Why this apparent assymetry in set operations?

Skip Montanaro skip at pobox.com
Tue Jan 15 17:05:43 CET 2008

> If the RHS is a set then it works OK:

Yup, I understand that.  Would be kind of bad if it didn't. ;-)

> It could be modifies to handle any 
> iterable on the RHS.

That's my question.  Why does it work in one place but not everywhere?


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