[issue29571] test_re is failing when local is set for `en_IN`

[Nick Coghlan]

Nick Coghlan added the comment:

I'm with Serhiy on this one: if the "re" module isn't using 
locale.getpreferredencoding(), then there's something odd going on.

It just sounds like the disconnect on Windows is the opposite of the one we hit 
on Linux without Benjamin's patch, perhaps due to the UTF-8 mode changes - it 
wouldn't surprise me to learn that the re module is still using mbcs there 
instead of utf-8.

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[issue29714] can't interpolate byte string with \x00 before replacement identifier

[Xiang Zhang]

Changes by Xiang Zhang :


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[issue29571] test_re is failing when local is set for `en_IN`

[Benjamin Peterson]

Benjamin Peterson added the comment:

getpreferredencoding() takes a completely different path on windows
(returns a codepage) and isn't related to the C locale.

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[issue29571] test_re is failing when local is set for `en_IN`

[Benjamin Peterson]

Benjamin Peterson added the comment:

But the test was never broken on windows.

On Sun, Mar 5, 2017, at 23:54, Serhiy Storchaka wrote:
> 
> Serhiy Storchaka added the comment:
> 
> I'm not sure this will help on Windows.
> 
> --
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[issue29571] test_re is failing when local is set for `en_IN`

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

And I don't understand why my fix doesn't work on Windows.

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[issue29571] test_re is failing when local is set for `en_IN`

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I'm not sure this will help on Windows.

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[issue29571] test_re is failing when local is set for `en_IN`

[Benjamin Peterson]

Benjamin Peterson added the comment:

Yep, I think we should merge https://github.com/python/cpython/pull/422 and 
revert ncoghlan's change.

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[issue5945] PyMapping_Check returns 1 for lists

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Proposed wording doesn't looks much informative to me. Maybe just say that 
PyMapping_Check() also returns 1 for sequences that support slicing? And 
recommend `PyMapping_Check() && !PySequence_Check()` for true mapping test?

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[issue13566] Increase pickle compatibility

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


Added file: http://bugs.python.org/file46703/pickle-old-strings-2.patch

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[issue29690] no %z directive for strptime in python2, doc says nothing about it

[Mathieu Dupuy]

Mathieu Dupuy added the comment:

Neither documentation is clear on whether each of those flags are available for 
strptime too. A precision should be added on a flag if it's not available for 
strptime. What do you think ?

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Re: Who still supports recent Python on shared hosting

[Paul Rubin]

John Nagle  writes:
> I'm looking for shared hosting that supports at least Python 3.4.

Open a ticket on buyshared.net and ask if they can install it for you.
They're good about stuff like that.

If it's for a cgi, you might alternatively be able to run it from your
own directory (you get ssh access which gives some flexibility).
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Re: Who still supports recent Python on shared hosting

[Pete Forman]

John Nagle  writes:

> I'm looking for shared hosting that supports
> at least Python 3.4.
>
> Hostgator: Highest version is Python 3.2.
> Dreamhost: Highest version is Python 2.7.
> Bluehost: Install Python yourself.
> InMotion: Their documentation says 2.6.
>
> Is Python on shared hosting dead?
> I don't need a whole VM and something I
> have to sysadmin, just a small shared
> hosting account.

I use OpenShift from Red Hat on their free hosting package. They offer
Python 3.5, 3.3 and 2.7.

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[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

[Ivan Levkivskyi]

Changes by Ivan Levkivskyi :


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[issue29695] Weird keyword parameter names in builtins

[Raymond Hettinger]

Raymond Hettinger added the comment:

I do think it would be better to not have the deprecation.

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[issue29695] Weird keyword parameter names in builtins

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I already merged the patch as 58d23e68068996c76cac78887ec67dee68cdbc72.

If you think that it would be better to remove without deprecation, the 
following patch does this.

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Re: Who still supports recent Python on shared hosting

[D'Arcy Cain]

On 2017-03-05 09:39 PM, John Nagle wrote:

I'm looking for shared hosting that supports
at least Python 3.4.


http://www.VybeNetworks.com/

We have Python 2.7 and 3.6 installed.

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Re: str.title() fails with words containing apostrophes

[D'Arcy Cain]

On 2017-03-05 03:40 PM, Terry Reedy wrote:

import re

def title(string):
return re.sub(r"\b'\w", lambda m: m.group().lower(), string.title())


Nice.  It lowercases a word char that follows an "'" that follows a word
without an intervening non-word char. It passes this test:
print(title("'time' isn't 'timeless'!"))
'Time' Isn't 'Timeless'!

It guess the reason not to bake this exception into str.title is that it
is language specific and could even be wrong if someone used "'" to
separate words (perhaps in a different alphabet).


Or, it doesn't handle exceptions.

print title("My name is D'Arcy")

Oops.

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[issue29731] Ability to filter warnings to print current stack

[Matthias Bussonnier]

Changes by Matthias Bussonnier :


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[issue5945] PyMapping_Check returns 1 for lists

[Mariatta Wijaya]

Changes by Mariatta Wijaya :


--
stage: needs patch -> patch review
versions:  -Python 3.4

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[issue29571] test_re is failing when local is set for `en_IN`

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
components: +Windows
nosy: +paul.moore, steve.dower, tim.golden
resolution: fixed -> 
stage: resolved -> 
status: closed -> open

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[issue29730] unoptimal calls to PyNumber_Check

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
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[issue24329] __qualname__ and __slots__

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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[issue29731] Ability to filter warnings to print current stack

[Matthias Bussonnier]

New submission from Matthias Bussonnier:

The warning module is extremely useful, especially the ability to change 
various level of verbosity and filter by multiple criteria. 

It is though sometime hard to pinpoint why a warning was triggered, or actually 
what triggered a warning. This is often due to the fact that libraries don't 
set the `stacklevel=...`  correctly, that it is hard to get right (like at 
import time), or because warnings get triggered by complex, not obvious 
codepaths.

One workaround is to switch from `always`/`once` to "error" to raise 
exceptions, but that can be quite troublesome in production, if other warnings 
are encountered in the meantime.


Would it be accepted to add a warning filter type "stack" (or whatever name 
please you ...) that would not only print the current warning,  but the stack 
leading to it. That is to say output almost identical as "error" but not 
actually raising ?

Assuming above is reasonable, I have a working patch (both in the c and py 
implementation of warnings), though it can't seem to find how respect the 
`stacklevel=...` parameter unless `warn_explicit` is changed to allow an 
additional `frame` argument. Would adding this field be acceptable ?
Or arguably, if one is interested in the stack, ignoring the stacklevel may 
make sens as one may want to explore the full reason of the warning (ie its 
source that may be hidden by stacklevel=... ) , and not only what triggered it.

--
components: Library (Lib)
messages: 289066
nosy: mbussonn
priority: normal
severity: normal
status: open
title: Ability to filter warnings to print current stack
type: enhancement
versions: Python 3.7

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[issue29714] can't interpolate byte string with \x00 before replacement identifier

[Xiang Zhang]

Xiang Zhang added the comment:

The problem is now _PyBytes_FormatEx uses strchr to sniff %. It should use 
memchr instead.

--
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nosy: +xiang.zhang

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[issue29657] os.symlink: FileExistsError shows wrong message

[Xiang Zhang]

Xiang Zhang added the comment:

I agree with Eryk. The error message is misleading. When I see it, I take it as 
source -> destination. I think we should make the error message clearer, or 
document it in the OSError documentation.

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[issue15290] setAttribute() can fail

[Craig Rodrigues]

Craig Rodrigues added the comment:

Same issue was brought up in http://bugs.python.org/issue4851

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Re: Who still supports recent Python on shared hosting

[Chris Angelico]

On Mon, Mar 6, 2017 at 1:39 PM, John Nagle  wrote:
> I'm looking for shared hosting that supports
> at least Python 3.4.
>
> Hostgator: Highest version is Python 3.2.
> Dreamhost: Highest version is Python 2.7.
> Bluehost: Install Python yourself.
> InMotion: Their documentation says 2.6.
>
> Is Python on shared hosting dead?
> I don't need a whole VM and something I
> have to sysadmin, just a small shared
> hosting account.

Heroku supports a number of Python versions:

https://devcenter.heroku.com/articles/python-support#supported-python-runtimes

I'm not sure how to list *every* supported Python version (the docs
only list the latest 2.7 and the latest 3.x at any given time), but I
poked around in https://lang-python.s3.amazonaws.com/ and found a
large number of versions that appear to be installable. You specify a
version with a file in your repository called "runtime.txt", and
they'll give you that version if they can, or kick back an error.

ChrisA
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Who still supports recent Python on shared hosting

[John Nagle]

I'm looking for shared hosting that supports
at least Python 3.4.

Hostgator: Highest version is Python 3.2.
Dreamhost: Highest version is Python 2.7.
Bluehost: Install Python yourself.
InMotion: Their documentation says 2.6.

Is Python on shared hosting dead?
I don't need a whole VM and something I
have to sysadmin, just a small shared
hosting account.

John Nagle
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[issue24329] __qualname__ and __slots__

[Xiang Zhang]

Xiang Zhang added the comment:

PR made. :-)

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[issue24329] __qualname__ and __slots__

[Xiang Zhang]

Changes by Xiang Zhang :


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[issue29719] "Date" of what's new is confusing

[Ned Deily]

Ned Deily added the comment:

Heh, it looks like we agree!

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[issue29719] "Date" of what's new is confusing

[INADA Naoki]

INADA Naoki added the comment:

I'm sorry, I was wrong.

https://docs.python.org/3.5/whatsnew/3.5.html

asyncio has "Updates in 3.5.1:" section.
provisional package will introduce updates in what's new in bugfix release.

So is it OK to just removing Date and Release field?
"Date (when this HTML is built)" and "Release (of branch this page is built)" 
are not good for "What's New In 3.6" page.

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[issue29719] "Date" of what's new is confusing

[Ned Deily]

Ned Deily added the comment:

> Additonally, unlike "changelog", "What's New" only shows difference between 
> 3.5 and 3.6.  It won't be updated to describe changes between 3.6.0 and 3.6.1.

That's not always true.  There are occasionally changes made in the What's New 
document for maintenance releases.  See, for example, 
https://docs.python.org/3.5/whatsnew/3.5.html.  You'll find references to 3.5.1 
and 3.5.2 there.

If it's truly bothering people, a better solution is to just remove the release 
and date directives.  They aren't there for earlier releases.  We can live 
without them.

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[issue4851] xml.dom.minidom.Element.cloneNode fails with AttributeError

[Craig Rodrigues]

Craig Rodrigues added the comment:

This looks like a duplicate of https://bugs.python.org/issue15290 .

15290 was closed as invalid, and the submitter was told that the
code should be changed to not rely on creating elements outside
of the document interface.

I encountered the same problem when trying to port Twisted to Python 3.

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[issue29719] "Date" of what's new is confusing

[INADA Naoki]

INADA Naoki added the comment:

Additonally, unlike "changelog", "What's New" only shows difference between 3.5 
and 3.6.  It won't be updated to describe changes between 3.6.0 and 3.6.1.

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[issue29719] "Date" of what's new is confusing

[INADA Naoki]

INADA Naoki added the comment:

https://docs.python.org/3.7/whatsnew/3.6.html shows:
Release:3.7.0a0
Date:   February 15, 2017

Is it make sense for you?

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[issue29719] "Date" of what's new is confusing

[Ned Deily]

Ned Deily added the comment:

Sorry, I disagree.  I think the point of adding these directives is that shows 
for what release of 3.6.x they apply.  It is expected that the What's New 
documents may be updated during the lifecycle of a major release and having the 
release and date there lets the reader know that they are update.  For example, 
at the moment https://docs.python.org/3.6/whatsnew/3.6.html shows:

What’s New In Python 3.6
Release:3.6.1rc1
Date:   March 05, 2017

which is correct.

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Re: Online Python Editor with Live Syntax Checking

[Jason Friedman]

>
> I made a tool called PythonBuddy (http://pythonbuddy.com/).
>
> I made this so that MOOCs like edX or codecademy could easily embed and
> use this on their courses so students wouldn't have to go through the
> frustrations of setting up a Python environment and jump right into Python
> programming. Also, professors and teachers could easily set up a server and
> allow students to quickly test out their code with PythonBuddy online.
>
> Github repo: https://github.com/ethanche…/OnlinePythonLinterSyntaxChecker
>

Pretty cool.

Your Github link did not work for me.

This looks like Python 2.  Is there a reason you did not go with 3?
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[issue29571] test_re is failing when local is set for `en_IN`

[Zachary Ware]

Zachary Ware added the comment:

This seems to have broken test_re on Windows, see 
https://ci.appveyor.com/project/python/cpython/build/3.7.0a0.1

I found this change to be the culprit via git bisect, unfortunately we didn't 
have any working CI on Windows (buildbots were otherwise broken) at the time 
this was merged.

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[issue29723] 3.6.1rc1 adds the current directory to sys.path when running a subdirectory's __main__.py; previous versions did not

[Eryk Sun]

Eryk Sun added the comment:

> I don't have a specific problem that it causes. 

Adding an arbitrary directory ahead of the standard library in sys.path is a 
problem waiting to happen. This also happens when the import source is a zip 
file, e.g. a .pyz app.

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[issue29719] "Date" of what's new is confusing

[INADA Naoki]

Changes by INADA Naoki :


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[issue29695] Weird keyword parameter names in builtins

[Raymond Hettinger]

Raymond Hettinger added the comment:

I concur with Victor and Serhiy that we can bypass a deprecation phase here and 
just get it done.  In the rare case of int(x=3.14), the fix is trivial.

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[issue29730] unoptimal calls to PyNumber_Check

[Raymond Hettinger]

Raymond Hettinger added the comment:

+1 for removing each of these calls to PyNumber_Check.

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[issue29726] test_xmlrpc raises DeprecationWarnings

[dillon.brock]

dillon.brock added the comment:

The cherry-pick is causing a merge conflict because 3.6 and 3.5 do not include 
the SimpleXMLRPCDispatcherTestCase that this fix modifies. Should I backport 
that entire test case as well as the fix?

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[issue29723] 3.6.1rc1 adds the current directory to sys.path when running a subdirectory's __main__.py; previous versions did not

[Ned Batchelder]

Ned Batchelder added the comment:

I don't have a specific problem that it causes. It's just a difference from any 
previous CPython version.

About the PyPy thing: it has always behaved this way:

$ for ver in 4.0.1 5.1.1 5.4.0 5.6.0; do 
py=/usr/local/pythonz/pythons/PyPy-$ver/bin/pypy; $py -V; $py main361; done
Python 2.7.10 (5f8302b8bf9f, Nov 18 2015, 10:38:03)
[PyPy 4.0.1 with GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)]
['main361',
 '/Users/ned/foo',
 '/usr/local/pythonz/pythons/PyPy-4.0.1/lib_pypy/__extensions__',
 '/usr/local/pythonz/pythons/PyPy-4.0.1/lib_pypy',
 '/usr/local/pythonz/pythons/PyPy-4.0.1/lib-python/2.7',
 '/usr/local/pythonz/pythons/PyPy-4.0.1/lib-python/2.7/lib-tk',
 '/usr/local/pythonz/pythons/PyPy-4.0.1/lib-python/2.7/plat-darwin',
 '/usr/local/pythonz/pythons/PyPy-4.0.1/lib-python/2.7/plat-mac',
 
'/usr/local/pythonz/pythons/PyPy-4.0.1/lib-python/2.7/plat-mac/lib-scriptpackages',
 '/usr/local/pythonz/pythons/PyPy-4.0.1/site-packages']
Python 2.7.10 (b0a649e90b66, Apr 28 2016, 08:33:07)
[PyPy 5.1.1 with GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)]
['main361',
 '/Users/ned/foo',
 '/usr/local/pythonz/pythons/PyPy-5.1.1/lib_pypy/__extensions__',
 '/usr/local/pythonz/pythons/PyPy-5.1.1/lib_pypy',
 '/usr/local/pythonz/pythons/PyPy-5.1.1/lib-python/2.7',
 '/usr/local/pythonz/pythons/PyPy-5.1.1/lib-python/2.7/lib-tk',
 '/usr/local/pythonz/pythons/PyPy-5.1.1/lib-python/2.7/plat-darwin',
 '/usr/local/pythonz/pythons/PyPy-5.1.1/lib-python/2.7/plat-mac',
 
'/usr/local/pythonz/pythons/PyPy-5.1.1/lib-python/2.7/plat-mac/lib-scriptpackages',
 '/usr/local/pythonz/pythons/PyPy-5.1.1/site-packages']
Python 2.7.10 (77392ad26350, Aug 28 2016, 05:07:44)
[PyPy 5.4.0 with GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)]
['main361',
 '/Users/ned/foo',
 '/usr/local/pythonz/pythons/PyPy-5.4.0/lib_pypy/__extensions__',
 '/usr/local/pythonz/pythons/PyPy-5.4.0/lib_pypy',
 '/usr/local/pythonz/pythons/PyPy-5.4.0/lib-python/2.7',
 '/usr/local/pythonz/pythons/PyPy-5.4.0/lib-python/2.7/lib-tk',
 '/usr/local/pythonz/pythons/PyPy-5.4.0/lib-python/2.7/plat-darwin',
 '/usr/local/pythonz/pythons/PyPy-5.4.0/lib-python/2.7/plat-mac',
 
'/usr/local/pythonz/pythons/PyPy-5.4.0/lib-python/2.7/plat-mac/lib-scriptpackages',
 '/usr/local/pythonz/pythons/PyPy-5.4.0/site-packages']
Python 2.7.12 (aff251e54385, Nov 09 2016, 17:25:49)
[PyPy 5.6.0 with GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)]
['main361',
 '/Users/ned/foo',
 '/usr/local/pythonz/pythons/PyPy-5.6.0/lib_pypy/__extensions__',
 '/usr/local/pythonz/pythons/PyPy-5.6.0/lib_pypy',
 '/usr/local/pythonz/pythons/PyPy-5.6.0/lib-python/2.7',
 '/usr/local/pythonz/pythons/PyPy-5.6.0/lib-python/2.7/lib-tk',
 '/usr/local/pythonz/pythons/PyPy-5.6.0/lib-python/2.7/plat-darwin',
 '/usr/local/pythonz/pythons/PyPy-5.6.0/lib-python/2.7/plat-mac',
 
'/usr/local/pythonz/pythons/PyPy-5.6.0/lib-python/2.7/plat-mac/lib-scriptpackages',
 '/usr/local/pythonz/pythons/PyPy-5.6.0/site-packages']
$ for ver in 2.4.0 5.5.0; do 
py=/usr/local/pythonz/pythons/PyPy3-$ver/bin/pypy3; $py -V; $py main361; done
Python 3.2.5 (b2091e973da6, Oct 19 2014, 18:30:58)
[PyPy 2.4.0 with GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.51)]
['main361',
 '/Users/ned/foo',
 '/usr/local/pythonz/pythons/PyPy3-2.4.0/lib_pypy/__extensions__',
 '/usr/local/pythonz/pythons/PyPy3-2.4.0/lib_pypy',
 '/usr/local/pythonz/pythons/PyPy3-2.4.0/lib-python/3',
 '/usr/local/pythonz/pythons/PyPy3-2.4.0/lib-python/3/lib-tk',
 '/usr/local/pythonz/pythons/PyPy3-2.4.0/lib-python/3/plat-darwin',
 '/usr/local/pythonz/pythons/PyPy3-2.4.0/lib-python/3/plat-mac',
 
'/usr/local/pythonz/pythons/PyPy3-2.4.0/lib-python/3/plat-mac/lib-scriptpackages',
 '/usr/local/pythonz/pythons/PyPy3-2.4.0/site-packages']
Python 3.3.5 (619c0d5af0e5, Oct 08 2016, 22:08:19)
[PyPy 5.5.0-alpha0 with GCC 4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)]
['main361',
 '/Users/ned/foo',
 '/usr/local/pythonz/pythons/PyPy3-5.5.0/lib_pypy/__extensions__',
 '/usr/local/pythonz/pythons/PyPy3-5.5.0/lib_pypy',
 '/usr/local/pythonz/pythons/PyPy3-5.5.0/lib-python/3',
 '/usr/local/pythonz/pythons/PyPy3-5.5.0/lib-python/3/lib-tk',
 '/usr/local/pythonz/pythons/PyPy3-5.5.0/lib-python/3/plat-darwin',
 '/usr/local/pythonz/pythons/PyPy3-5.5.0/lib-python/3/plat-mac',
 
'/usr/local/pythonz/pythons/PyPy3-5.5.0/lib-python/3/plat-mac/lib-scriptpackages',
 '/usr/local/pythonz/pythons/PyPy3-5.5.0/site-packages']
$

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[issue29730] unoptimal calls to PyNumber_Check

[Oren Milman]

New submission from Oren Milman:

 current state 
if (PyNumber_Check(obj)) {
someVar = PyNumber_AsSsize_t(obj, SomeError);
if (someVar == -1 && PyErr_Occurred()) {
return errVal;
}
}
else {
PyErr_Format(PyExc_TypeError,
 "integer argument expected, got '%.200s'",
 Py_TYPE(obj)->tp_name);
return errVal;
}

Something similar to this happens in:
- Modules/mmapmodule.c in mmap_convert_ssize_t
- Modules/_io/_iomodule.c in _PyIO_ConvertSsize_t
- Modules/_io/stringio.c in:
* _io_StringIO_read_impl
* _io_StringIO_readline_impl
* _io_StringIO_truncate_impl

(Moreover, in:
- Objects/bytes_methods.c in parse_args_finds_byte
- Objects/exceptions.c in oserror_init
PyNumber_AsSsize_t is called only if PyNumber_Check returns true.)

Note that:
- PyNumber_Check checks whether nb_int != NULL or nb_float != NULL.
- PyNumber_AsSsize_t calls PyNumber_Index, which, before calling
  nb_index, raises a TypeError (with a similar error message) in case
  nb_index == NULL.
- The docs say '... when __index__() is defined __int__() should also be
  defined ...'.
So the behavior with and without the call to PyNumber_Check is quite the same.
The only potential advantage of calling PyNumber_Check is skipping the call to
PyNumber_AsSsize_t.
But PyNumber_AsSsize_t would be called also in case
nb_index == NULL and (nb_int != NULL or nb_float != NULL).
Thus, the only case in which the call to PyNumber_Check might be useful, is
when nb_int == nb_float == nb_index == NULL.


 proposed changes 
Either remove each of these calls to PyNumber_Check, or at least replace it
with a call to PyIndex_Check, which checks whether nb_index != NULL, and thus
would be more useful than PyNumber_Check.

Note that such a change shouldn't affect the behavior, except for a slightly
different wording of the error message in case a TypeError is raised.

--
components: IO
messages: 289048
nosy: Oren Milman
priority: normal
severity: normal
status: open
title: unoptimal calls to PyNumber_Check
type: enhancement
versions: Python 3.7

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[issue29104] Left bracket remains in format string result when '\' preceeds it

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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[issue28682] Bytes support in os.fwalk()

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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Re: How to access installed scripts on Windows?

[eryk sun]

On Sun, Mar 5, 2017 at 2:35 AM, ddbug  wrote:
>
>> You can also develop using venv virtual environments. You can symlink
>> or shell-shortcut to the activation script of a virtual environment.
>
> Interesting idea. But I have not seen any installers or guidance how to 
> deploy something packaged
> as a venv to users. Can you share any pointers please?

Are we talking about scripts for programmers to work with libraries
that you publish (e.g. a command-line tool like cythonize), or
applications for end users and IT staff? Virtual environments are
primarily a solution for developers. For deployment to end users, take
a look at what Paul Moore is doing with pylaunch and the embedded
Python distribution:

https://github.com/pfmoore/pylaunch
https://docs.python.org/3/using/windows.html#embedded-distribution
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[issue29196] Remove old-deprecated plistlib features

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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[issue29729] UUID bytes constructor has too-tight an assertion

[Barry A. Warsaw]

Changes by Barry A. Warsaw :


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[issue28749] Fixed the documentation of the mapping codec APIs

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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[issue29723] 3.6.1rc1 adds the current directory to sys.path when running a subdirectory's __main__.py; previous versions did not

[Eryk Sun]

Eryk Sun added the comment:

That's not the current directory. It's the 'script' directory (i.e. the parent 
of main361), as set by PySys_SetArgv when Py_IsolatedFlag isn't set. 

The old behavior was for RunMainFromImporter to unconditionally replace this 
directory in sys.path with the import source for "__main__.py", which is the 
correct behavior, except I think it should try to get an absolute path. The 
resolution for #29319 changed this such that when sys.path[0] is non-empty it 
now inserts the import source at index 0 rather than replace index 0. It seems 
to me that this new logic should only be used in isolated mode. Otherwise it 
should be replacing this bogus script directory like it used to.

--
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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[STINNER Victor]

STINNER Victor added the comment:

> Victor will probably tell me I'm micro-benchmarking this the wrong way,
so to satisfy him I did one more run:

You are doing it the wrong way :-D Please replace Timeit(...) with
runner=perf.Runner() and then runner.timeit('bench1', ...).

Runner spaws multiples processes and then test if a comparison is
significant (perf compare_to a.json b.json).

Moreover, for microbenchmaks, I highly recommand to tune your system for
benchmarks: python3 -m perf system tune, and see also perf doc ;-)

5% is not significant on a microbenchmark, it can be pure noise.

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[issue29695] Weird keyword parameter names in builtins

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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[issue24037] Argument Clinic: add the boolint converter

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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[issue29645] webbrowser module import has heavy side effects

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


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Re: str.title() fails with words containing apostrophes

[Terry Reedy]

On 3/5/2017 2:38 PM, MRAB wrote:

On 2017-03-05 17:54, Steve D'Aprano wrote:

I'm trying to convert strings to Title Case, but getting ugly results
if the
words contain an apostrophe:


py> 'hello world'.title()  # okay
'Hello World'
py> "i can't be having with this".title()  # not okay
"I Can'T Be Having With This"


Anyone have any suggestions for working around this?


A bit of regex?

import re

def title(string):
return re.sub(r"\b'\w", lambda m: m.group().lower(), string.title())


Nice.  It lowercases a word char that follows an "'" that follows a word 
without an intervening non-word char. It passes this test:

print(title("'time' isn't 'timeless'!"))
'Time' Isn't 'Timeless'!

It guess the reason not to bake this exception into str.title is that it 
is language specific and could even be wrong if someone used "'" to 
separate words (perhaps in a different alphabet).


--
Terry Jan Reedy

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[issue29728] Expose TCP_NOTSENT_LOWAT

[Mariatta Wijaya]

Changes by Mariatta Wijaya :


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versions: +Python 3.7

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[issue29728] Expose TCP_NOTSENT_LOWAT

[Nathaniel Smith]

Changes by Nathaniel Smith :


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[issue29729] UUID bytes constructor has too-tight an assertion

[Nic Watson]

New submission from Nic Watson:

The assertion:

  File "/usr/lib/python3.6/uuid.py", line 150, in __init__
assert isinstance(bytes, bytes_), repr(bytes)

is too specific (and IMHO, unpythonic).  One may want to pass a bytearray or a 
memoryview.  See int.from_bytes for an example that takes "bytes" but accepts 
anything that acts like a bytes.

A simple solution may be to delete the assertion (it worked for me).

Example code:

import uuid

b = uuid.uuid1().bytes
ba = bytearray(b)
print(uuid.UUID(bytes=b))

# another API that works similarly, accepts a bytearray
print(int.from_bytes(ba, byteorder='big'))

# fails on assertion
print(uuid.UUID(bytes=ba))

--
components: Extension Modules
messages: 289045
nosy: jnwatson
priority: normal
severity: normal
status: open
title: UUID bytes constructor has too-tight an assertion
type: behavior
versions: Python 3.6

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Re: str.title() fails with words containing apostrophes

[MRAB]

On 2017-03-05 17:54, Steve D'Aprano wrote:

I'm trying to convert strings to Title Case, but getting ugly results if the
words contain an apostrophe:


py> 'hello world'.title()  # okay
'Hello World'
py> "i can't be having with this".title()  # not okay
"I Can'T Be Having With This"


Anyone have any suggestions for working around this?


A bit of regex?

import re

def title(string):
return re.sub(r"\b'\w", lambda m: m.group().lower(), string.title())

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[issue29723] 3.6.1rc1 adds the current directory to sys.path when running a subdirectory's __main__.py; previous versions did not

[Ned Deily]

Ned Deily added the comment:

I think this is a result of the changes introduced with Issue29319.  Perhaps a 
more prominent NEWS entry is needed?  Nick?  Ned, does this change in behavior 
cause problems?

--
nosy: +ncoghlan, ned.deily

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[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

[Raymond Hettinger]

Raymond Hettinger added the comment:

One other thought:  array.array() object should probably be registered so that 
it recognizable as a Sequence and as Reversible.

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[issue29638] Spurious failures in test_collections in releak hunting mode after typing is imported

[Ivan Levkivskyi]

Changes by Ivan Levkivskyi :


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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Raymond Hettinger]

Raymond Hettinger added the comment:

Additional note:  For folks interested in performance, it is common for people 
not to realize that function call overhead can dominate their timings (see this 
recent SO question as a recent, but typical example 
http://stackoverflow.com/questions/41772054 ).

In any case, the note needs to remain because people commonly move these 
recipes into production code and need to be warned that basic optimizations 
were skipped.  This is important in a module where improved performance is one 
of the primary goals.

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[issue29728] Expose TCP_NOTSENT_LOWAT

[Nathaniel Smith]

New submission from Nathaniel Smith:

https://github.com/python/cpython/pull/477

--
components: Library (Lib)
messages: 289041
nosy: njs
priority: normal
severity: normal
status: open
title: Expose TCP_NOTSENT_LOWAT

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[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

[Raymond Hettinger]

Raymond Hettinger added the comment:

I don't think this is a bug.  The purpose collections.abc.Reversible is to 
recognize type where the behavior has been guaranteed, not to recognize all 
types where it happens to work.

Part of the original reason for introducing ABCs in the first place was that in 
general there is no reliable way to detect whether a class defining __getitem__ 
is a sequence or a mapping.

A creator of such a class either needs to subclass from Sequence or register as 
a Sequence.  The fact that reversed(Counter(10)) happens to work is no more 
interesting that the fact Counter(10)[5] happens to work eventhough 
isinstance(Counter, Sequence) returns False.

--
assignee:  -> rhettinger

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[issue29638] Spurious failures in test_collections in releak hunting mode after typing is imported

[Ivan Levkivskyi]

Changes by Ivan Levkivskyi :


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[issue29727] collections.abc.Reversible doesn't fully support the reversing protocol

[Serhiy Storchaka]

New submission from Serhiy Storchaka:

collections.abc.Reversible doesn't work with types that are supported by 
reserved() but neither have the __reversed__ method nor are explicitly 
registered as collections.abc.Sequence. For example:

>>> issubclass(array.array, collections.abc.Reversible)
False 

The reversing protocol as well as the iterating protocol is supported not only 
by special method, but implicitly if the class has implemented __getitem__ and 
__len__ methods.

>>> class Counter(int):
...   def __getitem__(s, i): return i
...   def __len__(s): return s
... 
>>> list(reversed(Counter(10)))
[9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
>>> issubclass(Counter, collections.abc.Reversible)
False

typing.Reversible starves from the same bug. See 
https://github.com/python/typing/issues/170.

--
components: Library (Lib)
messages: 289039
nosy: gvanrossum, rhettinger, serhiy.storchaka, stutzbach
priority: normal
severity: normal
status: open
title: collections.abc.Reversible doesn't fully support the reversing protocol
type: behavior
versions: Python 3.6, Python 3.7

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Raymond Hettinger]

Raymond Hettinger added the comment:

The reason that this comment was added was to note the recipes themselves are 
unoptimized and to provide some guideance on how that could be done.  The 
recipes themselves are provided in the cleaner looking form.

FWIW, localizing variables is one of the few code optimizations available to 
python programmers.  It is not uncommon in the standard library eventhough 
there are some people who just don't like it (including apparently the OP).

Sorry Chris, I'm going to reject this.  The note is correct, the optimization 
is valid, and so is the original purpose for adding it.

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

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Raymond Hettinger]

Changes by Raymond Hettinger :


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[issue29638] Spurious failures in test_collections in releak hunting mode after typing is imported

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

> Seems this has fixed issue25744.

This is interesting, if I remember correctly the relevant typing classes were 
added only recently. I will take a look at how to back-port this (probably this 
will require some code changes)

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[issue29638] Spurious failures in test_collections in releak hunting mode after typing is imported

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you Ivan! Seems this has fixed issue25744. Don't you mind to backport 
your changes to 3.6 and 3.5?

--
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[issue25744] Reference leaks in test_collections

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Closed in favor of issue29638. The latter has a patch.

--
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> Spurious failures in test_collections in releak hunting mode 
after typing is imported

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I have got 15% speed up.

But two of my variants (the first and the second) speed up the calculation by 
2.8 and 3.6 times correspondingly. It doesn't make sense to talk about 
microoptimization of the example if rewriting it without using iterator tools 
can get much larger speed up.

The example still is good for the case when use vectors of large dimensions. 
But in that case the effect of the microoptimization is dwarfed by the time of 
iteration and calculation.

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[issue27476] Introduce a .github folder with PULL_REQUEST_TEMPLATE

[Senthil Kumaran]

Changes by Senthil Kumaran :


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

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[issue27476] Introduce a .github folder with PULL_REQUEST_TEMPLATE

[Senthil Kumaran]

Senthil Kumaran added the comment:

The .github directory needs to stay and is being used for other purposes (like 
providing contributing guidelines 
(https://github.com/blog/1184-contributing-guidelines)).

The old pull request template has already been deleted:
https://github.com/python/cpython/commit/6f0eb93183519024cb360162bdd81b9faec97ba6

This bug can be closed IMO.

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str.title() fails with words containing apostrophes

[Steve D'Aprano]

I'm trying to convert strings to Title Case, but getting ugly results if the
words contain an apostrophe:


py> 'hello world'.title()  # okay
'Hello World'
py> "i can't be having with this".title()  # not okay
"I Can'T Be Having With This"


Anyone have any suggestions for working around this?



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[issue29638] Spurious failures in test_collections in releak hunting mode after typing is imported

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

> If you just want to add a workaround in dash_R_cleanup, I think it would be 
> better to generate the list of all abstract classes and add three typing 
> classes to it.

Yes, I just updated the PR.

I have found something else unrelated to typing, this test (in exactly this 
order):

./python -m test -R 5:5 test_abc test_functools

fails with a reproducible pattern:

test_functools leaked [0, 3, 1, 0, 0] memory blocks, sum=4

If you are happy with the PR now, we could open two separate issues for 
possible bug in inspect.isabstract and refleak in test_functools after 
test_abc. (the latter however might be potentially somehow related to abc 
caches)

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Leonid R.]

Leonid R. added the comment:

I think this is a "last resort" optimization and shouldn't be encouraged, 
especially in the official documentation. There are plenty of real 
optimizations you can do before doing micro-optimizations like this, and there 
is no reason it should be mentioned in the docs.

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Marc-Andre Lemburg]

Marc-Andre Lemburg added the comment:

The localization using keyword parameters is a very old trick to avoid global 
lookups. It does give a noticeable speedup, esp. when the localized variables 
are used in tight loops or the function itself is used in such loops.

The 5% speedup Steven measured matches my experience with this trick as well. 
In some cases, it can provide a more dramatic speedup, but this depends a lot 
on how the code is written.

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

How it comparing with

return vec1[0]*vec2[0]+vec1[1]*vec2[1]+vec1[2]*vec2[2]

and

x1, y1, z1 = vec1
x2, y2, z2 = vec2
return x1*x2+y1*y2+z1*z2

and

x1, y1, z1 = vec1
x2, y2, z2 = vec2
return sum(a*b for a, b in zip(vec1, vec2))

?

A 5% speed up may be not enough high for cluttering the educational example.

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Steven D'Aprano]

Steven D'Aprano added the comment:

On my computer, running Python 3.5 and continuing to do other tasks while the 
tests are running, I get a reproducible 5% speedup by using the "default 
values" trick. Here's my code:

import operator
def dotproduct(vec1, vec2):
return sum(map(operator.mul, vec1, vec2))

def dotproduct2(vec1, vec2, sum=sum, map=map, mul=operator.mul):
return sum(map(mul, vec1, vec2))

setup = 'from __main__ import a, b, dotproduct, dotproduct2'
from random import random as r
a = [[r(), r(), r()] for i in range(1)]
b = [[r(), r(), r()] for i in range(1)]
t1 = Timer('for v1, v2 in zip(a, b): dotproduct(v1, v2)', setup)
t2 = Timer('for v1, v2 in zip(a, b): dotproduct2(v1, v2)', setup)


I then ran and compared 

min(t1.repeat(number=200, repeat=10))
min(t2.repeat(number=200, repeat=10))

a few times while reading email and doing local editing of files. Normal 
desktop activity. Each time, t2 (the dotproduct with the micro-optimizations) 
was about 5% faster.

Victor will probably tell me I'm micro-benchmarking this the wrong way, so to 
satisfy him I did one more run:

py> import statistics
py> d1 = t1.repeat(number=200, repeat=10)
py> d2 = t2.repeat(number=200, repeat=10)
py>
py> statistics.mean(d1); statistics.stdev(d1)
5.277554708393291
0.15216686556059497
py> statistics.mean(d2); statistics.stdev(d2)
4.929395379964262
0.05397586490809523


So I'm satisfied that this trick gives a real, if small, speed up for at least 
the example given. YMMV.

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type:  -> performance

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[issue29726] test_xmlrpc raises DeprecationWarnings

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Thank you Dillon! Could you backport your changes to 3.6 and 3.5?

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[issue29726] test_xmlrpc raises DeprecationWarnings

[Serhiy Storchaka]

Changes by Serhiy Storchaka :


--
assignee:  -> serhiy.storchaka
nosy: +p...@motejlek.net, serhiy.storchaka
stage:  -> patch review
versions: +Python 3.5, Python 3.6

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[issue29726] test_xmlrpc raises DeprecationWarnings

[dillon.brock]

Changes by dillon.brock :


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[issue29726] test_xmlrpc raises DeprecationWarnings

[dillon.brock]

New submission from dillon.brock:

In 3 unit tests, test_xmlrpc calls assertRaises(Exception, 
expectedRegex='method'), causing DeprecationWarnings. These calls should be 
replaced with assertRaisesRegex(Exception, 'method').

0:20:56 [378/404] test_xmlrpc
127.0.0.1 - - [05/Mar/2017 11:53:45] "POST / HTTP/1.1" 200 -
127.0.0.1 - - [05/Mar/2017 11:53:45] "POST / HTTP/1.1" 200 -
/home/dillon/src/cpython/Lib/test/test_xmlrpc.py:430: DeprecationWarning: 
'expected_regex' is an invalid keyword argument for this function
  with self.assertRaises(Exception, expected_regex='method'):
/home/dillon/src/cpython/Lib/test/test_xmlrpc.py:423: DeprecationWarning: 
'expected_regex' is an invalid keyword argument for this function
  with self.assertRaises(Exception, expected_regex='method'):
/home/dillon/src/cpython/Lib/test/test_xmlrpc.py:415: DeprecationWarning: 
'expected_regex' is an invalid keyword argument for this function
  with self.assertRaises(Exception, expected_regex='method'):

--
components: Tests
messages: 289026
nosy: dillon.brock
priority: normal
severity: normal
status: open
title: test_xmlrpc raises DeprecationWarnings
type: behavior
versions: Python 3.7

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[issue29638] Spurious failures in test_collections in releak hunting mode after typing is imported

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I just wonder is there any other negative consequences? inspect.isabstract() 
returning False for abstract class looks a bug to me.

If you just want to add a workaround in dash_R_cleanup, I think it would be 
better to generate the list of all abstract classes and add three typing 
classes to it.

clear_caches() is called before running every test, but ABC caches are cleared 
not so often.

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Re: [RELEASE] Python 3.6.1rc1 is now available

[D'Arcy Cain]

On 2017-03-05 07:01 AM, Ned Deily wrote:

On behalf of the Python development community and the Python 3.6 release
team, I would like to announce the availability of Python 3.6.1rc1.
3.6.1rc1 is the first release candidate for Python 3.6.1, the first
maintenance release of Python 3.6.  3.6.0 was released on 2017-12-22


from __future__ import 3.6.0

Did Guido finally get that time machine working?

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Steven D'Aprano]

Changes by Steven D'Aprano :


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Re: [RELEASE] Python 3.6.1rc1 is now available

[D'Arcy Cain]

On 2017-03-05 07:01 AM, Ned Deily wrote:

On behalf of the Python development community and the Python 3.6 release
team, I would like to announce the availability of Python 3.6.1rc1.
3.6.1rc1 is the first release candidate for Python 3.6.1, the first
maintenance release of Python 3.6.  3.6.0 was released on 2017-12-22


from __future__ import 3.6.0

Did Guido finally get that time machine working?

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[issue20774] collections.deque should ship with a stdlib json serializer

[Raymond Hettinger]

Raymond Hettinger added the comment:

FWIW, one of the design goal for deques was to make them easily substitutable 
for lists when needed.  This feature request is a nice-to-have that moves us a 
little closer.

That said, I think a __json__ attribute is too big of a hammer for this simple 
proposal.

Also, please add Bob Ippolito to all JSON issues.  He has excellent design 
sensibilities and considerable contact with users of the json module.

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[issue29725] sqlite3.Cursor doesn't properly document "arraysize"

[Jürgen A . Erhard]

New submission from Jürgen A. Erhard:

It's an attribute mentioned in fetchmany and fetchall, but it's not in the list 
with those two, but it should be, since the section says "A Cursor instance has 
the following attributes and methods." and it is an attribute.

--
assignee: docs@python
components: Documentation
messages: 289023
nosy: docs@python, jae
priority: normal
severity: normal
status: open
title: sqlite3.Cursor doesn't properly document "arraysize"

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[issue20774] collections.deque should ship with a stdlib json serializer

[Raymond Hettinger]

Raymond Hettinger added the comment:

There is a difference.  An __json__ attribute would have to convert to a list 
first.  Adding support directly to the json module would allow the deque to be 
read directly.

I think you all are leaning towards premature generalization and making this 
harder than it needs to be.  Chris and Tarek's proposal is a reasonable and 
straight-forward, but it is not being pushed towards PEP territory and I think 
Guido would need to opine on whether to enshrine yet another dunder method that 
would infest the library and privilege the json serialization format over all 
formats.

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[issue29649] struct.pack_into check boundary error message ignores offset

[Andrew Nester]

Andrew Nester added the comment:

Thanks Serhiy! Just implemented new error messages in my PR for case you 
mentioned.

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[issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Chris Warrick]

New submission from Chris Warrick:

The itertools recipes list [0] ends with the following dubious advice:

> Note, many of the above recipes can be optimized by replacing global lookups 
> with local variables defined as default values. For example, the dotproduct 
> recipe can be written as:
>
> def dotproduct(vec1, vec2, sum=sum, map=map, mul=operator.mul):
> return sum(map(mul, vec1, vec2))

This is presented in the document without any explanation. It may confuse 
beginners into always doing it in their code (as evidenced in #python today), 
leading to unreadable code and function signatures. There is also no proof of 
there being a significant speed difference by using this “trick”. In my 
opinion, this should not be part of the documentation, or should provide proof 
that it can provide a real, noticeable speedup and is not premature 
optimization.

(Added in [1] by Raymond Hettinger — added to nosy list)

[0]: https://docs.python.org/3/library/itertools.html#itertools-recipes
[1]: 
https://github.com/python/cpython/commit/fc91aa28fd8dad5280fd4d3a4747b5e08ee37ac0

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components: Documentation
messages: 289020
nosy: Kwpolska, docs@python, rhettinger
priority: normal
severity: normal
status: open
title: Itertools docs propose a harmful “speedup” without any explanation
versions: Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7

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[issue29638] Spurious failures in test_collections in releak hunting mode after typing is imported

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

> What if explicitly set __abstractmethods__ = True for these types?

Unfortunately this does not help. I think this is because dash_R_cleanup only 
clears caches for classes in collections.abc.__all__ and their immediate 
.__subclasses__(). Making this recursive (i.e. also clearing caches of 
__subclasses__() of __subclasses__() etc) will probably fix the problem 
(provided we also add __abstractmethods__ = True). However, this looks a bit 
too complex for me. I would rather add few more typing._cleanups (anyway this 
failure only happens with typing ABCs)

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[issue29638] Spurious failures in test_collections in releak hunting mode after typing is imported

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

What if explicitly set __abstractmethods__ = True for these types?

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Re: list of the lists - append after search

[gvmcmt]

On Thursday, March 2, 2017 at 9:33:14 PM UTC+5:30, Andrew Zyman wrote:
> Hello,
>  please advise.
> 
>  I'd like search and append the internal list in the list-of-the-lists.
> 
> Example:
>  ll =[ [a,1], [b,2], [c,3], [blah, 1000] ]
> 
>  i want to search for the internal [] based on the string field and, if 
> matches, append that list with a value.
> 
>   if internal_list[0] == 'blah':
>   ll[ internal_list].append = [ 'new value']
> 
> End result:
>  ll =[ [a,1], [b,2], [c,3], [blah, 1000, 'new value'] ]
> 
> 
> I came up with the following, but the second stmnt is not correct:
> 
> print [x for x in ll if x[0]== 'blah']
> print ll.index([x for x in ll if x[0]=='blah'])
> 
> output:
> ValueError: [['blah', 1]] is not in list
> 
> 
> 
> 
> thank you
> AZ


list_of_lists = [['a', 1], ['b', 2], ['c', 3], ['blah', 1000]]

for sublist in list_of_lists:
if sublist[0] == 'blah':
sublist.append('new value')


Hope that helps.
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