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Re: Differences creating tuples and collections.namedtuples

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From Oscar Benjamin <oscar.j.benjamin@gmail.com>
Date Mon, 18 Feb 2013 12:05:11 +0000
Subject Re: Differences creating tuples and collections.namedtuples
To John Reid <johnbaronreid@gmail.com>
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On 18 February 2013 12:03, Oscar Benjamin <oscar.j.benjamin@gmail.com> wrote:
> On 18 February 2013 11:47, John Reid <johnbaronreid@gmail.com> wrote:
>> I'm seeing this problem because of the following code in IPython:
>>
>> def canSequence(obj):
>>     if isinstance(obj, (list, tuple)):
>>         t = type(obj)
>>         return t([can(i) for i in obj])
>>     else:
>>         return obj
>
> What is the point of the code above? If obj is a list or a tuple you
> create a new list or tuple with the same data and then return it
> otherwise you just return the object. What about:

Sorry, I didn't read this properly. I see that you want apply can() to
all the elements. What is the reason for wanting to preserve the type
of the sequence?


Oscar

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Differences creating tuples and collections.namedtuples John Reid <johnbaronreid@gmail.com> - 2013-02-18 03:47 -0800
  Re: Differences creating tuples and collections.namedtuples Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-18 12:03 +0000
  Re: Differences creating tuples and collections.namedtuples Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-18 12:05 +0000
  Re: Differences creating tuples and collections.namedtuples Dave Angel <davea@davea.name> - 2013-02-18 07:11 -0500
  Re: Differences creating tuples and collections.namedtuples John Reid <johnbaronreid@gmail.com> - 2013-02-18 13:49 +0000
  Re: Differences creating tuples and collections.namedtuples John Reid <johnbaronreid@gmail.com> - 2013-02-18 13:51 +0000
  Re: Differences creating tuples and collections.namedtuples John Reid <j.reid@mail.cryst.bbk.ac.uk> - 2013-02-18 14:09 +0000
    Re: Differences creating tuples and collections.namedtuples raymond.hettinger@gmail.com - 2013-02-18 23:48 -0800
      Re: Differences creating tuples and collections.namedtuples Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-19 08:06 +0000
      Re: Differences creating tuples and collections.namedtuples Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-19 08:57 +0000
      Re: Differences creating tuples and collections.namedtuples Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-19 08:06 +0000
      Re: Differences creating tuples and collections.namedtuples Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-19 08:05 +0000
    Re: Differences creating tuples and collections.namedtuples raymond.hettinger@gmail.com - 2013-02-18 23:48 -0800
  Re: Differences creating tuples and collections.namedtuples Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-18 14:15 +0000
  Re: Differences creating tuples and collections.namedtuples John Reid <johnbaronreid@gmail.com> - 2013-02-18 14:18 +0000
  Re: Differences creating tuples and collections.namedtuples Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-18 14:12 +0000
  Re: Differences creating tuples and collections.namedtuples John Reid <j.reid@mail.cryst.bbk.ac.uk> - 2013-02-18 14:23 +0000
  Re: Differences creating tuples and collections.namedtuples Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-18 14:53 +0000
  Re: Differences creating tuples and collections.namedtuples John Reid <j.reid@mail.cryst.bbk.ac.uk> - 2013-02-18 15:07 +0000
  Re: Differences creating tuples and collections.namedtuples Terry Reedy <tjreedy@udel.edu> - 2013-02-18 16:28 -0500
    Re: Differences creating tuples and collections.namedtuples Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-19 11:18 +1100
      Re: Differences creating tuples and collections.namedtuples Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-02-19 01:43 +0000
        Re: Differences creating tuples and collections.namedtuples Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-19 14:06 +1100
          Re: Differences creating tuples and collections.namedtuples Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-02-19 21:27 +1300
      Re: Differences creating tuples and collections.namedtuples Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-02-19 20:54 +1300
      Re: Differences creating tuples and collections.namedtuples John Reid <j.reid@mail.cryst.bbk.ac.uk> - 2013-02-19 09:30 +0000
      Re: Differences creating tuples and collections.namedtuples Terry Reedy <tjreedy@udel.edu> - 2013-02-19 22:38 -0500
        Re: Differences creating tuples and collections.namedtuples Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-22 10:38 +0000
      Re: Differences creating tuples and collections.namedtuples Chris Angelico <rosuav@gmail.com> - 2013-02-20 17:50 +1100
        Re: Differences creating tuples and collections.namedtuples Roy Smith <roy@panix.com> - 2013-02-20 09:09 -0500
    Re: Differences creating tuples and collections.namedtuples Roy Smith <roy@panix.com> - 2013-02-18 20:11 -0500
  Re: Differences creating tuples and collections.namedtuples alex23 <wuwei23@gmail.com> - 2013-02-18 17:47 -0800
    Re: Differences creating tuples and collections.namedtuples John Reid <j.reid@mail.cryst.bbk.ac.uk> - 2013-02-19 09:36 +0000

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