Concatenating a list of lists

[Erik Max Francis]

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, []);

Why not just

	reduce(operator.add, srcList, [])

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