frozenset
Create an immutable set from the items of an iterable.
Python 3.13
frozenset([iterable])Parameters
- iterableIterableoptional
- The items of the new set; without it, an empty set is created.
Return value
A new immutable set without duplicates.
Examples
Immutable set without duplicates
Python 3.13
print(frozenset([1, 2, 2, 3]))frozenset({1, 2, 3})Set as a dictionary key
Python 3.13
routes = {frozenset({'A', 'B'}): 120}
print(routes[frozenset({'B', 'A'})])120
Details
A frozenset cannot be changed after creation, but it can be a dictionary key or an item of another set.