Python frozenset() function

The frozenset() function in Python is used to create frozenset. For example:

x = (32, 43, 53, 534)
y = frozenset(x)
print(y)

The output will be:

frozenset({32, 43, 53, 534})

Python frozenset() function syntax

The syntax of the frozenset() function in Python, is:

frozenset(iterable)

where iterable refers to an iterable object like a list, tuple, set, etc.

Python frozenset() function example

The program given below is an example of the frozenset() function in Python.

mylist = ["codes", "cracker", "python", "programming"]
fs = frozenset(mylist)
print(fs)

mydict = {"Day": "Sun", "Month": "Nov", "Year": "2021"}
fs = frozenset(mydict)
print(fs)

The screenshot below shows an example of the output from this Python program, which shows how the frozenset() function works:

Advantages of the frozenset() function in Python

• Immutability: An object that is returned by the frozenset() function is immutable, which means that it cannot be changed after being created. When you need to guarantee that the set of elements doesn't change, this can be helpful.
• Hashability: The frozenset() object can be used as a key in a dictionary or as an element in another set because it is immutable and hashable.
• Efficiency: Instead of first creating a new set and then converting it to a frozenset, the frozenset() function may be more effective. This is so that complete representations of objects or strings can be created directly from the input iterable, which is possible with the frozenset() function.

Disadvantages of the frozenset() function in Python

• Immutability: While it occasionally serves as a benefit, it can also work against you when you need to change the set of elements. Once a frozenset() object has been created, you are not able to add, remove, or change any of the set's elements.
• The frozenset() function only allows the creation of immutable sets of elements. The newly created frozenset object cannot be used to perform set operations like union, intersection, or difference.
• Memory requirements: Since frozenset() objects are immutable, the memory requirements for creating a new frozenset object with a large number of elements can be high.

Python Online Test