ExampleEdit & Run
#Use the builtin frozenset function
empty_frozenset = frozenset()
print(empty_frozenset)

f = frozenset([1, 2, 3, 4])
print(f)
 Visualize 
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Output:
frozenset()
frozenset({1, 2, 3, 4})
[Finished in 0.010356514248996973s]

The frozenset() function is used to create an immutable frozenset object.  A frozenset is an unordered collection of unique elements, similar to a set, but it is immutable, meaning its elements cannot be modified once it is created.

The frozenset() function takes an iterable as its argument and returns a new frozenset object containing the elements from the iterable. If no argument is provided, an empty frozenset is returned.

Syntax: 
frozenset(iterable = None)
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iterable The iterable argument to be casted into a frozenset. If it is not given, an empty frozenset will be returned.
Parameters:

If no argument is given, the function returns an empty frozenset. Otherwise, the function returns a frozenset with all the unique elements from the given iterable.

ExampleEdit & Run
empty_frozen_set = frozenset()
print(empty_frozen_set)

numbers = [1, 2, 3, 4, 5]
frozen_numbers = frozenset(numbers)
print(frozen_numbers)

string = "hello"
frozen_string = frozenset(string)
print(frozen_string)
 Visualize 
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Output:
frozenset()
frozenset({1, 2, 3, 4, 5})
frozenset({'h', 'e', 'l', 'o'})
[Finished in 0.009937882423400879s]

Frozensets are especially useful when you need an immutable set-like object that can be used as a dictionary key or as an element in another set. Their immutable nature also makes them more efficient than 'normal' sets if we do not intend to modify the resulting set.