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Re: Closures in leu of pointers?

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Date Sat, 29 Jun 2013 14:42:58 -0500
From Tim Chase <tim@thechases.com>
To python-list@python.org
Subject Re: Closures in leu of pointers?
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On 2013-06-29 19:19, Steven D'Aprano wrote:
> Nobody ever asks why Python doesn't let you sort an int, or take
> the square of a list...

just to be ornery, you can sort an int:

>>> i = 314159265
>>> ''.join(sorted(str(i)))
'112345569'

And I suppose, depending on how you define it, you can square a list:

>>> lst = list('abcd')
>>> import itertools
>>> list(itertools.product(lst, lst))
[('a', 'a'), ('a', 'b'), ('a', 'c'), ('a', 'd'), ('b', 'a'), ('b',
'b'), ('b', 'c'), ('b', 'd'), ('c', 'a'), ('c', 'b'), ('c', 'c'),
('c', 'd'), ('d', 'a'), ('d', 'b'), ('d', 'c'), ('d', 'd')]

Or, if you want to do it frequently, Python graciously even allows
you to do things like

>>> class MultiList(list):
...     def __pow__(self, power):
...             return list(itertools.product(*([self] * power)))
... 
>>> lst = MultiList("abcd")
>>> lst ** 2
[('a', 'a'), ('a', 'b'), ('a', 'c'), ('a', 'd'), ('b', 'a'), ('b',
'b'), ('b', 'c'), ('b', 'd'), ('c', 'a'), ('c', 'b'), ('c', 'c'),
('c', 'd'), ('d', 'a'), ('d', 'b'), ('d', 'c'), ('d', 'd')]


:-)

-tkc

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Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 02:34 -0700
  Re: Closures in leu of pointers? Fábio Santos <fabiosantosart@gmail.com> - 2013-06-29 10:42 +0100
  Re: Closures in leu of pointers? Peter Otten <__peter__@web.de> - 2013-06-29 12:01 +0200
    Re: Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 04:21 -0700
      Re: Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 04:44 -0700
        Re: Closures in leu of pointers? Peter Otten <__peter__@web.de> - 2013-06-29 14:12 +0200
          Re: Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 05:26 -0700
            Re: Closures in leu of pointers? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-06-29 15:37 +0100
              Re: Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 07:48 -0700
        Re: Closures in leu of pointers? Michael Torrie <torriem@gmail.com> - 2013-06-29 07:56 -0600
        Re: Closures in leu of pointers? Michael Torrie <torriem@gmail.com> - 2013-06-29 12:36 -0600
      Re: Closures in leu of pointers? Michael Torrie <torriem@gmail.com> - 2013-06-29 08:02 -0600
      Re: Closures in leu of pointers? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-06-29 19:02 +0200
        Re: Closures in leu of pointers? rusi <rustompmody@gmail.com> - 2013-06-29 10:33 -0700
          Re: Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 11:37 -0700
            Re: Closures in leu of pointers? Michael Torrie <torriem@gmail.com> - 2013-06-29 12:58 -0600
            Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-29 18:59 +0000
        Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-29 18:51 +0000
          Re: Closures in leu of pointers? Michael Torrie <torriem@gmail.com> - 2013-06-29 13:04 -0600
          Re: Closures in leu of pointers? rusi <rustompmody@gmail.com> - 2013-06-29 12:11 -0700
      Re: Closures in leu of pointers? Michael Torrie <torriem@gmail.com> - 2013-06-29 12:35 -0600
        Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-29 19:19 +0000
          Re: Closures in leu of pointers? Tim Chase <tim@thechases.com> - 2013-06-29 14:42 -0500
            Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-30 01:41 +0000
          Re: Closures in leu of pointers? Joshua Landau <joshua.landau.ws@gmail.com> - 2013-06-29 21:02 +0100
          Re: Closures in leu of pointers? Michael Torrie <torriem@gmail.com> - 2013-06-29 16:02 -0600
      Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-29 18:45 +0000
        Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-29 19:00 +0000
        Re: Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 12:20 -0700
          Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-29 19:33 +0000
            Re: Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 12:34 -0700
            Re: Closures in leu of pointers? Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-29 13:47 -0600
            Re: Closures in leu of pointers? Terry Reedy <tjreedy@udel.edu> - 2013-06-29 16:53 -0400
              Re: Closures in leu of pointers? rusi <rustompmody@gmail.com> - 2013-06-30 01:56 -0700
                Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-06-30 11:22 +0000
                Re: Closures in leu of pointers? rusi <rustompmody@gmail.com> - 2013-06-30 04:42 -0700
            Re: Closures in leu of pointers? Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-29 15:21 -0600
              Re: Closures in leu of pointers? cts.private.yahoo@gmail.com - 2013-06-29 14:30 -0700
            Re: Closures in leu of pointers? Terry Reedy <tjreedy@udel.edu> - 2013-06-30 00:32 -0400
            Re: Closures in leu of pointers? Chris Angelico <rosuav@gmail.com> - 2013-06-30 15:08 +1000
              Re: Closures in leu of pointers? rusi <rustompmody@gmail.com> - 2013-06-30 00:36 -0700
            Re: Closures in leu of pointers? Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-29 23:46 -0600
              Re: Closures in leu of pointers? alex23 <wuwei23@gmail.com> - 2013-07-01 14:57 +1000
              Re: Closures in leu of pointers? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-01 07:36 +0000
            Re: Closures in leu of pointers? Chris Angelico <rosuav@gmail.com> - 2013-06-30 15:59 +1000
            Re: Closures in leu of pointers? Terry Reedy <tjreedy@udel.edu> - 2013-06-30 02:11 -0400
            Re: Closures in leu of pointers? Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-30 00:24 -0600
          Re: Closures in leu of pointers? Michael Torrie <torriem@gmail.com> - 2013-06-29 16:03 -0600
      Re: Closures in leu of pointers? Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-29 13:23 -0600
      Re: Closures in leu of pointers? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-06-30 12:07 +0200
      Re: Closures in leu of pointers? Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-30 11:13 -0600
      Re: Closures in leu of pointers? Ian Kelly <ian.g.kelly@gmail.com> - 2013-06-30 11:18 -0600

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