Re: repeat items in a list

From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: repeat items in a list
Date	2016-03-29 08:25 +1100
Message-ID	<mailman.115.1459200353.28225.python-list@python.org> (permalink)
References	<8935d5dc-5e62-4fa8-8e8f-bd5b1787ee9f@googlegroups.com> <mailman.65.1459034636.28225.python-list@python.org> <c4cf6ed9-cf6a-474b-b471-ce1066fd423d@googlegroups.com> <ndbpoc$o2$1@dont-email.me>

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On Tue, Mar 29, 2016 at 4:30 AM, Rob Gaddi
<rgaddi@highlandtechnology.invalid> wrote:
> beliavsky@aol.com wrote:
>
>> On Saturday, March 26, 2016 at 7:24:10 PM UTC-4, Erik wrote:
>>>
>>> Or, if you want to "import operator" first, you can use 'operator.add'
>>> instead of the lambda (but you _did_ ask for a one-liner ;)).
>>>
>>> Out of interest, why the fascination with one-liners?
>>
>> Thanks for your reply. Sometimes when I program in Python I think I am not using the full capabilities of the language, so I want to know if there are
>> more concise ways of doing things.
>
> Concise is only worth so much.  PEP20 tells us "Explicit is better than
> implicit", "Simple is better than complex" and "If the implementation is
> hard to explain, it's a bad idea".
>
> Python is a beautifully expressive language.  Your goal should not be to
> write the minimum number of lines of code to accomplish the task.
> Your goal should be to write the code such that your grandmother can
> understand it.  That way, when you screw it up, you'll be able to easily
> figure out where and how you did so.  Or failing that, you can get
> grangran to show you.

Just out of interest, did you (generic you) happen to notice Mark's
suggestion? It's a one-liner that nicely expresses the intention and
accomplishes the goal:

yy = [aa for aa in xx for _ in range(nrep)]

It quietly went through without fanfare, but I would say this is the
perfect solution to the original problem.

ChrisA

Thread

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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