On Wed, Sep 9, 2020 at 8:52 AM Chris Angelico wrote:
[snip]
> And if you absolutely have to mutate in place:
>
> items[:] = [i for i in items if i not in "bcd"]
How does that work to mutate in place?
--
https://mail.python.org/mailman/listinfo/python-list
I was profiling a slow function in an application last week, and came
across something that I still can’t explain. Inside a loop that was being
called 4 times, inside a for loop that ran for a few dozen times there was
a list compression of the form:
[x.id for x in some_function()]
According to t
On Fri, 13 Jul 2018 at 10:31, Jim Oberholtzer
wrote:
> Nicholas:
>
> I am relatively new to Python, and my system of choice, IBM i on POWER,
> now supports Python directly. The open source movement is so strong that I
> think Python will be just fine. I've been a system programmer for 35
> yea
On Fri, 13 Jul 2018 at 10:04, Chris Angelico wrote:
> On Fri, Jul 13, 2018 at 11:54 PM, Nicholas Cole
> wrote:
> > Is it irrational to wonder whether projects should be looking to migrate
> to
> > new languages? This kind of announcement makes me worry for the futur
On Fri, 13 Jul 2018 at 08:51, Steven D'Aprano <
steve+comp.lang.pyt...@pearwood.info> wrote:
> On Fri, 13 Jul 2018 22:29:29 +1000, Chris Angelico wrote:
>
> > To be quite frank, the proposal would have quietly died on python-ideas
> > if it hadn't been for Guido's explicit support early on. (I kno
On Tue, Jan 30, 2018 at 7:26 PM, Terry Reedy wrote:
> On 1/30/2018 10:54 AM, Nicholas Cole wrote:
>
>> I have a strange problem on python 3.6.1
>
> [involving multiprocessing]
Interestingly it seems to have been a very subtle circular import
problem that was showing up only
On Tue, Jan 30, 2018 at 4:33 PM, Nicholas Cole wrote:
> On Tue, Jan 30, 2018 at 4:23 PM, Steven D'Aprano
> wrote:
>> On Tue, 30 Jan 2018 15:54:30 +0000, Nicholas Cole wrote:
>
>> I would say you're probably misinterpreting the nature of the problem.
>> I
On Tue, Jan 30, 2018 at 4:23 PM, Steven D'Aprano
wrote:
> On Tue, 30 Jan 2018 15:54:30 +, Nicholas Cole wrote:
> I would say you're probably misinterpreting the nature of the problem.
> Import * isn't a directive that can be ignored.
>
> Can you show us a
Dear List,
I have a strange problem on python 3.6.1
I am using the multiprocessing function to parallelize an expensive
operation, using the multiprocessing.Pool() and Pool.map() functions.
The function I am passing to map calls a function in another file
within the same model. And that file ha
On Tue, Nov 3, 2015 at 1:59 PM, Chris Angelico wrote:
> On Tue, Nov 3, 2015 at 9:32 PM, Nicholas Cole wrote:
>> Logging in as a different user and creating a venv works perfectly, so
>> it's clearly a config issue somewhere, but I've tried removing
>> ~/.bash
On Tue, Nov 3, 2015 at 12:27 PM, Wolfgang Maier
wrote:
> On 03.11.2015 11:32, Nicholas Cole wrote:
>>
>> I'm using python3.5 (installed from binaries) on the latest OS X.
>>
>> I have a curious issue with virtual environments on this machine (but
>> not on m
I'm using python3.5 (installed from binaries) on the latest OS X.
I have a curious issue with virtual environments on this machine (but
not on my other machine).
$ python3.5 -m venv testenv
$ source testenv/bin/activate
(testenv)$ python -m pip
/private/tmp/testenv/bin/python: No module named pi
On Sat, Jan 24, 2015 at 5:51 AM, Steven D'Aprano
wrote:
> and Ruby has an experimental one:
>
> http://blog.codeclimate.com/blog/2014/05/06/gradual-type-checking-for-ruby/
Interesting. Ruby has avoided the magic comment, and the typing is
done in annotations rather than in the function signatu
On Thursday, 22 January 2015, Chris Angelico > wrote:
> On Thu, Jan 22, 2015 at 7:10 PM, Mario Figueiredo
> wrote:
> > Possibly one common use case will be Unions. And that factory syntax is
> > really awful and long when you look at a function definition with as
> > little as 3 arguments. The on
On Thu, Jan 22, 2015 at 8:10 AM, Mario Figueiredo wrote:
> In article <54c0a571$0$13002$c3e8da3$54964...@news.astraweb.com>,
> steve+comp.lang.pyt...@pearwood.info says...
>>
>> The point isn't that there are no other alternative interpretations
>> possible, or that annotations are the only syntax
On Thu, Jan 22, 2015 at 5:56 AM, Chris Angelico wrote:
> On Thu, Jan 22, 2015 at 4:50 PM, Nicholas Cole
> wrote:
>> I would have preferred Python to mimic:
>>
>> Define function add taking price1, the price2, print_error equals true.
>> Price1 is a float. Price2 is
I don't think that Python is doomed. I *do* think that type-hinting is
useful, and Python has borrowed a syntax that is similar to that used in
other languages, so that it is a familiar one to many developers.
It is a stretch to call it intuitive though, either to write or to
read. Personally, I w
On Mon, Jan 19, 2015 at 11:52 PM, Devin Jeanpierre
wrote:
> On Mon, Jan 19, 2015 at 3:08 PM, Steven D'Aprano
> wrote:
>> Zachary Gilmartin wrote:
>>
>>> Why aren't there trees in the python standard library?
>>
>> Possibly because they aren't needed? Under what circumstances would you use
>> a tr
On Mon, Oct 27, 2014 at 7:28 AM, Stefan Behnel wrote:
> Hi,
>
> please keep this on-list.
Sorry about that. Wrong button!
[snip]
>> Yes - I want to store a series of XML diffs/patches and be able to
>> generate documents by applying them.
>
> Could you be a little more specific? There are lots
Hi All,
I'm looking for a python library that can parse XML Documents and
create xml-aware "diff" files, and then use those to patch documents.
In other words, I'd like something similar to the Google
diff-match-patch tools, but something which is XML aware.
I can see several projects on Pypi tha
On Fri, Aug 1, 2014 at 12:22 PM, Chris Angelico wrote:
> On Fri, Aug 1, 2014 at 9:10 PM, Wolfgang Keller wrote:
>> Thankfully, all actually user-friendly operating systems (MacOS,
>> TOS, RiscOS, probably AmigaOS, MacOS X) spare(d) their users the
>> bottomless cesspit of "package management" and
On Sun, Jun 22, 2014 at 3:51 AM, Nicholas Cannon
wrote:
> I have a simple program that is ran in the console with 2 modules and i was
> wondering how i could like export it so i could give it to someone to use as
> like a utlitie in the console?
I'm assuming that the 'someone' you want to give
Swift may yet be good for PyObjC (the python bridge to the various
Apple libraries); it is possible that there is some kind of
translation table that PyObjC can make use of to make its own method
names less ugly.
Of course, I wish they had picked Python rather than inventing their
own language. B
On Sun, Mar 2, 2014 at 2:38 PM, Roy Smith wrote:
> In article ,
> Stefan Behnel wrote:
>
>> Haven't seen any mention of it on this list yet, but since it's such an
>> obvious flaw in quite a number of programming languages, here's a good
>> article on the recent security bug in iOS, which was du
On Sunday, 9 February 2014, Asaf Las
>
wrote:
> On Sunday, February 9, 2014 11:05:58 PM UTC+2, Nicholas wrote:
> > Dear List,
> >
> >
> >
> > What is the latest "best-practice" for deploying a python wsgi
> > application into production?
> >
> > For development, I've been using CherryPyWSGIServer
Dear List,
What is the latest "best-practice" for deploying a python wsgi
application into production?
For development, I've been using CherryPyWSGIServer which has been
working very well (and the code is small enough to actually ship with
my application). But I would like some way of deploying
On Monday, 3 February 2014, Chris Angelico wrote:
> On Tue, Feb 4, 2014 at 12:50 AM, Nicholas Cole
> >
> wrote:
> >> There have been occasional times I've wanted an "explicit destruction"
> >> feature. Rather than the facetious exception I listed
On Mon, Feb 3, 2014 at 12:07 AM, Chris Angelico wrote:
> On Mon, Feb 3, 2014 at 10:40 AM, Roy Smith wrote:
>> I'm reasonably sure you posted this as humor, but there is some truth in
>> what you said. In the crypto/security domain, you often want to keep a
>> key or cleartext around only for the
On Wednesday, 22 January 2014, Asaf Las wrote:
> On Wednesday, January 22, 2014 5:08:25 AM UTC+2, Chris Angelico wrote:
> > I assume you're talking about pure Python code, running under CPython.
> > (If you're writing an extension module, say in C, there are completely
> > different ways to detec
On Tue, Jan 7, 2014 at 12:09 AM, Nicholas Cole wrote:
[SNIP]
> Even so, things like that are harder to create than they
> could be, or less prominently documented than one might have expected.
>
> Case in point: I have an application a friend/colleague of mine would like
> to lo
On Monday, 6 January 2014, Chris Angelico wrote:
> On Tue, Jan 7, 2014 at 10:39 AM, Nicholas Cole
> >
> wrote:
> > But what about the end-user? The end-user who just wants a blob (he
> doesn't
> > care about what language it is in - he just wants to solve the pro
This email is inspired by a YouTube video of a talk that Jessica McKellar
recently gave. I was struck by her analysis that it is hard to remain a
popular language (as Python currently is) and her call to action to address
friction points that make it hard for a non-Python audience to use Python
an
I hardly know which of the various threads on this topic to reply to!
No one is taking Python 2.7 away from anyone. It is going to be on the net
for years to come. Goodness! I expect if I wanted to go and download
Python 1.5 I could find it easily enough.
Like everyone else, when Python 3 came
Dear List,
What is the best way to distribute a private, pure python, Python 3
project that needs several modules (some available on pypi but some
private and used by several separate projects) in order to run?
I'd like to include everything that my project needs to run in a
single package. The
On Sun, Aug 11, 2013 at 12:50 PM, Skip Montanaro wrote:
> > See the Rationale of PEP 450 for more reasons why “install NumPy” is not
> > a feasible solution for many use cases, and why having ‘statistics’ as a
> > pure-Python, standard-library package is desirable.
>
> I read that before posting
On Thu, Aug 8, 2013 at 2:32 PM, Neatu Ovidiu wrote:
> On Thursday, August 8, 2013 4:08:13 PM UTC+3, Nicholas wrote:
> > On Thu, Aug 8, 2013 at 12:50 PM, Neatu Ovidiu wrote:
> >
> >
> >
> >
> > On Thursday, August 8, 2013 2:44:05 PM UTC+3, Neatu Ovidiu wrote:
> >
> > > On Thursday, August 8, 2013
On Thu, Aug 8, 2013 at 12:50 PM, Neatu Ovidiu wrote:
> On Thursday, August 8, 2013 2:44:05 PM UTC+3, Neatu Ovidiu wrote:
> > On Thursday, August 8, 2013 2:12:53 PM UTC+3, Nicholas wrote:
> >
> > > On Thu, Aug 8, 2013 at 11:38 AM, Neatu Ovidiu
> wrote:
> >
> > >
> >
> > >
> >
> > >
> >
> > >
> >
On Thu, Aug 8, 2013 at 11:38 AM, Neatu Ovidiu wrote:
>
>
> > But what's your use case?
> >
> > Does it occur often enough that you cannot afford a two-liner like
> I think uses cases are plenty.
>
>
The possible cases I can think of would be better served with list
comprehensions (what you seem t
On Friday, 2 August 2013, Chris “Kwpolska” Warrick wrote:
[snip]
>
> So, what are you feasting for? Nothing?
I have long since ceased to be amazed at the number of people who would
like their personal and arbitrary preferences, and the rationalisations
that go with them, to be validated and en
On Sun, Mar 10, 2013 at 8:42 PM, Mitya Sirenef wrote:
> On 03/10/2013 10:16 AM, Joseph L. Casale wrote:
>
>> I have a switch statement composed using a dict:
>>
> >
> >
> > switch = {
> > 'a': func_a,
> > 'b': func_b,
> > 'c': func_c
> > }
> > switch.get(var, default)()
> >
> >
> > As a result of
On Fri, Jan 11, 2013 at 6:01 AM, Rick Johnson
wrote:
>
> Python's module/package access uses dot notation.
>
> mod1.mod2.mod3.modN
>
> Like many warts of the language, this wart is not so apparent when first
> learning the language. The dot seems innocently sufficient, however, in
> truth it is
On Sun, Dec 30, 2012 at 8:07 PM, Albert Hopkins wrote:
>
>
> On Sun, Dec 30, 2012, at 01:57 PM, Nicholas Cole wrote:
>
> Dear List,
>
> I'm hoping to use the tarfile module in the standard library to move some
> files between computers.
>
> I can't see do
Dear List,
I'm hoping to use the tarfile module in the standard library to move some
files between computers.
I can't see documented anywhere what this library does with userids and
groupids. I can't guarantee that the computers involved will have the same
users and groups, and would like the ar
On Mon, Aug 27, 2012 at 10:05 AM, Ned Deily wrote:
> In article <503b3247$0$6877$e4fe5...@news2.news.xs4all.nl>,
> Hans Mulder wrote:
>> On 26/08/12 20:47:34, Nicholas Cole wrote:
>> It has been changed to
>>
>> ~/Library/Python/$py_version_short/lib/python/
On Mon, Aug 27, 2012 at 12:18 AM, Ned Deily wrote:
> In article
> ,
> Nicholas Cole wrote:
>> It certainly does exist. Distutils will happily put packages into it,
>> but import won't find them.
>
> That's odd! It works for me on 10.8 and it worked for
On Sun, Aug 26, 2012 at 10:23 PM, Ned Deily wrote:
> In article
> ,
> Nicholas Cole wrote:
>
>> On Sun, Aug 26, 2012 at 8:21 PM, Ned Deily wrote:
>> > In article
>> > ,
>> > Nicholas Cole wrote:
>> >> In all previous versions of pytho
On Sun, Aug 26, 2012 at 8:21 PM, Ned Deily wrote:
> In article
> ,
> Nicholas Cole wrote:
>> In all previous versions of python, I've been able to install packages
>> into the path:
>>
>> ~/Library/Python/$py_version_short/site-packages
>>
>> bu
Dear List,
In all previous versions of python, I've been able to install packages
into the path:
~/Library/Python/$py_version_short/site-packages
but in the rc builds of python 3.3 this is no longer part of sys.path.
Before I go hacking the install, is there a reason that this path was
removed?
On Wed, Jul 25, 2012 at 9:40 AM, Ulrich Eckhardt
wrote:
> What do you think?
>
I enjoyed the question, but actually I don't think this is a good idea.
1. If you really needed something like this, you could define it easily.
def do_nothing(*args, **keywords):
return None
2. If it were a bui
On Sat, Apr 7, 2012 at 12:10 AM, Ian Kelly wrote:
import codecs
codecs.getdecoder('unicode_escape')(s)[0]
> 'Hello: this is a test'
>
> Cheers,
> Ian
Thanks, Ian. I had assumed that if a unicode string didn't have a
.decode method, then I couldn't use a decoder on it, so it hadn't
occu
In Python 2 given the following raw string:
>>> s = r"Hello\x3a this is a test"
the escaping could be removed by use of the following:
>>> s.decode('string_escape')
In Python 3, however, the only way I can see to achieve the same
result is to convert into a byte stream and then back:
>>> bytes
On Sat, Aug 13, 2011 at 4:37 PM, Irmen de Jong wrote:
> On 13-8-2011 17:21, f...@slick.airforce-one.org wrote:
>> Hello.
>>
>> I've googled for hints but I didn't find anything, I hope it's not an
>> RTFM question :^)
>>
>> I want to have dialog boxes (a message with Yes/No/Cancel options,
>> poss
On Sun, Sep 5, 2010 at 8:57 PM, Ned Deily wrote:
> In article
> ,
> Nicholas Cole wrote:
>
>> On Sun, Sep 5, 2010 at 10:20 AM, Ned Deily wrote:
>> > I'm not sure why you think it is broken. The Apple 2.6 and the
>> > python.org 2.7 have differ
On Sun, Sep 5, 2010 at 10:20 AM, Ned Deily wrote:
> I'm not sure why you think it is broken. The Apple 2.6 and the
> python.org 2.7 have different site-package directories in different
> locations. That is to be expected. The Apple-supplied Python comes
> with some additional packages pre-insta
Dear List,
I have a horrible feeling that this is in some way related to the new
user installation directory in 2.7,or some problem with the framework
built, but I'm having great trouble with the module search path on
2.7.
I usually install modules to install_lib =
~/Library/Python/$py_version_sh
On Sat, Aug 21, 2010 at 3:31 PM, Mark Dickinson wrote:
[SNIP]
> So my guess is that the change was unintentional.
>
> It's probably worth a bug report. Even if the behaviour isn't going
> to change in either 2.x or 3.x (and it probably isn't), it might be
> possible to clarify the docs.
Dear M
Dear List,
I've searched for information on this without success. Has
weakref.proxy changed in Python 3? I couldn't see any note in the
documentation, but the following code behaves differently on Python
2.6.1 and Python 3:
import weakref
class Test(object): pass
realobject = Test()
pobject =
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