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From: Peter Otten <__peter__@web.de>
Subject: Re: how to iterate all sub-element in a list
Date: Fri, 31 Jan 2014 11:48:13 +0100
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seaspeak@gmail.com wrote:

> a list like L = [[1, 2], [3, 4, 5], [6]], which has
> random numbers of list, which has random numbers.
> 
> How do I get another list m = [1, 2, 3, 4, 5, 6] in a succinct way? ( or
> iterate them) I should provide my own solution, but I really can't come
> out with one.

sum(L, [])
list(itertools.chain.from_iterable(L))

but as a learning experience you should do this at least once with two 
nested for loops, then again with a single for loop and list.extend().