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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