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| References | (10 earlier) <51afec46$0$29966$c3e8da3$5496439d@news.astraweb.com> <mailman.2783.1370485793.3114.python-list@python.org> <51b0565d$0$11118$c3e8da3@news.astraweb.com> <CAPTjJmrFWPBNB5=A-Zn6L=_Bv1Fxd1qp-bTbqUEUFJRzY96CTw@mail.gmail.com> <koqa7g$vo9$1@ger.gmane.org> |
|---|---|
| Date | 2013-06-07 01:41 +1000 |
| Subject | Re: Bools and explicitness [was Re: PyWart: The problem with "print"] |
| From | Chris Angelico <rosuav@gmail.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.2810.1370533633.3114.python-list@python.org> (permalink) |
On Fri, Jun 7, 2013 at 1:35 AM, Robert Kern <robert.kern@gmail.com> wrote: > On 2013-06-06 10:45, Chris Angelico wrote: > >> For the "accept any object that has a next() method" sorts of rules, I >> don't know of any really viable system that does that usefully. The >> concept of implementing interfaces in Java comes close, but the class >> author has to declare that it's implementing some named interface. In >> theory there could be something that deduces the validity from the >> given structure, but I'm not aware of any language that does this. But >> it would let you do stuff like this (prototyped in Python): > > > As Serhiy notes, Go does this, almost exactly as you wrote it (modulo > syntax). > > http://golang.org/doc/effective_go.html#interfaces_and_types Thanks (and thanks for actually providing a link). Many years ago I came to the conclusion that anything I could conceive in language design has already been done somewhere :) Anyway, regardless of your language, there's always some criteria that can't be coded. Suppose the valid input for a function were "integers whose square roots are integers but whose cube roots are not". You won't easily get compile-time checking of that. ChrisA
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PyWart: The problem with "print" Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-02 10:04 -0700
Re: PyWart: The problem with "print" Chris Angelico <rosuav@gmail.com> - 2013-06-03 03:20 +1000
Re: PyWart: The problem with "print" Dan Sommers <dan@tombstonezero.net> - 2013-06-02 17:49 +0000
Re: PyWart: The problem with "print" Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-02 11:18 -0700
Re: PyWart: The problem with "print" Ned Batchelder <ned@nedbatchelder.com> - 2013-06-02 16:45 -0400
Re: PyWart: The problem with "print" Michael Torrie <torriem@gmail.com> - 2013-06-02 23:49 -0600
Re: PyWart: The problem with "print" Chris Angelico <rosuav@gmail.com> - 2013-06-03 17:17 +1000
Re: PyWart: The problem with "print" Alister <alister.ware@ntlworld.com> - 2013-06-03 08:01 +0000
Re: PyWart: The problem with "print" Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-02 11:09 -0700
Re: PyWart: The problem with "print" Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-02 19:03 +0000
Re: PyWart: The problem with "print" Chris Angelico <rosuav@gmail.com> - 2013-06-03 06:21 +1000
Re: PyWart: The problem with "print" jmfauth <wxjmfauth@gmail.com> - 2013-06-04 05:23 -0700
Re: PyWart: The problem with "print" rusi <rustompmody@gmail.com> - 2013-06-04 06:29 -0700
Re: PyWart: The problem with "print" Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-06-04 14:35 +0100
Re: PyWart: The problem with "print" Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-05 05:03 +0000
Re: PyWart: The problem with "print" Andrew Berg <robotsondrugs@gmail.com> - 2013-06-02 12:30 -0500
Re: PyWart: The problem with "print" Chris Angelico <rosuav@gmail.com> - 2013-06-03 03:34 +1000
Re: PyWart: The problem with "print" Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-02 18:58 +0000
Re: PyWart: The problem with "print" Chris Angelico <rosuav@gmail.com> - 2013-06-03 06:28 +1000
Re: PyWart: The problem with "print" Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-03 18:37 -0700
Re: PyWart: The problem with "print" Vito De Tullio <vito.detullio@gmail.com> - 2013-06-04 05:16 +0200
Re: PyWart: The problem with "print" Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-03 20:53 -0700
Re: PyWart: The problem with "print" Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-04 04:30 +0000
Bools and explicitness [was Re: PyWart: The problem with "print"] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-04 05:39 +0000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-04 08:44 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-05 02:00 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-04 09:19 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-05 02:27 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-05 05:28 +0000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] alex23 <wuwei23@gmail.com> - 2013-06-04 22:31 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Ned Batchelder <ned@nedbatchelder.com> - 2013-06-04 13:25 -0400
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-04 09:09 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] alex23 <wuwei23@gmail.com> - 2013-06-04 18:31 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Fábio Santos <fabiosantosart@gmail.com> - 2013-06-04 17:10 +0100
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Jason Swails <jason.swails@gmail.com> - 2013-06-04 13:32 -0400
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-04 11:42 -0600
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-04 16:21 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-06-05 00:37 +0100
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Michael Torrie <torriem@gmail.com> - 2013-06-04 23:28 -0600
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] "Russ P." <Russ.Paielli@gmail.com> - 2013-06-04 23:11 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-05 17:15 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] "Russ P." <Russ.Paielli@gmail.com> - 2013-06-05 00:47 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-06 09:49 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-07 02:59 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Dan Stromberg <drsalists@gmail.com> - 2013-06-06 18:26 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-06-05 09:59 +0100
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] "Russ P." <Russ.Paielli@gmail.com> - 2013-06-05 09:15 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-06 02:59 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] "Russ P." <Russ.Paielli@gmail.com> - 2013-06-05 14:59 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-06 01:56 +0000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-06 12:29 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] "Russ P." <Russ.Paielli@gmail.com> - 2013-06-05 21:25 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-06 00:06 -0600
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-06 09:29 +0000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-06 19:45 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Serhiy Storchaka <storchaka@gmail.com> - 2013-06-06 14:12 +0300
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Robert Kern <robert.kern@gmail.com> - 2013-06-06 16:35 +0100
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-07 01:41 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Robert Kern <robert.kern@gmail.com> - 2013-06-06 17:08 +0100
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] rusi <rustompmody@gmail.com> - 2013-06-06 10:27 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Devin Jeanpierre <jeanpierreda@gmail.com> - 2013-06-06 14:44 -0400
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Mark Janssen <dreamingforward@gmail.com> - 2013-06-06 10:59 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] alex23 <wuwei23@gmail.com> - 2013-06-06 17:53 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Mark Janssen <dreamingforward@gmail.com> - 2013-06-06 18:44 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] alex23 <wuwei23@gmail.com> - 2013-06-06 19:03 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Mark Janssen <dreamingforward@gmail.com> - 2013-06-06 22:01 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-07 02:29 +0000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Mark Janssen <dreamingforward@gmail.com> - 2013-06-06 20:14 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] rusi <rustompmody@gmail.com> - 2013-06-06 20:24 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Mark Janssen <dreamingforward@gmail.com> - 2013-06-06 20:30 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] rusi <rustompmody@gmail.com> - 2013-06-06 20:43 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] "Russ P." <Russ.Paielli@gmail.com> - 2013-06-06 11:08 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-06 08:49 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-07 02:00 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Grant Edwards <invalid@invalid.invalid> - 2013-06-06 17:32 +0000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-06 01:37 +0000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-06 11:45 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] rusi <rustompmody@gmail.com> - 2013-06-06 07:09 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-07 01:26 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] rusi <rustompmody@gmail.com> - 2013-06-06 08:36 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Chris Angelico <rosuav@gmail.com> - 2013-06-07 01:46 +1000
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-06 11:03 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-06 11:11 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Terry Jan Reedy <tjreedy@udel.edu> - 2013-06-05 12:10 -0400
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Michael Torrie <torriem@gmail.com> - 2013-06-05 17:18 -0600
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] "Russ P." <Russ.Paielli@gmail.com> - 2013-06-05 16:52 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Michael Torrie <torriem@gmail.com> - 2013-06-05 19:20 -0600
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Rick Johnson <rantingrickjohnson@gmail.com> - 2013-06-06 09:24 -0700
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] Devin Jeanpierre <jeanpierreda@gmail.com> - 2013-06-06 12:39 -0400
Re: Bools and explicitness [was Re: PyWart: The problem with "print"] alex23 <wuwei23@gmail.com> - 2013-06-06 17:55 -0700
Re: PyWart: The problem with "print" Chris Angelico <rosuav@gmail.com> - 2013-06-04 17:30 +1000
Re: PyWart: The problem with "print" Jason Swails <jason.swails@gmail.com> - 2013-06-02 20:16 -0400
Re: PyWart: The problem with "print" Dan Sommers <dan@tombstonezero.net> - 2013-06-03 03:10 +0000
Re: PyWart: The problem with "print" Jason Swails <jason.swails@gmail.com> - 2013-06-02 23:23 -0400
Re: PyWart: The problem with "print" Dan Sommers <dan@tombstonezero.net> - 2013-06-03 04:20 +0000
Re: PyWart: The problem with "print" Robert Kern <robert.kern@gmail.com> - 2013-06-03 11:52 +0100
Re: PyWart: The problem with "print" Tim Delaney <timothy.c.delaney@gmail.com> - 2013-06-03 13:37 +1000
Python Heisenbugs? (was: Re: PyWart: The problem with "print") Dan Sommers <dan@tombstonezero.net> - 2013-06-03 04:34 +0000
Re: Python Heisenbugs? (was: Re: PyWart: The problem with "print") Chris Angelico <rosuav@gmail.com> - 2013-06-03 15:05 +1000
Re: Python Heisenbugs? (was: Re: PyWart: The problem with "print") Devin Jeanpierre <jeanpierreda@gmail.com> - 2013-06-03 03:06 -0400
Re: PyWart: The problem with "print" Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-06-03 09:49 +0100
Re: PyWart: The problem with "print" Dave Angel <davea@davea.name> - 2013-06-03 08:56 -0400
Re: PyWart: The problem with "print" Chris Angelico <rosuav@gmail.com> - 2013-06-03 12:02 +1000
Re: PyWart: The problem with "print" Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-03 11:12 -0600
Re: PyWart: The problem with "print" Jason Swails <jason.swails@gmail.com> - 2013-06-03 15:09 -0400
Re: PyWart: The problem with "print" Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-03 20:31 +0000
Re: PyWart: The problem with "print" Chris Angelico <rosuav@gmail.com> - 2013-06-04 06:44 +1000
Re: PyWart: The problem with "print" Jason Swails <jason.swails@gmail.com> - 2013-06-03 15:10 -0400
Re: PyWart: The problem with "print" Jason Swails <jason.swails@gmail.com> - 2013-06-03 15:11 -0400
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