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?
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just fyi, in python 2.6

list(itertools.chain.from_iterable(a))

would do it

in python 2.5

list(itertools.chain(*a))

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





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