Add and lookup

Add to a set and check membership.

Intersection and union

The intersection of two sets is the elements in both. The union is all elements in at least one set.

Intersection: A & B or A.intersection(B). Union: A | B or A.union(B).

Set difference: elements in A but not in B (A - B). Subset: if all of A's elements are in B, A is a subset of B.

These operations form the basis of set theory and are frequently used in data analysis.

Write set_contains(s, item). Return True if item in s, False otherwise. Print True with print(set_contains({1, 2, 3}, 2)).

Show example solution

def set_contains(s, item):
    # Contains
    return item in s
print(set_contains({1, 2, 3}, 2))

Intersection

The intersection of two sets is found with the ____ operator.

Show answer

The intersection of two sets is found with the & operator.