add()	Adds elements to the collection.
clear()	Removes all elements from the collection.
copy()	Copy a collection.
difference()	Returns the difference set of multiple sets.
difference_update()	Removes an element from a collection that also exists in the specified collection.
discard()	Deletes the specified element of the collection.
intersection()	Returns the intersection of sets.
intersection_update()	Returns the intersection of sets.
isdisjoint()	Determines whether two collections contain the same element, if not returns True, otherwise returns False.
issubset()	Determines whether the specified collection is a subset of the method's argument collection.
issuperset()	Determines whether the method's set of arguments is a subset of the specified set.
pop()	Randomly removes elements.
remove()	Removes the specified element.
symmetric_difference()	Returns the set of elements that are not duplicated in the two collections.
symmetric_difference_update()	Removes an element from the current collection that is the same in another specified collection and inserts a different element from another specified collection into the current collection.
union()	Returns the union of two sets.
update()	Adds elements to the collection.
len()	Calculate the number of set elements.