list comprehension question

Boris Borcic bborcic at
Wed May 6 10:49:28 EDT 2009

Ross wrote:
> If I have a list of tuples a = [(1,2), (3,4), (5,6)], and I want to
> return a new list of each individual element in these tuples, I can do
> it with a nested for loop but when I try to do it using the list
> comprehension b = [j for j in i for i in a], my output is b =
> [5,5,5,6,6,6] instead of the correct b = [1,2,3,4,5,6]. What am I
> doing wrong?
> --

just fyi, in python 2.6


would do it

in python 2.5


would do it too, but I wouldn't try it with arbitrarily long a

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