On Jul 22, 8:25 am, Fredrik Lundh <[EMAIL PROTECTED]> wrote: > if there's only one level of recursion, and the lists aren't too long, > you can simply do: > > sum(list_of_lists, []) > > (this has quadratic performance, so don't use it for large structures)
For linear performance, you can use itertools:
list(itertools.chain(*list_of_lists))
Raymond
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