make elements of a list twice or more.

[liuerfire Wang]

Sorry for the title which didn't make clear.

Here is a list x = [b, a, c] (a, b, c are elements of x. Each of them are
different type).  Now I wanna generate a new list as [b, b, a, a, c, c].

I know we can do like that:

tmp = []
for i in x:
    tmp.append(i)
    tmp.append(i)

However, I wander is there a more beautiful way to do it, like [i for i in
x]?

Thanks.


-- 
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