Groups > comp.lang.python > #92001

Re: How to access the low digits of a list

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From	Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject	Re: How to access the low digits of a list
Date	Wed, 03 Jun 2015 22:41:33 +0100
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On 03/06/2015 22:08, Rustom Mody wrote:
> On Tuesday, June 2, 2015 at 7:50:58 PM UTC+5:30, Ian wrote:
>> On Tue, Jun 2, 2015 at 6:35 AM, Rustom Mody  wrote:
>>> For that matter even this works
>>> But I am not sure whats happening or that I like it
>>>
>>>>>> [x[-2:]  for x in lines]
>>> ['12', '42', '49', '56', '25', '36', '49', '64', '81', '00']
>>
>> x[-2:] selects all items in the sequence with index i such that len(x)
>> - 2 <= i < len(x). For a sequence of length 2 or less, that's the
>> entire sequence.
>
> Thanks -- learn something
> So it means that indices can give indexerror; slices cannot?
> Seems fair enough put that way, but is visually counterintuitive
>

Are you seriously trying to say that you teach Python but don't 
understand a basic that is here 
https://docs.python.org/3/tutorial/introduction.html, "Slice indices 
have useful defaults; an omitted first index defaults to zero, an 
omitted second index defaults to the size of the string being sliced."?

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence

Thread

How to access the low digits of a list fl <rxjwg98@gmail.com> - 2015-06-02 05:23 -0700
  Re: How to access the low digits of a list Joel Goldstick <joel.goldstick@gmail.com> - 2015-06-02 08:32 -0400
  Re: How to access the low digits of a list Frank Stutzman <stutzman@cat2.kjsl.com> - 2015-06-02 12:34 +0000
  Re: How to access the low digits of a list Rustom Mody <rustompmody@gmail.com> - 2015-06-02 05:35 -0700
    Re: How to access the low digits of a list Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-02 08:19 -0600
      Re: How to access the low digits of a list Rustom Mody <rustompmody@gmail.com> - 2015-06-03 14:08 -0700
        Re: How to access the low digits of a list Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-06-03 22:41 +0100
        Re: How to access the low digits of a list Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-03 16:36 -0600
        Re: How to access the low digits of a list Steven D'Aprano <steve@pearwood.info> - 2015-06-04 23:27 +1000
  Re: How to access the low digits of a list Steven D'Aprano <steve@pearwood.info> - 2015-06-03 01:11 +1000

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