repeat items in a list

[beliavsky at aol.com]

On Saturday, March 26, 2016 at 7:24:10 PM UTC-4, Erik wrote:
> Hi,
> 
> On 26/03/16 22:12, beliavsky--- via Python-list wrote:
> > I can create a list that has repeated elements of another list as follows:
> >
> > xx = ["a","b"]
> > nrep = 3
> > print xx
> > yy = []
> > for aa in xx:
> >      for i in range(nrep):
> >          yy.append(aa)
> > print yy
> >
> > output:
> > ['a', 'b']
> > ['a', 'a', 'a', 'b', 'b', 'b']
> >
> > Is there a one-liner to create a list with repeated elements?
> 
> yy = reduce(lambda a, b: a + b, ([i] * nrep for i in xx), [])
> 
> 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.