union, intersection

• union

It contains all the elements contained in both sets. (A ⋃ B)

a={'red', 'green', 'blue'}
b=set(['red', 'yellow', 'orange'])
a_union_b=a.union(b)
print(a_union_b)

>>>
{'blue', 'green', 'red', 'yellow', 'orange'}

 

• intersection

It contains only the elements that are in both sets.

a_intersec_b=a.intersection(b)
print(a_intersec_b)

>>>
{'red'}