Re: Python Questions - July 25, 2015

From	Rob Gaddi <rgaddi@technologyhighland.invalid>
Newsgroups	comp.lang.python
Subject	Re: Python Questions - July 25, 2015
Date	2015-07-28 18:46 +0000
Organization	A noiseless patient Spider
Message-ID	<mp8im6$knj$3@dont-email.me> (permalink)
References	(3 earlier) <mp6e1a$knj$1@dont-email.me> <mailman.1044.1438073468.3674.python-list@python.org> <ybItx.48040$vg2.2941@fx34.am4> <55b7a9f5$0$1668$c3e8da3$5496439d@news.astraweb.com> <jkOtx.42040$Ec3.13257@fx24.am4>

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On Tue, 28 Jul 2015 17:45:00 +0100, BartC wrote:

> On 28/07/2015 17:12, Steven D'Aprano wrote:
>> On Tue, 28 Jul 2015 07:46 pm, BartC wrote:
>>
>>> (I'm still reeling from the size of that Anaconda download. Apparently
>>> it contains a whole bunch of stuff, nothing to do with numpy, that I
>>> don't need. But one of the listed packages was 'libffi', which is
>>> puzzling. This library lets a C-like language call functions with
>>> runtime-determined argument types. How would that be used in Python?)
>>
>> https://en.wikipedia.org/wiki/Libffi
> 
> Yes, I know (I was looking at it myself a few days ago for another
> project). But while it might be used for implementing some of Python's
> internals, I was wondering what it was doing in a user-level set of
> libraries, given that it's mostly a bunch of C code.
> 
> Perhaps they were just padding the list to make it look more impressive.

It underpins the ctypes implementation, which is neither here nor there.

If I remember right, numpy does dynamic loading of one of a couple 
different (FORTRAN?) algebra libraries depending on which ones it can 
find installed.  That would be a pretty clear use case for libffi.

-- 
Rob Gaddi, Highland Technology -- www.highlandtechnology.com
Email address domain is currently out of order.  See above to fix.

Thread

Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-25 04:39 -0500
  Python Questions - July 25, 2015 tandrewjohnson@outlook.com - 2015-07-25 04:36 -0700
    Python Questions - July 25, 2015 tandrewjohnson@outlook.com - 2015-07-25 04:39 -0700
    Re: Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-25 08:16 -0500
      Re: Python Questions - July 25, 2015 Laura Creighton <lac@openend.se> - 2015-07-25 15:59 +0200
        Re: Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-26 12:49 -0500
          Re: Python Questions - July 25, 2015 Laura Creighton <lac@openend.se> - 2015-07-26 20:38 +0200
            Re: Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-26 13:48 -0500
    Re: Python Questions - July 25, 2015 BartC <bc@freeuk.com> - 2015-07-26 13:49 +0100
      Re: Python Questions - July 25, 2015 Chris Angelico <rosuav@gmail.com> - 2015-07-26 23:07 +1000
        Re: Python Questions - July 25, 2015 BartC <bc@freeuk.com> - 2015-07-26 15:30 +0100
      Re: Python Questions - July 25, 2015 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-26 14:19 +0100
      Re: Python Questions - July 25, 2015 Steven D'Aprano <steve@pearwood.info> - 2015-07-27 00:22 +1000
        Re: Python Questions - July 25, 2015 BartC <bc@freeuk.com> - 2015-07-26 15:58 +0100
      Re: Python Questions - July 25, 2015 Rob Gaddi <rgaddi@technologyhighland.invalid> - 2015-07-27 23:14 +0000
        Re: Python Questions - July 25, 2015 Terry Reedy <tjreedy@udel.edu> - 2015-07-28 04:50 -0400
          Re: Python Questions - July 25, 2015 BartC <bc@freeuk.com> - 2015-07-28 10:46 +0100
            Re: Python Questions - July 25, 2015 Chris Angelico <rosuav@gmail.com> - 2015-07-28 20:17 +1000
              Re: Python Questions - July 25, 2015 BartC <bc@freeuk.com> - 2015-07-28 11:44 +0100
                Re: Python Questions - July 25, 2015 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-28 13:47 +0100
                Re: Python Questions - July 25, 2015 Steven D'Aprano <steve@pearwood.info> - 2015-07-29 02:02 +1000
            Re: Python Questions - July 25, 2015 Steven D'Aprano <steve@pearwood.info> - 2015-07-29 02:12 +1000
              Re: Python Questions - July 25, 2015 BartC <bc@freeuk.com> - 2015-07-28 17:45 +0100
                Re: Python Questions - July 25, 2015 Rob Gaddi <rgaddi@technologyhighland.invalid> - 2015-07-28 18:46 +0000
                Re: Python Questions - July 25, 2015 Laura Creighton <lac@openend.se> - 2015-07-29 18:13 +0200
                Re: Python Questions - July 25, 2015 BartC <bc@freeuk.com> - 2015-07-29 17:50 +0100
          Re: Python Questions - July 25, 2015 wxjmfauth@gmail.com - 2015-07-28 07:09 -0700
        Re: Python Questions - July 25, 2015 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-28 13:58 +0100
  Re: Python Questions - July 25, 2015 Laura Creighton <lac@openend.se> - 2015-07-25 15:30 +0200
    Re: Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-25 08:45 -0500
  Re: Python Questions - July 25, 2015 tjohnson <tandrewjohnson@outlook.com> - 2015-07-25 15:16 -0700
  Re: Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-26 14:17 -0500
    Re: Python Questions - July 25, 2015 mm0fmf <none@mailinator.com> - 2015-07-26 22:15 +0100
      Re: Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-26 17:08 -0500
        Re: Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-26 17:32 -0500
      Re: Python Questions - July 25, 2015 Ned Batchelder <ned@nedbatchelder.com> - 2015-07-26 16:12 -0700
        Re: Python Questions - July 25, 2015 "E.D.G." <edgrsprj@ix.netcom.com> - 2015-07-26 18:58 -0500
          Re: Python Questions - July 25, 2015 Laura Creighton <lac@openend.se> - 2015-07-27 11:15 +0200
        Re: Python Questions - July 25, 2015 Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-07-27 01:18 +0100
          Re: Python Questions - July 25, 2015 mm0fmf <none@mailinator.com> - 2015-07-27 17:46 +0100
    Re: Python Questions - July 25, 2015 tjohnson <tandrewjohnson@outlook.com> - 2015-07-27 03:24 -0700
      Re: Python Questions - July 25, 2015 wxjmfauth@gmail.com - 2015-07-29 00:43 -0700

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