Python: Sets, Union, Intersection

By Xah Lee. Date: . Last updated: .

This page shows you how to do {union, intersection, difference} on sets.

Difference of Sets

set1 = {1, 2, 3}
set2 = {1, 4, 5}

print((set2 - set1) == {4, 5})
print((set1 - set2) == {2, 3})

Union of Sets

set1 = {1, 2, 3}
set2 = {1, 4, 5}
print(set1.union(set2) == {1, 2, 3, 4, 5})

Intersection of Sets

set1 = {1, 2, 3}
set2 = {1, 4, 5}
print(set1.intersection(set2) == {1})

Python, Data Structure