Set Operations & Methods (Python)

A set is an unordered collection of zero or more immutable Python data objects.

>>> {3, 6, "cat", False}

Operations on a Set

1. Membership — in — set membership.
2. Length — len — returns the cardinality of the set.
3. | — aset | otherset — returns a new set with all elements from both sets.
4. & — aset & otherset — returns a new set with only the elements common to both sets.
5. - — aset - otherset — returns a new set with all items from the first set not in the second.
6. <= — aset <= otherset — asks whether all elements of the first set are in the second.

Set Methods

1. union — aset.union(otherset) — returns a new set with all elements from both sets.
2. intersection — aset.intersection(otherset) — returns a new set with only the elements common to both sets.
3. difference — aset.difference(otherset) — returns a new set with all items from the first set not in the second.
4. issubset — aset.issubset(otherset) — asks whether all elements of one set are in the other.
5. add — aset.add(item) — adds item to the set.
6. remove — aset.remove(item) — removes item from the set.
7. pop — aset.pop() — removes an arbitrary element from the set.
8. clear — aset.clear() — removes all elements from the set.