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List:       python-list
Subject:    Re: map/filter/reduce/lambda opinions and background unscientific
From:       Paweł Sakowski <pawel () sakowski ! pl>
Date:       2005-07-07 15:08:31
Message-ID: dajghf$dit$1 () inews ! gazeta ! pl
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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@sakowski.pl>
-- 
http://mail.python.org/mailman/listinfo/python-list

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