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Re: Wrapping around a list in Python.

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From Dave Angel <davea@davea.name>
Subject Re: Wrapping around a list in Python.
Date Mon, 16 Dec 2013 07:51:49 -0500
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On Sun, 15 Dec 2013 21:26:49 -0800 (PST), shengjie.shengjie@live.com 
wrote:
> The idea is to grab the last 4 elements of the array. However i 
have an array that contains a few hundred elements in it. And the 
values continues to .append over time. How would i be able to display 
the last 4 elements of the array under such a condition?

Your earlier example showed [5, 4, 1, 2] as one of the results, which 
is not "the last four". But assuming your goal has now changed and 
you really have an array (or list) of a few hundred elements,  then 
you can just use data [-4:] to get them. 

But if you're being imprecise and these values are not really in an 
array, then follow Peter ' advice and use a deque. Or fake it with a 
list,  appending to the end and popping from the beginning.

-- 
DaveA

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Thread

Wrapping around a list in Python. shengjie.shengjie@live.com - 2013-12-15 20:38 -0800
  Re: Wrapping around a list in Python. Ben Finney <ben+python@benfinney.id.au> - 2013-12-16 15:59 +1100
    Re: Wrapping around a list in Python. shengjie.shengjie@live.com - 2013-12-15 21:07 -0800
      Re: Wrapping around a list in Python. shengjie.shengjie@live.com - 2013-12-15 21:10 -0800
        Re: Wrapping around a list in Python. Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-12-16 09:33 +0000
    Re: Wrapping around a list in Python. Denis McMahon <denismfmcmahon@gmail.com> - 2013-12-16 10:12 +0000
  Re: Wrapping around a list in Python. Gary Herron <gary.herron@islandtraining.com> - 2013-12-15 21:10 -0800
    Re: Wrapping around a list in Python. shengjie.shengjie@live.com - 2013-12-15 21:26 -0800
      Re: Wrapping around a list in Python. Peter Otten <__peter__@web.de> - 2013-12-16 10:15 +0100
      Re: Wrapping around a list in Python. David Robinow <drobinow@gmail.com> - 2013-12-16 07:41 -0500
      Re: Wrapping around a list in Python. Dave Angel <davea@davea.name> - 2013-12-16 07:51 -0500
  Re: Wrapping around a list in Python. shengjie.shengjie@live.com - 2013-12-15 21:26 -0800

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