I tested it out. Version without set() is much much slower than any other solution pasted here.

This should not be best practices.

Time of execution for long text of this version: 0.27908778190612793
time of exection for long text where you iterate over set: 0.0005300045013427734

@noweare

yes, it is one of the greatest features of this site

CPU go brrrrrrrr

great job.

This solution is very inefficient, being O(n^2), when it easily could have been made O(n)
Not every one-liner is clever or best practice.

Tried using this syntax for something else using elifs, didn't realise multiple elses could be chained like this until now.

@sztssp

Maybe perhaps it won't be for a larger data! (like an entire paragraph)!!! Would be a good experiment to test it!

Could anyone explain why this is O(n2) instead of O(n) please?

Me too, i think i learn more by others solutions

smart

That is not a requirement though. Neither by description, nor by test.
Also insertion-order preservation in dictionaries depends on the python version.