Concatenating a list of lists
Hans Nowak
wurmy at earthlink.net
Sat Aug 17 16:21:15 EDT 2002
Neophytos Michael wrote:
> A quick question for the python experts. I have a list of lists (only
> one level) that I want to turn into a flat list. What's the python
> way of achieving this? I came up with:
>
> def red_aux(l1, l2):
> l1.extend(l2);
> return l1;
>
> dest_list = reduce(red_aux, src_list, []);
You're using a functional approach, which works OK. Another approach would be,
looping over the list-with-sublists:
>>> x = [range(5), range(3), [6,7,8]]
>>> y = []
>>> for seq in x:
y.extend(seq)
>>> y
[0, 1, 2, 3, 4, 0, 1, 2, 6, 7, 8]
--
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