Bugl — Daily coding puzzles and drills

Python frozenset frozenset is an immutable version of a set. Like sets, it contains unique, unordered, unchangeable elements. Unlike sets, elements cannot be added or removed from a frozenset.

Creating a frozenset

Use the frozenset()

constructor to create a frozenset from any iterable.

Example

Create a frozenset and check its type:

x = frozenset({"apple", "banana", "cherry"})
print(x)
print(type(x))

Frozenset Methods

Being immutable means you cannot add or remove elements. However, frozensets support all non-mutating operations of sets.

Method

Shortcut

Description

Try it copy()

Returns a shallow copy

Try it » difference()

Returns a new frozenset with the difference

Try it » intersection() &

Returns a new frozenset with the intersection

Try it » isdisjoint()

Returns whether two frozensets have an intersection

Try it » issubset() <= / < Returns True if this frozenset is a (proper) subset of another Try it » issuperset() >= / > Returns True if this frozenset is a (proper) superset of another Try it » symmetric_difference() ^ Returns a new frozenset with the symmetric differences Try it » union() |

Returns a new frozenset containing the union

Try it »