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Re: repeat items in a list

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From larudwer <larudwer@freenet.de>
Newsgroups comp.lang.python
Subject Re: repeat items in a list
Date Mon, 28 Mar 2016 13:36:56 +0200
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Am 27.03.2016 um 13:13 schrieb Antonio Caminero Garcia:
> On Sunday, March 27, 2016 at 11:52:22 AM UTC+2, larudwer wrote:
>> how about
>>
>>   >>>> sorted(["a", "b"]*3)
>> ['a', 'a', 'a', 'b', 'b', 'b']
>
> that's cooler, less efficient though and do not maintain the original order.
> In case such order was important, you should proceed as follows:
>
> If the elements are unique, this would work:
>
> sorted(sequence*nrep, key=sequence.index)
>
> Otherwise you'd need a more complex key function (maybe a method of a class with
 > a static variable that tracks the number of times that such method is 
called and
 > with a "dynamic index functionality" that acts accordingly (i-th 
nrep-group of value v))
 > and imo it does not worth it.
>


in case you want to mainain order:

 >>>> ["a","b"]*3
['a', 'b', 'a', 'b', 'a', 'b']

is completely suffincient.

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repeat items in a list beliavsky@aol.com - 2016-03-26 15:12 -0700
  Re: repeat items in a list Cameron Simpson <cs@zip.com.au> - 2016-03-27 10:05 +1100
  Re: repeat items in a list Erik <python@lucidity.plus.com> - 2016-03-26 23:23 +0000
    Re: repeat items in a list beliavsky@aol.com - 2016-03-26 16:36 -0700
      Re: repeat items in a list Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2016-03-28 17:30 +0000
        Re: repeat items in a list Chris Angelico <rosuav@gmail.com> - 2016-03-29 08:25 +1100
          Re: repeat items in a list Antonio Caminero Garcia <tonycamgar@gmail.com> - 2016-03-29 01:43 -0700
        Re: repeat items in a list Erik <python@lucidity.plus.com> - 2016-03-28 23:14 +0100
  Re: repeat items in a list Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-26 23:28 +0000
    Re: repeat items in a list beliavsky@aol.com - 2016-03-26 16:54 -0700
      Re: repeat items in a list Paul Rubin <no.email@nospam.invalid> - 2016-03-26 22:35 -0700
  Re: repeat items in a list Antonio Caminero Garcia <tonycamgar@gmail.com> - 2016-03-27 01:02 -0700
    Re: repeat items in a list Antonio Caminero Garcia <tonycamgar@gmail.com> - 2016-03-27 01:30 -0700
    Re: repeat items in a list Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-03-27 14:09 +0300
  Re: repeat items in a list larudwer <larudwer@freenet.de> - 2016-03-27 11:52 +0200
    Re: repeat items in a list Antonio Caminero Garcia <tonycamgar@gmail.com> - 2016-03-27 04:13 -0700
      Re: repeat items in a list larudwer <larudwer@freenet.de> - 2016-03-28 13:36 +0200
        Re: repeat items in a list Random832 <random832@fastmail.com> - 2016-03-28 10:04 -0400
        Re: repeat items in a list Vito De Tullio <vito.detullio@gmail.com> - 2016-03-29 23:25 +0200
        Re: repeat items in a list Michael Selik <michael.selik@gmail.com> - 2016-03-29 22:05 +0000
        Re: repeat items in a list Peter Otten <__peter__@web.de> - 2016-03-30 17:52 +0200

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