ordered sets operations on lists..

[bonono at gmail.com]

Amit Khemka wrote:
> Hello, Is there a *direct* way of doing set operations on lists which
> preserve the order of the input lists ?
> For Ex.  l1 = [1, 5, 3, 2, 4, 7]
>             l2 =  [3, 5,  10]
>
> and (l1 intersect l2)  returns [5, 3]     .... (and (l2 intersect l1)
> returns [3, 5])
>
what do you mean by "direct" way ? ugly(some said) one liner ?

filter(set(l1).intersection(set(l2)).__contains__, l1)
filter(set(l1).intersection(set(l2)).__contains__, l2)