Is it worth using hashing for objects that cannot be changed in Python?

Yes, for immutable objects in Python, hashing is justified and useful. Such objects can be used as dictionary keys or set elements because their hash value does not change during the object's lifetime, ensuring correct operation of hash tables. For example, tuples, strings, and numbers are immutable and hashable. If an object is mutable, its hash may change, leading to errors when used in dictionaries or sets.