Sets

Since sets are similar to dictionaries, they have a number of methods associated with them, which apply to both set and frozenset:

x not in s: This returns False if x exists in s; otherwise, it is True
isdisjoint(other): This returns True if the set has no elements in common with object other
issubset(other): This tests whether all elements in the set are also in other
issuperset(other): This tests whether all elements in other are also in set
union(*others): This returns a new set that includes elements from the original set and all other objects
intersection(*others): This returns a new set that only contains objects that are in common between the set and all other objects
difference(*others): This returns a new set that is only the elements that exist in the set, but are not in others
symmetric_different(other): This returns a new set of elements that are either in set or other, but not both
copy(): This returns a new set with a shallow copy of the set

The following are methods only available to set, but not to frozenset:

update(*others): This updates the set by adding elements from all others
intersection_update(*others): This updates the set by keeping only the elements that are in the set and others
difference_update(*others): This updates the set by keeping only the elements found in others
symmetric_difference_update(other): This updates the set with only the elements found in either set or other, but not common to both
add(elem): This adds elem to the set
remove(elem): This deletes elem from the set; it throws an exception if elem is not present
discard(elem): This deletes elem from the set if present
pop(): This removes elem from the set, if present, and returns its value; it throws an exception if the set contains no values
clear(): This deletes all elements from the set

Table of Contents for Sets