[Tutor] __and_ and and_

[Bryan Hann]

Emile van Sebille wrote:

> You can then write
> c = a + b    # to show the union
> --- or ---
> c = a - b    # for the intersection

Yes, though I would strongly recommend a * b for intersection, 
and reserve a - b for non-commutative set (or list) difference.

    >>>a=mySet([1,2,3,4,5])
    >>>b=mySet([3,4,5,6,7])
    >>>print a*b, a-b, b-a
    [3,4,5] [1,2] [6,7]

(assuming appropriate definition of mySet.__repr__ of course!)

--Bryan Hann