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Groups > comp.lang.python > #109672
| From | Antoon Pardon <antoon.pardon@rece.vub.ac.be> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: I'm wrong or Will we fix the ducks limp? |
| Date | 2016-06-08 13:01 +0200 |
| Message-ID | <mailman.75.1465383739.2306.python-list@python.org> (permalink) |
| References | (15 earlier) <5757dbaf$0$1615$c3e8da3$5496439d@news.astraweb.com> <5757E840.80805@rece.vub.ac.be> <mailman.72.1465378914.2306.python-list@python.org> <nj8s9k$p3$1@dont-email.me> <5757FB1B.5000502@rece.vub.ac.be> |
Op 08-06-16 om 12:33 schreef BartC:
> On 08/06/2016 10:41, Antoon Pardon wrote:
>> Op 08-06-16 om 10:47 schreef Steven D'Aprano:
>>> On Wednesday 08 June 2016 17:53, Antoon Pardon wrote:
>>>
>>>> Python could go the simula route, which has two kinds of
>>>> assignment. One with the python semantics and one with C
>>>> semantics.
>>>>
>>>> Let as use := for the C sematics assignment and <- for the
>>>> python sematics assignment. We could then do something like
>>>> the following.
>>>>
>>>> ls := [5, 8, 13, 21]
>>>> a <- ls[2]
>>>> a := 34
>>>> print ls # [5, 8, 34, 21]
>>> What you seem to be describing is similar to reference parameter
>>> semantics from
>>> Pascal. Assignment doesn't work that way in C, or Python.
>>
>> I disagree. In python the assignment does work similar to the
>> reference parameter
>> semantics in pascal. See the following
>>
>> A = range[4]
>> B = A
>> B[2] = 5
>> print A # [0, 1, 5, 2]
>
> (Did you mean range(4) and [0, 1, 5, 3]?)
Yes, sorry about that.
>
> But a 'proper' reference allows a complete replacement of what it
> refers to. That would mean being able to do:
>
> B = "Cat"
> print A # "Cat"
>
> No tricks involving in-place updates such as assigning to list
> elements are needed.
No it doesn't mean that. It means that if you mutate the object through one variable,
you can see the result of that mutation through the other variable. But if the
assignment doesn't mutate, you can't have such effect through assignment.
In python, you can sometimes simulate a mutating assignment and then we get this.
>>> A = [8, 5, 3, 2]
>>> B = A
>>> B[:] = [3, 5, 8, 13]
>>> A
[3, 5, 8, 13]
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I'm wrong or Will we fix the ducks limp? Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-03 07:20 -0700
Re: I'm wrong or Will we fix the ducks limp? Paul Rudin <paul.nospam@rudin.co.uk> - 2016-06-03 15:34 +0100
Re: I'm wrong or Will we fix the ducks limp? Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-03 08:04 -0700
Re: I'm wrong or Will we fix the ducks limp? Ian Kelly <ian.g.kelly@gmail.com> - 2016-06-03 09:35 -0600
Re: I'm wrong or Will we fix the ducks limp? Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-03 08:50 -0700
Re: I'm wrong or Will we fix the ducks limp? Michael Selik <michael.selik@gmail.com> - 2016-06-03 16:04 +0000
Re: I'm wrong or Will we fix the ducks limp? Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-03 16:06 -0700
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve@pearwood.info> - 2016-06-04 12:31 +1000
Re: I'm wrong or Will we fix the ducks limp? Christopher Reimer <christopher_reimer@icloud.com> - 2016-06-03 19:50 -0700
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve@pearwood.info> - 2016-06-04 19:12 +1000
Re: I'm wrong or Will we fix the ducks limp? Matt Wheeler <m@funkyhat.org> - 2016-06-03 15:54 +0000
Re: I'm wrong or Will we fix the ducks limp? Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-04 20:17 -0700
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve@pearwood.info> - 2016-06-05 16:37 +1000
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-05 11:01 +0300
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-05 13:53 -0400
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-05 22:20 +0300
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-05 17:16 -0400
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-06 11:13 +0300
Re: I'm wrong or Will we fix the ducks limp? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-06 13:08 +1200
Re: I'm wrong or Will we fix the ducks limp? Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-05 18:28 -0700
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-05 13:42 -0400
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-05 22:38 +0300
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve@pearwood.info> - 2016-06-06 13:52 +1000
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-06 00:08 -0400
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve@pearwood.info> - 2016-06-07 01:42 +1000
Re: I'm wrong or Will we fix the ducks limp? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-07 17:42 +1200
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-07 20:18 +1000
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-07 14:32 +0200
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve@pearwood.info> - 2016-06-08 02:03 +1000
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-08 10:08 +0200
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-07 11:33 -0400
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-08 09:53 +0200
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-08 18:47 +1000
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-08 11:41 +0200
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-08 11:33 +0100
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-08 13:01 +0200
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-08 13:34 +0100
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-08 16:18 +0200
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-08 19:37 +0300
Re: I'm wrong or Will we fix the ducks limp? Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-08 19:49 -0700
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 09:30 +0200
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-09 12:19 +0300
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 12:19 +0200
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-09 16:13 +0300
Re: I'm wrong or Will we fix the ducks limp? lists@juliensalort.org (Julien Salort) - 2016-06-09 13:46 +0200
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 14:35 +0200
Re: I'm wrong or Will we fix the ducks limp? Paul Rudin <paul.nospam@rudin.co.uk> - 2016-06-09 11:00 +0100
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-09 15:56 +0300
Re: I'm wrong or Will we fix the ducks limp? Paul Rudin <paul.nospam@rudin.co.uk> - 2016-06-09 15:09 +0100
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-09 18:14 +0300
Re: I'm wrong or Will we fix the ducks limp? Paul Rudin <paul.nospam@rudin.co.uk> - 2016-06-09 17:22 +0100
Re: I'm wrong or Will we fix the ducks limp? Paul Rudin <paul.nospam@rudin.co.uk> - 2016-06-09 17:48 +0100
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-09 22:35 +0300
Re: I'm wrong or Will we fix the ducks limp? Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-06-10 08:31 +0300
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-09 14:36 -0400
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-08 18:29 +0100
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 09:50 +0200
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-09 10:10 +0100
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 11:55 +0200
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-09 11:48 +0100
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 13:08 +0200
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-09 13:25 +0100
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 14:48 +0200
Re: I'm wrong or Will we fix the ducks limp? Rustom Mody <rustompmody@gmail.com> - 2016-06-08 05:36 -0700
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-06-09 17:36 +1000
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 11:46 +0200
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-09 13:03 +0300
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-09 11:42 +0100
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-09 11:53 +0100
Re: I'm wrong or Will we fix the ducks limp? Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-06-09 13:56 +0300
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 13:19 +0200
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-09 13:17 +0100
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-09 14:59 +0200
Re: I'm wrong or Will we fix the ducks limp? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-06 18:37 +1200
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve@pearwood.info> - 2016-06-07 02:19 +1000
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-06 12:57 -0400
Re: I'm wrong or Will we fix the ducks limp? Steven D'Aprano <steve@pearwood.info> - 2016-06-07 04:59 +1000
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-06 17:13 -0400
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-07 00:47 +0300
Re: I'm wrong or Will we fix the ducks limp? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-07 19:03 +1200
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-07 10:56 +0300
Re: I'm wrong or Will we fix the ducks limp? Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-06-07 11:41 +0300
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-07 11:49 +0100
Re: I'm wrong or Will we fix the ducks limp? Random832 <random832@fastmail.com> - 2016-06-07 11:14 -0400
Re: I'm wrong or Will we fix the ducks limp? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-08 17:59 +1200
Re: I'm wrong or Will we fix the ducks limp? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-07 18:33 +1200
Re: I'm wrong or Will we fix the ducks limp? Chris Angelico <rosuav@gmail.com> - 2016-06-07 16:55 +1000
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-06 22:55 +0100
Re: I'm wrong or Will we fix the ducks limp? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-06-07 18:20 +1200
Re: I'm wrong or Will we fix the ducks limp? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2016-06-06 11:23 +0200
Re: I'm wrong or Will we fix the ducks limp? Marko Rauhamaa <marko@pacujo.net> - 2016-06-06 13:10 +0300
Re: I'm wrong or Will we fix the ducks limp? Chris Angelico <rosuav@gmail.com> - 2016-06-06 21:57 +1000
Re: I'm wrong or Will we fix the ducks limp? BartC <bc@freeuk.com> - 2016-06-06 13:35 +0100
Re: I'm wrong or Will we fix the ducks limp? Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-05 18:25 -0700
Re: I'm wrong or Will we fix the ducks limp? Peter Pearson <pkpearson@nowhere.invalid> - 2016-06-03 16:05 +0000
Re: I'm wrong or Will we fix the ducks limp? Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-03 16:09 -0700
Re: I'm wrong or Will we fix the ducks limp? cs@zip.com.au - 2016-06-06 08:41 +1000
Re: I'm wrong or Will we fix the ducks limp? Nagy László Zsolt <gandalf@shopzeus.com> - 2016-06-03 18:11 +0200
Re: I'm wrong or Will we fix the ducks limp? Sayth Renshaw <flebber.crue@gmail.com> - 2016-06-03 16:11 -0700
Re: I'm wrong or Will we fix the ducks limp? Terry Reedy <tjreedy@udel.edu> - 2016-06-03 22:12 -0400
Re: I'm wrong or Will we fix the ducks limp? jfine2358@gmail.com - 2016-06-06 07:32 -0700
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