Last Updated : 11 Jul, 2025
Python Method creates an immutable Set object from an iterable. It is a built-in Python function. As it is a set object, therefore, we cannot have duplicate values in the frozenset.
Example
In this example, we are creating a frozen set with the list in Python.
Python
animals = frozenset(["cat", "dog", "lion"])
print("cat" in animals)
print("elephant" in animals)
Output
TruePython frozenset() Syntax
False
frozenset() in Python Examples Working of Python frozenset()Syntax : frozenset(iterable_object_name)
Parameter : iterable_object_name
- This function accepts iterable object as input parameter.
Return : Returns an equivalent frozenset object.
In this example, we are showing how to create a frozen set in Python and we are showing that frozen set objects are immutable and can not be modified after the creation.
Python
fruits = frozenset(["apple", "banana", "orange"])
print(fruits)
fruits.add("cherry")
print(fruits)
Output
frozenset({'orange', 'apple', 'banana'})
ERROR!
Traceback (most recent call last):
File "<main.py>", line 3, in <module>
AttributeError: 'frozenset' object has no attribute 'add'Python frozenset for Tuple
If no parameters are passed to frozenset() function, then it returns an empty frozenset type object in Python.
Python
# passing an empty tuple
nu = ()
# converting tuple to frozenset
fnum = frozenset(nu)
# printing empty frozenset object
print("frozenset Object is : ", fnum)
Output
frozenset Object is : frozenset()Python frozenset for List
Here as a parameter a list is passed and now its frozen set object is returned.
Python
l = ["Geeks", "for", "Geeks"]
# converting list to frozenset
fnum = frozenset(l)
# printing empty frozenset object
print("frozenset Object is : ", fnum)
Output
frozenset Object is : frozenset({'Geeks', 'for'})
frozenset in Python for Dictionary
Since frozen set objects are immutable, they are mainly used as keys in dictionary or elements of other sets. The below example explains it clearly.
Python
# creating a dictionary
Student = {"name": "Ankit", "age": 21, "sex": "Male",
"college": "MNNIT Allahabad", "address": "Allahabad"}
# making keys of dictionary as frozenset
key = frozenset(Student)
# printing dict keys as frozenset
print('The frozen set is:', key)
Output
The frozen set is: frozenset({'address', 'name', 'age', 'sex', 'college'})
Exceptions while using the frozenset() method in Python
If by mistake we want to change the frozen set object, then it throws a TypeError
Python
# creating a list
favourite_subject = ["OS", "DBMS", "Algo"]
# creating a frozenset
f_subject = frozenset(favourite_subject)
# below line will generate error
f_subject[1] = "Networking"
Output
TypeError Traceback (most recent call last)Frozenset operations
Input In [13], in <cell line: 8>()
5 f_subject = frozenset(favourite_subject)
7 # below line will generate error
----> 8 f_subject[1] = "Networking"
TypeError: 'frozenset' object does not support item assignment
Frozen sets are immutable sets that allow you to perform various set operations such as union, intersection, difference, and symmetric difference.
Python
# initialize A and B
A = frozenset([1, 2, 3, 4])
B = frozenset([3, 4, 5, 6])
# copying a frozenset
C = A.copy()
print(C)
# union
union_set = A.union(B)
print(union_set)
# intersection
intersection_set = A.intersection(B)
print(intersection_set)
difference_set = A.difference(B)
print(difference_set)
# symmetric_difference
symmetric_difference_set = A.symmetric_difference(B)
print(symmetric_difference_set)
Output
frozenset({1, 2, 3, 4})
frozenset({1, 2, 3, 4, 5, 6})
frozenset({3, 4})
frozenset({1, 2})
frozenset({1, 2, 5, 6})
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