Converting a list to a set changes element order

Question

Recently I noticed that when I am converting a list to set the order of elements is changed and is sorted by character.

Consider this examp

Answer 1

Answering your first question, a set is a data structure optimized for set operations. Like a mathematical set, it does not enforce or maintain any particular order of the elements. The abstract concept of a set does not enforce order, so the implementation is not required to. When you create a set from a list, Python has the liberty to change the order of the elements for the needs of the internal implementation it uses for a set, which is able to perform set operations efficiently.