how to append to a list twice?

[Gerard Flanagan]

John Salerno wrote:
> If I want to create a list of the form [100, 99, 99, 98, 98, 97, 97...]
> (where each item is repeated twice after the first one), how might I do
> that most efficiently?
>
> Right now I have this:
>
> series = [100]
> for x in range(10):   # just for testing
>      series.append(series[-1] - 1)
>
> But of course that only does it once, and I don't want to have to copy
> and paste the append line. Perhaps there's a better way than this.
>
> Thanks.


series = [100] + [ t for t in range(99,90,-1) for _ in [0,1] ]

(what's wrong with two appends again...?)