Understanding the set() function

Question

In python, set() is an unordered collection with no duplicate elements. However, I am not able to understand how it generates the output.

For example,

Answer 1

As +Volatility and yourself pointed out, sets are unordered. If you need the elements to be in order, just call sorted on the set:

>>> y = [1, 1, 6, 6, 6, 6, 6, 8, 8]
>>> sorted(set(y))
[1, 6, 8]