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| From | Ben Finney <ben+python@benfinney.id.au> |
| Subject | Re: Reference |
| Date | Thu, 06 Mar 2014 08:07:25 +1100 |
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Show key headers only | View raw
Marko Rauhamaa <marko@pacujo.net> writes:
> Say I implement Python. Say I returned a random number for id(), how
> would that violate the language spec?
You could do that, certainly. So long as that randomly-chosen integer
was always the same for every object, and never the same for any other
concurrently-existing object, it can just as well be assigned randomly.
If you're saying that your implementation of ‘id(foo)’ would return a
*different* integer when called at different times for the same object,
then yes, that violates the specification for that function.
> It would violate the spec. But there would have to be a paragraph in
> the specification that was violated or a reference test case that
> failed.
Yes. It would violate this paragraph:
Every object has an identity, a type and a value. An object’s
identity never changes once it has been created […] the id()
function returns an integer representing its identity.
<URL:http://docs.python.org/3/reference/datamodel.html>
Again, I ask you to read these documents for comprehension.
> For example, this test would demonstrate obviously invalid behavior:
>
> >>> print(id(x))
> 129
> >>> print(id(x))
> 201
Yes. That violates the paragraph above, and so that implementation is
not compliant with the Python language reference.
--
\ “I watched the Indy 500, and I was thinking that if they left |
`\ earlier they wouldn't have to go so fast.” —Steven Wright |
_o__) |
Ben Finney
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Reference "ast" <nomail@invalid.com> - 2014-03-03 10:42 +0100
Object identity (was: Reference) Ben Finney <ben+python@benfinney.id.au> - 2014-03-03 21:00 +1100
Re: Object identity (was: Reference) "ast" <nomail@invalid.com> - 2014-03-03 11:21 +0100
Re: Reference "Mark H. Harris" <harrismh777@gmail.com> - 2014-03-03 05:09 -0800
Re: Reference Grant Edwards <invalid@invalid.invalid> - 2014-03-03 14:29 +0000
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-03 07:52 -0800
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-04 08:10 +1100
Re: Reference Tim Chase <python.list@tim.thechases.com> - 2014-03-03 15:24 -0600
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-04 08:31 +1100
Re: Reference Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-03 21:35 +0000
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-04 00:07 +0200
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-04 09:18 +1100
Re: Reference Alister <alister.ware@ntlworld.com> - 2014-03-04 11:10 +0000
Re: Reference Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-04 11:48 +0000
Re: Reference "Rhodri James" <rhodri@wildebst.org.uk> - 2014-03-05 00:25 +0000
Re: Reference Tim Chase <python.list@tim.thechases.com> - 2014-03-03 15:51 -0600
Re: Reference Jerry Hill <malaclypse2@gmail.com> - 2014-03-03 17:02 -0500
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-04 00:22 +0200
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-04 09:27 +1100
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-04 09:33 +1100
Re: Reference Steven D'Aprano <steve@pearwood.info> - 2014-03-04 04:52 +0000
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-04 16:24 +1100
Re: Reference "Rhodri James" <rhodri@wildebst.org.uk> - 2014-03-05 01:08 +0000
Re: Reference Roy Smith <roy@panix.com> - 2014-03-04 21:09 -0500
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-04 19:36 -0800
Re: Reference Ian Kelly <ian.g.kelly@gmail.com> - 2014-03-04 21:08 -0700
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-04 20:31 -0800
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-05 15:32 +1100
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-04 20:47 -0800
Re: Reference Steven D'Aprano <steve@pearwood.info> - 2014-03-05 05:06 +0000
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-04 21:47 -0800
Re: Reference alex23 <wuwei23@gmail.com> - 2014-03-05 16:01 +1000
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-04 22:10 -0800
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-05 17:22 +1100
Re: Reference alex23 <wuwei23@gmail.com> - 2014-03-05 16:28 +1000
Re: Reference Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-05 12:24 +0000
Re: Reference Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-05 12:21 +0000
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-05 17:20 +1100
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-05 09:40 -0800
Re: Reference Tim Chase <python.list@tim.thechases.com> - 2014-03-05 12:12 -0600
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-06 05:33 +1100
Re: Reference Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-05 18:19 +0000
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-05 22:23 +0200
Re: Reference Grant Edwards <invalid@invalid.invalid> - 2014-03-05 20:31 +0000
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-05 22:46 +0200
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-06 08:07 +1100
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-06 08:10 +1100
Re: Reference Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-05 21:34 +0000
Re: Reference Terry Reedy <tjreedy@udel.edu> - 2014-03-05 18:00 -0500
Re: Reference Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-06 03:01 +0000
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-04 22:03 -0800
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-05 17:26 +1100
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-05 17:32 +1100
Re: Reference Tim Chase <python.list@tim.thechases.com> - 2014-03-05 08:24 -0600
Re: Reference Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-05 18:29 +0000
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-05 22:34 +0200
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-06 08:01 +1100
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-05 23:14 +0200
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-06 08:26 +1100
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-05 23:50 +0200
Re: Reference Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-06 00:35 +0000
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-06 11:50 +1100
Re: Reference Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-06 17:46 +0000
Re: Reference Tim Chase <python.list@tim.thechases.com> - 2014-03-05 15:33 -0600
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-06 08:37 +1100
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-06 02:52 +0200
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-06 12:05 +1100
Re: Reference alex23 <wuwei23@gmail.com> - 2014-03-06 12:12 +1000
Re: Reference Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-05 21:46 +0000
Re: Reference Marko Rauhamaa <marko@pacujo.net> - 2014-03-05 08:23 +0200
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-04 22:33 -0800
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-05 17:40 +1100
Re: Reference Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-05 12:35 +0000
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-05 23:45 +1100
Re: Reference Jerry Hill <malaclypse2@gmail.com> - 2014-03-04 10:19 -0500
Re: Reference Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-04 15:42 +0000
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-05 03:02 +1100
Re: Reference Roy Smith <roy@panix.com> - 2014-03-04 11:14 -0500
Re: Reference MRAB <python@mrabarnett.plus.com> - 2014-03-04 17:12 +0000
Re: Reference Rustom Mody <rustompmody@gmail.com> - 2014-03-04 08:24 -0800
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-05 02:25 +1100
Re: Reference Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2014-03-05 14:37 +0100
Re: Reference Steven D'Aprano <steve@pearwood.info> - 2014-03-04 03:59 +0000
Re: Reference Ben Finney <ben+python@benfinney.id.au> - 2014-03-04 09:17 +1100
Re: Reference Roy Smith <roy@panix.com> - 2014-03-03 18:02 -0500
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-04 10:09 +1100
Re: Reference Steven D'Aprano <steve@pearwood.info> - 2014-03-04 04:38 +0000
Re: Reference Terry Reedy <tjreedy@udel.edu> - 2014-03-03 13:48 -0500
Re: Reference Steven D'Aprano <steve@pearwood.info> - 2014-03-04 03:45 +0000
Re: Reference Alexander Blinne <news@blinne.net> - 2014-03-04 13:55 +0100
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-05 01:06 +1100
Re: Reference Alexander Blinne <news@blinne.net> - 2014-03-04 22:53 +0100
Re: Reference Chris Angelico <rosuav@gmail.com> - 2014-03-05 09:01 +1100
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