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Re: What's correct Python syntax?

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From Peter Otten <__peter__@web.de>
Subject Re: What's correct Python syntax?
Date Tue, 14 Jan 2014 12:33:26 +0100
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Igor Korot wrote:

> I am actually looking for a way to get a result from split which is
> sliced the way I want. Like in my example above.
> I mean I can probably make more variable by creating a tuple, but why?
> What is the purpose if I want only couple elements out of split.
> Doing it Perl way does not help:
> 
> C:\Documents and Settings\Igor.FORDANWORK\Desktop\winpdb>python
> Python 2.7.5 (default, May 15 2013, 22:43:36) [MSC v.1500 32 bit
> (Intel)] on win32
> Type "help", "copyright", "credits" or "license" for more information.
>>>> test = "I,like,my,chocolate"
>>>> print test.split(',')[2,3]
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> TypeError: list indices must be integers, not tuple
> 
> I can do it this way:
> 
>>>> testlist = test.split(',')
>>>> print testlist[2]
> my
> 
> but it will needlessly creates a list on which I will access by the index.
> 
> Why? All I need is couple of values out of n-dimensional list (array).

Python has no dedicated syntax for picking arbitrary items from a list 
If you are only concerned about printing use format():

>>> items = ["alpha", "beta", "gamma", "delta"]
>>> print "{1} {3} {0}".format(*items)
beta delta alpha

If you want to work with the values use operator.itemgetter():

>>> from operator import itemgetter
>>> itemgetter(1, 0, -1)(items)
('beta', 'alpha', 'delta')

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Thread

What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 00:46 -0800
  Re: What's correct Python syntax? Rustom Mody <rustompmody@gmail.com> - 2014-01-14 00:54 -0800
    Re: What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 01:25 -0800
      Re: What's correct Python syntax? Rustom Mody <rustompmody@gmail.com> - 2014-01-14 01:37 -0800
        Re: What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 02:02 -0800
          Re: What's correct Python syntax? Rustom Mody <rustompmody@gmail.com> - 2014-01-14 02:16 -0800
            Re: What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 02:35 -0800
              Re: What's correct Python syntax? Rustom Mody <rustompmody@gmail.com> - 2014-01-14 02:51 -0800
          Re: What's correct Python syntax? Roy Smith <roy@panix.com> - 2014-01-14 08:47 -0500
        Re: What's correct Python syntax? Peter Otten <__peter__@web.de> - 2014-01-14 12:33 +0100
        Re: What's correct Python syntax? Ned Batchelder <ned@nedbatchelder.com> - 2014-01-14 07:19 -0500
        Re: What's correct Python syntax? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-01-14 08:58 -0500
    Re: What's correct Python syntax? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-01-14 09:37 +0000
    Fwd: What's correct Python syntax? Igor Korot <ikorot01@gmail.com> - 2014-01-14 02:03 -0800
      Re: Fwd: What's correct Python syntax? Larry Hudson <orgnut@yahoo.com> - 2014-01-14 22:00 -0800
  Re: What's correct Python syntax? Alister <alister.ware@ntlworld.com> - 2014-01-14 10:59 +0000
  Re: What's correct Python syntax? Roy Smith <roy@panix.com> - 2014-01-14 08:34 -0500

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