union
intersection
difference
symmetric_difference(other)
set ^ other

    Return a new set with elements in either the set or other but not both


issubset(other)
set <= other

    Test whether every element in the set is in other.

set < other

    Test whether the set is a proper subset of other, that is, set <= other and set != other.

issuperset(other)
set >= other

    Test whether every element in other is in the set.

set > other

    Test whether the set is a proper superset of other, that is, set >= other and set != other.
