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Frozenset
==================
mutable = পরিবর্তনশীল (changeable)
immutable = অপরিবর্তনশীল (unchangeable)
Frozenset is an immutable set. we can't add item and remove item from this set. It is like tuple.
A mutable set is not hashable and we can't be uses for dictionary keys. But Frozenset is hashable and we can be used for dictionary keys. We can define frozenset by frozenset() function.

Hashable means we can get hash value from immutable data . Such as we can get hash value from this Frozenset .
Example:
v = frozenset({1,2,3,4,5})
print(v)
Output: frozenset({1,2,3,4,5})
hash(v)
Output: -1578714465
[N.B.You can find more details about hash in Python docs]

Frozenset set is supported these methods
copy(), difference(), intersection(), isdisjoint(), issubset(), issuperset(), symmetric_difference() and union()

Example:
a = frozenset({1,2,3,4})
b = frozenset({3,4,5,6})

Now we can appy above methods. such as union() method
a | b or a.union(b)

Output: frozenset({1, 2, 3, 4, 5, 6, 7})

That's Frozenset .. :D


Source code: https://github.com/vubon/Python-Bangla