Set is an unordered and unindexed collection of items in Python. Unordered means when we display the elements of a set, it will come out in a random order. Unindexed means, we cannot access the elements of a set using the indexes like we can do in list and tuples.

Why is set unordered?

Set is an ordered sequence of unique keys whereas unordered_set is a set in which key can be stored in any order, so unordered. Set is implemented as a balanced tree structure that is why it is possible to maintain order between the elements (by specific tree traversal).

Are sets in Python unordered?

A Set is an unordered collection data type that is iterable, mutable and has no duplicate elements. Since sets are unordered, we cannot access items using indexes like we do in lists. ...