Python Set isdisjoint()

The isdisjoint() method returns True if two sets are disjoint sets. If not, it returns False.

Two sets are said to be disjoint sets if they have no common elements. For example:

A = {1, 5, 9, 0}
B = {2, 4, -5}

Here, sets A and B are disjoint sets.

The syntax of isdisjoint() is:

set_a.isdisjoint(set_b)

1. isdisjoint() Parameters

isdisjoint() method takes a single argument (a set).

You can also pass an iterable (list, tuple, dictionary, and string) to disjoint(). isdisjoint() method will automatically convert iterables to set and checks whether the sets are disjoint or not.

2. Return Value from isdisjoint()

isdisjoint() method returns

• True if two sets are disjoint sets (if set_a and set_b are disjoint sets in above syntax)
• False if two sets are not disjoint sets

3. Example 1: How isdisjoint() works?

A = {1, 2, 3, 4}
B = {5, 6, 7}
C = {4, 5, 6}

print('Are A and B disjoint?', A.isdisjoint(B))
print('Are A and C disjoint?', A.isdisjoint(C))

Output

Are A and B disjoint? True
Are A and C disjoint? False

4. Example 2: isdisjoint() with Other Iterables as arguments

A = {'a', 'b', 'c', 'd'}
B = ['b', 'e', 'f']
C = '5de4'
D ={1 : 'a', 2 : 'b'}
E ={'a' : 1, 'b' : 2}

print('Are A and B disjoint?', A.isdisjoint(B))
print('Are A and C disjoint?', A.isdisjoint(C))
print('Are A and D disjoint?', A.isdisjoint(D))
print('Are A and E disjoint?', A.isdisjoint(E))

Output

Are A and B disjoint? False
Are A and C disjoint? False
Are A and D disjoint? True
Are A and E disjoint? False