Python built-in Method - frozenset()

The frozenset() method in Python returns an immutable frozenset object which is similar to a set, but is immutable, meaning that its contents cannot be changed once it is created.

The syntax for frozenset() is as follows:

frozen_set = frozenset(iterable)

Here, iterable is any iterable object like a list, tuple, set, or string. The frozenset() method takes an iterable as an argument and returns a frozenset object containing the unique elements from the iterable.

For example:

>>> s = set([1, 2, 3])
>>> fs = frozenset(s)
>>> print(fs)
frozenset({1, 2, 3})

In the example above, we create a set s containing the elements 1, 2, and 3. We then pass s as an argument to the frozenset() method to create an immutable frozenset object fs. The print() function is used to display the contents of fs.

Since a frozenset is immutable, it can be used as a key in a dictionary or as an element in another set, whereas a regular set cannot.

Note that since frozenset objects are immutable, methods that modify a set such as add(), remove(), or clear() are not available for frozenset.