Python frozenset.difference Usage Detailed Explanation and Examples

frozenset.difference returns the difference between two frozensets, that is, it returns the elements in the caller set that are not in the argument set. The syntax of this method is as follows:

frozenset.difference(*other)

*other indicates that it accepts multiple arguments, each of which is a frozenset set.

Below are three examples:

Example 1:

set1 = frozenset([1, 2, 3, 4, 5])
set2 = frozenset([4, 5, 6, 7, 8])
result = set1.difference(set2)
print(result) # Output: frozenset({1, 2, 3})

In this example, set1 and set2 are two frozensets. By calling the set1.difference(set2) method, the elements in set1 that are not in set2 are returned.

Example 2:

set1 = frozenset([1, 2, 3, 4, 5])
set2 = frozenset([1, 2, 3, 4, 5])
result = set1.difference(set2)
print(result) # Output: frozenset()

In this example, set1 and set2 are identical frozensets, and calling set1.difference(set2) returns an empty set because the two sets have no difference.

Example 3:

set1 = frozenset([1, 2, 3])
result = set1.difference([2, 3, 4])
print(result) # Output: frozenset({1})

In this example, set1 is a frozenset set, and the argument is a list. Calling set1.difference([2, 3, 4]) returns the elements in set1 that are not in the argument list. Note that the argument can be any iterable object.

Summary: The frozenset.difference method returns the difference between the caller set and the argument set, that is, it returns the elements that are in the caller set but not in the argument set.