map/filter/reduce/lambda opinions and background unscientific mini-survey

[Paweł Sakowski]

Tom Anderson wrote:
> def flatten(ll):
>  return reduce(lambda a, l: a.extend(l), ll, [])
> 
> How would one do that as a list comp, by the way? I'm really not very good
> with them yet.

Not really a list-comprehension based solution, but I think what you want is

>>> ll=[[1,2],[3,4,5],[6]]
>>> sum(ll,[])
[1, 2, 3, 4, 5, 6]

-- 
 Paweł Sakowski <pawel at sakowski.pl>