[issue38924] pathlib paths .normalize()

[Vedran Čačić]

Vedran Čačić  added the comment:

I think the real issue here

> mypath = PurePosixPath(normpath(mypath))

is the PurePosixPath wrapper. It is nice that normpath _accepts_ pathlike 
objects, but it should then not return a generic str. It should try to return 
an object of the same type.

Of course it's harder to do, especially in presence of pathlike objects of 
unknown classes, but with some reasonable assumptions on the constructors, it 
can be done---and it's much more useful. The similar debate, with similar 
conclusions, has already happened with datetime-like objects.

--
nosy: +veky

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[issue31456] SimpleCookie fails to parse any cookie if an entry has whitespace in the name

[Joel Rosdahl]

Change by Joel Rosdahl :


--
nosy: +Joel Rosdahl

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[issue38924] pathlib paths .normalize()

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

> Yes, exactly the same behaviour, but arguing that normpath() can take a 
> pathlib object is just saying that it saves you from doing an intermediate 
> str(), which is, well, nice, but still not pretty. Consider `mypath = 
> mypath.normalize()` vs. `mypath = PurePosixPath(normpath(mypath))`.

>From my experience in the past the intention has been to keep the API minimal 
>and below are some recent additions. Many discussions lead to the answer over 
>using a function that accepts a pathlike object already and if not add support 
>for it than add the API to pathlib itself. I will leave it to the experts on 
>this.

realink : issue30618
link_to : issue26978

--
nosy: +pitrou, serhiy.storchaka

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[issue38924] pathlib paths .normalize()

[Ionuț Ciocîrlan]

Ionuț Ciocîrlan  added the comment:

> Can you please add an example of how normalize() should behave?

```
>>> mypath = PurePosixPath("foo/bar/bzz")
>>> mypath /= "../../"
>>> mypath
PurePosixPath('foo/bar/bzz/../..')
>>> mypath = mypath.normalize()
>>> mypath
PurePosixPath('foo')
>>> mypath /= "../../../there"
>>> mypath
PurePosixPath('foo/../../../there')
>>> mypath = mypath.normalize()
>>> mypath
PurePosixPath('../../there')
>>> mypath /= "../../and/back/again"
>>> mypath
PurePosixPath('../../there/../../and/back/again')
>>> mypath = mypath.normalize()
>>> mypath
PurePosixPath('../../../and/back/again')
```

> I assume you want the same behaviour as os.path.normpath which already 
> accepts a pathlike object to be added to pathlib.

Yes, exactly the same behaviour, but arguing that normpath() can take a pathlib 
object is just saying that it saves you from doing an intermediate str(), which 
is, well, nice, but still not pretty. Consider `mypath = mypath.normalize()` 
vs. `mypath = PurePosixPath(normpath(mypath))`.

> Do note that Path inherits from PurePath, so providing a normalize() method 
> on the latter means it will end up on the former.

That could be "circumvented" with a bit of code shuffling, e.g. moving 
everything from `PurePath` to a `PathBase` or `_Path` or somesuch, and forking 
the inheritance from there. On the other hand, it might be useful. I personally 
can't think of a scenario, but the GNU folk certainly think so, see `realpath 
--logical`: 
https://www.gnu.org/software/coreutils/manual/html_node/realpath-invocation.html

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[issue38938] Iterable merge performance and inclusion in itertools

[Dennis Sweeney]

Dennis Sweeney  added the comment:

The following seems like it is a short, readable recipe for itertools.

--
Added file: https://bugs.python.org/file48748/merge_recipe.py

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[issue38938] Iterable merge performance and inclusion in itertools

[Karthikeyan Singaravelan]

Change by Karthikeyan Singaravelan :


--
nosy: +rhettinger

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[issue38938] Iterable merge performance and inclusion in itertools

[Dennis Sweeney]

New submission from Dennis Sweeney :

Although the implementation of the heapq.merge function uses an underlying heap 
structure, its behavior centers on iterators. For this reason, I believe there 
should either be an alias to this function in the itertools module or at least 
a recipe in the itertools docs describing the use of heapq.merge.

Furthermore, I have an implementation (attached) of heapq.merge that is twice 
as fast for two iterables (as used in mergesort and other common cases), and is 
faster for up to 6 or 7 iterables. I think it would be nice to special-case 
this for small numbers of iterables for this significant speedup.

--
components: Library (Lib)
files: iter_merge.py
messages: 357631
nosy: Dennis Sweeney
priority: normal
severity: normal
status: open
title: Iterable merge performance and inclusion in itertools
type: enhancement
versions: Python 2.7, Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9
Added file: https://bugs.python.org/file48747/iter_merge.py

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[issue38500] Provide a way to get/set PyInterpreterState.frame_eval without needing to access interpreter internals

[Paulo Henrique Silva]

Change by Paulo Henrique Silva :


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[issue35003] Provide an option to venv to put files in a bin/ directory on Windows

[Vinay Sajip]

Vinay Sajip  added the comment:

> I think Brett is thinking about eliminating the manual activate part 
> entirely, but any tool trying to automate that needs to do a lot of 
> platform-specific checks.

If you have more than one venv then it seems like some manual step is required 
to switch between them. What about a tool like Pew (Python Env Wrapper), which 
from the README "is completely shell-agnostic and thus works on bash, zsh, 
fish, powershell, etc."

https://github.com/berdario/pew

I haven't used in under Windows, but it works a treat on POSIX for me, YMMV of 
course.

Of course, scripts installed in venvs never need activation to run - they pick 
up the correct interpreter from their venv automatically.

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[issue38937] NameError in list comprehension within .pth file

[Roundup Robot]

Change by Roundup Robot :


--
keywords: +patch
pull_requests: +16895
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/17414

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[issue38937] NameError in list comprehension within .pth file

[Chris Billington]

Chris Billington  added the comment:

I see. site.py calls exec() from within a function, and therefore the code is 
executed in the context of that function's locals and the site module globals. 
This means the code in .pth files can access (but not add new) local names from 
the site.addpackage() function:

$ echo 'import sys; f.close()' | sudo tee 
/usr/lib/python3.8/site-packages/test.pth
import sys; f.close()
$ python
Fatal Python error: init_import_size: Failed to import the site module
Python runtime state: initialized
Traceback (most recent call last):
  File "/usr/lib/python3.8/site.py", line 580, in 
main()
  File "/usr/lib/python3.8/site.py", line 567, in main
known_paths = addsitepackages(known_paths)
  File "/usr/lib/python3.8/site.py", line 350, in addsitepackages
addsitedir(sitedir, known_paths)
  File "/usr/lib/python3.8/site.py", line 208, in addsitedir
addpackage(sitedir, name, known_paths)
  File "/usr/lib/python3.8/site.py", line 164, in addpackage
for n, line in enumerate(f):
ValueError: I/O operation on closed file.

The example with the sys module worked because sys is in the globals the site 
module already.

Probably site.addpackage() should exec() code it its own environment:

if line.startswith(("import ", "import\t")):
exec(line, {})
continue

(added empty dict for exec() call)

or for backward compatibility for .pth files that are using globals from the 
site module without importing them (such as sys or os):

if line.startswith(("import ", "import\t")):
exec(line, globals().copy())
continue

This resolves the original issue

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[issue38933] unusual behaviour on list of dependable lambdas

[Tim Peters]

Tim Peters  added the comment:

This behavior is intended and expected, so I'm closing this.

As has been explained, in any kind of function (whether 'lambda' or 'def'), a 
non-local variable name resolves to its value at the time the function is 
evaluated, not the value it _had_ at the time the function was defined.

If you need to use bindings in effect at the time the function is defined, then 
you need to do something to force that to happen.  A common way is to abuse 
Python's default-argument mechanism to initialize a local argument to the value 
of a non-local variable at function definition time.  In practice, e.g., this 
means changing the

lambda a:

in your first example to

lambda a, i=i:

Then, when the lambda is defined ('lambda' and 'def' are executable statements 
in Python! not just declarations), the then-current binding of non-local 
variable 'i' is captured and saved away as the default value of the local 
argument name 'i'.

--
nosy: +tim.peters
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue38937] NameError in list comprehension within .pth file

[Chris Billington]

New submission from Chris Billington :

The following one-liner works fine in a regular Python interpreter:

$ python -c 'import sys; x = 5; [print(x + i) for i in range(5)]'
5
6
7
8
9

But in a .pth file, it raises a NameError:

$ echo 'import sys; x = 5; [print(x + i) for i in range(5)]' | sudo tee 
/usr/lib/python3.8/site-packages/test.pth
$ python
Error processing line 1 of /usr/lib/python3.8/site-packages/test.pth:

  Traceback (most recent call last):
File "/usr/lib/python3.8/site.py", line 169, in addpackage
  exec(line)
File "", line 1, in 
File "", line 1, in 
  NameError: name 'x' is not defined

Remainder of file ignored
Python 3.8.0 (default, Oct 23 2019, 18:51:26) 
[GCC 9.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

Since site.py uses exec() to exec each line of a .pth file, I thought I'd 
compare with that. It also works fine:

$ python -c 'exec("import sys; x = 5; [print(x + i) for i in range(5)]")'
5
6
7
8
9

This slight modification (the variable being used in the next statement still, 
but not within the loop of the comprehension) does not raise a NameError:

$ echo 'import sys; x = 5; [print(i) for i in range(x)]' | sudo tee 
/usr/lib/python3.8/site-packages/test.pth
import sys; x = 5; [print(i) for i in range(x)]
$ python
0
1
2
3
4
Python 3.8.0 (default, Oct 23 2019, 18:51:26) 
[GCC 9.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

I know .pth file processing is very early in interpreter startup such that many 
things aren't working yet, but I wouldn't expect using a name defined outside a 
list comprehension within the loop body of said list comprehension not to work.

The following is fine also, showing that using names from outside the list 
comprehension doesn't always break:

$ echo 'import sys; [print(sys) for i in range(5)]' | sudo tee 
/usr/lib/python3.8/site-packages/test.pth
import sys; [print(sys) for i in range(5)]
$ python





Python 3.8.0 (default, Oct 23 2019, 18:51:26) 
[GCC 9.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 

This is fine too:

$ echo 'import sys; [print(str(sys) * i) for i in range(5)]' | sudo tee 
/usr/lib/python3.8/site-packages/test.pth
import sys; [print(str(sys) * i) for i in range(5)]
$ python





Python 3.8.0 (default, Oct 23 2019, 18:51:26) 
[GCC 9.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 


My use case is looping over subdirs of a directory and adding them all to 
sys.path to provide similar functionality to python setup.py develop, with all 
python vcs repositories within a specific directory being prepended to 
sys.path, rather than having to add them one-by-one. I probably won't end up 
doing what I'm doing this way, but in any case the above seems like it's a bug, 
unless I'm grossly misunderstanding something.

--
components: Interpreter Core
messages: 357627
nosy: Chris Billington
priority: normal
severity: normal
status: open
title: NameError in list comprehension within .pth file
versions: Python 3.8

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[issue35003] Provide an option to venv to put files in a bin/ directory on Windows

[Tzu-ping Chung]

Tzu-ping Chung  added the comment:

> Surely "on native Windows you run venv-path\Scripts\activate[.ps1], on POSIX 
> you use source venv-path/bin/activate" isn't *that* hard for new users to 
> grok [...]?

The if-Windows-X-else-Y part isn’t that hard; it’s the activate part that is :p

I think Brett is thinking about eliminating the manual activate part entirely, 
but any tool trying to automate that needs to do a lot of platform-specific 
checks.

---

> I've personally never come across Scripts in any other situation than virtual 
> environments [...].

Windows use a Scripts directory to store… scripts (Setuptools terminology, i.e. 
console and gui script entry points). So e.g. the global pip.exe would be at 
"{sys.prefix}\Scripts\pip.exe" (or is it sys.exec_prefix?) `pip install --user` 
would also install scripts into `%APPDATA%\Programs\Python\PythonXY\Scripts`. 
So venv’s setup is consistent with the rest of Python.

This directory structure can be expanded from sysconfig. So the proposal in my 
previous comment is to record the scheme in pyvenv.cfg, so you can have 
something like

def read_venv_scheme(env_dir):
with open(os.path.join(env_dir, 'pyvenv.cfg')) as f:
for line in f:
key, value = (p.strip() for p in line.split('='))
if key == 'scheme':
return value

def get_venv_environ_patch(env_dir):
scheme = read_venv_scheme(env_dir)
bin_dir = sysconfig.get_path('scripts', scheme=scheme, 
expand=False).format(base=env_dir)
return {'VIRTUAL_ENV': env_dir, 'PATH': bin_dir}

and this would give you the appropriate value on any platform.

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[issue35003] Provide an option to venv to put files in a bin/ directory on Windows

[Vinay Sajip]

Vinay Sajip  added the comment:

> Basically activation is the biggest stumbling block I find with new users

Surely "on native Windows you run venv-path\Scripts\activate[.ps1], on POSIX 
you use source venv-path/bin/activate" isn't *that* hard for new users to grok, 
and would cover the vast majority of users? (i.e. not including the other, 
less-common POSIX shells.)

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[issue35003] Provide an option to venv to put files in a bin/ directory on Windows

[Brett Cannon]

Brett Cannon  added the comment:

I've personally never come across Scripts in any other situation than virtual 
environments, but that isn't saying much about my Windows exposure either. :)

Basically activation is the biggest stumbling block I find with new users when 
it comes to trying to teach them about using virtual environments and this 
platform difference doesn't help. I would like to come up with _some_ solution 
to make it easier, even if it's something I have to put into the Python 
Launcher (although trying to get people to even agree on a name for virtual 
environments created beside the code turns out to be a hot topic). I would 
consider trying to come up with code so we have a `pipenv shell`/`conda shell` 
equivalent, but I've been told it is not pleasant to try and make work.

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[issue38916] Remove array.fromstring

[Brett Cannon]

Brett Cannon  added the comment:

> How about note it in the documentation and logging rather than removing them?

Yep, docs and raising DeprecationWarning should be good.

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[issue38936] fatal error during installation 0x80070643 during python installation

[kiranmai velishala]

New submission from kiranmai velishala :

Installing Python 3.8, Windows 10 64bit, exits installer and dumps the 
following error code to log.

[3D8C:422C][2019-11-28T22:23:28]e000: Error 0x80070643: Failed to run 
maintanance mode for MSI package.
[3D8C:422C][2019-11-28T22:23:28]e000: Error 0x80070643: Failed to configure 
per-user MSI package.
[3D8C:422C][2019-11-28T22:23:28]i319: Applied execute package: tcltk_JustForMe, 
result: 0x80070643, restart: None
[3D8C:422C][2019-11-28T22:23:28]e000: Error 0x80070643: Failed to execute MSI 
package.
[3D8C:422C][2019-11-28T22:23:28]i301: Applying rollback package: 
tcltk_JustForMe, action: Modify, path: C:\Users\kivelish\AppData\Local\Package 
Cache\{978278A0-0090-4A9C-8610-001061A495AF}v3.8.150.0\tcltk.msi, arguments: ' 
ARPSYSTEMCOMPONENT="1" MSIFASTINSTALL="7" 
TARGETDIR="C:\Users\kivelish\AppData\Local\Programs\Python\Python38-32" 
OPTIONALFEATURESREGISTRYKEY="Software\Python\PythonCore\3.8-32\InstalledFeatures"
 REMOVE="AssociateFiles"'
[3D8C:422C][2019-11-28T22:23:30]e000: Error 0x80070643: Failed to run 
maintanance mode for MSI package.
[3D8C:422C][2019-11-28T22:23:30]e000: Error 0x80070643: Failed to configure 
per-user MSI package.

0x80070643 - Fatal Error during installation

--
components: Windows
files: FATAL_ISSUE.zip
messages: 357622
nosy: kiranmai velishala, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: fatal error during installation 0x80070643 during python installation
type: crash
versions: Python 3.8
Added file: https://bugs.python.org/file48746/FATAL_ISSUE.zip

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[issue38920] Audit events for unhandled exceptions

[Steve Dower]

Change by Steve Dower :


--
stage: patch review -> commit review

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[issue38920] Audit events for unhandled exceptions

[Steve Dower]

Steve Dower  added the comment:


New changeset bea33f5e1db6e4a554919a82894f44568576e979 by Steve Dower in branch 
'master':
bpo-38920: Add audit hooks for when sys.excepthook and sys.unraisable hooks are 
invoked (GH-17392)
https://github.com/python/cpython/commit/bea33f5e1db6e4a554919a82894f44568576e979


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[issue38920] Audit events for unhandled exceptions

[Steve Dower]

Steve Dower  added the comment:


New changeset b74a6f14b94d36fb72b1344663e81776bf450847 by Steve Dower in branch 
'3.8':
bpo-38920: Add audit hooks for when sys.excepthook and sys.unraisablehook are 
invoked (GH-17392)
https://github.com/python/cpython/commit/b74a6f14b94d36fb72b1344663e81776bf450847


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[issue38928] EnvBuilder.upgrade_dependencies() does not exist on 3.8

[Vinay Sajip]

Change by Vinay Sajip :


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

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[issue38931] pathlib.Path on Windows - parser issue

[Zachary Ware]

Zachary Ware  added the comment:

You're welcome :)

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stage:  -> resolved
status: open -> closed

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[issue38928] EnvBuilder.upgrade_dependencies() does not exist on 3.8

[Vinay Sajip]

Vinay Sajip  added the comment:


New changeset 18d8edbbb6626ac9cdf1152a720811beb2230b33 by Vinay Sajip (Tzu-ping 
Chung) in branch '3.8':
bpo-38928: Remove upgrade_dependencies() from venv doc (GH-17410)
https://github.com/python/cpython/commit/18d8edbbb6626ac9cdf1152a720811beb2230b33


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[issue37347] Reference-counting problem in sqlite

[Sergey Fedoseev]

Change by Sergey Fedoseev :


--
pull_requests: +16894
pull_request: https://github.com/python/cpython/pull/17413

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[issue35003] Provide an option to venv to put files in a bin/ directory on Windows

[Tzu-ping Chung]

Tzu-ping Chung  added the comment:

There are more differences than Scripts/bin, like Windows use Lib but POSIX 
uses lib/pythonX.Y. IMO it’s probably better to stick with platform 
conventions, especially since those can be discovered with 
sysconfig.get_paths(expand=False).

I wonder whether it’d be a good idea to record what scheme was used to create 
the venv (in pyvenv.cfg). Any Python runtime can use that value in 
get_paths(scheme=..., expand=False) to know about the venv’s structure, even if 
the venv was created on another platform. This would be particularly useful to 
e.g. inspect a Windows-native venv in a WSL Python.

--
nosy: +uranusjr

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[issue38931] pathlib.Path on Windows - parser issue

[tempest]

tempest  added the comment:

But for course! (Slaps forehead!)

Yes, giving the Windows path as a raw string works. For all the times I've done 
'\t'.join(str(f) for f in some_array) to get a tab-delimited text string, I 
should have had a clue. Sorry for the noise, and thanks for setting me straight.

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[issue38817] Immutable types inplace operations work incorrect in async

[Andrew Svetlov]

Andrew Svetlov  added the comment:

Raymond correctly spotted the problem.

I think we should just close the issue.

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

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[issue38021] Modify AIX platform_tag so it provides PEP425 needs

[Michael Felt]

Michael Felt  added the comment:

Updated this PR, and PRs in pypa/pip and pypa/packaging to all be "in sync".

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[issue38021] Modify AIX platform_tag so it provides PEP425 needs

[Michael Felt]

Change by Michael Felt :


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title: pep425 tag for AIX is inadequate -> Modify AIX platform_tag so it 
provides PEP425 needs

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[issue26730] SpooledTemporaryFile rollover corrupts data silently when Unicode characters are written

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan  added the comment:

> Note that the _file attribute may be TextIOWrapper after rollover() anyway 
> and the rollover() may be called implicitly.
The code depending on the specific type of the _file is fragile at first.

Okay, thanks for the detail.

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[issue38933] unusual behaviour on list of dependable lambdas

[Vedran Čačić]

Vedran Čačić  added the comment:

Yes, I never really understood what problem people have with it. If I manually 
say

i = 0
f = lambda a: a[i]
i = 1
g = lambda a: a[i]

why does anyone expect functions f and g to be different? They have the same 
argument, and do the same thing with it. The bytecode is completely the same. 
How can they do different things?

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