On 7/08/2013 6:50 PM, liuerfire Wang wrote: > 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]. from itertools import chain new_list = list(chain.from_iterable(zip(x,x)))