What is the advantage of using an immutable object of type frozenset in Python?

frozenset in Python is an immutable version of a set. Its advantages:

• Immutability: once created, a frozenset cannot be changed — elements cannot be added or removed. This is useful when you need to guarantee that the dataset remains constant.
• Hashability: unlike a regular set, a frozenset can be used as a key in dictionaries or as an element of a set because it is hashable.
• Safety and predictability: immutable objects are easier to use in multithreaded programs and when caching.

Example usage:

fs = frozenset([1, 2, 3])
print(fs)

# Can be used as a key in a dictionary
my_dict = {fs: "value"}
print(my_dict[fs])

Thus, frozenset is convenient when an immutable set of unique elements is needed with the ability to use it as a key.