that
we should hopefully be able to avoid misunderstanding each other.
There are probably other places where you could find mentions of this
in the docs but I just took a quick look in the Python 3.5 docs
(before hash randomisation) to find this mention of dictionary
iteration order:
https://docs.p
e. A
singleton class can have a hash function that matches identity based
equality without using id: any constant hash function will do.
--
Oscar
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You're right of course. Oh well, it *was* a wild idea.😁
Rob Cliffe
On 04/12/2
On 04/12/2022 18:16, Chris Angelico wrote:
On Mon, 5 Dec 2022 at 05:11, Rob Cliffe via Python-Dev
wrote:
Wild suggestion:
Make None.__hash__ writable.
E.g.
None.__hash__ = lambda : 0 # Curr
wrote:
On Thu, Dec 01, 2022 at 10:18:49PM +, Rob Cliffe via Python-Dev wrote:
Wild suggestion:
Make None.__hash__ writable.
E.g.
None.__hash__ = lambda : 0 # Currently raises AttributeError:
'NoneType' object attribute '__hash__' is read-only
You would have to
rammar for f-strings in Python by
adding f-strings directly into the Grammar instead of using a
two-pass hand-written parser.
* This would lift some existing restrictions for f-strings that (we
believe) will improve the user experience with f-strings.
* Other benefits include:
but
others will be mangled or missing text. This means you would still need to
maintain the Malman archive as the canonical source of truth. Once fixed,
not only would the [Python-Dev] archives be searchable within Discourse,
but they should also rank better in search than they do in
Why would "if not A" also be true when you repeat the current iteration? What
keeps this from becoming an endless loop?
Jan 26, 2023, 11:45 by thomasratzk...@outlook.de:
> Hi all,
>
> i would like to suggest the following Python feature. It naturally happens
> that on
Sent from my iPhone
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ed with an explanation text.
Something like "Cannot assign `i` because this name is already used as a comprehension's loop variable" would clarify what exactly they did
wrong.
I-am-the-Walrus-lyrics-won’t-help-you-at-all-ly y’rs,
-Barry
_____
s not use SyntaxError for something that's not an error
with the syntax.
(For reference the error messages are, depending a bit on the Python
version, respectively
object of type 'int' has no len()
len() takes exactly one argument (2 given)
len() takes no keyword arguments
> On 8 Aug 2019, at 17:42, Christian Tismer wrote:
>
> On 08.08.19 17:20, Ronald Oussoren via Python-Dev wrote:
>>
>>
>>> On 8 Aug 2019, at 17:12, Christian Tismer >> <mailto:tis...@stackless.com>> wrote:
>>>
>>> Hi Ronald,
&
not always obvious.
I suggest the only watertight definition of a syntax error is something
which raises
an exception at compile time. Obviously this can depend not only on the
code,
but also on the compiler.
Rob Cliffe
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On 06/08/2019 23:41:25, Greg Ewing wrote:
Rob Cliffe via Python-Dev wrote:
Sorry, that won't work. Strings are parsed at compile time, open()
is executed at run-time.
It could check for control characters, which are probably the result
of a backslash accident. Maybe even auto-co
directory.
[1]
https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getvolumeinformationw
[2]
https://docs.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getvolumenameforvolumemountpointw
If they're Windows developers, they ought to be aware that the Windows
file syste
On 10/08/2019 23:30:18, Greg Ewing wrote:
Rob Cliffe via Python-Dev wrote:
Also, the former is simply more *informative* - it tells the reader
that baz is expected to be a directory, not a file.
On Windows you can usually tell that from the fact that filenames
almost always have an
_____
I rather like the idea! (Even though it would add to the proliferation
of string types.)
Obviously Python can't use # as the special character since that
introduces a comment,
and a lot of other possibilities are excluded because they would lead to
ambiguous syn
Hi,
As a workaround it is possible to install Python by choosing “open” from the
context-menu of in the Finder instead of double clicking on the installer.
This is currently necessary because the macOS Catalina has stricter
requirements for signing installers, and the Python.org <h
Dear All,
Thank you very much for your quick responses - I’ve managed to install it via
Finder rather than clicking directly on the link in the downloads bar.
Many thanks,
Ana Simion
> On 16 Aug 2019, at 17:50, Ned Deily wrote:
>
> On Aug 16, 2019, at 06:11, Ronald Oussoren v
statements?Please
note that we need this information for our OSS clearance report.
Thank you, Mihaela
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.h and Modules/_hashopenssl.c in which a copyright notice correctly comes bare and is
followed by a license grant compatible with PSFLA.
--
Regards,
Ivan
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Is it possible to contact the contributors and have their explicit agreement
or is the LICENSE file at the top level of the repo already covering this
scenario?
Thank you,Mihaela
On Tuesday, August 20, 2019, 12:22:04 AM GMT+3, Ivan Pozdeev via Python-Dev
wrote:
On 19.08.2019 23:30
That's perfect! Thank you for clarifying this.
On Tuesday, August 20, 2019, 5:09:43 PM GMT+2, Guido van Rossum
wrote:
The LICENSE file at the top is all you need. There is no need to contact
inidividual contributors. That's the whole point of how Python licensing is set
u
where they would break out of the finally.
Their use in such a location silently cancels any active exception
being raised through the finally, leading to unclear code and possible
bugs.
Continue is currently not supported in a finally in Python 3.7 (due to
implementation issues) and the proposal is
second operation would also corrupt
output.
Came across this kind of set in the hyper http library which uses a set
to accept certain headers with either str or bytes keys.
Does that library support Python 2? If it is true than you have a
problem, because u'abc' == b'abc' i
fference to anyone's workflow.
-CHB
On Fri, Sep 13, 2019 at 6:39 PM Sumana Harihareswara
wrote:
> Hi. I've joined python-dev to participate in this thread (I don't have
> email delivery turned on; I'll be checking back via the web).
>
> Benjamin, I am sorry that I di
Peter, I think that went just to me, which I suspect was not what you
intended, so I've brought it back on the list:
On Tue, Sep 17, 2019 at 12:06 PM Peter Wang wrote:
> On Mon, Sep 16, 2019 at 5:55 PM Chris Barker via Python-Dev <
> python-dev@python.org> wrote:
>
>>
voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
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I just ran an analysis of static variable definitions in CPython code, using
clang, on Ubuntu and Windows. The results should be available here:
https://cpython.red-dove.com/
As I understand it, _Py_IDENTIFIER instances are supposed to hold constant
strings that are used in Python - e.g
rted internal APIs,
but then they're on their own, right?)
Regards,
Vinay Sajip
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> > Right, I'm pretty sure that right now Python doesn't have any way to
> share symbols between .c files without also exposing them in the C
> API.
On other C projects I've worked on, the public API is expressed in one set of
header files, and internal APIs tha
ple.
That's my motivation for looking at this area - I spent a bit of time working
with Eric at the recent core dev sprint, and wanted to explore the problems in
this area.
Regards,
Vinay
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To unsu
ted? If _Py_DecodeLocaleEx is not part of the public API
(and the leading underscore suggests so), should it be polluting the symbol
space?
The comment for PyAPI_FUNC is "Declares a public Python API function and return
type". Is this really the case, or has PyAPI_FUNC been coopted
s it's still
work in progress - which is why I'm asking these questions.
Regards,
Vinay Sajip
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ef. I will
check when I get a chance.
Regards,
Vinay Sajip
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Ah - I checked, and it's there OK ... (head scratch)
Regards,
Vinay Sajip
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OK - but that's just one I picked at random. There are others like it - what
would be the process for deciding which ones need to be made private and moved?
Should an issue be raised to track this?
Regards,
Vinay Sajip
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Fair enough. Pull request created:
https://github.com/python/cpython/pull/16347
Regards,
Vinay Sajip
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On 24/09/2019 04:21:45, Benjamin Peterson wrote:
On Fri, Sep 13, 2019, at 18:18, Sumana Harihareswara wrote:
Hi. I've joined python-dev to participate in this thread (I don't have
email delivery turned on; I'll be checking back via the web).
sorry :)
Benjamin, I am sorr
<mailto:ncogh...@gmail.com> a écrit :
> > > I don't quite understand the purpose of this change,
> > > as there's no
> > > stable ABI for applications embedding CPython.
> > > Well, I would like to prepare Python to provide a stable ABI for
>
rry for the bad timing. I dislike working under pressure. The
> discussion on python-dev, the bug tracker and pull requests was really
> interesting.
>
> The issue has been fixed: the whole idea of stable ABI for PyConfig
> has been abandoned. If you want to switch to a different vers
uot;thousandths of a second".
There is essentially the same thing in the Python 2 docs at
https://docs.python.org/2/library/profile.html
viz.
For example, if the timer returns times measured in _thousands_ of
seconds, the time unit would be |.001|.
Just trying for perfection!
Be
better than older compilers, but that requires some source changes
and testing to ensure that the build still works on older versions of macOS. At
this point in time nobody seems to have available time and need to work on
this, including myself.
Ronald
___
business days before (it's often the longest blocker for
> first-time contributions):
> https://devguide.python.org/pullrequest/#licensing
>
> Looking forward to your help!
>
> Brandt
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I think this probably belongs on python-list instead of python-dev because
python-dev is for development _of_ python, not _with_ python.
To answer your question though, there are a few tools that do this:
- https://github.com/vstinner/bytecode
- https://github.com/ll/codetransformer
I
Hi,
Few months ago, I submitted a PR [1] for the bpo [2] about locale.format
casting Decimal into float. Has someone some times to finish the review?
This change is blocking a bugfix on Tryton [3].
[1] https://github.com/python/cpython/pull/15275
[2] https://bugs.python.org/issue34311
[3] https
On 25.11.2019 1:10, Terry Reedy wrote:
Travis passed https://github.com/python/cpython/pull/17366
but a half hour later twice failed
https://github.com/python/cpython/pull/17370
This is build logic's fault, `python3.8` is not guaranteed to be present. I believe Configure is finding py
On 25.11.2019 9:50, Terry Reedy wrote:
On 11/24/2019 7:30 PM, Ivan Pozdeev via Python-Dev wrote:
On 25.11.2019 1:10, Terry Reedy wrote:
Travis passed https://github.com/python/cpython/pull/17366
but a half hour later twice failed
https://github.com/python/cpython/pull/17370
This is build
Hi Folks,
Python-dev seemed to be the most appropriate email alias for this,
though please do point me somewhere else if this is not appropriate.
We are using a custom arm64 based distro built using yocto and as such
we are currently using python 3.5.6. We are hitting a failure in a python3
d the hint).
This is fair - let me do this.
Peter.
On Thu, Nov 28, 2019 at 7:41 AM Peter Morrow via Python-Dev
mailto:python-dev@python.org>> wrote:
Hi Folks,
Python-dev seemed to be the most appropriate email alias for this,
though please do point me somewhere else if this is not appr
gt; million on various aspects of Python programs, such as the lines of code
> per module.
My main concern about this PEP is it doesn't specify the behavior when a given
limit is exceeded. Whether you choose 10 lines or 10 billion lines as the rule,
someone annoying (like me) is going t
I'm not sure if this is the right place to bring this up, python-ideas seemed
like language issues and python-dev seemed like CPython issues.
There are several unhashable builtin types present in CPython, as of today the
ones I've noticed are: lists, dicts, sets, and bytearrays.
Tw
it was an implementation issue, but as
you've
pointed out it's most certainly a language issue; and one that can be detected
statically.
Now I'd like to suggest that instead of relying on linters and static type
checkers to catch
these bad patterns. Python shouldn't have allowed
topher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R(206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
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chris.bar...@noaa.gov
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Nick Coghlan wrote:
> > A tool like
> > mypy will catch this for you.
> > Perhaps I should raise this as a mypy issue then?
> Aye, a typechecker failing to catch this situation would definitely be a
> reasonable issue to raise.
Roger that, I've raised this on mypy: h
this is bad user code, but I’m all for breaking bad user code in obvious
ways sooner rather than subtle ways later, especially in a language like Python.
[*]
https://arstechnica.com/information-technology/2019/10/chemists-discover-cross-platform-python-scripts-not-s
vate tab, it makes
> no difference.
>
> Anyone else having problems?
>
> Cheers,
> Mark.
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On 22.12.2019 18:21, Martin (gzlist) via Python-Dev wrote:
Logging in with openid using launchpad just worked for me, so
transient or related to google's openid support presumably.
I have been unable to log in with google for a long time; had to reset the
password to be able to l
On 08.01.2020 14:26, Musbur wrote:
Hello,
I'm experimenting with package development on different versions of Python in different virtualenvs. After running "make" I don't do "make
install", but rather I set up virtualenvs by running /path/to/source/python -m v
On Wed, Jan 08, 2020 at 12:26:39PM +0100, Musbur wrote:
> I'm experimenting with package development on different versions of Python
> in different virtualenvs. After running "make" I don't do "make install",
> but rather I set up virtualenvs by running /
wed it up after his requested changes were
> > apparently addressed, despite a couple of "pings".
> >
> > The experts index[1] lists Marc-Andre Lemburg as the expert for the locale
> > module, so perhaps he'd be interested in taking a look.
> >
> >
On 12.01.2020 19:20, mus...@posteo.org wrote:
Hi guys,
after I got the whole list into a lather about the merits of
the python-config program, let me rephrase the question:
Is there a "canonical" way of automatically finding the correct
include files and Python runtime library when
On 13.01.2020 16:21, Daniel Haude wrote:
Am 12.01.2020 23:39 schrieb Ivan Pozdeev via Python-Dev:
Virtualenv does create `python-config` shim in Linux.
Python3 doesn't. Definetely. Not on RHEL7 and Debian, that's where I tested it.
You are right, I've got it mixed up. Vir
I am really confused on writing python and what app I need to write it in any
tips or any ideas for apps??
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aws in my
reasoning.
If other people support this change I'd start the work of creating an
issue and PR to get this change implemented.
--
Michael Anckaert
+32 474 066 467
https://www.sinax.be
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, and, by proxy, this idea.
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iases to ABC classes
* Removed fractions.gcd() function (which is similar to math.gcd())
* Remove "U" mode of open(): having to use io.open() just for Python 2
makes the code uglier
* Removed old plistlib API: 2.7 doesn't have the new API
You had years to fix deprecation warnings in your co
calls PyObject_RichCompareBool()
under the covers, for an equality or inequality test, may or may not
invoke __eq__ or __ne__, depending on whether the comparands are the
same object. Also any context that inlines these special cases to
avoid the overhead of calling PyObject_RichComp
Who should I contact on subj? BPO UI doesn't have any contact information.
--
Regards,
Ivan
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here.)
The way to get the necessary information isn't fully documented, and neither is
the way to interpret it. And I don't think it _should_ be documented, because
it changes every so often, and for good reasons; we don't want anyone writing
third-party code that relies on thos
urn c
if issubclass(cls, type):
return _deepcopy_atomic
Also, all of the private functions that are stored in `_deepcopy_dispatch`
would rename their `deepcopy` parameter to `recurse`, and the two that don't
have such a parameter would add it.
[1]:
htt
onstruction call instead
of post-hooking it, the cost might be reduced enough to change that
calculation. But again, I'm not sure if there is such a way.)
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On 24.02.2020 7:07, Kyle Stanley wrote:
For a full list of merged PRs to CPython with a "CLA not signed" label, see the following:
https://github.com/python/cpython/pulls?utf8=%E2%9C%93&q=is%3Apr+state%3Amerged+label%3A%22CLA+not+signed%22
Note that if you open a PR, and _
was an incredibly minimal documentation enhancement:
https://github.com/python/cpython/pull/14069. It's not exactly a typo fix, but in retrospect, I'd consider it to be about equally
impactful. I can't speak for everyone, but my own motivation was to do something very mildly hel
Last time I checked, distutils didn't support compilation for anything but the
running Python instance, nor was it intended to. Should it?
If not, the efforts look misplaced, you should rather use a toolchain that
does...
On 19.03.2020 23:22, Steve Dower wrote:
So over on
On 20/03/2020 22:21, Victor Stinner wrote:
Motivating examples from the Python standard library
The examples below demonstrate how the proposed methods can make code
one or more of the following: (...)
IMO there are too many examples
rely on Cpython's behavior here, consciously or not.
Is there some python implementation that would have a problem with the
"is" test, if we were being this prescriptive? Honest question.
Of course this would open the question of what to do if the suffix is
the empty string. B
On 21/03/2020 20:16, Ned Batchelder wrote:
On 3/21/20 12:51 PM, Rob Cliffe via Python-Dev wrote:
On 21/03/2020 16:15, Eric V. Smith wrote:
On 3/21/2020 11:20 AM, Ned Batchelder wrote:
On 3/20/20 9:34 PM, Cameron Simpson wrote:
On 20Mar2020 13:57, Eric Fahlgren wrote:
On Fri, Mar 20
Python-Version: 3.9
Post-History: 30-Aug-2002
Abstract
This is a proposal to add two new methods, ``cutprefix`` and
``cutsuffix``, to the APIs of Python's various string objects. In
particular, the methods would be added to Unicode ``str`` objects,
binary ``bytes`` and ``byte
tartswith/endswith. If you were to talk about this kind of condition
using English instead of Python, you wouldn't say "if x has prefix y", you'd say "if x starts with y". (I doubt any programming language
uses hasPrefix or has_prefix for this, making it a strawman.)
*Bu
On 22.03.2020 7:46, Steven D'Aprano wrote:
On Sun, Mar 22, 2020 at 06:57:52AM +0300, Ivan Pozdeev via Python-Dev wrote:
Does it need to be separate methods?
Yes.
Overloading a single method to do two dissimilar things is poor design.
They are similar. We're removing stuff from
On 22/03/2020 22:25, Dennis Sweeney wrote:
Here's an updated version.
Online: https://www.python.org/dev/peps/pep-0616/
Source: https://raw.githubusercontent.com/python/peps/master/pep-0616.rst
Changes:
- More complete Python implementation to match what the type checking in
Sorry, another niggle re handling an empty affix: With your Python
implementation,
'aba'.cutprefix(('', 'a')) == 'aba'
'aba'.cutsuffix(('', 'a')) == 'ab'
This seems surprising.
Rob Gadfly Cliffe
On 22/03/2020
Matt Billenstein
m...@vazor.com
http://www.vazor.com/
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Thanks Ned - confirmed that works in 2.7.17 - maybe it was there in
2.7.16 and I just overlooked that messaging in the last step.
m
On Mon, Mar 23, 2020 at 09:11:09PM -0400, Ned Deily wrote:
> On Mar 23, 2020, at 20:30, Matt Billenstein via Python-Dev
> wrote:
> > Hi, installin
=>
--> print(socket.AF_UNIX)
AddressFamily.AF_UNIX ==> socket.AF_UNIX
Thoughts?
--
~Ethan~
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On 26.03.2020 2:41, Chris Angelico wrote:
On Thu, Mar 26, 2020 at 10:38 AM Ivan Pozdeev via Python-Dev
wrote:
I'm skeptical about anything that hides an object's "true nature": this is a
major landmine in diagnostics because it lies to you about what
you are looking at a
On 26.03.2020 4:10, Chris Angelico wrote:
On Thu, Mar 26, 2020 at 12:08 PM Ivan Pozdeev via Python-Dev
wrote:
On 26.03.2020 2:41, Chris Angelico wrote:
On Thu, Mar 26, 2020 at 10:38 AM Ivan Pozdeev via Python-Dev
wrote:
I'm skeptical about anything that hides an object's &q
On 26.03.2020 11:59, Serhiy Storchaka wrote:
26.03.20 01:35, Ivan Pozdeev via Python-Dev пише:
E. g. in this case, AF_UNIX is a member of some entity called "AddressFamily" -- so I would search the code for "AddressFamily" to see
what I'm looking at and what else I
On 26.03.2020 19:24, Ethan Furman wrote:
On 03/25/2020 06:53 PM, Ivan Pozdeev via Python-Dev wrote:
A diagnostic is always done by the same algorithm:
1) Identify the exact place in code where the problem manifests itself
2) Examine the state of the program at that moment to find out which if
d why they were
rejected, seems sufficient.
Rob Cliffe
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https://
t do you get? You presumably don’t even need to look that up or try
it out. It would be pretty confusing if it were different without the tuple.
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https:
e top N packages and run some script over the python files
contained therein, but I can't seem to find it atm.
m
--
Matt Billenstein
m...@vazor.com
http://www.vazor.com/
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ipt
> to download the top N packages and run some script over the python files
> contained therein, but I can't seem to find it atm.
>
>
> We got that. Check https://github.com/gvanrossum/pegen/tree/master/scripts --
> look at download_pypi_packages.py and test_pypi_pa
On 10.04.2020 20:20, Victor Stinner wrote:
Hi,
Here is a first draft a PEP which summarize the research work I'm
doing on CPython C API since 2017 and the changes that me and others
already made since Python 3.7 towards an "opaque" C API. The PEP is
also a collaboration with dev
runtimes share the same
> code base, features implemented in CPython will be available in both
> runtimes.
> * `Stable ABI`_: Only build a C extension once and use it on multiple
> Python runtimes and different versions of the same runtime.
> * Better advertise alternative Pyth
ssue40170#msg366474
Another issue with making structures opaque is that this makes it at best
harder to subclass builtin types in an extension while adding additional data
fields to the subclass. This is a similar issue as the fragile base class issue
that was fixed in Objective-C 2.0 by
First of all, be aware of the limitations of this approach (which will need to
be clearly documented if we go this way):
* It only allows valid Python identifiers -- while JSON accepts any sequence
of Unicode characters for keys
(http://www.ecma-international.org/publications/files/ECMA-ST
On 16.04.2020 0:34, Glenn Linderman wrote:
On 4/15/2020 12:47 PM, Ivan Pozdeev via Python-Dev wrote:
When writing a proof-of-concept implementation, however, I bumped into the need to distinguish which of the child objects are containers
(thus need to be wrapped as well) and which are the
use
>> the new API, which will take years and tons of work -- it's similar to
>> the Python 3 transition. Many libraries will never make the jump.
>
> Again, that is a grand statement that makes things sound much worse
> than they really are. I expect very very few exten
supporting sub-interpreters in PyObjC will likely be a lot of work,
>> mostly
>> due to being able to subclass Objective-C classes from Python. With sub-
>> interpreters a Python script in an interpreter could see an Objective-C
>> class in
>> a different sub-interpret
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