- It is exactly the same as set except that it is immutable.
- Hence we cannot use add or remove functions.
>>> s={10,20,30,40}
>>> fs=frozenset(s)
>>> type(fs)
<class 'frozenset'>
>>> fs
frozenset({40, 10, 20, 30})
>>> for i in fs:print(i)
40
10
20
30
>>> fs.add(70)
AttributeError: 'frozenset' object has no attribute 'add'
>>> fs.remove(10)
AttributeError: 'frozenset' object has no attribute 'remove'