Comparing modified elements in Sets

[dabu11et at rock.com]

On Jul 9, 2:57 pm, ChrisEdge... at gmail.com wrote:
> I've got a set with contents like: [filename1.mp3, filename2.mp3,
> filename3.mp3, ...]
> I've got another set with contents like [filename1.ogg,
> filename3.ogg, ...]
> And another set with contents like [filename1, filename 2, ...]
>
> I'd like to be able to compare set 1 with set 2 and have it match
> filename1 and filename3, or compare set 1 with 3 and get back
> filename1, filename2.  etc.
>
> Is there a way for me to do this inside the compare function, rather
> than having to make duplicate copies of each set?

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