repeat items in a list

[Chris Angelico]

On Tue, Mar 29, 2016 at 4:30 AM, Rob Gaddi
<rgaddi at highlandtechnology.invalid> wrote:
> beliavsky at 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