Chris Rebert clp2 at
Thu Jun 11 04:05:06 CEST 2009

On Wed, Jun 10, 2009 at 5:53 PM, Mensanator<mensanator at> wrote:
> On Jun 10, 5:24 pm, David Wilson <d... at> wrote:
>> Hi,
>> During a fun coding session yesterday, I came across a problem that I
>> thought was already solved by itertools, but on investigation it seems
>> it isn't.
>> The problem is simple: given one or more ordered sequences, return
>> only the objects that appear in each sequence, without reading the
>> whole set into memory. This is basically an SQL many-many join.
> Why not use SQL?

Agreed. I seem to recall the last person asking for such a function
wanted to use it to combine SQL results.


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