What's the difference between fronzensets/sets and what are their advantages/disadvantages?
What's the difference between frozensets and sets?
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jsbueno
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frozensets are frozen! :-D
Joke apart, the most important characteristic is that they are hashable, and therefore, can be used as dictionary keys!
So, they allow for an incredible thing in Python: dictionaries that can have multiple strings as a single key, no matter the order of those strings.
The objective difference is that once created, a frozenset is not mutable - no new elements can be added and nothing can be removed.
Otherwise, all set operations will work for them (those that would not cause it to be changed, of course) - and, unfortunately, as frozensets have no special syntax for their creation, they are relatively little known by developers.
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Frozenset is immutable. Once created you cannot add/remove elements from it. This means that they can be used as keys in dictionaries etc. and in any other place where you would like an object to be hashable. A common practise is to be working with a set while constructing it, and if at any point you know it will no longer change - freeze it for a guarantee of it really not happening.