Function to remove elements from a list working, but Python Hangs :((

[Girish Sahani]

> I guess it's already the case with lst = [ e for e in lst if e in pairs ]
>
>
> In [1]: lst = (1,2,3,4)
>
> In [2]: pairs=(5,)
>
> In [3]: lst=[e for e in lst if e in pairs]
>
> In [4]: lst
> Out[4]: []
Yes its working. I realized that i was giving an input which didnt satisfy
the condition.
Now if you could please check out this new problem i'm facing,related to
this.In my code,l4 is a list of lists, and these lists contain such pairs.
e.g. l4 =
[[[4,2],[4,7],[4,10],[4,12],[9,2],[9,7],[9,10],[9,12],[11,2],[11,10]],[[1,2],[3,5],[7,8]]]
which is a list of 2 lists (having 13 pairs)
Now when l4 has 50 pairs, and i run the code, python just hangs, and i'm
quite sure its because of this. Is there any way to rectify this???



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