.choice(s) behavior with random.sample on iterators

[Roundup Robot]

Change by Roundup Robot :


--
nosy: +python-dev
nosy_count: 3.0 -> 4.0
pull_requests: +18055
pull_request: https://github.com/python/cpython/pull/18694

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[issue39788] Exponential notation should return an int if it can

[Marco Sulla]

New submission from Marco Sulla :

(venv_3_9) marco@buzz:~/sources/python-frozendict$ python
Python 3.9.0a0 (heads/master-dirty:d8ca2354ed, Oct 30 2019, 20:25:01) 
[GCC 9.2.1 20190909] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> a = 1E9
>>> type(a)


IMHO if the exponent is positive, and the  "base number" (1 in the example) is 
an integer, the result should be an integer.

Optionally, also if the "base number" has a number of decimal places <= the 
exponent, the result should be an integer. Example:

1.25E2 == 125

If the user wants a float, it can write

1.2500E2 == 125.0

--
components: Interpreter Core
messages: 362918
nosy: Marco Sulla
priority: normal
severity: normal
status: open
title: Exponential notation should return an int if it can
type: enhancement
versions: Python 3.9

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[issue39783] Optimize construction of Path from other Paths by just returning the same object?

[Rémi Lapeyre]

Rémi Lapeyre  added the comment:

> Decorating __new__ with lru_cache would likely run into memory leakage 
> problems?

I think the LRU cache would be for returning the same instance when called with 
the same string. I don't think it would be needed to return the same instance 
when called with a Path instance.

> From a quick look it appears to only be settable by using the path (not the 
> actual file) as a context manager, and only serves to block further 
> filesystem methods, but I'm not even sure why?

This came up in bpo-39682 recently, I'm not sure what this flag is supposed to 
mean and I could not find it in the documentation.

Since it's uncorrelated to the file object and the physical file, I think it 
may actually be dangerous to rely on this flag. I don't know why is the purpose 
of using Path as a context manager.

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[issue38780] SysLogHandler crash atexit

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland  added the comment:

Attached patch is based on Ronald Oussoren's and Alan Robertson's comments: 
Initialise self.socket to None early in __init()__, and then check for None in 
close() and emit(). Passes make test on 3.9, 3.8 and 3.7.

If this solution is ok I'll add a unit test for the case that triggered this 
report and prepare a PR.

--
keywords: +patch
nosy: +erlendaasland
Added file: 
https://bugs.python.org/file48932/0001-bpo-38780-Harden-socket-use-in-logging.handlers.patch

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[issue39771] EmailMessage.add_header doesn't work

[hwgdb Smith]

hwgdb Smith  added the comment:

I think program's goal is to solve problem, not solve the "standard".

OK, if you insist that "standard" has the Top priority, could you please tell 
me a way to change the default behavior of the new api to use the "=?utf-8?b?" 
parameter style. Is there a function or parameter i can use to achieve this?

If not, i think the best way to solve it is to add a "param style" parameter 
that i can choose which style i use.

And if not, i am sad about this, i had to use the legacy api.

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[issue38780] SysLogHandler crash atexit

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland :


Removed file: 
https://bugs.python.org/file48932/0001-bpo-38780-Harden-socket-use-in-logging.handlers.patch

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[issue38780] SysLogHandler crash atexit

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland :


Added file: 
https://bugs.python.org/file48933/0001-bpo-38780-Harden-socket-use-in-logging.handlers.patch

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[issue39771] EmailMessage.add_header doesn't work

[hwgdb Smith]

hwgdb Smith  added the comment:

https://litmus.com/blog/infographic-the-2019-email-client-market-share

And there is a survey about email client market share. You see outlook is top 3.

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[issue38380] Update SQLite to 3.30 in Windows and macOS installer builds

[Steve Dower]

Steve Dower  added the comment:

We still need the tag added to the cpython-source-deps repo, and I still can't 
complete a clone right now (something is strange with SSL to GitHub on my 
(temporary) internet connection).

Zach - can you tag it? https://github.com/python/cpython-source-deps/pull/17

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[issue39771] EmailMessage.add_header doesn't work

[hwgdb Smith]

hwgdb Smith  added the comment:

And i just send a mail to my Gmail. I view it using web, it is incorrectly!

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[issue39788] Exponential notation should return an int if it can

[Eric V. Smith]

Eric V. Smith  added the comment:

I strongly disagree. Even if I thought it was a good idea (I don't), we'd break 
too much code by making this change now.

--
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[issue38780] SysLogHandler crash atexit

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland  added the comment:

I'm a bit uncertain if the previous patch can handle the emit() case correctly. 
Proposed improvement in attached patch (0002-Improve-emit.patch).

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Added file: https://bugs.python.org/file48934/0002-Improve-emit.patch

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[issue39771] EmailMessage.add_header doesn't work

[hwgdb Smith]

hwgdb Smith  added the comment:

Sorry, the Gmail web is correctly.

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[issue38380] Update SQLite to 3.30 in Windows and macOS installer builds

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland  added the comment:

Yes, we need the tag for the Windows build, so the PR currently fails the 
Windows checks. (Tagging must be done explicitly by the maintainers, IIRC.) I 
also forgot to add a NEWS entry, so I'll do another push to add those (and kick 
off the CI) when the tag arrives.

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[issue38380] Update SQLite to 3.30 in Windows and macOS installer builds

[Ned Deily]

Ned Deily  added the comment:

Thanks for the PRs.  If we're going to update now as we should, why not to 
3.31.1 which is current?

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[issue38380] Update SQLite to 3.30 in Windows and macOS installer builds

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland  added the comment:

You're welcome. If you are ok with that, I'd be happy to prepare a PR for the 
source deps for sqlite3 v3.31.1, and update GH-18678 as soon as it is tagged.

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[issue39789] Update Windows release build machines to latest versions

[Steve Dower]

New submission from Steve Dower :

Shouldn't have any impact at all, but I'm going to mention it here so it gets 
in the NEWS file. Just in case someone hits an obscure edge case and is trying 
to find out what changed.

--
assignee: steve.dower
components: Windows
messages: 362931
nosy: paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Update Windows release build machines to latest versions
versions: Python 3.8, Python 3.9

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[issue39789] Update Windows release build machines to latest versions

[Steve Dower]

Change by Steve Dower :


--
keywords: +patch
pull_requests: +18056
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/18695

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[issue36516] Python Launcher can not recognize pyw file as Python GUI Script file type correctly.

[Ned Deily]

Ned Deily  added the comment:

Thanks for the PR.

I believe there also used to be a distinction between .py and .pyw files back 
in the distant past of classic MacOS (9 and earlier) and limited support for 
.pyw was carried over into Mac OS X (10).  But most of the references to .pyw 
for macOS have been removed over the years other than, it seems, here in Python 
Launcher.app. There are other more basic concerns with the Launcher app so I 
have been holding off on merging this change for 3.9.  I plan to make a 
decision about its fate by the end of the PyCon sprints in April.

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[issue38380] Update SQLite to 3.30 in Windows and macOS installer builds

[Ned Deily]

Ned Deily  added the comment:

I would prefer to go to 3.31.1 at this point particularly given the track 
record of the SQLite project. It's been released for a month now.  Any 
objections, Steve?

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[issue39682] pathlib.Path objects can be used as context managers

[Antony Lee]

Antony Lee  added the comment:

A problem of having this bit of state in paths is that it violates assumptions 
based on immutability/hashability, e.g. with

from pathlib import Path

p = Path("foo")
q = Path("foo")

with p: pass

unique_paths = {p, q}

print(len(unique_paths))  # == 1, as p == q
for path in unique_paths:
print(path.resolve())  # Fails if the path is closed.

The last line fails with `unique_paths = {p, q}` as p has been closed (and 
apparently sets keep the first element when multiple "equal" elements are 
passed in), but not with `unique_paths = {q, p}`.

It would also prevent optimizations based on immutability as proposed in 
https://bugs.python.org/issue39783.

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[issue38380] Update SQLite to 3.30 in Windows and macOS installer builds

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland  added the comment:

I agree. I've updated the branches for source deps and cpython. I'll wait for 
Steve's approval before I open a new PR over at cpython-source-deps and update 
GH-18678.

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[issue39717] Fix exception causes in tarfile module

[Terry J. Reedy]

Terry J. Reedy  added the comment:

While I have no specific opinion on tarfile, I strongly disagree with a blanket 
prohibition on 'from None'.  Its proper use is to maintain a defined API and 
hide irrelevant implementation details.  Realistic toy example:

def f(x, y):
"Return (x+y)/y for non-zery y."

if y == 0:  # Body 1: look ahead.
raise ValueError('y cannot be 0')
else:
return (x+y)/y
# or
try:  # Body 2: leap first.
return (x+y)/y
except ZeroDivisionError:
raise ValueError('y cannot be 0') from None

'from e' instead of 'from None' would just add distracting noise.

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nosy: +terry.reedy

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[issue39790] LICENSE.TXT file does not contain all incorporated software

[Steve Dower]

New submission from Steve Dower :

Looking at https://docs.python.org/3/license.html there's a list of 
"incorporated software" licenses, most of which say you need to distribute the 
license.

Right now, the LICENSE.txt file we distribute on Windows (made from the 
/LICENSE and PC/crtlicense.txt files in the repo, plus those in the source 
dependencies) does not include any of these licenses that come from C source 
files.

Arguably, we should just include all of them in a central file somewhere in the 
repo, even though there'd be some duplication.

(I have no idea whether other distros correctly gather it all together.)

--
components: Windows
messages: 362937
nosy: brett.cannon, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
stage: needs patch
status: open
title: LICENSE.TXT file does not contain all incorporated software
versions: Python 3.7, Python 3.8, Python 3.9

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[issue38380] Update SQLite to 3.30 in Windows and macOS installer builds

[Steve Dower]

Steve Dower  added the comment:

Isn't that what we ended up merging? (Goes to check). Ah, that was 3.30.1.

Sure, go for it. We'll have RCs of everything before the next final releases go 
out, so provided someone double checks that it's all good before then I'm okay 
with it.

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[issue39718] TYPE_IGNORE, COLONEQUAL missing from py38 changes in token docs

[Terry J. Reedy]

Terry J. Reedy  added the comment:

I verified the additions in token.py.  Thanks for the report.

--
assignee: docs@python -> terry.reedy
nosy: +terry.reedy
type:  -> behavior
versions: +Python 3.8, Python 3.9

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[issue39783] Optimize construction of Path from other Paths by just returning the same object?

[Barney Gale]

Barney Gale  added the comment:

Attempted fix shown here: 
https://github.com/barneygale/cpython/commit/784630ef6ad05031abdefa523e61e0629b15e201

Note that I've already removed context manager support (and hence `_closed`) in 
this branch.

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nosy: +barneygale

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[issue39718] TYPE_IGNORE, COLONEQUAL missing from py38 changes in token docs

[Terry J. Reedy]

Terry J. Reedy  added the comment:


New changeset c2f7eb254bee036afc8a71437ec6aac82f06a1ce by Shantanu in branch 
'master':
bpo-39718: add TYPE_IGNORE, COLONEQUAL to py38 changes in token (GH-18598)
https://github.com/python/cpython/commit/c2f7eb254bee036afc8a71437ec6aac82f06a1ce


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[issue39718] TYPE_IGNORE, COLONEQUAL missing from py38 changes in token docs

[miss-islington]

Change by miss-islington :


--
nosy: +miss-islington
nosy_count: 3.0 -> 4.0
pull_requests: +18057
pull_request: https://github.com/python/cpython/pull/18696

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[issue39718] TYPE_IGNORE, COLONEQUAL missing from py38 changes in token docs

[miss-islington]

miss-islington  added the comment:


New changeset 7f53d87cb0324e391c969855ed8f4b3255f9f744 by Miss Islington (bot) 
in branch '3.8':
bpo-39718: add TYPE_IGNORE, COLONEQUAL to py38 changes in token (GH-18598)
https://github.com/python/cpython/commit/7f53d87cb0324e391c969855ed8f4b3255f9f744


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[issue39622] KeyboardInterrupt is ignored when await asyncio.sleep(0)

[Maor Kleinberger]

Change by Maor Kleinberger :


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versions: +Python 3.8, Python 3.9

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[issue39788] Exponential notation should return an int if it can

[Zachary Ware]

Zachary Ware  added the comment:

Agreed with Eric.

--
nosy: +zach.ware
resolution:  -> rejected
stage:  -> resolved
status: open -> closed

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