12.06.13 09:32, Phil Connell написав(ла):
On 12 Jun 2013 01:36, "Roy Smith" <r...@panix.com <mailto:r...@panix.com>>
wrote:
> Well, continuing down this somewhat bizarre path:
>
> new_songs, old_songs = [], []
> itertools.takewhile(
> lambda x: True,
> (new_songs if s.is_new() else old_songs).append(s) for s in songs)
> )
>
> I'm not sure I got the syntax exactly right, but the idea is anything
> that will iterate over a generator expression. That at least gets rid
> of the memory requirement to hold the throw-away list :-)
You could equivalently pass the generator to deque() with maxlen=0 -
this consumes the iterator with constant memory usage.
any((new_songs if s.is_new() else old_songs).append(s) for s in songs)
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