setattr(object, name, value) This is the counterpart of getattr(). The arguments are an object, a string and an arbitrary value. The string may name an existing attribute or a new attribute. The function assigns the value to the attribute, provided the object allows it. For example, setattr(x, 'foobar', 123) is equivalent to x.foobar = 123.

update(other, ...) set |= other | ... Update the set, adding elements from all others.

union(other, ...) set | other | ... Return a new set with elements from the set and all others.

symmetric_difference_update(other) set ^= other Update the set, keeping only elements found in either set, but not in both.

symmetric_difference(other) set ^ other Return a new set with elements in either the set or other but not both.

remove(elem) Remove element elem from the set. Raises KeyError if elem is not contained in the set.

pop() Remove and return an arbitrary element from the set. Raises KeyError if the set is empty.

issuperset(other) set >= other Test whether every element in other is in the set.

issubset(other) set <= other Test whether every element in the set is in other.

isdisjoint(other) Return True if the set has no elements in common with other. Sets are disjoint if and only if their intersection is the empty set.