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Re: What other languages use the same data model as Python?

References	(5 earlier) <4dc1ca92$0$10552$742ec2ed@news.sonic.net> <5smwp.309$BG2.230@newsfe08.iad> <4dc22882$0$10557$742ec2ed@news.sonic.net> <92fb5jFa2lU1@mid.individual.net> <4dc2c52e$0$10567$742ec2ed@news.sonic.net>
From	Ian Kelly <ian.g.kelly@gmail.com>
Date	2011-05-05 10:44 -0600
Subject	Re: What other languages use the same data model as Python?
Newsgroups	comp.lang.python
Message-ID	<mailman.1196.1304613911.9059.python-list@python.org> (permalink)

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On Thu, May 5, 2011 at 9:41 AM, John Nagle <nagle@animats.com> wrote:
> On 5/5/2011 3:06 AM, Gregory Ewing wrote:
>>
>> John Nagle wrote:
>>
>>> A reasonable compromise would be that "is" is treated as "==" on
>>> immutable objects.
>>
>> That wouldn't work for tuples, which can contain references
>> to other objects that are not immutable.
>
>    Such tuples are still identical, even if they
> contain identical references to immutable objects.

>>> a = (1, 2, [3, 4, 5])
>>> b = (1, 2, [3, 4, 5])
>>> a == b
True
>>> a is b  # Using the proposed definition
True
>>> a[0] is b[0]
True
>>> a[1] is b[1]
True
>>> a[2] is b[2]
False
>>> a[2].append(6)
>>> a
(1, 2, [3, 4, 5, 6])
>>> b
(1, 2, [3, 4, 5])
>>> a == b
False
>>> a is b
False

Thus a and b cannot be used interchangeably even though "a is b"
originally returned True.

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What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-01 08:45 +0000
Re: What other languages use the same data model as Python? Alec Taylor <alec.taylor6@gmail.com> - 2011-05-01 19:00 +1000
Re: What other languages use the same data model as Python? Chris Rebert <clp2@rebertia.com> - 2011-05-01 02:04 -0700
Re: What other languages use the same data model as Python? Terry Reedy <tjreedy@udel.edu> - 2011-05-01 15:10 -0400
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-02 10:37 +1200
Re: What other languages use the same data model as Python? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-05-02 07:45 +0000
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-02 13:12 +0000
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-02 10:33 +1200
Re: What other languages use the same data model as Python? Terry Reedy <tjreedy@udel.edu> - 2011-05-01 21:42 -0400
Re: What other languages use the same data model as Python? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-05-02 00:28 -0700
Re: What other languages use the same data model as Python? Duncan Booth <duncan.booth@invalid.invalid> - 2011-05-02 08:43 +0000
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-03 13:39 +0100
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-03 14:49 +0000
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-03 15:20 +0000
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-03 22:10 +0100
Re: What other languages use the same data model as Python? Mel <mwilson@the-wire.com> - 2011-05-03 12:33 -0400
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Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-03 21:47 +0100
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-04 08:00 +1000
Re: What other languages use the same data model as Python? Devin Jeanpierre <jeanpierreda@gmail.com> - 2011-05-04 02:56 -0700
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-04 10:51 +0000
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Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-05 00:20 +1000
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Re: What other languages use the same data model as Python? Devin Jeanpierre <jeanpierreda@gmail.com> - 2011-05-04 09:18 -0700
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-04 18:03 +0100
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-05 20:55 +1200
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-05 11:31 +0100
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-07 21:21 +1200
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-07 19:28 +1000
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-08 10:39 +1200
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-08 02:17 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-07 23:10 -0500
Re: What other languages use the same data model as Python? rusi <rustompmody@gmail.com> - 2011-05-07 22:48 -0700
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-09 12:52 +1200
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-09 11:38 +0100
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-09 21:18 +1000
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-09 21:53 +0100
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-09 14:29 +0000
Re: What other languages use the same data model as Python? Tim Golden <mail@timgolden.me.uk> - 2011-05-09 15:41 +0100
Re: What other languages use the same data model as Python? Ethan Furman <ethan@stoneleaf.us> - 2011-05-09 10:15 -0700
Re: What other languages use the same data model as Python? Mel <mwilson@the-wire.com> - 2011-05-09 13:38 -0400
Re: What other languages use the same data model as Python? Terry Reedy <tjreedy@udel.edu> - 2011-05-09 16:23 -0400
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-10 19:41 +1200
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-10 19:35 +1000
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Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-09 16:28 -0500
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-09 07:23 +0100
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 15:14 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 14:22 -0500
Re: What other languages use the same data model as Python? Benjamin Kaplan <benjamin.kaplan@case.edu> - 2011-05-04 15:46 -0400
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 14:58 -0500
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-04 21:40 +0100
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-05 21:31 +1200
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 14:50 +0000
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 12:14 +0000
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-05 22:37 +1000
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Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 16:49 -0500
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-05 07:12 +0100
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-05 21:08 +1200
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-05 19:12 +1000
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 14:30 +0000
Re: What other languages use the same data model as Python? TheSaint <nobody@nowhere.net.no> - 2011-05-07 20:18 +0800
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 12:49 +0000
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 14:31 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 09:40 -0500
Re: What other languages use the same data model as Python? Roy Smith <roy@panix.com> - 2011-05-05 10:49 -0400
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 14:47 -0500
Re: What other languages use the same data model as Python? Ben Finney <ben+python@benfinney.id.au> - 2011-05-05 07:43 +1000
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-05 12:43 +1000
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 15:42 +0000
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-07 22:04 +1200
Re: What other languages use the same data model as Python? Ben Finney <ben+python@benfinney.id.au> - 2011-05-08 06:09 +1000
Re: What other languages use the same data model as Python? Roy Smith <roy@panix.com> - 2011-05-07 16:24 -0400
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-08 10:54 +1200
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-08 09:43 +1000
Re: What other languages use the same data model as Python? Ben Finney <ben+python@benfinney.id.au> - 2011-05-08 11:16 +1000
Re: What other languages use the same data model as Python? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-05-07 23:16 -0700
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-08 16:32 +1000
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-10 13:49 +1200
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-10 03:13 +0000
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-10 14:05 +0000
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-10 16:09 +0100
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-10 15:16 +0000
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-11 01:27 +1000
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-10 16:40 +0100
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-11 01:44 +1000
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-10 13:51 +1200
Re: What other languages use the same data model as Python? MRAB <python@mrabarnett.plus.com> - 2011-05-10 03:47 +0100
Re: What other languages use the same data model as Python? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-05-09 23:15 -0700
Re: What other languages use the same data model as Python? John Nagle <nagle@animats.com> - 2011-05-04 14:52 -0700
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 19:46 -0500
Re: What other languages use the same data model as Python? John Nagle <nagle@animats.com> - 2011-05-04 21:32 -0700
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-05 22:06 +1200
Re: What other languages use the same data model as Python? John Nagle <nagle@animats.com> - 2011-05-05 08:41 -0700
Re: What other languages use the same data model as Python? Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-05 10:44 -0600
Re: What other languages use the same data model as Python? Chris Torek <nospam@torek.net> - 2011-05-06 17:57 +0000
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-07 21:39 +1200
Re: What other languages use the same data model as Python? Mel <mwilson@the-wire.com> - 2011-05-05 07:44 -0400
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-05 21:48 +1000
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 13:59 +0000
Re: What other languages use the same data model as Python? John Nagle <nagle@animats.com> - 2011-05-05 08:58 -0700
Re: What other languages use the same data model as Python? Neil Cerutti <neilc@norwich.edu> - 2011-05-05 13:19 +0000
Re: What other languages use the same data model as Python? Terry Reedy <tjreedy@udel.edu> - 2011-05-05 14:39 -0400
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-04 11:56 +0100
Re: What other languages use the same data model as Python? Devin Jeanpierre <jeanpierreda@gmail.com> - 2011-05-04 06:13 -0700
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 14:33 -0500
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-04 20:19 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 16:35 -0500
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-04 21:57 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 20:11 -0500
Re: What other languages use the same data model as Python? Mark Hammond <mhammond@skippinet.com.au> - 2011-05-05 12:09 +1000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 23:01 -0500
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-05 22:19 +1200
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 14:17 +0000
Re: What other languages use the same data model as Python? Roy Smith <roy@panix.com> - 2011-05-05 10:31 -0400
Re: What other languages use the same data model as Python? Neil Cerutti <neilc@norwich.edu> - 2011-05-05 15:10 +0000
Re: What other languages use the same data model as Python? Roy Smith <roy@panix.com> - 2011-05-05 11:29 -0400
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-06 08:01 +1000
Re: What other languages use the same data model as Python? Neil Cerutti <neilc@norwich.edu> - 2011-05-06 13:10 +0000
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 16:57 +0000
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 16:56 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 11:58 -0500
Re: What other languages use the same data model as Python? Neil Cerutti <neilc@norwich.edu> - 2011-05-05 17:39 +0000
Re: What other languages use the same data model as Python? Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-05 13:13 -0600
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 15:12 -0500
Re: What other languages use the same data model as Python? Tim Roberts <timr@probo.com> - 2011-05-04 20:23 -0700
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 23:55 -0500
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 14:21 +0000
Re: What other languages use the same data model as Python? Mel <mwilson@the-wire.com> - 2011-05-05 08:09 -0400
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-05 07:34 +0100
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 14:10 +0000
Re: What other languages use the same data model as Python? Mel <mwilson@the-wire.com> - 2011-05-05 11:30 -0400
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 10:56 -0500
RE: What other languages use the same data model as Python? Andreas Tawn <andreas.tawn@ubisoft.com> - 2011-05-05 18:27 +0200
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-07 22:09 +1200
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-06 07:56 +1000
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 14:14 +0000
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 15:11 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 11:00 -0500
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 16:52 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 12:03 -0500
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-07 22:12 +1200
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-07 12:03 +0000
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 16:48 +0000
Re: What other languages use the same data model as Python? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-05-05 22:24 -0700
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 11:18 -0500
Re: What other languages use the same data model as Python? Ethan Furman <ethan@stoneleaf.us> - 2011-05-05 10:28 -0700
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 12:19 -0500
Re: What other languages use the same data model as Python? Chris Torek <nospam@torek.net> - 2011-05-06 18:17 +0000
Re: What other languages use the same data model as Python? Chris Torek <nospam@torek.net> - 2011-05-06 19:06 +0000
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-06 14:25 -0500
Re: What other languages use the same data model as Python? Chris Angelico <rosuav@gmail.com> - 2011-05-07 09:43 +1000
Re: What other languages use the same data model as Python? Ian Kelly <ian.g.kelly@gmail.com> - 2011-05-04 16:22 -0600
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-04 19:51 -0500
Re: What other languages use the same data model as Python? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-05-05 14:51 +0000
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-04 21:20 +0100
Re: What other languages use the same data model as Python? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-05-04 22:10 -0700
Re: What other languages use the same data model as Python? harrismh777 <harrismh777@charter.net> - 2011-05-05 00:19 -0500
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 14:25 +0000
Re: What other languages use the same data model as Python? sturlamolden <sturla@molden.no> - 2011-05-04 07:44 -0700
Re: What other languages use the same data model as Python? Michael Torrie <torriem@gmail.com> - 2011-05-04 09:40 -0600
Re: What other languages use the same data model as Python? sturlamolden <sturla@molden.no> - 2011-05-04 09:40 -0700
Re: What other languages use the same data model as Python? Benjamin Kaplan <benjamin.kaplan@case.edu> - 2011-05-04 13:15 -0400
Re: What other languages use the same data model as Python? sturlamolden <sturla@molden.no> - 2011-05-04 10:19 -0700
Re: What other languages use the same data model as Python? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2011-05-05 15:48 +1200
Re: What other languages use the same data model as Python? Hans Georg Schaathun <hg@schaathun.net> - 2011-05-05 05:58 +0100
Re: What other languages use the same data model as Python? Grant Edwards <invalid@invalid.invalid> - 2011-05-05 14:24 +0000
Re: What other languages use the same data model as Python? Hrvoje Niksic <hniksic@xemacs.org> - 2011-05-03 15:50 +0200
Re: What other languages use the same data model as Python? sturlamolden <sturla@molden.no> - 2011-05-04 07:28 -0700

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