improving a huge double-for cycle

[Tino Wildenhain]

Hi,

Terry Reedy wrote:
...
> Yes, after figuring out what to do from the original post, I saw yours 
> and then Pruebono's and decided that since two people had submitted the 
> jackpot algorithm, I need not say more.  I will say this: this solution 
> amounts to finding equivalence classes (the sets of items with a given 
> 'key') and then finding the classes (sets) with more than one member. 
> Defaultdict is great for this.

I must say mine works with at least similar performance. Maybe its a
timezone issue but I also provided a simple test to my solution.

Also I never saw a list where the threading often goes wrong like
this here - is there any special setup or is it just peoples MUA
which screws up?

T.
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